Articles | Volume 19, issue 24
https://doi.org/10.5194/bg-19-5667-2022
© Author(s) 2022. 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-19-5667-2022
© Author(s) 2022. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Research article
| 
14 Dec 2022
Research article |
| 14 Dec 2022
Interannual variability of the initiation of the phytoplankton growing period in two French coastal ecosystems
Coline Poppeschi
CORRESPONDING AUTHOR
Ifremer, Univ. Brest, CNRS, IRD, Laboratory for Ocean Physics and
Satellite remote sensing (LOPS), IUEM, 29280 Brest, France
Guillaume Charria
Ifremer, Univ. Brest, CNRS, IRD, Laboratory for Ocean Physics and
Satellite remote sensing (LOPS), IUEM, 29280 Brest, France
Anne Daniel
Ifremer, DYNECO, Pelagic Ecology Laboratory (PELAGOS), 29280 Brest,
France
Romaric Verney
Ifremer, DYNECO, Hydrosedimentary Dynamics Laboratory (DHYSED), 29280
Brest, France
Peggy Rimmelin-Maury
OSU-European University Institute of the Sea (IUEM), UMS3113, 29280
Plouzané, France
Michaël Retho
Ifremer, Morbihan-Pays de Loire Environment Resources Laboratory
(LERMPL), 56100 Lorient, France
Eric Goberville
Unité Biologie des Organismes et Ecosystèmes Aquatiques
(BOREA), Muséum National d'Histoire Naturelle, CNRS, IRD, Sorbonne
Université, Université de Caen Normandie, Université des
Antilles, Paris, France
Emilie Grossteffan
OSU-European University Institute of the Sea (IUEM), UMS3113, 29280
Plouzané, France
Martin Plus
Ifremer, DYNECO, Pelagic Ecology Laboratory (PELAGOS), 29280 Brest,
France
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Amélie Simon, Coline Poppeschi, Sandra Plecha, Guillaume Charria, and Ana Russo
Ocean Sci., 19, 1339–1355, https://doi.org/10.5194/os-19-1339-2023, https://doi.org/10.5194/os-19-1339-2023, 2023
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In the coastal northeastern Atlantic and for three subregions (the English Channel, Bay of Brest and Bay of Biscay) over the period 1982–2022, marine heatwaves are more frequent and longer and extend over larger areas, while the opposite is seen for marine cold spells. This result is obtained with both in situ and satellite datasets, although the satellite dataset underestimates the amplitude of these extremes.
Sébastien Petton, Fabrice Pernet, Valérian Le Roy, Matthias Huber, Sophie Martin, Eric Macé, Yann Bozec, Stéphane Loisel, Peggy Rimmelin-Maury, Emilie Grossteffan, Michel Repecaud, Loïc Quemener, Michael Retho, Saozig Manac'h, Mathias Papin, Philippe Pineau, Thomas Lacoue-Labarthe, Jonathan Deborde, Louis Costes, Pierre Polsenaere, Loïc Rigouin, Jérémy Benhamou, Laure Gouriou, Joséphine Lequeux, Nathalie Labourdette, Nicolas Savoye, Grégory Messiaen, Elodie Foucault, Vincent Ouisse, Marion Richard, Franck Lagarde, Florian Voron, Valentin Kempf, Sébastien Mas, Léa Giannecchini, Francesca Vidussi, Behzad Mostajir, Yann Leredde, Samir Alliouane, Jean-Pierre Gattuso, and Frédéric Gazeau
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Preprint under review for ESSD
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Our research highlights the concerning impact of rising carbon dioxide levels on coastal areas. To better understand these changes, we've established an observation network in France. By deploying pH sensors and other monitoring equipment at key coastal sites, we're gaining valuable insights into how various factors, such as freshwater inputs, tides, temperature, and biological processes, influence ocean pH.
Raed Halawi Ghosn, Émilie Poisson-Caillault, Guillaume Charria, Armel Bonnat, Michel Repecaud, Jean-Valery Facq, Loïc Quéméner, Vincent Duquesne, Camille Blondel, and Alain Lefebvre
Earth Syst. Sci. Data, 15, 4205–4218, https://doi.org/10.5194/essd-15-4205-2023, https://doi.org/10.5194/essd-15-4205-2023, 2023
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This article describes a long-term (2004–2022) dataset from an in situ instrumented station located in the eastern English Channel and belonging to the COAST-HF network (ILICO). It provides high temporal resolution (sub-hourly) oceanographic and meteorological measurements. The MAREL Carnot dataset can be used to conduct research in marine ecology, oceanography, and data science. It was utilized to characterize recurrent, rare, and extreme events in the coastal area.
