Articles | Volume 20, issue 9
https://doi.org/10.5194/bg-20-1725-2023
© Author(s) 2023. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/bg-20-1725-2023
© Author(s) 2023. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Research article
| 
09 May 2023
Research article |
| 09 May 2023
| 09 May 2023
Fossil coccolith morphological attributes as a new proxy for deep ocean carbonate chemistry
Amanda Gerotto
CORRESPONDING AUTHOR
Oceanographic Institute, University of São Paulo, São Paulo,
Brazil
Center for Marine Studies, Federal University of Paraná, Pontal do
Paraná, Brazil
Geological Institute, ETH Zurich, Zurich, Switzerland
Renata Hanae Nagai
Center for Marine Studies, Federal University of Paraná, Pontal do
Paraná, Brazil
Heather M. Stoll
Geological Institute, ETH Zurich, Zurich, Switzerland
Rubens César Lopes Figueira
Oceanographic Institute, University of São Paulo, São Paulo,
Brazil
Chuanlian Liu
State Key Laboratory of Marine Geology, Tongji
University, Shanghai, China
Iván Hernández-Almeida
Geological Institute, ETH Zurich, Zurich, Switzerland
Related authors
No articles found.
Judit Torner, Isabel Cacho, Heather Stoll, Ana Moreno, Joan O. Grimalt, Francisco J. Sierro, Joan J. Fornós, Hai Cheng, and R. Lawrence Edwards
Clim. Past, 21, 465–487, https://doi.org/10.5194/cp-21-465-2025, https://doi.org/10.5194/cp-21-465-2025, 2025
Short summary
Short summary
We offer a clearer view of the timing of three relevant past glacial terminations. By analyzing the climatic signal recorded in stalagmite and linking it with marine records, we revealed differences in the intensity and duration of the ice melting associated with these three key deglaciations. This study shows that some deglaciations began earlier than previously thought; this improves our understanding of natural climate processes, helping us to contextualize current climate change.
José Guitián, Samuel R. Phelps, Reto S. Wijker, Pratigya J. Polissar, Laura Arnold, and Heather M. Stoll
Clim. Past Discuss., https://doi.org/10.5194/cp-2024-65, https://doi.org/10.5194/cp-2024-65, 2024
Preprint under review for CP
Short summary
Short summary
We reconstructed from sediments of different ocean sites phytoplankton carbon isotopic fractionation (εp), mainly linked to CO2 variations, during the Oligocene to early Miocene. Records confirm long-term trends but show contrasting relationships with the sea surface temperatures evolution. We evaluate the role of non-CO2 physiological factors such as temperature and nutrients at each site εp, highlighting the complexity of interpreting climate dynamics and CO2 reconstructions.
Alexander J. Clark, Ismael Torres-Romero, Madalina Jaggi, Stefano M. Bernasconi, and Heather M. Stoll
Clim. Past, 20, 2081–2101, https://doi.org/10.5194/cp-20-2081-2024, https://doi.org/10.5194/cp-20-2081-2024, 2024
Short summary
Short summary
Coccoliths are abundant in sediments across the world’s oceans, yet it is difficult to apply traditional carbon or oxygen isotope methodologies for temperature reconstructions. We show that our coccolith clumped isotope temperature calibration with well-constrained temperatures systematically differs from inorganic carbonate calibrations. We suggest the use of our well-constrained calibration for future coccolith carbonate temperature reconstructions.
Nikita Kaushal, Carlos Perez-Mejias, and Heather M. Stoll
Clim. Past Discuss., https://doi.org/10.5194/cp-2024-37, https://doi.org/10.5194/cp-2024-37, 2024
Revised manuscript under review for CP
Short summary
Short summary
Terminations are large magnitude rapid events triggered in the North Atlantic region that manifest across the global climate system. They provide key examples of climatic teleconnections and dynamics. In this study, we use the SISAL global speleothem database and find that there are sufficient climatic records from key locations to make speleothems a valuable archive for studying Terminations and provide instances for more targeted work on speleothem research.
Yuji Kato, Iván Hernández-Almeida, and Lara F. Pérez
J. Micropalaeontol., 43, 93–119, https://doi.org/10.5194/jm-43-93-2024, https://doi.org/10.5194/jm-43-93-2024, 2024
Short summary
Short summary
In this study, we propose an age framework for an interval of 4.8–3.1 million years ago, using fossil records of marine plankton such as diatoms and radiolarians derived from a sediment core collected in the Southern Ocean. Specifically, a total of 19 bioevents (i.e., extinction/appearance events of selected age marker species) were detected, and their precise ages were calculated. The updated biostratigraphy will contribute to future paleoceanographic work in the Southern Ocean.
Nikita Kaushal, Franziska A. Lechleitner, Micah Wilhelm, Khalil Azennoud, Janica C. Bühler, Kerstin Braun, Yassine Ait Brahim, Andy Baker, Yuval Burstyn, Laia Comas-Bru, Jens Fohlmeister, Yonaton Goldsmith, Sandy P. Harrison, István G. Hatvani, Kira Rehfeld, Magdalena Ritzau, Vanessa Skiba, Heather M. Stoll, József G. Szűcs, Péter Tanos, Pauline C. Treble, Vitor Azevedo, Jonathan L. Baker, Andrea Borsato, Sakonvan Chawchai, Andrea Columbu, Laura Endres, Jun Hu, Zoltán Kern, Alena Kimbrough, Koray Koç, Monika Markowska, Belen Martrat, Syed Masood Ahmad, Carole Nehme, Valdir Felipe Novello, Carlos Pérez-Mejías, Jiaoyang Ruan, Natasha Sekhon, Nitesh Sinha, Carol V. Tadros, Benjamin H. Tiger, Sophie Warken, Annabel Wolf, Haiwei Zhang, and SISAL Working Group members
Earth Syst. Sci. Data, 16, 1933–1963, https://doi.org/10.5194/essd-16-1933-2024, https://doi.org/10.5194/essd-16-1933-2024, 2024
Short summary
Short summary
Speleothems are a popular, multi-proxy climate archive that provide regional to global insights into past hydroclimate trends with precise chronologies. We present an update to the SISAL (Speleothem Isotopes
Synthesis and AnaLysis) database, SISALv3, which, for the first time, contains speleothem trace element records, in addition to an update to the stable isotope records available in previous versions of the database, cumulatively providing data from 365 globally distributed sites.
Synthesis and AnaLysis) database, SISALv3, which, for the first time, contains speleothem trace element records, in addition to an update to the stable isotope records available in previous versions of the database, cumulatively providing data from 365 globally distributed sites.
Miguel Bartolomé, Ana Moreno, Carlos Sancho, Isabel Cacho, Heather Stoll, Negar Haghipour, Ánchel Belmonte, Christoph Spötl, John Hellstrom, R. Lawrence Edwards, and Hai Cheng
Clim. Past, 20, 467–494, https://doi.org/10.5194/cp-20-467-2024, https://doi.org/10.5194/cp-20-467-2024, 2024
Short summary
Short summary
Reconstructing past temperatures at regional scales during the Common Era is necessary to place the current warming in the context of natural climate variability. We present a climate reconstruction based on eight stalagmites from four caves in the Pyrenees, NE Spain. These stalagmites were dated precisely and analysed for their oxygen isotopes, which appear dominated by temperature changes. Solar variability and major volcanic eruptions are the two main drivers of observed climate variability.
Heather M. Stoll, Leopoldo D. Pena, Ivan Hernandez-Almeida, José Guitián, Thomas Tanner, and Heiko Pälike
Clim. Past, 20, 25–36, https://doi.org/10.5194/cp-20-25-2024, https://doi.org/10.5194/cp-20-25-2024, 2024
Short summary
Short summary
The Oligocene and early Miocene periods featured dynamic glacial cycles on Antarctica. In this paper, we use Sr isotopes in marine carbonate sediments to document a change in the location and intensity of continental weathering during short periods of very intense Antarctic glaciation. Potentially, the weathering intensity of old continental rocks on Antarctica was reduced during glaciation. We also show improved age models for correlation of Southern Ocean and North Atlantic sediments.
Heather M. Stoll, Chris Day, Franziska Lechleitner, Oliver Kost, Laura Endres, Jakub Sliwinski, Carlos Pérez-Mejías, Hai Cheng, and Denis Scholz
Clim. Past, 19, 2423–2444, https://doi.org/10.5194/cp-19-2423-2023, https://doi.org/10.5194/cp-19-2423-2023, 2023
Short summary
Short summary
Stalagmites formed in caves provide valuable information about past changes in climate and vegetation conditions. In this contribution, we present a new method to better estimate past changes in soil and vegetation productivity using carbon isotopes and trace elements measured in stalagmites. Applying this method to other stalagmites should provide a better indication of past vegetation feedbacks to climate change.
Oliver Kost, Saúl González-Lemos, Laura Rodríguez-Rodríguez, Jakub Sliwinski, Laura Endres, Negar Haghipour, and Heather Stoll
Hydrol. Earth Syst. Sci., 27, 2227–2255, https://doi.org/10.5194/hess-27-2227-2023, https://doi.org/10.5194/hess-27-2227-2023, 2023
Short summary
Short summary
Cave monitoring studies including cave drip water are unique opportunities to sample water which has percolated through the soil and rock. The change in drip water chemistry is resolved over the course of 16 months, inferring seasonal and hydrological variations in soil and karst processes at the water–air and water–rock interface. Such data sets improve the understanding of hydrological and hydrochemical processes and ultimately advance the interpretation of geochemical stalagmite records.
Paula Diz, Víctor González-Guitián, Rita González-Villanueva, Aida Ovejero, and Iván Hernández-Almeida
Earth Syst. Sci. Data, 15, 697–722, https://doi.org/10.5194/essd-15-697-2023, https://doi.org/10.5194/essd-15-697-2023, 2023
Short summary
Short summary
Benthic foraminifera are key components of the ocean benthos and marine sediments. Determining their geographic distribution is highly relevant for improving our understanding of the recent and past ocean benthic ecosystem and establishing adequate conservation strategies. Here, we contribute to this knowledge by generating an open-access database of previously documented quantitative data of benthic foraminifera species from surface sediments of the eastern Pacific (BENFEP).
Jessica G. M. Crumpton-Banks, Thomas Tanner, Ivan Hernández Almeida, James W. B. Rae, and Heather Stoll
Biogeosciences, 19, 5633–5644, https://doi.org/10.5194/bg-19-5633-2022, https://doi.org/10.5194/bg-19-5633-2022, 2022
Short summary
Short summary
Past ocean carbon is reconstructed using proxies, but it is unknown whether preparing ocean sediment for one proxy might damage the data given by another. We have tested whether the extraction of an organic proxy archive from sediment samples impacts the geochemistry of tiny shells also within the sediment. We find no difference in shell geochemistry between samples which come from treated and untreated sediment. This will help us to maximize scientific return from valuable sediment samples.
José Guitián, Miguel Ángel Fuertes, José-Abel Flores, Iván Hernández-Almeida, and Heather Stoll
Biogeosciences, 19, 5007–5019, https://doi.org/10.5194/bg-19-5007-2022, https://doi.org/10.5194/bg-19-5007-2022, 2022
Short summary
Short summary
The effect of environmental conditions on the degree of calcification of marine phytoplankton remains unclear. This study implements a new microscopic approach to quantify the calcification of ancient coccolithophores, using North Atlantic sediments. Results show significant differences in the thickness and shape factor of coccoliths for samples with minimum dissolution, providing the first evaluation of phytoplankton physiology adaptation to million-year-scale variable environmental conditions.
Nele Manon Vollmar, Karl-Heinz Baumann, Mariem Saavedra-Pellitero, and Iván Hernández-Almeida
Biogeosciences, 19, 585–612, https://doi.org/10.5194/bg-19-585-2022, https://doi.org/10.5194/bg-19-585-2022, 2022
Short summary
Short summary
We studied recent (sub-)fossil remains of a type of algae (coccolithophores) off southernmost Chile and across the Drake Passage, adding to the scarce knowledge that exists in the Southern Ocean, a rapidly changing environment. We found that those can be used to reconstruct the surface ocean conditions in the north but not in the south. We also found variations in shape in the dominant species Emiliania huxleyi depending on the location, indicating subtle adaptations to environmental conditions.
