Articles | Volume 16, issue 10
https://doi.org/10.5194/bg-16-2163-2019
© Author(s) 2019. 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-16-2163-2019
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Research article
| 
23 May 2019
Research article |
| 23 May 2019
| 23 May 2019
Latitudinal variations in δ30Si and δ15N signatures along the Peruvian shelf: quantifying the effects of nutrient utilization versus denitrification over the past 600 years
GEOMAR Helmholtz Centre for Ocean Research Kiel, 24148 Kiel, Germany
now at: Department of Oceanography, Dalhousie University,
Halifax, Nova Scotia, Canada
Claudia Ehlert
Max Planck Research Group – Marine Isotope Geochemistry, Carl von
Ossietzky University, 26129 Oldenburg, Germany
Philippe Martinez
Université de Bordeaux, CNRS, Environnements et
Paléoenvironnements Océaniques et Continentaux (EPOC), UMR 5805,
Pessac, France
Martin Frank
GEOMAR Helmholtz Centre for Ocean Research Kiel, 24148 Kiel, Germany
Ralph Schneider
Institute of Geosciences, University of Kiel, 24118 Kiel, Germany
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Biogeosciences, 21, 3927–3958, https://doi.org/10.5194/bg-21-3927-2024, https://doi.org/10.5194/bg-21-3927-2024, 2024
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Mengke Wang, Peng Zhang, Huishan Li, Guisen Deng, Deliang Kong, Sifang Kong, and Junjian Wang
Biogeosciences, 21, 2691–2704, https://doi.org/10.5194/bg-21-2691-2024, https://doi.org/10.5194/bg-21-2691-2024, 2024
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We developed and applied complementary analyses to characterize molecular-level carbon traits for water-grown and soil-grown fine roots. The adaptive strategy of developing more labile carbon in water-grown roots accelerated root decomposition and counteracted the decelerated effects of anoxia on decomposition, highlighting an indirect effect of environmental change on belowground carbon cycling.
Maria G. Digernes, Yasemin V. Bodur, Martí Amargant-Arumí, Oliver Müller, Jeffrey A. Hawkes, Stephen G. Kohler, Ulrike Dietrich, Marit Reigstad, and Maria Lund Paulsen
EGUsphere, https://doi.org/10.5194/egusphere-2024-1314, https://doi.org/10.5194/egusphere-2024-1314, 2024
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Dissolved (DOM) and particulate organic matter (POM) are in constant exchange, but usually studied as distinct entities. We investigated the dynamics between POM and DOM in a sub-Arctic fjord across different seasons by conducting bi-monthly aggregation-dissolution experiments. During the productive period, POM concentrations increased in the experiment while DOM molecules became more recalcitrant. During the winter period, POM concentrations decreased whereas DOM molecules became more labile.
Zhe-Xuan Zhang, Edith Parlanti, Christelle Anquetil, Jérôme Morelle, Anniet M. Laverman, Alexandre Thibault, Elisa Bou, and Arnaud Huguet
Biogeosciences, 21, 2227–2252, https://doi.org/10.5194/bg-21-2227-2024, https://doi.org/10.5194/bg-21-2227-2024, 2024
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Bacterial tetraethers have important implications for palaeoclimate reconstruction. However, fundamental understanding of how these lipids are transformed from land to sea and which environmental factors influence their distributions is lacking. Here, we investigate the sources of brGDGTs and brGMGTs and the factors controlling their distributions in a large dataset (n=237). We propose a novel proxy (RIX) to trace riverine runoff, which is applicable in modern systems and in paleorecord.
Youcheng Bai, Marie-Alexandrine Sicre, Jian Ren, Vincent Klein, Haiyan Jin, and Jianfang Chen
Biogeosciences, 21, 689–709, https://doi.org/10.5194/bg-21-689-2024, https://doi.org/10.5194/bg-21-689-2024, 2024
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Algal biomarkers were used to assess sea ice and pelagic algal production across the western Arctic Ocean with changing sea-ice conditions. They show three distinct areas along with a marked latitudinal gradient of sea ice over pelagic algal production in surface sediments that are reflected by the H-Print index. Our data also show that efficient grazing consumption accounted for the dramatic decrease of diatom-derived biomarkers in sediments compared to that of particulate matter.
Hanxiao Wang, Zhifei Liu, Jiaying Li, Baozhi Lin, Yulong Zhao, Xiaodong Zhang, Junyuan Cao, Jingwen Zhang, Hongzhe Song, and Wenzhuo Wang
Biogeosciences, 20, 5109–5123, https://doi.org/10.5194/bg-20-5109-2023, https://doi.org/10.5194/bg-20-5109-2023, 2023
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The sinking of zooplankton fecal pellets is a key process in the marine biological carbon pump. This study presents carbon export of four shapes of fecal pellets from two time-series sediment traps in the South China Sea. The results show that the sinking fate of fecal pellets is regulated by marine primary productivity, deep-dwelling zooplankton community, and deep-sea currents in the tropical marginal sea, thus providing a new perspective for exploring the carbon cycle in the world ocean.
Rebecca J. Chmiel, Riss M. Kell, Deepa Rao, Dawn M. Moran, Giacomo R. DiTullio, and Mak A. Saito
Biogeosciences, 20, 3997–4027, https://doi.org/10.5194/bg-20-3997-2023, https://doi.org/10.5194/bg-20-3997-2023, 2023
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Cobalt is an important micronutrient for plankton, yet it is often scarce throughout the oceans. A 2017/2018 expedition to coastal Antarctica, including regions of the Amundsen Sea and the Ross Sea, discovered lower concentrations of cobalt compared to two past expeditions in 2005 and 2006, particularly for the type of cobalt preferred as a nutrient by phytoplankton. This loss may be due to changing inputs of other nutrients, causing higher uptake of cobalt by plankton over the last decade.
Emily B. Graham, Hyun-Seob Song, Samantha Grieger, Vanessa A. Garayburu-Caruso, James C. Stegen, Kevin D. Bladon, and Allison N. Myers-Pigg
Biogeosciences, 20, 3449–3457, https://doi.org/10.5194/bg-20-3449-2023, https://doi.org/10.5194/bg-20-3449-2023, 2023
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Intensifying wildfires are increasing pyrogenic organic matter (PyOM) production and its impact on water quality. Recent work indicates that PyOM may have a greater impact on aquatic biogeochemistry than previously assumed, driven by higher bioavailability. We provide a full assessment of the potential bioavailability of PyOM across its chemical spectrum. We indicate that PyOM can be actively transformed within the river corridor and, therefore, may be a growing source of riverine C emissions.
Nora Richter, Ellen C. Hopmans, Danica Mitrović, Pedro M. Raposeiro, Vítor Gonçalves, Ana C. Costa, Linda A. Amaral-Zettler, Laura Villanueva, and Darci Rush
Biogeosciences, 20, 2065–2098, https://doi.org/10.5194/bg-20-2065-2023, https://doi.org/10.5194/bg-20-2065-2023, 2023
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Bacteriohopanepolyols (BHPs) are a diverse class of lipids produced by bacteria across a wide range of environments. This study characterizes the diversity of BHPs in lakes and coastal lagoons in the Azores Archipelago, as well as a co-culture enriched for methanotrophs. We highlight the potential of BHPs as taxonomic markers for bacteria associated with certain ecological niches, which can be preserved in sedimentary records.