Amélie Simon, Coline Poppeschi, Sandra Plecha, Guillaume Charria, and Ana Russo
Ocean Sci., 19, 1339–1355, https://doi.org/10.5194/os-19-1339-2023, https://doi.org/10.5194/os-19-1339-2023, 2023
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In the coastal northeastern Atlantic and for three subregions (the English Channel, Bay of Brest and Bay of Biscay) over the period 1982–2022, marine heatwaves are more frequent and longer and extend over larger areas, while the opposite is seen for marine cold spells. This result is obtained with both in situ and satellite datasets, although the satellite dataset underestimates the amplitude of these extremes.
Valentin Siebert, Brivaëla Moriceau, Lukas Fröhlich, Bernd R. Schöne, Erwan Amice, Beatriz Beker, Kevin Bihannic, Isabelle Bihannic, Gaspard Delebecq, Jérémy Devesa, Morgane Gallinari, Yoan Germain, Émilie Grossteffan, Klaus Peter Jochum, Thierry Le Bec, Manon Le Goff, Céline Liorzou, Aude Leynaert, Claudie Marec, Marc Picheral, Peggy Rimmelin-Maury, Marie-Laure Rouget, Matthieu Waeles, and Julien Thébault
Earth Syst. Sci. Data, 15, 3263–3281, https://doi.org/10.5194/essd-15-3263-2023, https://doi.org/10.5194/essd-15-3263-2023, 2023
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This article presents an overview of the results of biological, chemical and physical parameters measured at high temporal resolution (sampling once and twice per week) during environmental monitoring that took place in 2021 in the Bay of Brest. We strongly believe that this dataset could be very useful for other scientists performing sclerochronological investigations, studying biogeochemical cycles or conducting various ecological research projects.
Widya Ratmaya, Dominique Soudant, Jordy Salmon-Monviola, Martin Plus, Nathalie Cochennec-Laureau, Evelyne Goubert, Françoise Andrieux-Loyer, Laurent Barillé, and Philippe Souchu
Biogeosciences, 16, 1361–1380, https://doi.org/10.5194/bg-16-1361-2019, https://doi.org/10.5194/bg-16-1361-2019, 2019
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This work reports the consequences of nutrient management strategy, an example from southwestern Europe focused mainly on P reduction. Upstream rivers reveal indices of recoveries following the significant diminution of P, while eutrophication continues to increase downstream, especially when N is the limiting factor. This long-term ecosystem-scale analysis provides more arguments for a dual-nutrient (N and P) management strategy to mitigate eutrophication along the freshwater–marine continuum.
Géraldine Sarthou, Pascale Lherminier, Eric P. Achterberg, Fernando Alonso-Pérez, Eva Bucciarelli, Julia Boutorh, Vincent Bouvier, Edward A. Boyle, Pierre Branellec, Lidia I. Carracedo, Nuria Casacuberta, Maxi Castrillejo, Marie Cheize, Leonardo Contreira Pereira, Daniel Cossa, Nathalie Daniault, Emmanuel De Saint-Léger, Frank Dehairs, Feifei Deng, Floriane Desprez de Gésincourt, Jérémy Devesa, Lorna Foliot, Debany Fonseca-Batista, Morgane Gallinari, Maribel I. García-Ibáñez, Arthur Gourain, Emilie Grossteffan, Michel Hamon, Lars Eric Heimbürger, Gideon M. Henderson, Catherine Jeandel, Catherine Kermabon, François Lacan, Philippe Le Bot, Manon Le Goff, Emilie Le Roy, Alison Lefèbvre, Stéphane Leizour, Nolwenn Lemaitre, Pere Masqué, Olivier Ménage, Jan-Lukas Menzel Barraqueta, Herlé Mercier, Fabien Perault, Fiz F. Pérez, Hélène F. Planquette, Frédéric Planchon, Arnout Roukaerts, Virginie Sanial, Raphaëlle Sauzède, Catherine Schmechtig, Rachel U. Shelley, Gillian Stewart, Jill N. Sutton, Yi Tang, Nadine Tisnérat-Laborde, Manon Tonnard, Paul Tréguer, Pieter van Beek, Cheryl M. Zurbrick, and Patricia Zunino
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Karine Leblanc, Véronique Cornet, Peggy Rimmelin-Maury, Olivier Grosso, Sandra Hélias-Nunige, Camille Brunet, Hervé Claustre, Joséphine Ras, Nathalie Leblond, and Bernard Quéguiner
Biogeosciences, 15, 5595–5620, https://doi.org/10.5194/bg-15-5595-2018, https://doi.org/10.5194/bg-15-5595-2018, 2018
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The Si biogeochemical cycle was studied during two oceanographic cruises in the tropical South Pacific in 2005 and 2015, between New Caledonia and the Chilean upwelling (8–34° S). Some of the lowest levels of biogenic silica stocks were found in the southern Pacific gyre, where Chlorophyll a concentrations are most depleted worldwide. Size-fractionated biogenic silica concentrations as well as Si kinetic uptake experiments revealed biological Si uptake by the picoplanktonic size fraction.