Franziska A. Lechleitner, Christopher C. Day, Oliver Kost, Micah Wilhelm, Negar Haghipour, Gideon M. Henderson, and Heather M. Stoll
Clim. Past, 17, 1903–1918, https://doi.org/10.5194/cp-17-1903-2021, https://doi.org/10.5194/cp-17-1903-2021, 2021
Short summary
Short summary
Soil respiration is a critical but poorly constrained component of the global carbon cycle. We analyse the effect of changing soil respiration rates on the stable carbon isotope ratio of speleothems from northern Spain covering the last deglaciation. Using geochemical analysis and forward modelling we quantify the processes affecting speleothem stable carbon isotope ratios and extract a signature of increasing soil respiration synchronous with deglacial warming.
Michel Michaelovitch de Mahiques, Roberto Violante, Paula Franco-Fraguas, Leticia Burone, Cesar Barbedo Rocha, Leonardo Ortega, Rosangela Felicio dos Santos, Bianca Sung Mi Kim, Rubens Cesar Lopes Figueira, and Marcia Caruso Bícego
Ocean Sci., 17, 1213–1229, https://doi.org/10.5194/os-17-1213-2021, https://doi.org/10.5194/os-17-1213-2021, 2021
Short summary
Short summary
In this work we used a concept called geochemical fingerprinting, with isotopes of neodymium and lead as tools to recognize the main sources and the physical processes responsible for the transport and deposition of sediments on a large area of the South Atlantic margin. Distinct sources, such as Antarctica, the Andean Cordillera, the Río de la Plata basin, and old rocks from the Brazilian shield, are identified.
Ana Moreno, Miguel Iglesias, Cesar Azorin-Molina, Carlos Pérez-Mejías, Miguel Bartolomé, Carlos Sancho, Heather Stoll, Isabel Cacho, Jaime Frigola, Cinta Osácar, Arsenio Muñoz, Antonio Delgado-Huertas, Ileana Bladé, and Françoise Vimeux
Atmos. Chem. Phys., 21, 10159–10177, https://doi.org/10.5194/acp-21-10159-2021, https://doi.org/10.5194/acp-21-10159-2021, 2021
Short summary
Short summary
We present a large and unique dataset of the rainfall isotopic composition at seven sites from northern Iberia to characterize their variability at daily and monthly timescales and to assess the role of climate and geographic factors in the modulation of δ18O values. We found that the origin, moisture uptake along the trajectory and type of precipitation play a key role. These results will help to improve the interpretation of δ18O paleorecords from lacustrine carbonates or speleothems.
Hongrui Zhang, Chuanlian Liu, Luz María Mejía, and Heather Stoll
Biogeosciences, 18, 1909–1916, https://doi.org/10.5194/bg-18-1909-2021, https://doi.org/10.5194/bg-18-1909-2021, 2021
Catarina Cavaleiro, Antje H. L. Voelker, Heather Stoll, Karl-Heinz Baumann, and Michal Kucera
Clim. Past, 16, 2017–2037, https://doi.org/10.5194/cp-16-2017-2020, https://doi.org/10.5194/cp-16-2017-2020, 2020
Leticia G. Luz, Thiago P. Santos, Timothy I. Eglinton, Daniel Montluçon, Blanca Ausin, Negar Haghipour, Silvia M. Sousa, Renata H. Nagai, and Renato S. Carreira
Clim. Past, 16, 1245–1261, https://doi.org/10.5194/cp-16-1245-2020, https://doi.org/10.5194/cp-16-1245-2020, 2020
Short summary
Short summary
Two sediment cores retrieved from the SE Brazilian continental margin were studied using multiple organic (alkenones) and inorganic (oxygen isotopes in carbonate shells and water) proxies to reconstruct the sea surface temperature (SST) over the last 50 000 years. The findings indicate the formation of strong thermal gradients in the region during the last climate transition, a feature that may become more frequent in the future scenario of global water circulation changes.
Michel Michaelovitch de Mahiques, Javier Alcántara-Carrió, Francisco José Lobo, Uri Schattner, Rosangela Felício dos Santos, Samara Cazzoli y Goya, Raissa Basti Ramos, José Gustavo Natorf de Abreu, Luiz Antonio Pereira de Souza, Rubens Cesar Lopes Figueira, and Marcia Caruso Bícego
Solid Earth Discuss., https://doi.org/10.5194/se-2018-140, https://doi.org/10.5194/se-2018-140, 2019
Publication in SE not foreseen
Short summary
Short summary
This paper is a contribution to the knowledge of the geological processes on the SW Atlantic. We tried to integrate data from different time-scales, such as the geological evolution (millions of years) to the hydrodynamic processes (days to years). The results allowed us to recognize the importance of the geological inheritance to the present morphology of submerged areas.
Hongrui Zhang, Heather Stoll, Clara Bolton, Xiaobo Jin, and Chuanlian Liu
Biogeosciences, 15, 4759–4775, https://doi.org/10.5194/bg-15-4759-2018, https://doi.org/10.5194/bg-15-4759-2018, 2018
Short summary
Short summary
The sinking speeds of coccoliths are relevant for laboratory methods to separate coccoliths for geochemical analysis. However, in the absence of estimates of coccolith settling velocity, previous implementations have depended mainly on time-consuming method development by trial and error. In this study, the sinking velocities of cocooliths were carefully measured for the first time. We also provide an estimation of coccolith sinking velocity by shape, which will make coccolith separation easier.
Saúl González-Lemos, José Guitián, Miguel-Ángel Fuertes, José-Abel Flores, and Heather M. Stoll
Biogeosciences, 15, 1079–1091, https://doi.org/10.5194/bg-15-1079-2018, https://doi.org/10.5194/bg-15-1079-2018, 2018
Short summary
Short summary
Changes in atmospheric carbon dioxide affect ocean chemistry and the ability of marine organisms to manufacture shells from calcium carbonate. We describe a technique to obtain more reproducible measurements of the thickness of calcium carbonate shells made by microscopic marine algae called coccolithophores, which will allow researchers to compare how the shell thickness responds to variations in ocean chemistry in the past and present.
Michel Michaelovitch de Mahiques, Till Jens Jörg Hanebuth, Renata Hanae Nagai, Marcia Caruso Bícego, Rubens Cesar Lopes Figueira, Silvia Helena Mello Sousa, Leticia Burone, Paula Franco-Fraguas, Satie Taniguchi, Alexandre Barbosa Salaroli, Gilberto Pereira Dias, Denise Menezes Prates, and Maria Eugenia Fernandes Freitas
Ocean Sci., 13, 209–222, https://doi.org/10.5194/os-13-209-2017, https://doi.org/10.5194/os-13-209-2017, 2017
Short summary
Short summary
In this paper we used sediment samples from the shelf and upper/middle slope off south-eastern Brazil in order to recognise the inorganic and organic signatures of the main current systems acting in the area. It was possible to identify the extension of the contribution of terrigenous sediments from the adjacent continent as well as to recognise the different geochemical signatures related to the Brazil Current, Intermediate Western Boundary Current and Deep Western Boundary Current.
Xiaobo Jin, Chuanlian Liu, Alex J. Poulton, Minhan Dai, and Xianghui Guo
Biogeosciences, 13, 4843–4861, https://doi.org/10.5194/bg-13-4843-2016, https://doi.org/10.5194/bg-13-4843-2016, 2016
Short summary
Short summary
The vertical structure of the coccolithophore community in the water column was controlled by trophic conditions, which were regulated by mesoscale eddies across the South China Sea basin. Three key species (Emiliania huxleyi, Gephyrocapsa oceanica, Florisphaera profunda) contributed roughly half of the surface ocean coccolith-calcite concentrations. E. huxleyi coccolith length is influenced by light and nutrients through the regulation of growth rates.
B. Ausín, I. Hernández-Almeida, J.-A. Flores, F.-J. Sierro, M. Grosjean, G. Francés, and B. Alonso
Clim. Past, 11, 1635–1651, https://doi.org/10.5194/cp-11-1635-2015, https://doi.org/10.5194/cp-11-1635-2015, 2015
Short summary
Short summary
Coccolithophore distribution in 88 surface sediment samples in the Atlantic Ocean and western Mediterranean was mainly influenced by salinity at 10m depth. A quantitative coccolithophore-based transfer function was developed and applied to a fossil sediment core to estimate sea surface salinity (SSS). The quality of this function and the reliability of the SSS reconstruction were assessed by statistical analyses and discussed. Several centennial SSS changes are identified for the last 15.5 ka.
I. Hernández-Almeida, F.-J. Sierro, I. Cacho, and J.-A. Flores
Clim. Past, 11, 687–696, https://doi.org/10.5194/cp-11-687-2015, https://doi.org/10.5194/cp-11-687-2015, 2015
Short summary
Short summary
This manuscript presents new Mg/Ca and previously published δ18O measurements of Neogloboquadrina pachyderma sinistral for MIS 31-19, from a sediment core from the subpolar North Atlantic. The mechanism proposed here involves northward subsurface transport of warm and salty subtropical waters during periods of weaker AMOC, leading to ice-sheet instability and IRD discharge. This is the first time that these rapid climate oscillations are described for the early Pleistocene.