Andrea Scheibe, Carlos A. Sierra, and Marie Spohn
Biogeosciences, 20, 827–838, https://doi.org/10.5194/bg-20-827-2023, https://doi.org/10.5194/bg-20-827-2023, 2023
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We explored carbon cycling in soils in three climate zones in Chile down to a depth of 6 m, using carbon isotopes. Our results show that microbial activity several meters below the soil surface is mostly fueled by recently fixed carbon and that strong decomposition of soil organic matter only occurs in the upper decimeters of the soils. The study shows that different layers of the critical zone are tightly connected and that processes in the deep soil depend on recently fixed carbon.
Melissa Sophia Schwab, Hannah Gies, Chantal Valérie Freymond, Maarten Lupker, Negar Haghipour, and Timothy Ian Eglinton
Biogeosciences, 19, 5591–5616, https://doi.org/10.5194/bg-19-5591-2022, https://doi.org/10.5194/bg-19-5591-2022, 2022
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The majority of river studies focus on headwater or floodplain systems, while often neglecting intermediate river segments. Our study on the subalpine Sihl River bridges the gap between streams and lowlands and demonstrates that moderately steep river segments are areas of significant instream alterations, modulating the export of organic carbon over short distances.
Lisa Noll, Shasha Zhang, Qing Zheng, Yuntao Hu, Florian Hofhansl, and Wolfgang Wanek
Biogeosciences, 19, 5419–5433, https://doi.org/10.5194/bg-19-5419-2022, https://doi.org/10.5194/bg-19-5419-2022, 2022
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Cleavage of proteins to smaller nitrogen compounds allows microorganisms and plants to exploit the largest nitrogen reservoir in soils and is considered the bottleneck in soil organic nitrogen cycling. Results from soils covering a European transect show that protein turnover is constrained by soil geochemistry, shifts in climate and associated alterations in soil weathering and should be considered as a driver of soil nitrogen availability with repercussions on carbon cycle processes.
Muhammed Fatih Sert, Helge Niemann, Eoghan P. Reeves, Mats A. Granskog, Kevin P. Hand, Timo Kekäläinen, Janne Jänis, Pamela E. Rossel, Bénédicte Ferré, Anna Silyakova, and Friederike Gründger
Biogeosciences, 19, 2101–2120, https://doi.org/10.5194/bg-19-2101-2022, https://doi.org/10.5194/bg-19-2101-2022, 2022
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We investigate organic matter composition in the Arctic Ocean water column. We collected seawater samples from sea ice to deep waters at six vertical profiles near an active hydrothermal vent and its plume. In comparison to seawater, we found that the organic matter in waters directly affected by the hydrothermal plume had different chemical composition. We suggest that hydrothermal processes may influence the organic matter distribution in the deep ocean.
Charlotte Haugk, Loeka L. Jongejans, Kai Mangelsdorf, Matthias Fuchs, Olga Ogneva, Juri Palmtag, Gesine Mollenhauer, Paul J. Mann, P. Paul Overduin, Guido Grosse, Tina Sanders, Robyn E. Tuerena, Lutz Schirrmeister, Sebastian Wetterich, Alexander Kizyakov, Cornelia Karger, and Jens Strauss
Biogeosciences, 19, 2079–2094, https://doi.org/10.5194/bg-19-2079-2022, https://doi.org/10.5194/bg-19-2079-2022, 2022
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Buried animal and plant remains (carbon) from the last ice age were freeze-locked in permafrost. At an extremely fast eroding permafrost cliff in the Lena Delta (Siberia), we found this formerly frozen carbon well preserved. Our results show that ongoing degradation releases substantial amounts of this carbon, making it available for future carbon emissions. This mobilisation at the studied cliff and also similarly eroding sites bear the potential to affect rivers and oceans negatively.
Aleksandar I. Goranov, Andrew S. Wozniak, Kyle W. Bostick, Andrew R. Zimmerman, Siddhartha Mitra, and Patrick G. Hatcher
Biogeosciences, 19, 1491–1514, https://doi.org/10.5194/bg-19-1491-2022, https://doi.org/10.5194/bg-19-1491-2022, 2022
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Wildfire-derived molecules are ubiquitous in the aquatic environment, but their biological fate remains understudied. We have evaluated the compositional changes that occur to wildfire-derived molecules after incubation with soil microbes. We observe a significant degradation but also a production of numerous new labile molecules. Our results indicate that wildfire-derived molecules can be broken down and the carbon and nitrogen therein can be incorporated into microbial food webs.
Edgart Flores, Sebastian I. Cantarero, Paula Ruiz-Fernández, Nadia Dildar, Matthias Zabel, Osvaldo Ulloa, and Julio Sepúlveda
Biogeosciences, 19, 1395–1420, https://doi.org/10.5194/bg-19-1395-2022, https://doi.org/10.5194/bg-19-1395-2022, 2022
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In this study, we investigate the chemical diversity and abundance of microbial lipids as markers of organic matter sources in the deepest points of the Atacama Trench sediments and compare them to similar lipid stocks in shallower surface sediments and in the overlying water column. We evaluate possible organic matter provenance and some potential chemical adaptations of the in situ microbial community to the extreme conditions of high hydrostatic pressure in hadal realm.
Birgit Gaye, Niko Lahajnar, Natalie Harms, Sophie Anna Luise Paul, Tim Rixen, and Kay-Christian Emeis
Biogeosciences, 19, 807–830, https://doi.org/10.5194/bg-19-807-2022, https://doi.org/10.5194/bg-19-807-2022, 2022
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Amino acids were analyzed in a large number of samples of particulate and dissolved organic matter from coastal regions and the open ocean. A statistical analysis produced two new biogeochemical indicators. An indicator of sinking particle and sediment degradation (SDI) traces the degradation of organic matter from the surface waters into the sediments. A second indicator shows the residence time of suspended matter in the ocean (RTI).
Zoë R. van Kemenade, Laura Villanueva, Ellen C. Hopmans, Peter Kraal, Harry J. Witte, Jaap S. Sinninghe Damsté, and Darci Rush
Biogeosciences, 19, 201–221, https://doi.org/10.5194/bg-19-201-2022, https://doi.org/10.5194/bg-19-201-2022, 2022
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Anaerobic ammonium oxidation (anammox) is an important nitrogen-removal process in the ocean. We assess the distribution of bacteriohopanetetrol-x (BHT-x), used to trace past anammox, along a redox gradient in the water column of the Benguela upwelling system. BHT-x / BHT ratios of >0.18 correspond to the presence of living anammox bacteria and oxygen levels <50 μmol L−1. This allows for a more robust application of BHT-x to trace past marine anammox and deoxygenation in dynamic marine systems.
Jia-Jang Hung, Ching-Han Tung, Zong-Ying Lin, Yuh-ling Lee Chen, Shao-Hung Peng, Yen-Huei Lin, and Li-Shan Tsai
Biogeosciences, 18, 5141–5162, https://doi.org/10.5194/bg-18-5141-2021, https://doi.org/10.5194/bg-18-5141-2021, 2021
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We report measured active and passive fluxes and their controlling mechanisms in the northern South China Sea (NSCS). The total fluxes were higher than most reports in open oceans, indicating the significance of NSCS in atmospheric CO2 uptake and in storing that CO2 in the ocean’s interior. Winter cooling and extreme events enhanced nutrient availability and elevated fluxes. Global warming may have profound impacts on reducing ocean’s uptake and storage of CO2 in subtropical–tropical oceans.