Christopher R. Sherwood, Alfredo L. Aretxabaleta, Courtney K. Harris, J. Paul Rinehimer, Romaric Verney, and Bénédicte Ferré
Geosci. Model Dev., 11, 1849–1871, https://doi.org/10.5194/gmd-11-1849-2018, https://doi.org/10.5194/gmd-11-1849-2018, 2018
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Cohesive sediment (mud) is ubiquitous in the world's coastal regions, but its behavior is complicated and often oversimplified by computer models. This paper describes extensions to a widely used open-source coastal ocean model that allow users to simulate important components of cohesive sediment transport.
Guillaume Charria, Sébastien Theetten, Frédéric Vandermeirsch, Özge Yelekçi, and Nicole Audiffren
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In the north-east Atlantic Ocean, the Bay of Biscay is an intersection between a coastal constrained dynamics (wide continental shelf and shelf break regions) and an eastern boundary circulation system. Based on a 10-year simulation using the coastal ocean model at high resolution (1 km), the interannual variability of small-scale dynamics has been described, implying a potential significant impact on vertical and horizontal mixing in this region.
Related subject area
Biogeochemistry: Coastal Ocean
Multiple nitrogen sources for primary production inferred from δ13C and δ15N in the southern Sea of Japan
Influence of manganese cycling on alkalinity in the redox stratified water column of Chesapeake Bay
Estuarine flocculation dynamics of organic carbon and metals from boreal acid sulfate soils
Influence of a small submarine canyon on biogenic matter export flux in the Lower St. Lawrence Estuary, eastern Canada
Drivers of particle sinking velocities in the Peruvian upwelling system
Impacts and uncertainties of climate-induced changes in watershed inputs on estuarine hypoxia
Considerations for hypothetical carbon dioxide removal via alkalinity addition in the Amazon River watershed
Revisiting the applicability and constraints of molybdenum and uranium-based paleo redox proxies: comparing two contrasting sill fjords
High metabolism and periodic hypoxia associated with drifting macrophyte detritus in the shallow subtidal Baltic Sea
Single-celled bioturbators: benthic foraminifera mediate oxygen penetration and prokaryotic diversity in intertidal sediment
Production and accumulation of reef framework by calcifying corals and macroalgae on a remote Indian Ocean cay
Zooplankton community succession and trophic links during a mesocosm experiment in the coastal upwelling off Callao Bay (Peru)
Temporal and spatial evolution of bottom-water hypoxia in the St Lawrence estuarine system
Significant nutrient consumption in the dark subsurface layer during a diatom bloom: a case study on Funka Bay, Hokkaido, Japan
Contrasts in dissolved, particulate, and sedimentary organic carbon from the Kolyma River to the East Siberian Shelf
Sediment quality assessment in an industrialized Greek coastal marine area (western Saronikos Gulf)
Limits and CO2 equilibration of near-coast alkalinity enhancement
Role of phosphorus in the seasonal deoxygenation of the East China Sea shelf
Observed and projected impacts of coastal warming, acidification, and deoxygenation on Pacific oyster (Crassostrea gigas) farming: A case study in the Hinase Area, Okayama Prefecture and Shizugawa Bay, Miyagi Prefecture, Japan
Spatio-temporal distribution, photoreactivity and environmental control of dissolved organic matter in the sea-surface microlayer of the eastern marginal seas of China
Metabolic alkalinity release from large port facilities (Hamburg, Germany) and impact on coastal carbon storage
A Numerical reassessment of the Gulf of Mexico carbon system in connection with the Mississippi River and global ocean
Observed and projected global warming pressure on coastal hypoxia
Benthic alkalinity fluxes from coastal sediments of the Baltic and North seas: comparing approaches and identifying knowledge gaps
Investigating the effect of nickel concentration on phytoplankton growth to assess potential side-effects of ocean alkalinity enhancement
Unprecedented summer hypoxia in southern Cape Cod Bay: an ecological response to regional climate change?