M. N. Müller, M. Lebrato, U. Riebesell, J. Barcelos e Ramos, K. G. Schulz, S. Blanco-Ameijeiras, S. Sett, A. Eisenhauer, and H. M. Stoll
Biogeosciences, 11, 1065–1075, https://doi.org/10.5194/bg-11-1065-2014, https://doi.org/10.5194/bg-11-1065-2014, 2014
Related subject area
Biogeochemistry: Open Ocean
Spatial distributions of iron and manganese in surface waters of the Arctic's Laptev and East Siberian seas
Climate-driven shifts in Southern Ocean primary producers and biogeochemistry in CMIP6 models
Ocean acidification trends and carbonate system dynamics across the North Atlantic subpolar gyre water masses during 2009–2019
Sedimentary organic matter signature hints at the phytoplankton-driven biological carbon pump in the central Arabian Sea
Hydrological cycle amplification imposes spatial patterns on the climate change response of ocean pH and carbonate chemistry
Phytoplankton responses to iron and macronutrient fluxes from subsurface waters in the western North Pacific in summer
Assessing the tropical Atlantic biogeochemical processes in the Norwegian Earth System Model
Evolution of oxygen and stratification and their relationship in the North Pacific Ocean in CMIP6 Earth system models
Evaluation of CMIP6 model performance in simulating historical biogeochemistry across the southern South China Sea
Drivers of decadal trends in the ocean carbon sink in the past, present, and future in Earth system models
Anthropogenic carbon storage and its decadal changes in the Atlantic between 1990–2020
Ocean alkalinity enhancement impacts: regrowth of marine microalgae in alkaline mineral concentrations simulating the initial concentrations after ship-based dispersions
Inadequacies in the representation of sub-seasonal phytoplankton dynamics in Earth system models
Climatic controls on metabolic constraints in the ocean
Effects of grain size and seawater salinity on magnesium hydroxide dissolution and secondary calcium carbonate precipitation kinetics: implications for ocean alkalinity enhancement
Hybrid model estimate of the ocean carbon sink from 1959 to 2022
Relationships between the concentration of particulate organic nitrogen and the inherent optical properties of seawater in oceanic surface waters
Short-term response of Emiliania huxleyi growth and morphology to abrupt salinity stress
Massive and localized export of selected marine snow types at eddy edges in the South Atlantic Ocean
Assessing the impact of CO2-equilibrated ocean alkalinity enhancement on microbial metabolic rates in an oligotrophic system
Phosphomonoesterase and phosphodiesterase activities in the eastern Mediterranean in two contrasting seasonal situations
Net primary production annual maxima in the North Atlantic projected to shift in the 21st century
Testing the influence of light on nitrite cycling in the eastern tropical North Pacific
Loss of nitrogen via anaerobic ammonium oxidation (anammox) in the California Current system during the late Quaternary
Technical note: Assessment of float pH data quality control methods – a case study in the subpolar northwest Atlantic Ocean
Linking northeastern North Pacific oxygen changes to upstream surface outcrop variations
Ocean alkalinity enhancement in an open ocean ecosystem: Biogeochemical responses and carbon storage durability
Underestimation of multi-decadal global O2 loss due to an optimal interpolation method
Reviews and syntheses: expanding the global coverage of gross primary production and net community production measurements using Biogeochemical-Argo floats
Characteristics of surface physical and biogeochemical parameters within mesoscale eddies in the Southern Ocean
Seasonal dynamics and annual budget of dissolved inorganic carbon in the northwestern Mediterranean deep-convection region
The fingerprint of climate variability on the surface ocean cycling of iron and its isotopes
Reconstructing the ocean's mesopelagic zone carbon budget: sensitivity and estimation of parameters associated with prokaryotic remineralization
Seasonal cycles of biogeochemical fluxes in the Scotia Sea, Southern Ocean: a stable isotope approach
Absence of photophysiological response to iron addition in autumn phytoplankton in the Antarctic sea-ice zone
Optimal parameters for the ocean's nutrient, carbon, and oxygen cycles compensate for circulation biases but replumb the biological pump
Importance of multiple sources of iron for the upper-ocean biogeochemistry over the northern Indian Ocean
Exploring the role of different data types and timescales in the quality of marine biogeochemical model calibration
All about nitrite: exploring nitrite sources and sinks in the eastern tropical North Pacific oxygen minimum zone
Reconstructing ocean carbon storage with CMIP6 Earth system models and synthetic Argo observations
Using machine learning and Biogeochemical-Argo (BGC-Argo) floats to assess biogeochemical models and optimize observing system design
The representation of alkalinity and the carbonate pump from CMIP5 to CMIP6 Earth system models and implications for the carbon cycle
Model estimates of metazoans' contributions to the biological carbon pump
Tracing differences in iron supply to the Mid-Atlantic Ridge valley between hydrothermal vent sites: implications for the addition of iron to the deep ocean
Nitrite cycling in the primary nitrite maxima of the eastern tropical North Pacific
Hotspots and drivers of compound marine heatwaves and low net primary production extremes
Ecosystem impacts of marine heat waves in the northeast Pacific
Tracing the role of Arctic shelf processes in Si and N cycling and export through the Fram Strait: insights from combined silicon and nitrate isotopes
Controls on the relative abundances and rates of nitrifying microorganisms in the ocean
The response of diazotrophs to nutrient amendment in the South China Sea and western North Pacific
Naoya Kanna, Kazutaka Tateyama, Takuji Waseda, Anna Timofeeva, Maria Papadimitraki, Laura Whitmore, Hajime Obata, Daiki Nomura, Hiroshi Ogawa, Youhei Yamashita, and Igor Polyakov
Biogeosciences, 22, 1057–1076, https://doi.org/10.5194/bg-22-1057-2025, https://doi.org/10.5194/bg-22-1057-2025, 2025
Short summary
Short summary
This article presents data on iron and manganese, essential micronutrients for primary producers in the Arctic Laptev and East Siberian seas (LESS). There, observations were made through international cooperation with the Nansen and Amundsen Basin Observational System expedition during the late summer of 2021. The results from this study indicate that the major sources controlling the iron and manganese distributions on the LESS continental margins are river discharge and shelf sediment input.
Ben J. Fisher, Alex J. Poulton, Michael P. Meredith, Kimberlee Baldry, Oscar Schofield, and Sian F. Henley
Biogeosciences, 22, 975–994, https://doi.org/10.5194/bg-22-975-2025, https://doi.org/10.5194/bg-22-975-2025, 2025
Short summary
Short summary
The Southern Ocean is a rapidly warming environment, with subsequent impacts on ecosystems and biogeochemical cycling. This study examines changes in phytoplankton and biogeochemistry using a range of climate models. Under climate change, the Southern Ocean will be warmer, more acidic and more productive and will have reduced nutrient availability by 2100. However, there is substantial variability between models across key productivity parameters. We propose ways of reducing this uncertainty.
David Curbelo-Hernández, Fiz F. Pérez, Melchor González-Dávila, Sergey V. Gladyshev, Aridane G. González, David González-Santana, Antón Velo, Alexey Sokov, and J. Magdalena Santana-Casiano
Biogeosciences, 21, 5561–5589, https://doi.org/10.5194/bg-21-5561-2024, https://doi.org/10.5194/bg-21-5561-2024, 2024
Short summary
Short summary
The study evaluated CO2–carbonate system dynamics in the North Atlantic subpolar gyre during 2009–2019. Significant ocean acidification, largely due to rising anthropogenic CO2 levels, was found. Cooling, freshening, and enhanced convective processes intensified this trend, affecting calcite and aragonite saturation. The findings contribute to a deeper understanding of ocean acidification and improve our knowledge about its impact on marine ecosystems.
Medhavi Pandey, Haimanti Biswas, Daniel Birgel, Nicole Burdanowitz, and Birgit Gaye
Biogeosciences, 21, 4681–4698, https://doi.org/10.5194/bg-21-4681-2024, https://doi.org/10.5194/bg-21-4681-2024, 2024
Short summary
Short summary
We analysed sea surface temperature (SST) proxy and plankton biomarkers in sediments that accumulate sinking material signatures from surface waters in the central Arabian Sea (21°–11° N, 64° E), a tropical basin impacted by monsoons. We saw a north–south SST gradient, and the biological proxies showed more organic matter from larger algae in the north. Smaller algae and zooplankton were more numerous in the south. These trends were related to ocean–atmospheric processes and oxygen availability.
Allison Hogikyan and Laure Resplandy
Biogeosciences, 21, 4621–4636, https://doi.org/10.5194/bg-21-4621-2024, https://doi.org/10.5194/bg-21-4621-2024, 2024
Short summary
Short summary
Rising atmospheric CO2 influences ocean carbon chemistry, leading to ocean acidification. Global warming introduces spatial patterns in the intensity of ocean acidification. We show that the most prominent spatial patterns are controlled by warming-driven changes in rainfall and evaporation, not by the direct effect of warming on carbon chemistry and pH. These evaporation and rainfall patterns oppose acidification in saltier parts of the ocean and enhance acidification in fresher regions.
Huailin Deng, Koji Suzuki, Ichiro Yasuda, Hiroshi Ogawa, and Jun Nishioka
EGUsphere, https://doi.org/10.5194/egusphere-2024-3064, https://doi.org/10.5194/egusphere-2024-3064, 2024
Short summary
Short summary
Iron (Fe) and nitrate are vital for primary production in the North Pacific. Sedimentary Fe is carried by North Pacific Intermediate Water to the north Pacific, but the nutrient return path and its effect on phytoplankton are unclear. By combining Fe and macronutrient fluxes with phytoplankton composition, this study firstly revealed that Fe supply from subsurface greatly controls diatom abundance and identified the nutrient return path in the subarctic gyre and Kuroshio-Oyashio Transition Area.
Shunya Koseki, Lander R. Crespo, Jerry Tjiputra, Filippa Fransner, Noel S. Keenlyside, and David Rivas
Biogeosciences, 21, 4149–4168, https://doi.org/10.5194/bg-21-4149-2024, https://doi.org/10.5194/bg-21-4149-2024, 2024
Short summary
Short summary
We investigated how the physical biases of an Earth system model influence the marine biogeochemical processes in the tropical Atlantic. With four different configurations of the model, we have shown that the versions with better SST reproduction tend to better represent the primary production and air–sea CO2 flux in terms of climatology, seasonal cycle, and response to climate variability.
Lyuba Novi, Annalisa Bracco, Takamitsu Ito, and Yohei Takano
Biogeosciences, 21, 3985–4005, https://doi.org/10.5194/bg-21-3985-2024, https://doi.org/10.5194/bg-21-3985-2024, 2024
Short summary
Short summary
We explored the relationship between oxygen and stratification in the North Pacific Ocean using a combination of data mining and machine learning. We used isopycnic potential vorticity (IPV) as an indicator to quantify ocean ventilation and analyzed its predictability, a strong O2–IPV connection, and predictability for IPV in the tropical Pacific. This opens new routes for monitoring ocean O2 through few observational sites co-located with more abundant IPV measurements in the tropical Pacific.
Winfred Marshal, Jing Xiang Chung, Nur Hidayah Roseli, Roswati Md Amin, and Mohd Fadzil Bin Mohd Akhir
Biogeosciences, 21, 4007–4035, https://doi.org/10.5194/bg-21-4007-2024, https://doi.org/10.5194/bg-21-4007-2024, 2024
Short summary
Short summary
This study stands out for thoroughly examining CMIP6 ESMs' ability to simulate biogeochemical variables in the southern South China Sea, an economically important region. It assesses variables like chlorophyll, phytoplankton, nitrate, and oxygen on annual and seasonal scales. While global assessments exist, this study addresses a gap by objectively ranking 13 CMIP6 ocean biogeochemistry models' performance at a regional level, focusing on replicating specific observed biogeochemical variables.
Jens Terhaar
Biogeosciences, 21, 3903–3926, https://doi.org/10.5194/bg-21-3903-2024, https://doi.org/10.5194/bg-21-3903-2024, 2024
Short summary
Short summary
Despite the ocean’s importance in the carbon cycle and hence the climate, observing the ocean carbon sink remains challenging. Here, I use an ensemble of 12 models to understand drivers of decadal trends of the past, present, and future ocean carbon sink. I show that 80 % of the decadal trends in the multi-model mean ocean carbon sink can be explained by changes in decadal trends in atmospheric CO2. The remaining 20 % are due to internal climate variability and ocean heat uptake.
Reiner Steinfeldt, Monika Rhein, and Dagmar Kieke
Biogeosciences, 21, 3839–3867, https://doi.org/10.5194/bg-21-3839-2024, https://doi.org/10.5194/bg-21-3839-2024, 2024
Short summary
Short summary
We calculate the amount of anthropogenic carbon (Cant) in the Atlantic for the years 1990, 2000, 2010 and 2020. Cant is the carbon that is taken up by the ocean as a result of humanmade CO2 emissions. To determine the amount of Cant, we apply a technique that is based on the observations of other humanmade gases (e.g., chlorofluorocarbons). Regionally, changes in ocean ventilation have an impact on the storage of Cant. Overall, the increase in Cant is driven by the rising CO2 in the atmosphere.
Stephanie Delacroix, Tor Jensen Nystuen, August E. Dessen Tobiesen, Andrew L. King, and Erik Höglund
Biogeosciences, 21, 3677–3690, https://doi.org/10.5194/bg-21-3677-2024, https://doi.org/10.5194/bg-21-3677-2024, 2024
Short summary
Short summary
The addition of alkaline minerals into the ocean might reduce excessive anthropogenic CO2 emissions. Magnesium hydroxide can be added in large amounts because of its low seawater solubility without reaching harmful pH levels. The toxicity effect results of magnesium hydroxide, by simulating the expected concentrations from a ship's dispersion scenario, demonstrated low impacts on both sensitive and local assemblages of marine microalgae when compared to calcium hydroxide.
Madhavan Girijakumari Keerthi, Olivier Aumont, Lester Kwiatkowski, and Marina Levy
EGUsphere, https://doi.org/10.5194/egusphere-2024-2294, https://doi.org/10.5194/egusphere-2024-2294, 2024
Short summary
Short summary
Our study assesses the capability of CMIP6 models to reproduce satellite observations of sub-seasonal chlorophyll variability. Models struggle to reproduce the sub-seasonal variance and its contribution across timescales. Some models overestimate sub-seasonal variance and exaggerate its role in annual fluctuations, while others underestimate it. Underestimation is likely due to the coarse resolution of models, while overestimation may result from intrinsic oscillations in biogeochemical models.