Jens Daniel Müller, Bernd Schneider, Ulf Gräwe, Peer Fietzek, Marcus Bo Wallin, Anna Rutgersson, Norbert Wasmund, Siegfried Krüger, and Gregor Rehder
Biogeosciences, 18, 4889–4917, https://doi.org/10.5194/bg-18-4889-2021, https://doi.org/10.5194/bg-18-4889-2021, 2021
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Based on profiling pCO2 measurements from a field campaign, we quantify the biomass production of a cyanobacteria bloom in the Baltic Sea, the export of which would foster deep water deoxygenation. We further demonstrate how this biomass production can be accurately reconstructed from long-term surface measurements made on cargo vessels in combination with modelled temperature profiles. This approach enables a better understanding of a severe concern for the Baltic’s good environmental status.
Alexander Braun, Marina Spona-Friedl, Maria Avramov, Martin Elsner, Federico Baltar, Thomas Reinthaler, Gerhard J. Herndl, and Christian Griebler
Biogeosciences, 18, 3689–3700, https://doi.org/10.5194/bg-18-3689-2021, https://doi.org/10.5194/bg-18-3689-2021, 2021
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It is known that CO2 fixation by photoautotrophic organisms is the major sink from the atmosphere. While biologists are aware that CO2 fixation also occurs in heterotrophic organisms, this route of inorganic carbon, and its quantitative role, is hardly recognized in biogeochemistry. We demonstrate that a considerable amount of CO2 is fixed annually through anaplerotic reactions in heterotrophic organisms, and a significant quantity of inorganic carbon is temporally sequestered in biomass.
Jonathan H. Raberg, David J. Harning, Sarah E. Crump, Greg de Wet, Aria Blumm, Sebastian Kopf, Áslaug Geirsdóttir, Gifford H. Miller, and Julio Sepúlveda
Biogeosciences, 18, 3579–3603, https://doi.org/10.5194/bg-18-3579-2021, https://doi.org/10.5194/bg-18-3579-2021, 2021
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BrGDGT lipids are a proxy for temperature in lake sediments, but other parameters like pH can influence them, and seasonality can affect the temperatures they record. We find a warm-season bias at 43 new high-latitude sites. We also present a new method that deconvolves the effects of temperature, pH, and conductivity and generate global calibrations for these variables. Our study provides new paleoclimate tools, insight into brGDGTs at the biochemical level, and a new method for future study.
Charlotte L. Spencer-Jones, Erin L. McClymont, Nicole J. Bale, Ellen C. Hopmans, Stefan Schouten, Juliane Müller, E. Povl Abrahamsen, Claire Allen, Torsten Bickert, Claus-Dieter Hillenbrand, Elaine Mawbey, Victoria Peck, Aleksandra Svalova, and James A. Smith
Biogeosciences, 18, 3485–3504, https://doi.org/10.5194/bg-18-3485-2021, https://doi.org/10.5194/bg-18-3485-2021, 2021
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Long-term ocean temperature records are needed to fully understand the impact of West Antarctic Ice Sheet collapse. Glycerol dialkyl glycerol tetraethers (GDGTs) are powerful tools for reconstructing ocean temperature but can be difficult to apply to the Southern Ocean. Our results show active GDGT synthesis in relatively warm depths of the ocean. This research improves the application of GDGT palaeoceanographic proxies in the Southern Ocean.
Alec W. Armstrong, Leanne Powers, and Michael Gonsior
Biogeosciences, 18, 3367–3390, https://doi.org/10.5194/bg-18-3367-2021, https://doi.org/10.5194/bg-18-3367-2021, 2021
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Living things decay into organic matter, which can dissolve into water (like tea brewing). Tea receives its color by absorbing light. Similarly, this material absorbs light, which can then cause chemical reactions that change it. By measuring changes in these optical properties, we found that materials from some places are more sensitive to light than others. Comparing sensitivity to light helps us understand where these materials come from and what happens as they move through water.
Ben J. Fisher, Johan C. Faust, Oliver W. Moore, Caroline L. Peacock, and Christian März
Biogeosciences, 18, 3409–3419, https://doi.org/10.5194/bg-18-3409-2021, https://doi.org/10.5194/bg-18-3409-2021, 2021
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Organic carbon can be protected from microbial degradation in marine sediments through association with iron minerals on 1000-year timescales. Despite the importance of this carbon sink, our spatial and temporal understanding of iron-bound organic carbon interactions globally is poor. Here we show that caution must be applied when comparing quantification of iron-bound organic carbon extracted by different methods as the extraction strength and method specificity can be highly variable.
Mark A. Stevenson, Suzanne McGowan, Emma J. Pearson, George E. A. Swann, Melanie J. Leng, Vivienne J. Jones, Joseph J. Bailey, Xianyu Huang, and Erika Whiteford
Biogeosciences, 18, 2465–2485, https://doi.org/10.5194/bg-18-2465-2021, https://doi.org/10.5194/bg-18-2465-2021, 2021
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We link detailed stable isotope and biomarker analyses from the catchments of three Arctic upland lakes on Disko Island (West Greenland) to a recent dated sediment core to understand how carbon cycling has changed over the past ~500 years. We find that the carbon deposited in sediments in these upland lakes is predominately sourced from in-lake production due to the catchment's limited terrestrial vegetation and elevation and that recent increases in algal production link with climate change.
Nadine T. Smit, Laura Villanueva, Darci Rush, Fausto Grassa, Caitlyn R. Witkowski, Mira Holzheimer, Adriaan J. Minnaard, Jaap S. Sinninghe Damsté, and Stefan Schouten
Biogeosciences, 18, 1463–1479, https://doi.org/10.5194/bg-18-1463-2021, https://doi.org/10.5194/bg-18-1463-2021, 2021
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Soils from an everlasting fire (gas seep) in Sicily, Italy, reveal high relative abundances of novel uncultivated mycobacteria and unique 13C-depleted mycocerosic acids (multi-methyl branched fatty acids) close to the main gas seep. Our results imply that mycocerosic acids in combination with their depleted δ13C values offer a new biomarker tool to study the role of soil mycobacteria as hydrocarbon consumers in the modern and past global carbon cycle.
Marcus P. S. Badger
Biogeosciences, 18, 1149–1160, https://doi.org/10.5194/bg-18-1149-2021, https://doi.org/10.5194/bg-18-1149-2021, 2021
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Reconstructing ancient atmospheric CO2 is an important aim of palaeoclimate science in order to understand the Earth's climate system. One method, the alkenone proxy based on molecular fossils of coccolithophores, has been recently shown to be ineffective at low-to-moderate CO2 levels. In this paper I show that this is likely due to changes in the biogeochemistry of the coccolithophores when there is low carbon availability, but for much of the Cenozoic the alkenone proxy should have utility.