Interannual variabilities, long-term trends, and regulating factors of low-oxygen conditions in the coastal waters off Hong Kong
Causes of the extensive hypoxia in the Gulf of Riga in 2018
Trawling effects on biogeochemical processes are mediated by fauna in high-energy biogenic-reef-inhabited coastal sediments
Drought recorded by Ba∕Ca in coastal benthic foraminifera
A nitrate budget of the Bohai Sea based on an isotope mass balance model
Suspended particulate matter drives the spatial segregation of nitrogen turnover along the hyper-turbid Ems estuary
Marine CO2 system variability along the northeast Pacific Inside Passage determined from an Alaskan ferry
Reviews and syntheses: Spatial and temporal patterns in seagrass metabolic fluxes
Mixed layer depth dominates over upwelling in regulating the seasonality of ecosystem functioning in the Peruvian upwelling system
Temporal dynamics of surface ocean carbonate chemistry in response to natural and simulated upwelling events during the 2017 coastal El Niño near Callao, Peru
Pelagic primary production in the coastal Mediterranean Sea: variability, trends, and contribution to basin-scale budgets
Contrasting patterns of carbon cycling and dissolved organic matter processing in two phytoplankton–bacteria communities
Biophysical controls on seasonal changes in the structure, growth, and grazing of the size-fractionated phytoplankton community in the northern South China Sea
Seasonal dispersal of fjord meltwaters as an important source of iron and manganese to coastal Antarctic phytoplankton
Modeling cyanobacteria life cycle dynamics and historical nitrogen fixation in the Baltic Proper
Simultaneous assessment of oxygen- and nitrate-based net community production in a temperate shelf sea from a single ocean glider
Reviews and syntheses: Physical and biogeochemical processes associated with upwelling in the Indian Ocean
Particulate organic carbon dynamics in the Gulf of Lion shelf (NW Mediterranean) using a coupled hydrodynamic–biogeochemical model
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Long-term spatiotemporal variations in and expansion of low-oxygen conditions in the Pearl River estuary: a study synthesizing observations during 1976–2017
Fe-binding organic ligands in coastal and frontal regions of the western Antarctic Peninsula
Temporal variability and driving factors of the carbonate system in the Aransas Ship Channel, TX, USA: a time series study
Nitrogen loss processes in response to upwelling in a Peruvian coastal setting dominated by denitrification – a mesocosm approach
Retracing hypoxia in Eckernförde Bight (Baltic Sea)
Taketoshi Kodama, Atsushi Nishimoto, Ken-ichi Nakamura, Misato Nakae, Naoki Iguchi, Yosuke Igeta, and Yoichi Kogure
Biogeosciences, 20, 3667–3682, https://doi.org/10.5194/bg-20-3667-2023, https://doi.org/10.5194/bg-20-3667-2023, 2023
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Carbon and nitrogen are essential elements for organisms; their stable isotope ratios (13C : 12C, 15N : 14N) are useful tools for understanding turnover and movement in the ocean. In the Sea of Japan, the environment is rapidly being altered by human activities. The 13C : 12C of small organic particles is increased by active carbon fixation, and phytoplankton growth increases the values. The 15N : 14N variations suggest that nitrates from many sources contribute to organic production.
Aubin Thibault de Chanvalon, George W. Luther, Emily R. Estes, Jennifer Necker, Bradley M. Tebo, Jianzhong Su, and Wei-Jun Cai
Biogeosciences, 20, 3053–3071, https://doi.org/10.5194/bg-20-3053-2023, https://doi.org/10.5194/bg-20-3053-2023, 2023
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The intensity of the oceanic trap of CO2 released by anthropogenic activities depends on the alkalinity brought by continental weathering. Between ocean and continent, coastal water and estuaries can limit or favour the alkalinity transfer. This study investigate new interactions between dissolved metals and alkalinity in the oxygen-depleted zone of estuaries.
Joonas J. Virtasalo, Peter Österholm, and Eero Asmala
Biogeosciences, 20, 2883–2901, https://doi.org/10.5194/bg-20-2883-2023, https://doi.org/10.5194/bg-20-2883-2023, 2023
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We mixed acidic metal-rich river water from acid sulfate soils and seawater in the laboratory to study the flocculation of dissolved metals and organic matter in estuaries. Al and Fe flocculated already at a salinity of 0–2 to large organic flocs (>80 µm size). Precipitation of Al and Fe hydroxide flocculi (median size 11 µm) began when pH exceeded ca. 5.5. Mn transferred weakly to Mn hydroxides and Co to the flocs. Up to 50 % of Cu was associated with the flocs, irrespective of seawater mixing.