Precious Mongwe, Matthew Long, Takamitsu Ito, Curtis Deutsch, and Yeray Santana-Falcón
Biogeosciences, 21, 3477–3490, https://doi.org/10.5194/bg-21-3477-2024, https://doi.org/10.5194/bg-21-3477-2024, 2024
Short summary
Short summary
We use a collection of measurements that capture the physiological sensitivity of organisms to temperature and oxygen and a CESM1 large ensemble to investigate how natural climate variations and climate warming will impact the ability of marine heterotrophic marine organisms to support habitats in the future. We find that warming and dissolved oxygen loss over the next several decades will reduce the volume of ocean habitats and will increase organisms' vulnerability to extremes.
Charly A. Moras, Tyler Cyronak, Lennart T. Bach, Renaud Joannes-Boyau, and Kai G. Schulz
Biogeosciences, 21, 3463–3475, https://doi.org/10.5194/bg-21-3463-2024, https://doi.org/10.5194/bg-21-3463-2024, 2024
Short summary
Short summary
We investigate the effects of mineral grain size and seawater salinity on magnesium hydroxide dissolution and calcium carbonate precipitation kinetics for ocean alkalinity enhancement. Salinity did not affect the dissolution, but calcium carbonate formed earlier at lower salinities due to the lower magnesium and dissolved organic carbon concentrations. Smaller grain sizes dissolved faster but calcium carbonate precipitated earlier, suggesting that medium grain sizes are optimal for kinetics.
Jens Terhaar
EGUsphere, https://doi.org/10.5194/egusphere-2024-2171, https://doi.org/10.5194/egusphere-2024-2171, 2024
Short summary
Short summary
The ocean is a major natural carbon sink. Despite its importance, estimates of the ocean carbon sink remain uncertain. Here, I present a hybrid model estimate of the ocean carbon sink from 1959 to 2022. By combining ocean models in hindcast mode and Earth System Models, I keep the strength of each approach and remove the respective weaknesses. This hybrid model estimate is similar in magnitude than the best estimate of the Global Carbon Budget but 70 % less uncertain.
Alain Fumenia, Hubert Loisel, Rick Allen Reynolds, and Dariusz Stramski
EGUsphere, https://doi.org/10.5194/egusphere-2024-2218, https://doi.org/10.5194/egusphere-2024-2218, 2024
Short summary
Short summary
Particulate organic nitrogen (PON) in the ocean refers to nitrogen contained in particles suspended such as phytoplankton, zooplankton, bacteria, viruses, and organic detritus. We used field measurements to determine relationships between PON and inherent optical properties of seawater across a broad range of marine environments. The presented relationships are expected to have application in the assessment of PON distribution and variations from in situ and satellite optical observations
Rosie M. Sheward, Christina Gebühr, Jörg Bollmann, and Jens O. Herrle
Biogeosciences, 21, 3121–3141, https://doi.org/10.5194/bg-21-3121-2024, https://doi.org/10.5194/bg-21-3121-2024, 2024
Short summary
Short summary
How quickly do marine microorganisms respond to salinity stress? Our experiments with the calcifying marine plankton Emiliania huxleyi show that growth and cell morphology responded to salinity stress within as little as 24–48 hours, demonstrating that morphology and calcification are sensitive to salinity over a range of timescales. Our results have implications for understanding the short-term role of E. huxleyi in biogeochemical cycles and in size-based paleoproxies for salinity.
Alexandre Accardo, Rémi Laxenaire, Alberto Baudena, Sabrina Speich, Rainer Kiko, and Lars Stemmann
EGUsphere, https://doi.org/10.5194/egusphere-2024-1558, https://doi.org/10.5194/egusphere-2024-1558, 2024
Short summary
Short summary
The open ocean helps mitigate climate change by storing CO2 through the biological carbon pump (BCP). The BCP involves processes like phytoplankton capturing CO2 and sequestering it in the deep ocean via marine snow production. We found significant marine snow accumulation from the surface to 600 meters deep in frontal regions between eddies. We suggest that the coupling of hydrodynamics at eddy edges and biological activity (via planktonic organisms) may enhanced this process.
Laura Marín-Samper, Javier Arístegui, Nauzet Hernández-Hernández, Joaquín Ortiz, Stephen D. Archer, Andrea Ludwig, and Ulf Riebesell
Biogeosciences, 21, 2859–2876, https://doi.org/10.5194/bg-21-2859-2024, https://doi.org/10.5194/bg-21-2859-2024, 2024
Short summary
Short summary
Our planet is facing a climate crisis. Scientists are working on innovative solutions that will aid in capturing the hard to abate emissions before it is too late. Exciting research reveals that ocean alkalinity enhancement, a key climate change mitigation strategy, does not harm phytoplankton, the cornerstone of marine ecosystems. Through meticulous study, we may have uncovered a positive relationship: up to a specific limit, enhancing ocean alkalinity boosts photosynthesis by certain species.
France Van Wambeke, Pascal Conan, Mireille Pujo-Pay, Vincent Taillandier, Olivier Crispi, Alexandra Pavlidou, Sandra Nunige, Morgane Didry, Christophe Salmeron, and Elvira Pulido-Villena
Biogeosciences, 21, 2621–2640, https://doi.org/10.5194/bg-21-2621-2024, https://doi.org/10.5194/bg-21-2621-2024, 2024
Short summary
Short summary
Phosphomonoesterase (PME) and phosphodiesterase (PDE) activities over the epipelagic zone are described in the eastern Mediterranean Sea in winter and autumn. The types of concentration kinetics obtained for PDE (saturation at 50 µM, high Km, high turnover times) compared to those of PME (saturation at 1 µM, low Km, low turnover times) are discussed in regard to the possible inequal distribution of PDE and PME in the size continuum of organic material and accessibility to phosphodiesters.
Jenny Hieronymus, Magnus Hieronymus, Matthias Gröger, Jörg Schwinger, Raffaele Bernadello, Etienne Tourigny, Valentina Sicardi, Itzel Ruvalcaba Baroni, and Klaus Wyser
Biogeosciences, 21, 2189–2206, https://doi.org/10.5194/bg-21-2189-2024, https://doi.org/10.5194/bg-21-2189-2024, 2024
Short summary
Short summary
The timing of the net primary production annual maxima in the North Atlantic in the period 1750–2100 is investigated using two Earth system models and the high-emissions scenario SSP5-8.5. It is found that, for most of the region, the annual maxima occur progressively earlier, with the most change occurring after the year 2000. Shifts in the seasonality of the primary production may impact the entire ecosystem, which highlights the need for long-term monitoring campaigns in this area.
Nicole M. Travis, Colette L. Kelly, and Karen L. Casciotti
Biogeosciences, 21, 1985–2004, https://doi.org/10.5194/bg-21-1985-2024, https://doi.org/10.5194/bg-21-1985-2024, 2024
Short summary
Short summary
We conducted experimental manipulations of light level on microbial communities from the primary nitrite maximum. Overall, while individual microbial processes have different directions and magnitudes in their response to increasing light, the net community response is a decline in nitrite production with increasing light. We conclude that while increased light may decrease net nitrite production, high-light conditions alone do not exclude nitrification from occurring in the surface ocean.
Zoë Rebecca van Kemenade, Zeynep Erdem, Ellen Christine Hopmans, Jaap Smede Sinninghe Damsté, and Darci Rush
Biogeosciences, 21, 1517–1532, https://doi.org/10.5194/bg-21-1517-2024, https://doi.org/10.5194/bg-21-1517-2024, 2024
Short summary
Short summary
The California Current system (CCS) hosts the eastern subtropical North Pacific oxygen minimum zone (ESTNP OMZ). This study shows anaerobic ammonium oxidizing (anammox) bacteria cause a loss of bioavailable nitrogen (N) in the ESTNP OMZ throughout the late Quaternary. Anammox occurred during both glacial and interglacial periods and was driven by the supply of organic matter and changes in ocean currents. These findings may have important consequences for biogeochemical models of the CCS.
Cathy Wimart-Rousseau, Tobias Steinhoff, Birgit Klein, Henry Bittig, and Arne Körtzinger
Biogeosciences, 21, 1191–1211, https://doi.org/10.5194/bg-21-1191-2024, https://doi.org/10.5194/bg-21-1191-2024, 2024
Short summary
Short summary
The marine CO2 system can be measured independently and continuously by BGC-Argo floats since numerous pH sensors have been developed to suit these autonomous measurements platforms. By applying the Argo correction routines to float pH data acquired in the subpolar North Atlantic Ocean, we report the uncertainty and lack of objective criteria associated with the choice of the reference method as well the reference depth for the pH correction.
Sabine Mecking and Kyla Drushka
Biogeosciences, 21, 1117–1133, https://doi.org/10.5194/bg-21-1117-2024, https://doi.org/10.5194/bg-21-1117-2024, 2024
Short summary
Short summary
This study investigates whether northeastern North Pacific oxygen changes may be caused by surface density changes in the northwest as water moves along density horizons from the surface into the subsurface ocean. A correlation is found with a lag that about matches the travel time of water from the northwest to the northeast. Salinity is the main driver causing decadal changes in surface density, whereas salinity and temperature contribute about equally to long-term declining density trends.
Allanah Joy Paul, Mathias Haunost, Silvan Urs Goldenberg, Jens Hartmann, Nicolás Sánchez, Julieta Schneider, Niels Suitner, and Ulf Riebesell
EGUsphere, https://doi.org/10.5194/egusphere-2024-417, https://doi.org/10.5194/egusphere-2024-417, 2024
Short summary
Short summary
Ocean alkalinity enhancement (OAE) is being assessed for its potential to absorb atmospheric CO2 and store it for a long time. OAE still needs comprehensive assessment of its safety and effectiveness. We studied an idealised OAE application in a natural low nutrient ecosystem over one month. Our results showed that biogeochemical functioning remained mostly stable, but that the long-term capability for storing carbon may be limited at high alkalinity concentration.
Takamitsu Ito, Hernan E. Garcia, Zhankun Wang, Shoshiro Minobe, Matthew C. Long, Just Cebrian, James Reagan, Tim Boyer, Christopher Paver, Courtney Bouchard, Yohei Takano, Seth Bushinsky, Ahron Cervania, and Curtis A. Deutsch
Biogeosciences, 21, 747–759, https://doi.org/10.5194/bg-21-747-2024, https://doi.org/10.5194/bg-21-747-2024, 2024
Short summary
Short summary
This study aims to estimate how much oceanic oxygen has been lost and its uncertainties. One major source of uncertainty comes from the statistical gap-filling methods. Outputs from Earth system models are used to generate synthetic observations where oxygen data are extracted from the model output at the location and time of historical oceanographic cruises. Reconstructed oxygen trend is approximately two-thirds of the true trend.
Robert W. Izett, Katja Fennel, Adam C. Stoer, and David P. Nicholson
Biogeosciences, 21, 13–47, https://doi.org/10.5194/bg-21-13-2024, https://doi.org/10.5194/bg-21-13-2024, 2024
Short summary
Short summary
This paper provides an overview of the capacity to expand the global coverage of marine primary production estimates using autonomous ocean-going instruments, called Biogeochemical-Argo floats. We review existing approaches to quantifying primary production using floats, provide examples of the current implementation of the methods, and offer insights into how they can be better exploited. This paper is timely, given the ongoing expansion of the Biogeochemical-Argo array.
Qian Liu, Yingjie Liu, and Xiaofeng Li
Biogeosciences, 20, 4857–4874, https://doi.org/10.5194/bg-20-4857-2023, https://doi.org/10.5194/bg-20-4857-2023, 2023
Short summary
Short summary
In the Southern Ocean, abundant eddies behave opposite to our expectations. That is, anticyclonic (cyclonic) eddies are cold (warm). By investigating the variations of physical and biochemical parameters in eddies, we find that abnormal eddies have unique and significant effects on modulating the parameters. This study fills a gap in understanding the effects of abnormal eddies on physical and biochemical parameters in the Southern Ocean.