Loes G. J. van Bree, Francien Peterse, Allix J. Baxter, Wannes De Crop, Sigrid van Grinsven, Laura Villanueva, Dirk Verschuren, and Jaap S. Sinninghe Damsté
Biogeosciences, 17, 5443–5463, https://doi.org/10.5194/bg-17-5443-2020, https://doi.org/10.5194/bg-17-5443-2020, 2020
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Branched glycerol dialkyl glycerol tetraethers (brGDGTs) are used as a paleothermometer based on their temperature dependence in global soils, but aquatic production complicates their use in lakes. BrGDGTs in the water column of Lake Chala, East Africa, respond to oxygen conditions and mixing. Changes in their signal can be linked to bacterial community composition rather than membrane adaptation to changing conditions. Their integrated signal in the sediment reflects mean air temperature.
Alexandra N. Loginova, Andrew W. Dale, Frédéric A. C. Le Moigne, Sören Thomsen, Stefan Sommer, David Clemens, Klaus Wallmann, and Anja Engel
Biogeosciences, 17, 4663–4679, https://doi.org/10.5194/bg-17-4663-2020, https://doi.org/10.5194/bg-17-4663-2020, 2020
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We measured dissolved organic carbon (DOC), nitrogen (DON) and matter (DOM) optical properties in pore waters and near-bottom waters of the eastern tropical South Pacific off Peru. The difference between diffusion-driven and net fluxes of DOC and DON and qualitative changes in DOM optical properties suggested active microbial utilisation of the released DOM at the sediment–water interface. Our results suggest that the sediment release of DOM contributes to microbial processes in the area.
Gerard J. M. Versteegh, Alexander J. P. Houben, and Karin A. F. Zonneveld
Biogeosciences, 17, 3545–3561, https://doi.org/10.5194/bg-17-3545-2020, https://doi.org/10.5194/bg-17-3545-2020, 2020
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Anoxic sediments mostly contain much more organic matter than oxic ones, and therefore organic matter in anoxic settings is often considered to be preserved better than in oxic settings. However, through the analysis of the same fossil dinoflagellate cyst species from both oxic and anoxic settings, we show that at a molecular level the preservation in the oxic sediments may be better since in the anoxic setting the cyst macromolecule has been altered by postdepositional modification.
Jingjing Guo, Miriam Glendell, Jeroen Meersmans, Frédérique Kirkels, Jack J. Middelburg, and Francien Peterse
Biogeosciences, 17, 3183–3201, https://doi.org/10.5194/bg-17-3183-2020, https://doi.org/10.5194/bg-17-3183-2020, 2020
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The fluxes of soil organic carbon (OC) transport from land to sea are poorly constrained, mostly due to the lack of a specific tracer for soil OC. Here we evaluate the use of specific molecules derived from soil bacteria as a tracer for soil OC in a small river catchment. We find that the initial soil signal is lost upon entering the aquatic environment. However, the local environmental history of the catchment is reflected by these molecules in the lake sediments that act as their sink.
Zhuo-Yi Zhu, Joanne Oakes, Bradley Eyre, Youyou Hao, Edwin Sien Aun Sia, Shan Jiang, Moritz Müller, and Jing Zhang
Biogeosciences, 17, 2473–2485, https://doi.org/10.5194/bg-17-2473-2020, https://doi.org/10.5194/bg-17-2473-2020, 2020
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Samples were collected in August 2016 in the Rajang River and its estuary, with tropical forest in the river basin and peatland in the estuary. Organic matter composition was influenced by transportation in the river basin, whereas peatland added clear biodegraded parts to the fluvial organic matter, which implies modification of the initial lability and/or starting points in the subsequent degradation and alternation processes after the organic matter enters the sea.
Wenjie Xiao, Yasong Wang, Yongsheng Liu, Xi Zhang, Linlin Shi, and Yunping Xu
Biogeosciences, 17, 2135–2148, https://doi.org/10.5194/bg-17-2135-2020, https://doi.org/10.5194/bg-17-2135-2020, 2020
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The hadal zone (6–11 km depth) is the least explored habitat on Earth. We studied microbial branched glycerol dialkyl glycerol tetraethers (brGDGTs) in the Challenger Deep, Mariana Trench. One unique feature is the strong predominance of 6-methyl brGDGT, which likely reflects an adaption of brGDGT-producing bacteria to alkaline seawater and low temperature. BrGDGTs, with elemental and isotopic data, suggest an autochthonous product for brGDGT. A new approach is proposed for brGDGT sourcing.
Yuge Bai, Edisson Subdiaga, Stefan B. Haderlein, Heike Knicker, and Andreas Kappler
Biogeosciences, 17, 683–698, https://doi.org/10.5194/bg-17-683-2020, https://doi.org/10.5194/bg-17-683-2020, 2020
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Biogeochemical processes of SOM are key for greenhouse gas emission and water quality. We extracted SOM by water or by NaOH–HCl under oxic–anoxic conditions. Chemical and anoxic extractions lead to higher SOM electron exchange capacities, resulting in stimulation of microbial Fe(III) reduction. Therefore, aqueous pH-neutral SOM extracts should be used to reflect environmental SOM redox processes, and artifacts of chemical extractions need to be considered when evaluating SOM redox processes.
Yan Shen, Volker Thiel, Pablo Suarez-Gonzalez, Sebastiaan W. Rampen, and Joachim Reitner
Biogeosciences, 17, 649–666, https://doi.org/10.5194/bg-17-649-2020, https://doi.org/10.5194/bg-17-649-2020, 2020
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Today, sterols are widespread in plants, animals, and fungi but are almost absent in the oldest rocks. Microbial mats, representing the earliest complex ecosystems on Earth, were omnipresent in Precambrian marine environments and may have degraded the sterols at that time. Here we analyze the distribution of sterols through a microbial mat. This provides insight into how variations in biological and nonbiological factors affect the preservation of sterols in modern and ancient microbial mats.
Sarah Coffinet, Travis B. Meador, Lukas Mühlena, Kevin W. Becker, Jan Schröder, Qing-Zeng Zhu, Julius S. Lipp, Verena B. Heuer, Matthew P. Crump, and Kai-Uwe Hinrichs
Biogeosciences, 17, 317–330, https://doi.org/10.5194/bg-17-317-2020, https://doi.org/10.5194/bg-17-317-2020, 2020
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This study deals with two membrane lipids called BDGTs and PDGTs. Membrane lipids are molecules forming the cell envelope of all organisms. Different organisms produce different lipids thus they can be used to detect the presence of specific organisms in the environment. We analyzed the structure of these new lipids and looked for potential producers. We found that they are likely made by microbes emitting methane below the sediment surface and could be used to track these specific microbes.
Ying Wu, Kun Zhu, Jing Zhang, Moritz Müller, Shan Jiang, Aazani Mujahid, Mohd Fakharuddin Muhamad, and Edwin Sien Aun Sia
Biogeosciences, 16, 4517–4533, https://doi.org/10.5194/bg-16-4517-2019, https://doi.org/10.5194/bg-16-4517-2019, 2019
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Our understanding of terrestrial organic matter (TOM) in tropical peat-draining rivers remains limited, especially in Southeast Asia. We explored the characteristics of TOM via bulk parameters and lignin phenols of sediment in Malaysia. This showed that the most important plant source of the organic matter in these rivers is woody angiosperm C3 plants with limited diagenetic alteration. This slower degradation of TOM may be a link to higher total nitrogen content, especially for the small river.