Hannah Sharpe, Michel Gosselin, Catherine Lalande, Alexandre Normandeau, Jean-Carlos Montero-Serrano, Khouloud Baccara, Daniel Bourgault, Owen Sherwood, and Audrey Limoges
EGUsphere, https://doi.org/10.5194/egusphere-2023-1538, https://doi.org/10.5194/egusphere-2023-1538, 2023
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We studied the impact of submarine canyon processes within the Pointe-des-Monts system on biogenic matter export and phytoplankton assemblages. Using data from three oceanographic moorings, we show that the canyon experienced two low-amplitude sediment remobilization events in 2020–2021, that led to enhanced particle fluxes in the deep-water column layer >2.6 km offshore. Sinking phytoplankton fluxes were lower near the canyon compared to background values from the Lower St. Lawrence Estuary.
Moritz Baumann, Allanah Joy Paul, Jan Taucher, Lennart Thomas Bach, Silvan Goldenberg, Paul Stange, Fabrizio Minutolo, and Ulf Riebesell
Biogeosciences, 20, 2595–2612, https://doi.org/10.5194/bg-20-2595-2023, https://doi.org/10.5194/bg-20-2595-2023, 2023
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The sinking velocity of marine particles affects how much atmospheric CO2 is stored inside our oceans. We measured particle sinking velocities in the Peruvian upwelling system and assessed their physical and biochemical drivers. We found that sinking velocity was mainly influenced by particle size and porosity, while ballasting minerals played only a minor role. Our findings help us to better understand the particle sinking dynamics in this highly productive marine system.
Kyle E. Hinson, Marjorie A. M. Friedrichs, Raymond G. Najjar, Maria Herrmann, Zihao Bian, Gopal Bhatt, Pierre St-Laurent, Hanqin Tian, and Gary Shenk
Biogeosciences, 20, 1937–1961, https://doi.org/10.5194/bg-20-1937-2023, https://doi.org/10.5194/bg-20-1937-2023, 2023
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Climate impacts are essential for environmental managers to consider when implementing nutrient reduction plans designed to reduce hypoxia. This work highlights relative sources of uncertainty in modeling regional climate impacts on the Chesapeake Bay watershed and consequent declines in bay oxygen levels. The results demonstrate that planned water quality improvement goals are capable of reducing hypoxia levels by half, offsetting climate-driven impacts on terrestrial runoff.
Linquan Mu, Jaime B. Palter, and Hongjie Wang
Biogeosciences, 20, 1963–1977, https://doi.org/10.5194/bg-20-1963-2023, https://doi.org/10.5194/bg-20-1963-2023, 2023
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Enhancing ocean alkalinity accelerates carbon dioxide removal from the atmosphere. We hypothetically added alkalinity to the Amazon River and examined the increment of the carbon uptake by the Amazon plume. We also investigated the minimum alkalinity addition in which this perturbation at the river mouth could be detected above the natural variability.
K. Mareike Paul, Martijn Hermans, Sami A. Jokinen, Inda Brinkmann, Helena L. Filipsson, and Tom Jilbert
Biogeosciences Discuss., https://doi.org/10.5194/bg-2023-83, https://doi.org/10.5194/bg-2023-83, 2023
Revised manuscript accepted for BG
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The coastal seafloor naturally contains trace metals, which are sensitive to changes in oxygen concentrations in seawater: trace metal contents increase with decreasing oxygen concentrations. Studies have used those trace metals as indicators for declining oxygen concentrations in coastal waters. Here we show that in fjords, this relationship works well on longer (decadal) time scales but poorly on shorter (seasonal) time scales. We attribute this to other processes influencing the trace metals.
Karl M. Attard, Anna Lyssenko, and Iván F. Rodil
Biogeosciences, 20, 1713–1724, https://doi.org/10.5194/bg-20-1713-2023, https://doi.org/10.5194/bg-20-1713-2023, 2023
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Aquatic plants produce a large amount of organic matter through photosynthesis that, following erosion, is deposited on the seafloor. In this study, we show that plant detritus can trigger low-oxygen conditions (hypoxia) in shallow coastal waters, making conditions challenging for most marine animals. We propose that the occurrence of hypoxia may be underestimated because measurements typically do not consider the region closest to the seafloor, where detritus accumulates.
Dewi Langlet, Florian Mermillod-Blondin, Noémie Deldicq, Arthur Bauville, Gwendoline Duong, Lara Konecny, Mylène Hugoni, Lionel Denis, and Vincent M. P. Bouchet
EGUsphere, https://doi.org/10.5194/egusphere-2023-705, https://doi.org/10.5194/egusphere-2023-705, 2023
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Benthic foraminifera are single cell marine organisms which can move in the sediment column. They were previously reported to horizontally and vertically transport sediment particles, yet the impact of their motion on the dissolved fluxes remains unknown. Using microprofiling we here show that foraminiferal burrow formation increase the oxygen penetration depth in the sediment. Leading to a change in the structure of the prokaryotic community.