Caroline Ulses, Claude Estournel, Patrick Marsaleix, Karline Soetaert, Marine Fourrier, Laurent Coppola, Dominique Lefèvre, Franck Touratier, Catherine Goyet, Véronique Guglielmi, Fayçal Kessouri, Pierre Testor, and Xavier Durrieu de Madron
Biogeosciences, 20, 4683–4710, https://doi.org/10.5194/bg-20-4683-2023, https://doi.org/10.5194/bg-20-4683-2023, 2023
Short summary
Short summary
Deep convection plays a key role in the circulation, thermodynamics, and biogeochemical cycles in the Mediterranean Sea, considered to be a hotspot of biodiversity and climate change. In this study, we investigate the seasonal and annual budget of dissolved inorganic carbon in the deep-convection area of the northwestern Mediterranean Sea.
Daniela König and Alessandro Tagliabue
Biogeosciences, 20, 4197–4212, https://doi.org/10.5194/bg-20-4197-2023, https://doi.org/10.5194/bg-20-4197-2023, 2023
Short summary
Short summary
Using model simulations, we show that natural and anthropogenic changes in the global climate leave a distinct fingerprint in the isotopic signatures of iron in the surface ocean. We find that these climate effects on iron isotopes are often caused by the redistribution of iron from different external sources to the ocean, due to changes in ocean currents, and by changes in algal growth, which take up iron. Thus, isotopes may help detect climate-induced changes in iron supply and algal uptake.
Chloé Baumas, Robin Fuchs, Marc Garel, Jean-Christophe Poggiale, Laurent Memery, Frédéric A. C. Le Moigne, and Christian Tamburini
Biogeosciences, 20, 4165–4182, https://doi.org/10.5194/bg-20-4165-2023, https://doi.org/10.5194/bg-20-4165-2023, 2023
Short summary
Short summary
Through the sink of particles in the ocean, carbon (C) is exported and sequestered when reaching 1000 m. Attempts to quantify C exported vs. C consumed by heterotrophs have increased. Yet most of the conducted estimations have led to C demands several times higher than C export. The choice of parameters greatly impacts the results. As theses parameters are overlooked, non-accurate values are often used. In this study we show that C budgets can be well balanced when using appropriate values.
Anna Belcher, Sian F. Henley, Katharine Hendry, Marianne Wootton, Lisa Friberg, Ursula Dallman, Tong Wang, Christopher Coath, and Clara Manno
Biogeosciences, 20, 3573–3591, https://doi.org/10.5194/bg-20-3573-2023, https://doi.org/10.5194/bg-20-3573-2023, 2023
Short summary
Short summary
The oceans play a crucial role in the uptake of atmospheric carbon dioxide, particularly the Southern Ocean. The biological pumping of carbon from the surface to the deep ocean is key to this. Using sediment trap samples from the Scotia Sea, we examine biogeochemical fluxes of carbon, nitrogen, and biogenic silica and their stable isotope compositions. We find phytoplankton community structure and physically mediated processes are important controls on particulate fluxes to the deep ocean.
Asmita Singh, Susanne Fietz, Sandy J. Thomalla, Nicolas Sanchez, Murat V. Ardelan, Sébastien Moreau, Hanna M. Kauko, Agneta Fransson, Melissa Chierici, Saumik Samanta, Thato N. Mtshali, Alakendra N. Roychoudhury, and Thomas J. Ryan-Keogh
Biogeosciences, 20, 3073–3091, https://doi.org/10.5194/bg-20-3073-2023, https://doi.org/10.5194/bg-20-3073-2023, 2023
Short summary
Short summary
Despite the scarcity of iron in the Southern Ocean, seasonal blooms occur due to changes in nutrient and light availability. Surprisingly, during an autumn bloom in the Antarctic sea-ice zone, the results from incubation experiments showed no significant photophysiological response of phytoplankton to iron addition. This suggests that ambient iron concentrations were sufficient, challenging the notion of iron deficiency in the Southern Ocean through extended iron-replete post-bloom conditions.
Benoît Pasquier, Mark Holzer, Matthew A. Chamberlain, Richard J. Matear, Nathaniel L. Bindoff, and François W. Primeau
Biogeosciences, 20, 2985–3009, https://doi.org/10.5194/bg-20-2985-2023, https://doi.org/10.5194/bg-20-2985-2023, 2023
Short summary
Short summary
Modeling the ocean's carbon and oxygen cycles accurately is challenging. Parameter optimization improves the fit to observed tracers but can introduce artifacts in the biological pump. Organic-matter production and subsurface remineralization rates adjust to compensate for circulation biases, changing the pathways and timescales with which nutrients return to the surface. Circulation biases can thus strongly alter the system’s response to ecological change, even when parameters are optimized.
Priyanka Banerjee
Biogeosciences, 20, 2613–2643, https://doi.org/10.5194/bg-20-2613-2023, https://doi.org/10.5194/bg-20-2613-2023, 2023
Short summary
Short summary
This study shows that atmospheric deposition is the most important source of iron to the upper northern Indian Ocean for phytoplankton growth. This is followed by iron from continental-shelf sediment. Phytoplankton increase following iron addition is possible only with high background levels of nitrate. Vertical mixing is the most important physical process supplying iron to the upper ocean in this region throughout the year. The importance of ocean currents in supplying iron varies seasonally.
Iris Kriest, Julia Getzlaff, Angela Landolfi, Volkmar Sauerland, Markus Schartau, and Andreas Oschlies
Biogeosciences, 20, 2645–2669, https://doi.org/10.5194/bg-20-2645-2023, https://doi.org/10.5194/bg-20-2645-2023, 2023
Short summary
Short summary
Global biogeochemical ocean models are often subjectively assessed and tuned against observations. We applied different strategies to calibrate a global model against observations. Although the calibrated models show similar tracer distributions at the surface, they differ in global biogeochemical fluxes, especially in global particle flux. Simulated global volume of oxygen minimum zones varies strongly with calibration strategy and over time, rendering its temporal extrapolation difficult.
John C. Tracey, Andrew R. Babbin, Elizabeth Wallace, Xin Sun, Katherine L. DuRussel, Claudia Frey, Donald E. Martocello III, Tyler Tamasi, Sergey Oleynik, and Bess B. Ward
Biogeosciences, 20, 2499–2523, https://doi.org/10.5194/bg-20-2499-2023, https://doi.org/10.5194/bg-20-2499-2023, 2023
Short summary
Short summary
Nitrogen (N) is essential for life; thus, its availability plays a key role in determining marine productivity. Using incubations of seawater spiked with a rare form of N measurable on a mass spectrometer, we quantified microbial pathways that determine marine N availability. The results show that pathways that recycle N have higher rates than those that result in its loss from biomass and present new evidence for anaerobic nitrite oxidation, a process long thought to be strictly aerobic.
Katherine E. Turner, Doug M. Smith, Anna Katavouta, and Richard G. Williams
Biogeosciences, 20, 1671–1690, https://doi.org/10.5194/bg-20-1671-2023, https://doi.org/10.5194/bg-20-1671-2023, 2023
Short summary
Short summary
We present a new method for reconstructing ocean carbon using climate models and temperature and salinity observations. To test this method, we reconstruct modelled carbon using synthetic observations consistent with current sampling programmes. Sensitivity tests show skill in reconstructing carbon trends and variability within the upper 2000 m. Our results indicate that this method can be used for a new global estimate for ocean carbon content.
Alexandre Mignot, Hervé Claustre, Gianpiero Cossarini, Fabrizio D'Ortenzio, Elodie Gutknecht, Julien Lamouroux, Paolo Lazzari, Coralie Perruche, Stefano Salon, Raphaëlle Sauzède, Vincent Taillandier, and Anna Teruzzi
Biogeosciences, 20, 1405–1422, https://doi.org/10.5194/bg-20-1405-2023, https://doi.org/10.5194/bg-20-1405-2023, 2023
Short summary
Short summary
Numerical models of ocean biogeochemistry are becoming a major tool to detect and predict the impact of climate change on marine resources and monitor ocean health. Here, we demonstrate the use of the global array of BGC-Argo floats for the assessment of biogeochemical models. We first detail the handling of the BGC-Argo data set for model assessment purposes. We then present 23 assessment metrics to quantify the consistency of BGC model simulations with respect to BGC-Argo data.
Alban Planchat, Lester Kwiatkowski, Laurent Bopp, Olivier Torres, James R. Christian, Momme Butenschön, Tomas Lovato, Roland Séférian, Matthew A. Chamberlain, Olivier Aumont, Michio Watanabe, Akitomo Yamamoto, Andrew Yool, Tatiana Ilyina, Hiroyuki Tsujino, Kristen M. Krumhardt, Jörg Schwinger, Jerry Tjiputra, John P. Dunne, and Charles Stock
Biogeosciences, 20, 1195–1257, https://doi.org/10.5194/bg-20-1195-2023, https://doi.org/10.5194/bg-20-1195-2023, 2023
Short summary
Short summary
Ocean alkalinity is critical to the uptake of atmospheric carbon and acidification in surface waters. We review the representation of alkalinity and the associated calcium carbonate cycle in Earth system models. While many parameterizations remain present in the latest generation of models, there is a general improvement in the simulated alkalinity distribution. This improvement is related to an increase in the export of biotic calcium carbonate, which closer resembles observations.
Jérôme Pinti, Tim DeVries, Tommy Norin, Camila Serra-Pompei, Roland Proud, David A. Siegel, Thomas Kiørboe, Colleen M. Petrik, Ken H. Andersen, Andrew S. Brierley, and André W. Visser
Biogeosciences, 20, 997–1009, https://doi.org/10.5194/bg-20-997-2023, https://doi.org/10.5194/bg-20-997-2023, 2023
Short summary
Short summary
Large numbers of marine organisms such as zooplankton and fish perform daily vertical migration between the surface (at night) and the depths (in the daytime). This fascinating migration is important for the carbon cycle, as these organisms actively bring carbon to depths where it is stored away from the atmosphere for a long time. Here, we quantify the contributions of different animals to this carbon drawdown and storage and show that fish are important to the biological carbon pump.
Alastair J. M. Lough, Alessandro Tagliabue, Clément Demasy, Joseph A. Resing, Travis Mellett, Neil J. Wyatt, and Maeve C. Lohan
Biogeosciences, 20, 405–420, https://doi.org/10.5194/bg-20-405-2023, https://doi.org/10.5194/bg-20-405-2023, 2023
Short summary
Short summary
Iron is a key nutrient for ocean primary productivity. Hydrothermal vents are a source of iron to the oceans, but the size of this source is poorly understood. This study examines the variability in iron inputs between hydrothermal vents in different geological settings. The vents studied release different amounts of Fe, resulting in plumes with similar dissolved iron concentrations but different particulate concentrations. This will help to refine modelling of iron-limited ocean productivity.
Nicole M. Travis, Colette L. Kelly, Margaret R. Mulholland, and Karen L. Casciotti
Biogeosciences, 20, 325–347, https://doi.org/10.5194/bg-20-325-2023, https://doi.org/10.5194/bg-20-325-2023, 2023
Short summary
Short summary
The primary nitrite maximum is a ubiquitous upper ocean feature where nitrite accumulates, but we still do not understand its formation and the co-occurring microbial processes involved. Using correlative methods and rates measurements, we found strong spatial patterns between environmental conditions and depths of the nitrite maxima, but not the maximum concentrations. Nitrification was the dominant source of nitrite, with occasional high nitrite production from phytoplankton near the coast.