Caitlyn R. Witkowski, Sylvain Agostini, Ben P. Harvey, Marcel T. J. van der Meer, Jaap S. Sinninghe Damsté, and Stefan Schouten
Biogeosciences, 16, 4451–4461, https://doi.org/10.5194/bg-16-4451-2019, https://doi.org/10.5194/bg-16-4451-2019, 2019
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Carbon dioxide concentrations (pCO2) in the atmosphere play an integral role in Earth system dynamics, especially climate. Past climates help us understand future ones, but reconstructing pCO2 over the geologic record remains a challenge. This research demonstrates new approaches for exploring past pCO2 via the carbon isotope fractionation in general algal lipids, which we test over a high CO2 gradient from a naturally occurring CO2 seep.
Yongli Zhou, Patrick Martin, and Moritz Müller
Biogeosciences, 16, 2733–2749, https://doi.org/10.5194/bg-16-2733-2019, https://doi.org/10.5194/bg-16-2733-2019, 2019
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We found that peatlands in coastal Sarawak, Borneo, export extremely humified organic matter, which dominates the riverine organic matter pool and conservatively mixes with seawater, while the freshly produced fraction is low and stable in concentration at all salinities. We estimated that terrigenous fractions, which showed high photolability, still account for 20 % of the coastal dissolved organic carbon pool, implying the importance of peat-derived organic matter in the coastal carbon cycle.
Alexandra N. Loginova, Sören Thomsen, Marcus Dengler, Jan Lüdke, and Anja Engel
Biogeosciences, 16, 2033–2047, https://doi.org/10.5194/bg-16-2033-2019, https://doi.org/10.5194/bg-16-2033-2019, 2019
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High primary production in the Peruvian upwelling system is followed by rapid heterotrophic utilization of organic matter and supports the formation of one of the most intense oxygen minimum zones (OMZs) in the world. Here, we estimated vertical fluxes of oxygen and dissolved organic matter (DOM) from the surface to the OMZ. Our results suggest that DOM remineralization substantially reduces oxygen concentration in the upper water column and controls the shape of the upper oxycline.
Carolina Cisternas-Novoa, Frédéric A. C. Le Moigne, and Anja Engel
Biogeosciences, 16, 927–947, https://doi.org/10.5194/bg-16-927-2019, https://doi.org/10.5194/bg-16-927-2019, 2019
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We investigate the composition and vertical fluxes of POM in two deep basins of the Baltic Sea (GB: Gotland Basin and LD: Landsort Deep). The two basins showed different O2 regimes resulting from the intrusion of oxygen-rich water from the North Sea that ventilated the deep waters in GB, but not in LD.
In GB, O2 intrusions lead to a high abundance of manganese oxides that aggregate with POM, altering its composition and vertical flux and contributing to a higher POC transfer efficiency in GB.
Marina Zamanillo, Eva Ortega-Retuerta, Sdena Nunes, Pablo Rodríguez-Ros, Manuel Dall'Osto, Marta Estrada, Maria Montserrat Sala, and Rafel Simó
Biogeosciences, 16, 733–749, https://doi.org/10.5194/bg-16-733-2019, https://doi.org/10.5194/bg-16-733-2019, 2019
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Many marine microorganisms produce polysaccharide-rich transparent exopolymer particles (TEPs) for rather unknown reasons but with important consequences for the ocean carbon cycle, sea–air gas exchange and formation of organic aerosols. Here we compare surface–ocean distributions of TEPs and physical, chemical and biological variables along a N–S transect in the Atlantic Ocean. Our data suggest that phytoplankton and not bacteria are the main TEP producers, and solar radiation acts as a sink.
Cited articles
Abella-Gutiérrez, J. and Herguera, J. C.: Sensitivity of carbon
paleoproductivity in the Southern California Current System on different time
scales for the last 2 ka, Paleoceanography, 31, 953–970, https://doi.org/10.1002/2015PA002872,
2016.
Agnihotri, R., Altabet, M. A., and Herbert, T. D.: Influence of marine
denitrification on atmospheric
Agnihotri, R., Altabet, M. A., Herbert, T. D., and Tierney, J. E.:
Subdecadally resolved paleoceanography of the Peru margin during the last two
millennia, Geochem. Geophys. Geosyst., 9, Q05013,
https://doi.org/10.1029/2007GC001744, 2008.
Albarède, F., Telouk, P., Blichert-Toft, J., Boyet, M., Agranier,
A., and Nelson, B.: Precise and accurate isotopic measurements using
multiple-collector ICPMS, Geochim. Cosmochim. Acta, 68, 2725–2744,
https://doi.org/10.1016/j.gca.2003.11.024, 2004.
Altabet, M. A., Deuser, W. G., Honjo, S., and Stienen, C.: Seasonal and
Depth-Related Changes in the Source of Sinking Particles in the
North-Atlantic, Nature, 354, 136–139, 1991.
Barber, R. T. and Chávez, F. P.: Biological Consequences of El
Nino, Science, 222, 1203–1210, https://doi.org/10.1126/science.222.4629.1203,
1983.
Beucher, C. P., Brzezinski, M. A., and Jones, J. L.: Mechanisms controlling
silicon isotope distribution in the Eastern Equatorial Pacific, Geochim. Cosmochim. Acta, 75, 4286–4294, https://doi.org/10.1016/j.gca.2011.05.024, 2011.
Borlace, S., Cai, W., and Santoso, A.: Multi-decadal ENSO amplitude
variability in a 1000-year simulation of a coupled global climate model:
Implication for observed ENSO variability, J. Climate, 26, 9399–9407,
https://doi.org/10.1175/JCLI-D-13-00281.1, 2013.
Briceño-Zuluaga, F. J., Sifeddine, A., Caquineau, S., Cardich, J.,
Salvatteci, R., Gutierrez, D., Ortlieb, L., Velazco, F., Boucher, H., and
Machado, C.: Terrigenous material supply to the Peruvian central continental
shelf (Pisco, 14∘ S) during the last 1000 years: paleoclimatic
implications, Clim. Past, 12, 787–798,
https://doi.org/10.5194/cp-12-787-2016, 2016.
Brink, K. H., Halpern, D., Huyer, A., and Smith, R. L.: The
Physical-Environment of the Peruvian Upwelling System, Prog. Oceanogr., 12,
285–305, 1983.
Bruland, K. W., Rue, E. L., Smith, G. J., and DiTullio, G. R.: Iron,
macronutrients and diatom blooms in the Peru upwelling regime: brown and blue
waters of Peru, Mar. Chem., 93, 81–103, https://doi.org/10.1016/j.marchem.2004.06.011,
2005.
Brunelle, B. G., Sigman, D. M., Cook, M. S., Keigwin, L. D., Haug, G. H.,
Plessen, B., Schettler, G., and Jaccard, S. L.: Evidence from diatom-bound
nitrogen isotopes for subarctic Pacific stratification during the last ice
age and a link to North Pacific denitrification changes, Paleoceanography,
22, PA1215, https://doi.org/10.1029/2005PA001205, 2007.
Brzezinski, M. A.: The Si:C:N Ratio of Marine Diatoms: Interspecific
variability and the Effect of some Environmental Variables, J.
Phycol., 21, 347–357,
https://doi.org/10.1111/j.0022-3646.1985.00347.x, 1985.