M. James McLaughlin, Cindy Bessey, Gary A. Kendrick, John Keesing, and Ylva S. Olsen
Biogeosciences, 20, 1011–1026, https://doi.org/10.5194/bg-20-1011-2023, https://doi.org/10.5194/bg-20-1011-2023, 2023
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Coral reefs face increasing pressures from environmental change at present. The coral reef framework is produced by corals and calcifying algae. The Kimberley region of Western Australia has escaped land-based anthropogenic impacts. Specimens of the dominant coral and algae were collected from Browse Island's reef platform and incubated in mesocosms to measure calcification and production patterns of oxygen. This study provides important data on reef building and climate-driven effects.
Patricia Ayón Dejo, Elda Luz Pinedo Arteaga, Anna Schukat, Jan Taucher, Rainer Kiko, Helena Hauss, Sabrina Dorschner, Wilhelm Hagen, Mariona Segura-Noguera, and Silke Lischka
Biogeosciences, 20, 945–969, https://doi.org/10.5194/bg-20-945-2023, https://doi.org/10.5194/bg-20-945-2023, 2023
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Ocean upwelling regions are highly productive. With ocean warming, severe changes in upwelling frequency and/or intensity and expansion of accompanying oxygen minimum zones are projected. In a field experiment off Peru, we investigated how different upwelling intensities affect the pelagic food web and found failed reproduction of dominant zooplankton. The changes projected could severely impact the reproductive success of zooplankton communities and the pelagic food web in upwelling regions.
Mathilde Jutras, Alfonso Mucci, Gwenaëlle Chaillou, William A. Nesbitt, and Douglas W. R. Wallace
Biogeosciences, 20, 839–849, https://doi.org/10.5194/bg-20-839-2023, https://doi.org/10.5194/bg-20-839-2023, 2023
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The deep waters of the lower St Lawrence Estuary and gulf have, in the last decades, experienced a strong decline in their oxygen concentration. Below 65 µmol L-1, the waters are said to be hypoxic, with dire consequences for marine life. We show that the extent of the hypoxic zone shows a seven-fold increase in the last 20 years, reaching 9400 km2 in 2021. After a stable period at ~ 65 µmol L⁻¹ from 1984 to 2019, the oxygen level also suddenly decreased to ~ 35 µmol L-1 in 2020.
Sachi Umezawa, Manami Tozawa, Yuichi Nosaka, Daiki Nomura, Hiroji Onishi, Hiroto Abe, Tetsuya Takatsu, and Atsushi Ooki
Biogeosciences, 20, 421–438, https://doi.org/10.5194/bg-20-421-2023, https://doi.org/10.5194/bg-20-421-2023, 2023
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We conducted repetitive observations in Funka Bay, Japan, during the spring bloom 2019. We found nutrient concentration decreases in the dark subsurface layer during the bloom. Incubation experiments confirmed that diatoms could consume nutrients at a substantial rate, even in darkness. We concluded that the nutrient reduction was mainly caused by nutrient consumption by diatoms in the dark.
Dirk Jong, Lisa Bröder, Tommaso Tesi, Kirsi H. Keskitalo, Nikita Zimov, Anna Davydova, Philip Pika, Negar Haghipour, Timothy I. Eglinton, and Jorien E. Vonk
Biogeosciences, 20, 271–294, https://doi.org/10.5194/bg-20-271-2023, https://doi.org/10.5194/bg-20-271-2023, 2023
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With this study, we want to highlight the importance of studying both land and ocean together, and water and sediment together, as these systems function as a continuum, and determine how organic carbon derived from permafrost is broken down and its effect on global warming. Although on the one hand it appears that organic carbon is removed from sediments along the pathway of transport from river to ocean, it also appears to remain relatively ‘fresh’, despite this removal and its very old age.
Georgia Filippi, Manos Dassenakis, Vasiliki Paraskevopoulou, and Konstantinos Lazogiannis
Biogeosciences, 20, 163–189, https://doi.org/10.5194/bg-20-163-2023, https://doi.org/10.5194/bg-20-163-2023, 2023
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The pollution of the western Saronikos Gulf from heavy metals has been examined through the study of marine sediment cores. It is a deep gulf (maximum depth 440 m) near Athens affected by industrial and volcanic activity. Eight cores were received from various stations and depths and analysed for their heavy metal content and geochemical characteristics. The results were evaluated by using statistical methods, environmental indicators and comparisons with old data.