Natacha Le Grix, Jakob Zscheischler, Keith B. Rodgers, Ryohei Yamaguchi, and Thomas L. Frölicher
Biogeosciences, 19, 5807–5835, https://doi.org/10.5194/bg-19-5807-2022, https://doi.org/10.5194/bg-19-5807-2022, 2022
Short summary
Short summary
Compound events threaten marine ecosystems. Here, we investigate the potentially harmful combination of marine heatwaves with low phytoplankton productivity. Using satellite-based observations, we show that these compound events are frequent in the low latitudes. We then investigate the drivers of these compound events using Earth system models. The models share similar drivers in the low latitudes but disagree in the high latitudes due to divergent factors limiting phytoplankton production.
Abigale M. Wyatt, Laure Resplandy, and Adrian Marchetti
Biogeosciences, 19, 5689–5705, https://doi.org/10.5194/bg-19-5689-2022, https://doi.org/10.5194/bg-19-5689-2022, 2022
Short summary
Short summary
Marine heat waves (MHWs) are a frequent event in the northeast Pacific, with a large impact on the region's ecosystems. Large phytoplankton in the North Pacific Transition Zone are greatly affected by decreased nutrients, with less of an impact in the Alaskan Gyre. For small phytoplankton, MHWs increase the spring small phytoplankton population in both regions thanks to reduced light limitation. In both zones, this results in a significant decrease in the ratio of large to small phytoplankton.
Margot C. F. Debyser, Laetitia Pichevin, Robyn E. Tuerena, Paul A. Dodd, Antonia Doncila, and Raja S. Ganeshram
Biogeosciences, 19, 5499–5520, https://doi.org/10.5194/bg-19-5499-2022, https://doi.org/10.5194/bg-19-5499-2022, 2022
Short summary
Short summary
We focus on the exchange of key nutrients for algae production between the Arctic and Atlantic oceans through the Fram Strait. We show that the export of dissolved silicon here is controlled by the availability of nitrate which is influenced by denitrification on Arctic shelves. We suggest that any future changes in the river inputs of silica and changes in denitrification due to climate change will impact the amount of silicon exported, with impacts on Atlantic algal productivity and ecology.
Emily J. Zakem, Barbara Bayer, Wei Qin, Alyson E. Santoro, Yao Zhang, and Naomi M. Levine
Biogeosciences, 19, 5401–5418, https://doi.org/10.5194/bg-19-5401-2022, https://doi.org/10.5194/bg-19-5401-2022, 2022
Short summary
Short summary
We use a microbial ecosystem model to quantitatively explain the mechanisms controlling observed relative abundances and nitrification rates of ammonia- and nitrite-oxidizing microorganisms in the ocean. We also estimate how much global carbon fixation can be associated with chemoautotrophic nitrification. Our results improve our understanding of the controls on nitrification, laying the groundwork for more accurate predictions in global climate models.
Zuozhu Wen, Thomas J. Browning, Rongbo Dai, Wenwei Wu, Weiying Li, Xiaohua Hu, Wenfang Lin, Lifang Wang, Xin Liu, Zhimian Cao, Haizheng Hong, and Dalin Shi
Biogeosciences, 19, 5237–5250, https://doi.org/10.5194/bg-19-5237-2022, https://doi.org/10.5194/bg-19-5237-2022, 2022
Short summary
Short summary
Fe and P are key factors controlling the biogeography and activity of marine N2-fixing microorganisms. We found lower abundance and activity of N2 fixers in the northern South China Sea than around the western boundary of the North Pacific, and N2 fixation rates switched from Fe–P co-limitation to P limitation. We hypothesize the Fe supply rates and Fe utilization strategies of each N2 fixer are important in regulating spatial variability in community structure across the study area.
Cited articles
Archer, D., Winguth, A., Lea, D., and Mahowald, N.: What caused the
glacial/interglacial atmospheric pCO2 cycles?, Rev. Geophys., 38,
159–189, https://doi.org/10.1029/1999RG000066, 2000.
Barker, S. and Elderfield, H.: Foraminiferal calcification response to
glacial-interglacial changes in atmospheric CO2, Science, 297,
833–836, https://doi.org/10.1126/science.1072815, 2002.
Båtvik, H., Heimdal, B. R., Fagerbakke, K. M., and Green, J. C.: Effects of
unbalanced nutrient regime on coccolith morphology and size in Emiliania huxleyi (Prymnesiophyceae),
Eur. J. Phycol., 32, 155–165,
https://doi.org/10.1080/09670269710001737089, 1997.
Beaufort, L.: Weight estimates of coccoliths using the optical properties
(birefringence) of calcite, Micropaleontology, 51, 289–297,
https://doi.org/10.2113/gsmicropal.51.4.289, 2005.
Beaufort, L., Probert, I., and Buchet, N.: Effects of acidification and
primary production on coccolith weight: Implications for carbonate transfer
from the surface to the deep ocean, Geochem. Geophy. Geosy., 8, 1–18,
https://doi.org/10.1029/2006GC001493, 2007.
Beaufort, L., Probert, I., De Garidel-Thoron, T., Bendif, E. M., Ruiz-Pino,
D., Metzl, N., Goyet, C., Buchet, N., Coupel, P., Grelaud, M., Rost, B., Rickaby, R. E. M., and de Vargas, C.: Sensitivity of coccolithophores to carbonate chemistry
and ocean acidification, Nature, 476, 80–83,
https://doi.org/10.1038/nature10295, 2011.
Beaufort, L., Gally, Y., Suchéras-Marx, B., Ferrand, P., and Duboisset, J.: Technical note: A universal method for measuring the thickness of microscopic calcite crystals, based on bidirectional circular polarization, Biogeosciences, 18, 775–785, https://doi.org/10.5194/bg-18-775-2021, 2021.
Beaufort, L., Bolton, C. T., Sarr, A. C., Suchéras-Marx, B., Rosenthal, Y., Donnadieu, Y., Barbarin, N., Bova, S., Cornuault, P., Gally, Y., Gray, E., Mazur, J. C., and Tetard, M.: Cyclic evolution of
phytoplankton forced by changes in tropical seasonality, Nature, 601,
79–84, https://doi.org/10.1038/s41586-021-04195-7, 2022.
Bollmann, J.: Technical Note: Weight approximation of coccoliths using a circular polarizer and interference colour derived retardation estimates – (The CPR Method), Biogeosciences, 11, 1899–1910, https://doi.org/10.5194/bg-11-1899-2014, 2014.
Bollmann, J. and Herrle, J. O.: Morphological variation of Emiliania huxleyi and sea surface
salinity, Earth Planet. Sc. Lett., 255, 273–288,
https://doi.org/10.1016/j.epsl.2006.12.029, 2007.
Bolton, C. T., Hernández-Sánchez, M. T., Fuertes, M. Á.,
González-Lemos, S., Abrevaya, L., Mendez-Vicente, A., Flores, J.-A., Probert, I., Giosan, L., Johnson, J., and Stoll, H. M.: Decrease in
coccolithophore calcification and CO2 since the middle Miocene, Nat.
Commun., 7, 10284, https://doi.org/10.1038/ncomms10284, 2016.
Bordiga, M., Bartol, M., and Henderiks, J.: Absolute nannofossil abundance
estimates: Quantifying the pros and cons of different techniques, Rev.
Micropaleontol., 58, 155–165, https://https://doi.org/10.1016/j.revmic.2015.05.002,
2015.
Broecker, W. S. and Clark, E.: Glacial-to-Holocene Redistribution of
Carbonate Ion in the Deep Sea, Science, 294, 2152–2155,
http://www.jstor.org/stable/3085356 (last access: 22 October 2022), 2001.
Broerse, A. T. C., Ziveri, P., and Honjo, S.: Coccolithophore (-CaCO3)
flux in the Sea of Okhotsk: Seasonality, settling and alteration processes,
Mar. Micropaleontol., 39, 179–200,
https://doi.org/10.1016/S0377-8398(00)00020-7, 2000.
Buiteveld, H.: A model for calculation of diffuse light attenuation (PAR) and
Secchi depth, Neth. J. Aquat. Ecol., 29, 55–65,
https://doi.org/10.1007/BF02061789, 1995.
Charalampopoulou, A., Poulton, A. J., Bakker, D. C. E., Lucas, M. I., Stinchcombe, M. C., and Tyrrell, T.: Environmental drivers of coccolithophore abundance and calcification across Drake Passage (Southern Ocean), Biogeosciences, 13, 5917–5935, https://doi.org/10.5194/bg-13-5917-2016, 2016.
Chen, C. T. A., Wang, S. L., Wang, B. J., and Pai, S. C.: Nutrient budgets
for the South China sea basin, Mar. Chem., 75, 281–300,
https://doi.org/10.1016/S0304-4203(01)00041-X, 2001.
Chen, C. T. A., Wang, S. L., Chou, W. C., and Sheu, D. D.: Carbonate
chemistry and projected future changes in pH and CaCO3 saturation state of
the South China Sea, Mar. Chem., 101, 277–305,
https://doi.org/10.1016/j.marchem.2006.01.007, 2006.
Chen, Y. L. L.: Spatial and seasonal variations of nitrate-based new
production and primary production in the South China Sea, Deep-Sea Res. Pt.
I, 52, 319–340, https://doi.org/10.1016/j.dsr.2004.11.001, 2005.
Chen, Y. L. L., Chen, H. Y., and Chung, C. W.: Seasonal variability of
coccolithophore abundance and assemblage in the northern South China Sea,
Deep-Sea Res. Pt. II, 54, 1617–1633,
https://doi.org/10.1016/j.dsr2.2007.05.005, 2007.
Chou, W. C., Sheu, D. D., Lee, B. S., Tseng, C. M., Chen, C. T. A., Wang, S.
L., and Wong, G. T. F.: Depth distributions of alkalinity, TCO2 and
δ13 CTCO2 at SEATS time-series site in the northern South
China Sea, Deep-Sea Res. Pt. II, 54,
1469–1485, https://doi.org/10.1016/j.dsr2.2007.05.002, 2007.
Conkright, M. E., Locarnini, R. A., Garcia, H. E., O'Brien, T. D., Boyer, T.
P., Stephens, C., and Antonov, J. I.: World Ocean Atlas 2001: Objective Analyses,
Data Statistics, and Figures, CD-ROM Documentation, National Oceanographic
Data Center, Silver Spring, MD, 17 pp., 2002.
Emerson, S. R. and Archer, D. Calcium carbonate preservation in the ocean,
Philos. T. R. Soc. A, 331, 29–40,
https://doi.org/10.1098/rsta.1990.0054, 1990.
Eppley, R. W., Rogers, J. N., and Mccarthy, J. J.: Half-saturation constants
for uptake of nitrate and ammonia, Limnol. Oceanogr., 14, 912–920,
https://doi.org/10.4319/lo.1969.14.6.0912, 1969.
Feldmeijer, W., Metcalfe, B., Scussolini, P., and Arthur, K.: The effect of
chemical pretreatment of sediment upon foraminiferal-based
proxies, Geochem. Geophy., Geosy., 14, 3996–4014,
https://doi.org/10.1002/ggge.20233, 2013.
Fernando, A. G. S., Peleo-Alampay, A. M., Lucero, E. S., and Wiesner, M. G.:
Surface sediment distribution of Florisphaera profunda in the South China Sea: an effect of
dissolution?, J. Nannoplankton Res., 29, 102–07, 2007a.
Flores, J. A., Marino, M., Sierro, F. J., Hodell, D. A., and Charles, C. D.:
Calcareous plankton dissolution pattern and coccolithophore assemblages
during the last 600 kyr at ODP Site 1089 (Cape Basin, South Atlantic):
Paleoceanographic implications, Palaeogeogr. Palaeocl., 196, 409–426,
https://doi.org/10.1016/S0031-0182(03)00467-X, 2003.
Fuertes, M. Á., Flores, J. A., and Sierro, F. J.: The use of circularly
polarized light for biometry, identification and estimation of mass of
coccoliths, Mar. Micropaleontol., 113, 44–55,
https://doi.org/10.1016/j.marmicro.2014.08.007, 2014.