Brzezinski, M. A.: A switch from Si(OH)4 to NO
Chaigneau, A., Dominguez, N., Eldin, G., Vasquez, L., Flores, R., Grados, C.,
and Echevin, V.: Near-coastal circulation in the Northern Humboldt Current
System from shipboard ADCP data, J. Geophys. Res.-Oceans, 118, 5251–5266,
https://doi.org/10.1002/jgrc.20328, 2013.
Chavez, F. P.: Size Distribution of phytoplankton in the central and eastern
tropical Pacific, Global Biogeochem. Cy., 3, 27–35,
https://doi.org/10.1029/GB003i001p00027, 1989.
Chiang, J. C. H. and Bitz, C. M.: Influence of high latitude ice cover on the
marine Intertropical Convergence Zone, Clim. Dyn., 25, 477–496,
https://doi.org/10.1007/s00382-005-0040-5, 2005.
Cline, J. D. and Kaplan, I. R.: Isotopic fractionation of dissolved nitrate
during denitrification in the eastern tropical North Pacific Ocean, Mar.
Chem., 3, 271–299, 1975.
Closset, I., Cardinal, D., Bray, S. G., Thil, F., Djouraev, I., Rigual-Hernández, A. S., and Trull, T. W.: Seasonal variations, origin, and fate of settling diatoms in the Southern Ocean tracked by silicon isotope records in deep sediment traps, Global Biogeochem. Cy., 29, 1495–1510, https://doi.org/10.1002/2015GB005180, 2015.
Codispoti, L. A.: An oceanic fixed nitrogen sink exceeding 400 Tg N a−1
vs the concept of homeostasis in the fixed-nitrogen inventory,
Biogeosciences, 4, 233–253, https://doi.org/10.5194/bg-4-233-2007,
2007.
Conley, D. J. and Malone, T. C.: Annual cycle of dissolved silicate in
Chesapeake Bay: implications for the production and fate of phytoplankton
biomass, Mar. Ecol. Prog. Ser., 81, 121–128, 1992.
De La Rocha, C. L., Brzezinski, M. A., and DeNiro, M. J.: Fractionation of
silicon isotopes by marine diatoms during biogenic silica formation,
Geochim. Cosmochim. Acta, 61, 5051–5056, 1997.
De La Rocha, C. L., Brzezinski, M. A., DeNiro, M. J., and Shemesh, A.:
Silicon-isotope composition of diatoms as an indicator of past oceanic
change, Nature, 395, 680–683, 1998.
De La Rocha, C. L., Hutchins, D. A., Brzezinski, M. A., and Zhang, Y.: Effects of iron and zinc deficiency on elemental composition and silica production by diatoms, Mar. Ecol. Prog. Ser., 195, 71–79, 2000.
Demarest, M. S., Brzezinski, M. A., and Beucher, C. P.: Fractionation of silicon isotopes during biogenic silica dissolution, Geochim. Cosmochim. Acta, 73, 5572–5583, https://doi.org/10.1016/j.gca.2009.06.019, 2009.
DeMaster, D. J.: The Supply and Accumulation of Silica in the
Marine-Environment, Geochim. Cosmochim. Acta, 45, 1715–1732,
1981.
De Pol-Holz, R., Ulloa, O., Lamy, F., Dezileau, L., Sabatier, P., and Hebbeln,
D.: Late Quaternary variability of sedimentary nitrogen isotopes in the
eastern South Pacific Ocean, Paleoceanography, 22, PA2207,
https://doi.org/10.1029/2006PA001308, 2007.
de Souza, G. F., Reynolds, B. C., Rickli, J., Frank, M., Saito, M. A.,
Gerringa, L. J. A., and Bourdon, B.: Southern Ocean control of silicon stable
isotope distribution in the deep Atlantic Ocean, Global Biogeochem. Cy.,
26, 2035–2047, https://doi.org/10.1029/2011GB004141, 2012.
Díaz-Ochoa, J. A., Lange, C. B., Pantoja, S., De Lange, G. J.,
Gutiérrez, D., Muñoz, P., and Salamanca, M.: Fish scales in sediments
from off Callao, central Peru, Deep Sea Res. Pt. II, 56, 1124–1135, https://doi.org/10.1016/j.dsr2.2008.09.015, 2009.
Doering, K., Ehlert, C., Grasse, P., Crosta, X., Fleury, S., Frank, M., and
Schneider, R.: Differences between mono-generic and mixed diatom silicon
isotope compositions trace present and past nutrient utilisation off Peru,
Geochim. Cosmochim. Acta, 177, 30–47,
https://doi.org/10.1016/j.gca.2015.12.029, 2016.
Doering, K., Ehlert, C., Martinez, P., Frank, M., and Schneider, R. R.: Stable Silicon Isotopes data and biogenic opal concentrations of Trigger cores M772-024, 005 and 003 off Peru, PANGAEA, https://doi.pangaea.de/10.1594/PANGAEA.901858, 2019.
Egan, K. E., Rickaby, R. E. M., Leng, M. J., Hendry, K. R., Hermoso, M., Sloane, H. J., Bostock, H., and Halliday, A. N.: Diatom silicon isotopes as a proxy for silicic acid utilisation: A Southern Ocean core top calibration, Geochim. Cosmochim. Acta, 96, 174–192, https://doi.org/10.1016/j.gca.2012.08.002, 2012.
Ehlert, C., Grasse, P., Mollier-Vogel, E., Böschen, T., Franz, J., de
Souza, G. F., Ben C Reynolds, Stramma, L., and Frank, M.: Factors controlling
the silicon isotope distribution in waters and surface sediments of the
Peruvian coastal upwelling, Geochim. Cosmochim. Acta, 99, 128–145,
https://doi.org/10.1016/j.gca.2012.09.038, 2012.
Ehlert, C., Grasse, P., and Frank, M.: Changes in silicate utilisation and
upwelling intensity off Peru since the Last Glacial Maximum - insights from
silicon and neodymium isotopes, Quaternary Sci. Rev., 72, 18–35,
https://doi.org/10.1016/j.quascirev.2013.04.013, 2013.
Ehlert, C., Grasse, P., Gutiérrez, D., Salvatteci, R., and Frank, M.:
Nutrient utilisation and weathering inputs in the Peruvian upwelling region
since the Little Ice Age, Clim. Past, 11, 187–202,
https://doi.org/10.5194/cp-11-187-2015, 2015.
Ehlert, C., Doering, K., Wallmann, K., Scholz, F., Sommer, S., Grasse, P., Geilert, S., and Frank, M.: Stable silicon isotope signatures of marine pore waters – Biogenic opal dissolution versus authigenic clay mineral formation, Geochim. Cosmochim. Acta, 191, 102–117, https://doi.org/10.1016/j.gca.2016.07.022, 2016.
England, M. H., McGregor, S., Spence, P., Meehl, G. A., Timmermann, A., Cai,
W., Gupta, A. S., McPhaden, M. J., Purich, A., and Santoso, A.: Recent
intensification of wind-driven circulation in the Pacific and the ongoing
warming hiatus, Nature Clim. Change, 4, 222–227, https://doi.org/10.1038/nclimate2106,
2014.
Espinoza-Morriberón, D., Echevin, V., Colas, F., Tam, J., Ledesma, J.,
Vásquez, L., and Graco, M.: Impacts of El Niño events on the Peruvian
upwelling system productivity, J. Geophys. Res.-Oceans, 115, 201,
https://doi.org/10.1002/2016JC012439, 2017.