Jing He and Michael D. Tyka
Biogeosciences, 20, 27–43, https://doi.org/10.5194/bg-20-27-2023, https://doi.org/10.5194/bg-20-27-2023, 2023
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Recently, ocean alkalinity enhancement (OAE) has gained interest as a scalable way to address the urgent need for negative CO2 emissions. In this paper we examine the capacity of different coastlines to tolerate alkalinity enhancement and the time scale of CO2 uptake following the addition of a given quantity of alkalinity. The results suggest that OAE has significant potential and identify specific favorable and unfavorable coastlines for its deployment.
Arnaud Laurent, Haiyan Zhang, and Katja Fennel
Biogeosciences, 19, 5893–5910, https://doi.org/10.5194/bg-19-5893-2022, https://doi.org/10.5194/bg-19-5893-2022, 2022
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The Changjiang is the main terrestrial source of nutrients to the East China Sea (ECS). Nutrient delivery to the ECS has been increasing since the 1960s, resulting in low oxygen (hypoxia) during phytoplankton decomposition in summer. River phosphorus (P) has increased less than nitrogen, and therefore, despite the large nutrient delivery, phytoplankton growth can be limited by the lack of P. Here, we investigate this link between P limitation, phytoplankton production/decomposition, and hypoxia.
Masahiko Fujii, Ryuji Hamanoue, Lawrence Patrick Cases Bernardo, Tsuneo Ono, Akihiro Dazai, Shigeyuki Oomoto, Masahide Wakita, and Takehiro Tanaka
Biogeosciences Discuss., https://doi.org/10.5194/bg-2022-223, https://doi.org/10.5194/bg-2022-223, 2022
Revised manuscript accepted for BG
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This is the first study of the current and future impacts of climate change on Pacific oyster farming in Japan. Future coastal warming and acidification may affect oyster larvae, as a result of longer exposure to lower pH waters. A prolonged spawning period may harm oyster processing by shortening the shipping period and reducing oyster quality. To minimize impacts on Pacific oyster farming, in addition to mitigation measures, local adaptation measures may be required.
Lin Yang, Jing Zhang, Anja Engel, and Gui-Peng Yang
Biogeosciences, 19, 5251–5268, https://doi.org/10.5194/bg-19-5251-2022, https://doi.org/10.5194/bg-19-5251-2022, 2022
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Enrichment factors of dissolved organic matter (DOM) in the eastern marginal seas of China exhibited a significant spatio-temporal variation. Photochemical and enrichment processes co-regulated DOM enrichment in the sea-surface microlayer (SML). Autochthonous DOM was more frequently enriched in the SML than terrestrial DOM. DOM in the sub-surface water exhibited higher aromaticity than that in the SML.
Mona Norbisrath, Johannes Pätsch, Kirstin Dähnke, Tina Sanders, Gesa Schulz, Justus E. E. van Beusekom, and Helmuth Thomas
Biogeosciences, 19, 5151–5165, https://doi.org/10.5194/bg-19-5151-2022, https://doi.org/10.5194/bg-19-5151-2022, 2022
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Total alkalinity (TA) regulates the oceanic storage capacity of atmospheric CO2. TA is also metabolically generated in estuaries and influences coastal carbon storage through its inflows. We used water samples and identified the Hamburg port area as the one with highest TA generation. Of the overall riverine TA load, 14 % is generated within the estuary. Using a biogeochemical model, we estimated potential effects on the coastal carbon storage under possible anthropogenic and climate changes.
Le Zhang and Z. George Xue
Biogeosciences, 19, 4589–4618, https://doi.org/10.5194/bg-19-4589-2022, https://doi.org/10.5194/bg-19-4589-2022, 2022
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We adopt a high-resolution carbon model for the Gulf of Mexico (GoM) and calculate the decadal trends of important carbon system variables in the GoM from 2001 to 2019. The GoM surface CO2 values experienced a steady increase over the past 2 decades, and the ocean surface pH is declining. Although carbonate saturation rates remain supersaturated with aragonite, they show a slightly decreasing trend. The northern GoM is a stronger carbon sink than we thought.
Michael M. Whitney
Biogeosciences, 19, 4479–4497, https://doi.org/10.5194/bg-19-4479-2022, https://doi.org/10.5194/bg-19-4479-2022, 2022
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Coastal hypoxia is a major environmental problem of increasing severity. The 21st-century projections analyzed indicate global coastal waters will warm and experience rapid declines in oxygen. The forecasted median coastal trends for increasing sea surface temperature and decreasing oxygen capacity are 48 % and 18 % faster than the rates observed over the last 4 decades. Existing hypoxic areas are expected to worsen, and new hypoxic areas likely will emerge under these warming-related pressures.