Gerotto, A., Zhang, H., Nagai, R. H., Stoll, H. M., Figueira, R. C. L.,
Chuanlian, L., and Hernández-Almeida, I.: Morphological measurements of coccoliths from surface samples of South China Sea, Zenodo [data set],
https://doi.org/10.5281/zenodo.7271441, 2022.
Gerotto, A., Zhang, H., Nagai, R. H., Stoll, H. M., Figueira, R. C. L.,
Chuanlian, L., and Hernández-Almeida, I.: Morphological measurements of
coccoliths from surface samples of R/V SONNE cruise
SO95, PANGAEA [data set], https://doi.org/10.1594/PANGAEA.954015, 2023a.
Gerotto, A., Zhang, H., Nagai, R. H., Stoll, H. M., Figueira, R. C. L.,
Chuanlian, L., and Hernández-Almeida, I.: Coccolith dissolution
experiment from one sample of ODP Hole
130-807A, PANGAEA [data set], https://doi.org/10.1594/PANGAEA.954016, 2023b.
González-Lemos, S., Guitián, J., Fuertes, M.-Á., Flores, J.-A., and Stoll, H. M.: Technical note: An empirical method for absolute calibration of coccolith thickness, Biogeosciences, 15, 1079–1091, https://doi.org/10.5194/bg-15-1079-2018, 2018.
Goyet, C., Healy, R. J., and Ryan, J. P.: Global distribution of total
inorganic carbon and total alkalinity below the deepest winter mixed layer
depths, ORNL/CDIAC-127, NDP-076, Carbon Dioxide Information Analysis Center,
Oak Ridge National Laboratory, U.S. Department of Energy, Oak Ridge,
Tennessee, 40 pp., https://doi.org/10.2172/760546, 2000.
Guitián, J., Dunkley Jones, T., Hernández-Almeida, I., Löffel,
T., and Stoll, H. M.: Adaptations of coccolithophore size to selective
pressures during the Oligocene to Early Miocene high CO2 world,
Paleoceanogr. Paleocl., 35, e2020PA003918,
https://doi.org/10.1029/2020PA003918, 2020.
Guitián, J., Fuertes, M. Á., Flores, J.-A., Hernández-Almeida, I., and Stoll, H.: Variation in calcification of Reticulofenestra coccoliths over the Oligocene–Early Miocene, Biogeosciences, 19, 5007–5019, https://doi.org/10.5194/bg-19-5007-2022, 2022.
Hammer, Ø., Harper, D. A. T., and Ryan, P. D.: PAST: Paleontological
Statistics Software Package for Education and Data Analysis, Palaeontol.
Electron., 4, 1–9, https://doi.org/10.1016/j.bcp.2008.05.025, 2001.
Hay, W. W.: Carbonate fluxes and calcareous nannoplankton, in: Coccolithophores: From Molecular Processes
to Global Impact, edited by: Thierstein, H. and Young, J., Springer, Berlin, 509–528, 2004.
Henderiks, J. and Pagani, M.: Refining ancient carbon dioxide estimates:
Significance of coccolithophore cell size for alkenone-based pCO2
records, Paleoceanography, 22, 1–12,
https://doi.org/10.1029/2006PA001399, 2007.
Holcová, K. and Scheiner, F.: An experimental study on post-mortem
dissolution and overgrowth processes affecting coccolith assemblages: A
rapid and complex process, Geobiology, 21, 193–209,
https://doi.org/10.1111/gbi.12528, 2023.
Hönisch, B., Ridgwell, A., Schmidt, D. N., Thomas, E., Gibbs, S. J.,
Sluijs, A., Zeebe, R., Kump, L., Martindale, R. C., Greene, S. E., Kiessling, W., Ries, J., Zachos, J. C., Royer, D. L., Barker, S., Marchitto Jr., T. M., Moyer, R., Pelejero, C., Ziveri, P., Foster, G. L., and Williams, B.: The geological record of ocean acidification, Science,
335, 1058–1063, https://doi.org/10.1126/science.1208277, 2012.
Huang, W. and Wang, P.: Sediment mass and distribution in the South China
Sea since the Oligocene, Sci. China Ser. D, 49, 1147–1155,
https://https://doi.org/10.1007/s11430-006-2019-4, 2006.
Iglesias-Rodriguez, M. D., Halloran, P. R., Rickaby, R. E. M., Hall, I. R.,
Colmenero-Hidalgo, E., Gittins, J. R., Green, D. R. H., Tyrrell, T., Gibbs, S. J., Dassow, P. V., Rehm, E., Armbrust, E. V., and Boessenkool, K. P.: Phytoplankton calcification in
a high-CO2 world, Science, 320, 336–340,
https://doi.org/10.1126/science.1154122, 2008.
IPCC: Climate Change and Land: an IPCC special report on climate change,
desertification, land degradation, sustainable land management, food
security, and greenhouse gas fluxes in terrestrial ecosystems, edited by: Shukla, P. R.,
Skea, J., Calvo Buendia, E., Masson-Delmotte, V., Pörtner, H.-O.,
Roberts, D. C., Zhai, P., Slade, R., Connors, S., van Diemen, R., Ferrat, M.,
Haughey, E., Luz, S., Neogi, S., Pathak, M., Petzold, J., Portugal Pereira, J.,
Vyas, P., Huntley, E., Kissick, K., Belkacemi, M., and Malley, J., in press,
2019.
Iwasaki, S., Kimoto, K., Sasaki, O., Kano, H., Honda, M. C., and Okazaki, Y.:
Observation of the dissolution process of Globigerina bulloides tests (planktic foraminifera) by
X-ray microcomputed tomography, Paleoceanography, 30, 317–331,
https://doi.org/10.1002/2014PA002639, 2015.
Iwasaki, S., Kimoto, K., Okazaki, Y., and Ikehara, M.: Micro-CT scanning of
tests of three planktic foraminiferal species to clarify dissolution process
and progress, Geochem. Geophy. Geosy., 20, 6051–6065,
https://doi.org/10.1029/2019GC008456, 2019.
Johnsen, S. L. and Bollmann, J.: Segmentation, retardation and mass
approximation of birefringent particles on a standard light microscope, J.
Microsc., 280, 30–50, https://doi.org/10.1111/jmi.12932, 2020.
Jin, X., Liu, C., Poulton, A. J., Dai, M., and Guo, X.: Coccolithophore responses to environmental variability in the South China Sea: species composition and calcite content, Biogeosciences, 13, 4843–4861, https://doi.org/10.5194/bg-13-4843-2016, 2016.
Jin, X., Liu, C., and Zhang, H.: Coccolith morphological and assemblage
responses to dissolution in the recent sediments of the East China Sea, Mar.
Micropaleontol., 152, 101709,
https://doi.org/10.1016/j.marmicro.2018.09.001, 2019.
Jin, X., Liu, C., Xu, J., and Guo, X.: Coccolithophore abundance, degree of
calcification, and their contribution to particulate inorganic carbon in the
South China Sea, J. Geophys. Res.-Biogeo., 127, e2021JG006657,
https://doi.org/10.1029/2021JG006657, 2022a.
Jin, X., Ma, W., and Liu, C.: Origin of the long-term increase in coccolith
size and its implication for carbon cycle and climate over the past 2 Myr, Quaternary Sci. Rev., 290, 107642,
https://doi.org/10.1016/j.quascirev.2022.107642, 2022b.
Le, J. and Shackleton, N. J.: Carbonate dissolution fluctuations in the
western equatorial Pacific during the late Quaternary, Paleoceanography, 7,
21–42, https://doi.org/10.1029/91PA02854, 1992.
Libes, S. M.: An Introduction to Marine Biogeochemistry, 2nd Edn., edited by: Noone, K., Sumaila, R., and Diaz, R. J., Burlington,
MA,
Academic Press, Valuing the
Oceans, Stockholm Environmental Institute, 928 pp., ISBN 9780080916644, 2009.
Lin, J., Lee, Z., Ondrusek, M., and Du, K.: Remote sensing of normalized
diffuse
attenuation coefficient of downwelling irradiance, J. Geophys. Res.-Oceans,
121, 6717–6730, https://doi.org/10.1002/2016JC011895, 2016.
Liu, J., Xiang, R., Chen, M., Chen, Z., Yan, W., and Liu, F.: Influence of
the Kuroshio current intrusion on depositional environment in the Northern
South China Sea: Evidence from surface sediment records, Mar. Geol.,
285, 59–68, https://doi.org/10.1016/j.margeo.2011.05.010, 2011.
Lohman, G. P.: A model for variation in the chemistry of planktonic
foraminifera due to secondary calcification and selective dissolution,
Paleoceanogr. Paleocl., 10, 445–457,
https://doi.org/10.1029/95PA00059, 1995.
Luo, Y., Kienast, M., and Boudreau, B. P.: Invariance of the carbonate
chemistry of the South China Sea from the glacial period to the Holocene and
its implications to the Pacific Ocean carbonate system, Earth Planet. Sc.
Lett., 492, 112–120, https://doi.org/10.1016/j.epsl.2018.04.005, 2018.
Marsaglia, K., Milliken, K., Leckie, R., M., Tentori, D., Doran, L. IODP
Smear Slide Digital Reference for Sediment Analysis of Marine Mud. Part 2:
Methodology and Atlas of Biogenic Components, IODP Technical Note 2, International Ocean Discovery Program, 382 pp.,
https://doi.org/10.14379/iodp.tn.2.2015, 2015.
Murtugudde, R., Beauchamp, J., McClain, C. R., Lewis, M., and Busalacchi, A.:
Effects of penetrative radiation on the upper tropical ocean circulation, J.
Climate, 15, 470–486, https://doi.org/10.1175/1520-0442(2002)015<0470:EOPROT>2.0.CO;2, 2002.
Olson, H. C. and Smart, C. W.: Pleistocene climatic history reflected in planktonic foraminifera from ODP Site 1073 (Leg 174A), New Jersey margin, NW Atlantic Ocean, Mar. Micropaleontol., 51, 213–238, https://doi.org/10.1016/j.marmicro.2003.11.002, 2004.
Paasche, E.: Roles of nitrogen and phosphorus in coccolith formation in
Emiliania huxleyi (Prymnesiophyceae), Eur. J. Phycol., 33, 33–42,
https://doi.org/10.1080/09670269810001736513, 1998.
Pälike, H., Norris, R. D., Herrle, J. O., Wilson, P. A., Helen, K.,
Lear, C. H., Shackleton, N. J., Tripati, A. K., and Wade, B. S.: The heartbeat of the Oligocene climate system, Science,
314, 1894–1898, https://doi.org/10.1126/science.1133822, 2006.
Pälike, H., Lyle, M. W., Nishi, H., Raffi, I., Ridgwell, A., Gamage, K.,
Klaus, A., Acton, G., Anderson, L., Backman, J., Baldauf, J., Beltran, C., Bohaty, S.M., Bown, P., Busch, W., Channell, J. E. T., Chun, C. O. J., Delaney, M., Dewangan, P., Jones, T. D., Edgar, K. M., Evans, H., Fitch, P., Foster, G. L., Gussone, N., Hasegawa, H., Hathorne, E. C., Hayashi, H., Herrle, J. O., Holbourn, A., Hovan, S., Hyeong, K., Iijima, K., Ito, T., Kamikuri, S., Kimoto, K., Kuroda, J., Leon-Rodriguez, L., Malinverno, A., Moore, T. C., Murphy, B. H., Murphy, D. P., Nakamura, H., Organe, K., Ohneiser, C., Richter, C., Robinson, R., Rohling, E. J., Romero, O., Sawada, K., Scher, H., Schneider, L., Sluijs, A., Takata, H., Tian, J., Tsujimoto, A., Wade, B. S., Westerhold, T., Wilkens, R., Williams, T., Wilson, P. A., Yamamoto, Y., Yamamoto, S., Yamazaki, T., and Zeebe, R. E.: A Cenozoic record of the equatorial Pacific carbonate compensation
depth, Nature, 488, 609–614, https://doi.org/10.1038/nature11360,
2012.