Fleury, S., Martinez, P., Crosta, X., Charlier, K., Billy, I., Hanquiez, V.,
Blanz, T., and Schneider, R. R.: Pervasive multidecadal variations in
productivity within the Peruvian Upwelling System over the last millennium,
Quaternary Sci. Rev., 125, 78–90, https://doi.org/10.1016/j.quascirev.2015.08.006, 2015.
Fleury, S., Crosta, X., Schneider, R., Blanz, T., Ther, O., and Martinez, P.:
Centennial-scale variations in diatom productivity off Peru over the last
3000 years, Holocene, 26, 520–531, https://doi.org/10.1177/0959683615612589, 2016.
François, R., Altabet, M. A., and Burckle, L. H.: Glacial to interglacial
changes in surface nitrate utilization in the Indian sector of the Southern
Ocean as recorded by sediment δ15N, Paleoceanography, 7, 589–606,
1992.
Fripiat, F., Cavagna, A.-J., Dehairs, F., de Brauwere, A., André, L., and Cardinal, D.: Processes controlling the Si-isotopic composition in the Southern Ocean and application for paleoceanography, Biogeosciences, 9, 2443–2457, https://doi.org/10.5194/bg-9-2443-2012, 2012.
Grasse, P., Ehlert, C., and Frank, M.: The influence of water mass mixing on
the dissolved Si isotope composition in the Eastern Equatorial Pacific, Earth
Planet. Sc. Lett., 380, 60–71, https://doi.org/10.1016/j.epsl.2013.07.033, 2013.
Grasse, P., Ryabenko, E., Ehlert, C., Altabet, M. A., and Frank, M.: Silicon
and nitrogen cycling in the upwelling area off Peru: A dual isotope approach,
Limnol. Oceangr., 61, 1661–1676, https://doi.org/10.1002/lno.10324, 2016.
Gutiérrez, D., Sifeddine, A., Field, D. B., Ortlieb, L., Vargas, G.,
Chávez, F. P., Velazco, F., Ferreira, V., Tapia, P., Salvatteci, R.,
Boucher, H., Morales, M. C., Valdés, J., Reyss, J.-L., Campusano, A.,
Boussafir, M., Mandeng-Yogo, M., García, M., and Baumgartner, T.: Rapid
reorganization in ocean biogeochemistry off Peru towards the end of the
Little Ice Age, Biogeosciences, 6, 835–848,
https://doi.org/10.5194/bg-6-835-2009, 2009.
Gutiérrez, D., Bouloubassi, I., and Sifeddine, A.: Coastal cooling and
increased productivity in the main upwelling zone off Peru since the
mid-twentieth century, Geophys. Res. Lett., 38, L07603,
https://doi.org/10.1029/2010GL046324, 2011.
Haug, G. H., Hughen, K. A., Sigman, D. M., Peterson, L. C., and Röhl, U.:
Southward Migration of the Intertropical Convergence Zone Through the
Holocene, Science, 293, 1304–1308, https://doi.org/10.1126/science.1059725, 2001.
Horn, M. G., Beucher, C. P., Robinson, R. S., and Brzezinski, M. A.: Southern
ocean nitrogen and silicon dynamics during the last deglaciation, Earth
Planet. Sc. Lett., 310, 334–339, https://doi.org/10.1016/j.epsl.2011.08.016, 2011.
Hutchins, D. A. and Bruland, K. W.: Iron-limited diatom growth and Si: N
uptake ratios in a coastal upwelling regime, Nature, 393, 561–564, 1998.
Kosaka, Y. and Xie, S.-P.: Recent global-warming hiatus tied to equatorial
Pacific surface cooling, Nature, 501, 403, https://doi.org/10.1038/nature12534, 2013.
Lam, P., Lavik, G., Jensen, M. M., van de Vossenberg, J., Schmid, M.,
Woebken, D., Gutiérrez, D., Amann, R., Jetten, M. S., and Kuypers, M. M.:
Revising the nitrogen cycle in the Peruvian oxygen minimum zone, P. Natl.
Acad. Sci., 106, 4752–4757, 2009.
Linsley, B. K., Dunbar, R. B., Wellington, G. M., and Mucciarone, D. A.: A
coral-based reconstruction of Intertropical Convergence Zone variability over
Central America since 1707, J. Geophys. Res.-Oceans, 99, 9977–9994,
https://doi.org/10.1029/94JC00360, 1994.
Mann, M. E., Bradley, R. S., and Hughes, M. K.: Northern hemisphere
temperatures during the past millennium: Inferences, uncertainties, and
limitations, Geophys. Res. Lett., 26, 759–762, https://doi.org/10.1029/1999GL900070,
1999.
Mann, M. E., Zhang, Z., Rutherford, S., Bradley, R. S., Hughes, M. K.,
Shindell, D., Ammann, C., Faluvegi, G., and Ni, F.: Global Signatures and
Dynamical Origins of the Little Ice Age and Medieval Climate Anomaly,
Science, 326, 1256–1260, https://doi.org/10.1126/science.1177303, 2009.
Mariotti, A., Germon, J. C., Hubert, P., Kaiser, P., Letolle, R., Tardieux,
A., and Tardieux, P.: Experimental determination of nitrogen kinetic isotope
fractionation: some principles; illustration for the denitrification and
nitrification processes, Plant Soil, 62, 413–430, 1981.
Mollier-Vogel, E., Ryabenko, E., Martinez, P., Wallace, D., Altabet, M. A.,
and Schneider, R.: Nitrogen isotope gradients off Peru and Ecuador related to
upwelling, productivity, nutrient uptake and oxygen deficiency, Deep-Sea Res.
Pt. I, 70, 14–25, https://doi.org/10.1016/j.dsr.2012.06.003, 2012.
Morón, A. O.: Características del ambiente marino frente a la costa
peruana, Bol. Inst. Mar Peru, 19, 179–204, 2000.
Müller, P. J. and Schneider, R.: An Automated Leaching Method for the
Determination of Opal in Sediments and Particulate Matter, Deep-Sea Res. Pt.
I, 40, 425–444, 1993.
Pennington, J. T., Mahoney, K. L., Kuwahara, V. S., Kolber, D. D., Calienes,
R., and Chavez, F. P.: Primary production in the eastern tropical Pacific: A
review, Prog. Oceanogr., 69, 285–317, https://doi.org/10.1016/j.pocean.2006.03.012,
2006.
Peterson, L. C. and Haug, G. H.: Variability in the mean latitude of the
Atlantic Intertropical Convergence Zone as recorded by riverine input of
sediments to the Cariaco Basin (Venezuela), Paleogeogr. Paleoclimatol.
Paleoecol., 234, 97–113, https://doi.org/10.1016/j.palaeo.2005.10.021, 2006.
Picaut, J., Ioualalen, M., Menkes, C., Delcroix, T., and McPhaden, M. J.:
Mechanism of the Zonal Displacements of the Pacific Warm Pool: Implications
for ENSO, Science, 274), 1486–1489, https://doi.org/10.1126/science.274.5292.1486, 1996.