Pierrot, D., Lewis, E., and Wallace, D. W. R.: MS Excel Program Developed for
CO2 System Calculations – version 2.1, ORNL/CDIAC-105a, Carbon Dioxide
Information Analysis Center, Oak Ridge National Laboratory, U.S. Department
of Energy, Oak Ridge, Tennessee,
https://cdiac.ess-dive.lbl.gov/ftp/co2sys/CO2SYS_calc_XLS_v2.1/ (last access: 28 July 2021), 2006.
Qu, T., Girton, J. B., and Whitehead, J. A.: Deepwater overflow through Luzon
Strait, J. Geophys. Res., 111, C01002,
https://doi.org/10.1029/2005JC003139, 2006.
Qu, T., Song, Y. T., and Yamagata, T.: An introduction to the South China Sea
throughflow: Its dynamics, variability, and application for climate, Dynam.
Atmos. Oceans, 47, 3–14,
https://doi.org/10.1016/j.dynatmoce.2008.05.001, 2009.
Rae, J. W. B., Zhang, Y. G., Liu, X., Foster, G. L., Stoll, H. M., and
Whiteford, R. D. M.: Atmospheric CO2 over the past 66 million years from
marine archives, Annu. Rev. Earth Pl. Sc., 49, 609–641,
https://doi.org/10.1146/annurev-earth-082420-063026, 2021.
Raven, J. A. and Crawfurd, K.: Environmental controls on coccolithophore
calcification, Mar. Ecol.-Prog. Ser., 470, 137–166, https://doi.org/10.3354/meps09993, 2012.
Rhodes, L. L., Peake, B. M., MacKenzie, A. L., and Marwick, S.:
Coccolithophores Gephyrocapsa oceanica and Emiliania huxleyi (Prymnesiophyceae = Haptophyceae) in New Zealand's
coastal waters: Characteristics of blooms and growth in laboratory culture,
New Zeal. J. Mar. Fresh., 29, 345–357,
https://doi.org/10.1080/00288330.1995.9516669, 1995.
Rickaby, R. E. M., Bard, E., Sonzogni, C., Rostek, F., Beaufort, L., Barker,
S., Rees, G., and Schrag, D. P.: Coccolith chemistry reveals secular variations in the global
ocean carbon cycle?, Earth Planet. Sc. Lett., 253, 83–95,
https://doi.org/10.1016/j.epsl.2006.10.016, 2007.
Ridgwell, A. and Zeebe, R. E.: The role of the global carbonate cycle in the
regulation and evolution of the Earth system, Earth Planet. Sc. Lett.,
234, 299–315, https://doi.org/10.1016/j.epsl.2005.03.006, 2005.
Riebesell, U., Zondervan, I., Rost, B., Tortell, P. D., Zeebe, R. E., and
Morel, F. M. M.: Reduced calcification of marine plankton in response to
increased atmospheric CO2, Nature, 407, 364–367,
https://doi.org/10.1038/35030078, 2000.
Rigual-Hernández, A. S., Trull, T. W., Nodder, S. D., Flores, J. A., Bostock, H., Abrantes, F., Eriksen, R. S., Sierro, F. J., Davies, D. M., Ballegeer, A.-M., Fuertes, M. A., and Northcote, L. C.: Coccolithophore biodiversity controls carbonate export in the Southern Ocean, Biogeosciences, 17, 245–263, https://doi.org/10.5194/bg-17-245-2020, 2020a.
Rigual-Hernández, A. S., Sánchez-Santos, J. M., Eriksen, R., Moy, A.
D., Sierro, F. J., Flores, J. A., Abrantes, F., Bostock, H., Nodder, S. D., González-Lanchas, A., and Trull, T. W.: Limited variability in the
phytoplankton Emiliania huxleyi since the pre-industrial era in the Subantarctic Southern
Ocean, Anthropocene, 31, 100254,
https://doi.org/10.1016/j.ancene.2020.100254, 2020b.
Roth, P. H. and Berger, W. H.: Distribution and dissolution of coccoliths in the South and Central Pacific, in: Dissolution of Deep-Sea Carbonates, edited by: Sliter, W. V., Be, A. W. H., and Berger, W. H., Cushman Foundation Foraminiferal Research, Spec. Publ., 13, 87–113, ISBN 9781970168075, 1975.
Roth, P. H. and Coulbourn, W. T.: Floral and solution patterns of coccoliths
in surface sediments of the North Pacific, Mar. Micropaleontol., 7, 1–52,
https://doi.org/10.1016/0377-8398(82)90014-7, 1982.
Sarmiento, J. L. and Gruber, N. (Eds.): Ocean Biogeochemical dynamics, Princeton, NJ,
Woodstock, Princeton University Press, 528 pp., ISBN 0691017077, 2006.
Schlitzer, R.: Ocean data View, https://odv.awi.de (last access: 28 June 2021), 2019.
Smart, C. W.: Abyssal NE Atlantic benthic foraminifera during the last 15 kyr: Relation to variations in seasonality of productivity, Mar. Micropaleontol., 69, 193–211, https://doi.org/10.1016/j.marmicro.2008.07.007, 2008.
Stoll, H. M. and Ziveri, P.: Separation of monospecific and restricted coccolith
assemblages from sediments using differential settling velocity, Mar.
Micropaleontol., 46, 209–221,
https://doi.org/10.1016/S0377-8398(02)00040-3, 2002.
Su, X., Liu, C., and Beaufort, L.: Late Quaternary coccolith weight
variations in the northern South China Sea and their environmental controls,
Mar. Micropaleontol., 154, 101798,
https://doi.org/10.1016/j.marmicro.2019.101798, 2020.
Subhas, A. V., Dong, S., Naviaux, J. D., Rollins, N. E., Ziveri, P., Gray,
W., Rae, J. W. B., Liu, X., Byrne, R. H., Chen, S., Moore, C., Martell-Bonet, L., Steiner, Z., Antler, G., Hu, H., Lunstrum, A., Hou, Y., Kemnitz, N., Stutsman, J., Pallacks, S., Dugenne, M., Quay, P. D., Berelson, W. M., and Adkins, J. F.: Shallow calcium carbonate cycling in the North Pacific Ocean,
Global Biogeochem. Cy., 36, 1–22, https://doi.org/10.1029/2022GB007388,
2022.
Sulpis, O., Boudreau, B. P., Mucci, A., Jenkins, C., Trossman, D. S., Arbic,
B. K., and Key, R. M.: Current CaCO3 dissolution at the seafloor caused
by anthropogenic CO2, P. Natl. Acad. Sci. USA, 115, 11700–11705,
https://doi.org/10.1073/pnas.1804250115, 2018.
Sulpis, O., Jeansson, E., Dinauer, A., Lauvset, S. K., and Middelburg, J. J.:
Calcium carbonate dissolution patterns in the ocean, Nat. Geosci., 14,
423–428, https://doi.org/10.1038/s41561-021-00743-y, 2021.
Thunell, R. C., Qingmin, M., Calvert, S. E., and Pedersen, T. F.:
Glacial-Holocene biogenic sedimentation patterns in the South China Sea:
Productivity variations and surface water pCO2, Paleoceanography, 7,
143–162, https://doi.org/10.1029/92PA00278, 1992.
Tian, J., Huang, E., and Pak, D. K.: East Asian winter monsoon variability
over the last glacial cycle: Insights from a latitudinal sea-surface
temperature gradient across the South China Sea, Palaeogeogr. Palaeocl.,
292, 319–324, https://doi.org/10.1016/j.palaeo.2010.04.005, 2010.
USGCRP: Climate Science Special Report: Fourth National Climate Assessment,
Volume I, edited by: Wuebbles, D. J., Fahey, D. W., Hibbard, K. A., Dokken, D. J.,
Stewart, B. C., and Maycock, T. K., U.S. Global Change Research
Program, Washington, DC, USA, 470 pp., https://doi.org/10.7930/J0J964J6, 2017.
Vollmar, N. M., Baumann, K.-H., Saavedra-Pellitero, M., and Hernández-Almeida, I.: Distribution of coccoliths in surface sediments across the Drake Passage and calcification of Emiliania huxleyi morphotypes, Biogeosciences, 19, 585–612, https://doi.org/10.5194/bg-19-585-2022, 2022.
Wan, S. and Jian, Z.: Deep water exchanges between the South China Sea and
the Pacific since the last glacial period, Paleoceanography, 29,
1162–1178, https://doi.org/10.1002/2013PA002578, 2014.
Wan, S., Jian, Z., and Dang, H.: Deep Hhydrography of the South China Sea and
deep water circulation in the Pacific since the Last Glacial Maximum,
Geochem. Geophy. Geosy., 19, 1447–1463,
https://doi.org/10.1029/2017GC007377, 2018.
Wan, S., Jian, Z., Gong, X., Dang, H., Wu, J., and Qiao, P.: Deep water
[CO
Wang, N., Huang, B.-Q., and Li, H.: Deep-water carbonate dissolution in the
northern South China Sea during Marine Isotope Stage 3, J. Palaeogeogr.,
5, 100–107, https://doi.org/10.1016/j.jop.2015.11.004, 2016.
Wang, P., Wang, L., Bian, Y., and Jian, Z.: Late Quaternary paleoceanography
of the South China Sea: surface circulation and carbonate cycles, Mar.
Geol., 127, 145–165, https://doi.org/10.1016/0025-3227(95)00008-M,
1995.
Wang, P., Li, Q., and Dai, M.: The South China Sea Deep: Introduction,
Deep-Sea Res. Pt. II, 122, 1–5,
https://doi.org/10.1016/j.dsr2.2015.11.004, 2015.
Wang, P. X. and Li, Q. Y. (Eds.): The South China Sea: Paleoceanography and
Sedimentology, Springer, Berlin, Heidelberg, New York, 506 pp., ISBN 140209744, 2009.
Young, J. R. and Ziveri, P.: Calculation of coccolith volume and its use in
calibration of carbonate flux estimates, Deep-Sea Res. Pt. II, 47, 1679–1700,
https://doi.org/10.1016/S0967-0645(00)00003-5, 2000.
Yu, J. and Elderfield, H.: Benthic foraminiferal
Yu, J., Menviel, L., Jin, Z. D., Thornalley, D. J. R., Barker, S.,
Marino, G., Rohling, E. J., Cai, Y., Zhang, F., Wang, X., Dai, Y., Chen, P., and Broecker, W. S.: Sequestration of carbon in the deep Atlantic during the
last glaciation, Nat. Geosci., 9, 319–324, https://doi.org/10.1038/ngeo2657,
2016.
Zachos, J. C., Röhl, U., Schellenberg, S. A., Sluijs, A., Hodell, D. A.,
Kelly, D. C., Thomas, E., Nicolo, M., Raffi, I., Lourens, L. J., Mccarren, H., and Kroon, D.: Paleoclimate: Rapid acidification of the ocean during
the Paleocene-Eocene thermal maximum, Science, 308, 1611–1615,
https://doi.org/10.1126/science.1109004, 2005.
Zhang, H., Liu, C., Jin, X., Shi, J., Zhao, S., and Jian, Z.: Dynamics of
primary productivity in the northern South China Sea over the past 24,000
years, Geochem. Geophy. Geosy., 17, 4878–4891,
https://doi.org/10.1002/2016GC006602, 2016.
Short summary
Based on the analysis of the response of coccolithophores’ morphological attributes in a laboratory dissolution experiment and surface sediment samples from the South China Sea, we proposed that the thickness shape (ks) factor of fossil coccoliths together with the normalized ks variation, which is the ratio of the standard deviation of ks (σ) over the mean ks (σ/ks), is a robust and novel proxy to reconstruct past changes in deep ocean carbon chemistry.
Based on the analysis of the response of coccolithophores’ morphological attributes in a...
Altmetrics
Final-revised paper
Preprint