Pichevin, L., Martinez, P., Bertrand, P., Schneider, R., Giraudeau, J., and
Emeis, K.: Nitrogen cycling on the Namibian shelf and slope over the last two
climatic cycles: Local and global forcings, Paleoceanography, 20, PA2006,
https://doi.org/10.1029/2004PA001001, 2005.
Rafter, P. A. and Sigman, D. M.: Spatial distribution and temporal variation
of nitrate nitrogen and oxygen isotopes in the upper equatorial Pacific
Ocean, Limnol. Oceangr., 61, 14–31, https://doi.org/10.1002/lno.10152, 2016.
Rafter, P. A., Sigman, D. M., Charles, C. D., Kaiser, J., and Haug, G. H.:
Subsurface tropical Pacific nitrogen isotopic composition of nitrate:
Biogeochemical signals and their transport, Global Biogeochem. Cy., 26,
GB1003, https://doi.org/10.1029/2010GB003979, 2012.
Ragueneau, O., Tréguer, P., Leynaert, A., Anderson, R. F., Brzezinski, M.
A., DeMaster, D. J., Dugdale, R. C., Dymond, J., Fischer, G., and Francois,
R.: A review of the Si cycle in the modern ocean: recent progress and missing
gaps in the application of biogenic opal as a paleoproductivity proxy, Global
Planet. Change, 26, 317–365, 2000.
Rein, B.: A major Holocene ENSO anomaly during the Medieval period, Geophys.
Res. Lett., 31, L17211, https://doi.org/10.1029/2004GL020161, 2004.
Reynolds, B. C., Frank, M., and Halliday, A. N.: Evidence for a major change
in silicon cycling in the subarctic North Pacific at 2.73 Ma,
Paleoceanography, 23, PA4219, https://doi.org/10.1029/2007PA001563, 2008.
Robinson, R. S., Brzezinski, M. A., Beucher, C. P., Horn, M. G. S., and
Bedsole, P.: The changing roles of iron and vertical mixing in regulating
nitrogen and silicon cycling in the Southern Ocean over the last glacial
cycle, Paleoceanography, 29, 1179–1195, https://doi.org/10.1002/2014PA002686, 2014.
Rustic, G. T., Koutavas, A., Marchitto, T. M., and Linsley, B. K.: Dynamical
excitation of the tropical Pacific Ocean and ENSO variability by Little Ice
Age cooling, Science, 350, 1537–1541, https://doi.org/10.1126/science.aac9937, 2015.
Sachs, J. P., Sachse, D., Smittenberg, R. H., Zhang, Z., Battisti, D. S., and
Golubic, S.: Southward movement of the Pacific intertropical convergence zone
AD 1400–1850, Nature Geosci., 2, 519–525, https://doi.org/10.1038/ngeo554, 2009.
Salvatteci, R., Field, D., Sifeddine, A., Ortlieb, L., Ferreira, V.,
Baumgartner, T., Caquineau, S., Velazco, F., Reyss, J.-L., Sanchez-Cabeza, J.
A., and Gutiérrez, D.: Cross-stratigraphies from a seismically active mud
lens off Peru indicate horizontal extensions of laminae, missing sequences,
and a need for multiple cores for high resolution records, Mar. Geol., 357,
72–89, https://doi.org/10.1016/j.margeo.2014.07.008, 2014a.
Salvatteci, R., Gutiérrez, D., Field, D., Sifeddine, A., Ortlieb, L.,
Bouloubassi, I., Boussafir, M., Boucher, H., and Cetin, F.: The response of
the Peruvian Upwelling Ecosystem to centennial-scale global change during the
last two millennia, Clim. Past, 10, 715–731,
https://doi.org/10.5194/cp-10-715-2014, 2014b.
Sanchez, G., Calienes, R., and Zuta, S.: The 1997–98 El Niño and its
effects on the coastal marine ecosystem off Peru, Reports of California
Cooperative Oceanic Fisheries Investigations, 41, 62–86, 2000.
Schneider, T., Bischoff, T., and Haug, G. H.: Migrations and dynamics of the
intertropical convergence zone, Nature, 513, 45, https://doi.org/10.1038/nature13636,
2014.
Sifeddine, A., Gutiérrez, D., Ortlieb, L., Boucher, H., Velazco, F.,
Field, D., Vargas, G., Boussafir, M., Salvatteci, R., Ferreira, V.,
García, M., Valdés, J., Caquineau, S., Mandeng Yogo, M., Cetin, F.,
Solis, J., Soler, P., and Baumgartner, T.: Laminated sediments from the
central Peruvian continental slope: A 500 year record of upwelling system
productivity, terrestrial runoff and redox conditions, Prog. Oceanogr., 79,
190–197, https://doi.org/10.1016/j.pocean.2008.10.024, 2008.
Sutton, J. N., Varela, D. E., Brzezinski, M. A., and Beucher, C. P.: Species-dependent silicon isotope fractionation by marine diatoms, Geochim. Cosmochim. Acta, 104, 300–309, https://doi.org/10.1016/j.gca.2012.10.057, 2013.
Toggweiler, J. R., Dixon, K., and Broecker, W. S.: The Peru Upwelling and the
Ventilation of the South-Pacific Thermocline, J. Geophys. Res., 96,
20467–20497, 1991.
Varela, D. E., Pride, C. J., and Brzezinski, M. A.: Biological fractionation of silicon isotopes in Southern Ocean surface waters, Global Biogeochem. Cy., 18, 1047–1054, https://doi.org/10.1029/2003GB002140, 2004.
Wada, E. and Hattori, A.: Nitrogen isotope effects in the assimilation of
inorganic nitrogenous compounds by marine diatoms, Geomicrobiol. J., 1,
85–101, https://doi.org/10.1080/01490457809377725, 1978.
Waser, N., Harrison, P. J., Nielsen, B., Calvert, S. E., and Turpin, D. H.:
Nitrogen isotope fractionation during the uptake and assimilation of nitrate,
nitrite, ammonium, and urea by a marine diatom, Limnol. Oceangr., 43,
215–224, 1998.
Wetzel, F., de Souza, G. F., and Reynolds, B. C.: What controls silicon isotope fractionation during dissolution of diatom opal?, Geochim. Cosmochim. Acta, 131, 128–137, https://doi.org/10.1016/j.gca.2014.01.028, 2014.
Wilken, S., Hoffmann, B., Hersch, N., Kirchgessner, N., Dieluweit, S., Rubner, W., Hoffmann, L. J., Merkel, R., and Peeken, I.: Diatom frustules show increased mechanical strength and altered valve morphology under iron limitation, Limnol. Oceangr., 56, 1399–1410, https://doi.org/10.4319/lo.2011.56.4.1399, 2011.
Wilkerson, F. P. and Dugdale, R. C.: Silicate versus nitrate limitation in
the equatorial Pacific estimated from satellite-derived sea-surface
temperatures, Adv. Space Res., 18, 81–89, 1996.
Yan, H., Sun, L., Oppo, D. W., Wang, Y., Liu, Z., Xie, Z., Liu, X., and
Cheng, W.: South China Sea hydrological changes and Pacific Walker
Circulation variations over the last millennium, Nat. Comms., 2, 293,
https://doi.org/10.1038/ncomms1297, 2011.
Zuta, S. and Guillén, O.: Oceanografía de las aguas costeras del
Perú, Bo. Inst. Mar. Perú, 2, 157–324, 1970.
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