Bryce Van Dam, Nele Lehmann, Mary A. Zeller, Andreas Neumann, Daniel Pröfrock, Marko Lipka, Helmuth Thomas, and Michael Ernst Böttcher
Biogeosciences, 19, 3775–3789, https://doi.org/10.5194/bg-19-3775-2022, https://doi.org/10.5194/bg-19-3775-2022, 2022
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We quantified sediment–water exchange at shallow sites in the North and Baltic seas. We found that porewater irrigation rates in the former were approximately twice as high as previously estimated, likely driven by relatively high bioirrigative activity. In contrast, we found small net fluxes of alkalinity, ranging from −35 µmol m−2 h−1 (uptake) to 53 µmol m−2 h−1 (release). We attribute this to low net denitrification, carbonate mineral (re-)precipitation, and sulfide (re-)oxidation.
Jiaying Abby Guo, Robert Strzepek, Anusuya Willis, Aaron Ferderer, and Lennart Thomas Bach
Biogeosciences, 19, 3683–3697, https://doi.org/10.5194/bg-19-3683-2022, https://doi.org/10.5194/bg-19-3683-2022, 2022
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Ocean alkalinity enhancement is a CO2 removal method with significant potential, but it can lead to a perturbation of the ocean with trace metals such as nickel. This study tested the effect of increasing nickel concentrations on phytoplankton growth and photosynthesis. We found that the response to nickel varied across the 11 phytoplankton species tested here, but the majority were rather insensitive. We note, however, that responses may be different under other experimental conditions.
Malcolm E. Scully, W. Rockwell Geyer, David Borkman, Tracy L. Pugh, Amy Costa, and Owen C. Nichols
Biogeosciences, 19, 3523–3536, https://doi.org/10.5194/bg-19-3523-2022, https://doi.org/10.5194/bg-19-3523-2022, 2022
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For two consecutive summers, the bottom waters in southern Cape Cod Bay became severely depleted of dissolved oxygen. Low oxygen levels in bottom waters have never been reported in this area before, and this unprecedented occurrence is likely the result of a new algae species that recently began blooming during the late-summer months. We present data suggesting that blooms of this new species are the result of regional climate change including warmer waters and changes in summer winds.
Zheng Chen, Bin Wang, Chuang Xu, Zhongren Zhang, Shiyu Li, and Jiatang Hu
Biogeosciences, 19, 3469–3490, https://doi.org/10.5194/bg-19-3469-2022, https://doi.org/10.5194/bg-19-3469-2022, 2022
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Deterioration of low-oxygen conditions in the coastal waters off Hong Kong was revealed by monitoring data over two decades. The declining wind forcing and the increasing nutrient input contributed significantly to the areal expansion and intense deterioration of low-oxygen conditions. Also, the exacerbated eutrophication drove a shift in the dominant source of organic matter from terrestrial inputs to in situ primary production, which has probably led to an earlier onset of hypoxia in summer.
Stella-Theresa Stoicescu, Jaan Laanemets, Taavi Liblik, Māris Skudra, Oliver Samlas, Inga Lips, and Urmas Lips
Biogeosciences, 19, 2903–2920, https://doi.org/10.5194/bg-19-2903-2022, https://doi.org/10.5194/bg-19-2903-2022, 2022
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Coastal basins with high input of nutrients often suffer from oxygen deficiency. In summer 2018, the extent of oxygen depletion was exceptional in the Gulf of Riga. We analyzed observational data and found that extensive oxygen deficiency appeared since the water layer close to the seabed, where oxygen is consumed, was separated from the surface layer. The problem worsens if similar conditions restricting vertical transport of oxygen occur more frequently in the future.
Justin C. Tiano, Jochen Depestele, Gert Van Hoey, João Fernandes, Pieter van Rijswijk, and Karline Soetaert
Biogeosciences, 19, 2583–2598, https://doi.org/10.5194/bg-19-2583-2022, https://doi.org/10.5194/bg-19-2583-2022, 2022
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This study gives an assessment of bottom trawling on physical, chemical, and biological characteristics in a location known for its strong currents and variable habitats. Although trawl gears only removed the top 1 cm of the seabed surface, impacts on reef-building tubeworms significantly decreased carbon and nutrient cycling. Lighter trawls slightly reduced the impact on fauna and nutrients. Tubeworms were strongly linked to biogeochemical and faunal aspects before but not after trawling.
Inda Brinkmann, Christine Barras, Tom Jilbert, Tomas Næraa, K. Mareike Paul, Magali Schweizer, and Helena L. Filipsson
Biogeosciences, 19, 2523–2535, https://doi.org/10.5194/bg-19-2523-2022, https://doi.org/10.5194/bg-19-2523-2022, 2022
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The concentration of the trace metal barium (Ba) in coastal seawater is a function of continental input, such as riverine discharge. Our geochemical records of the severely hot and dry year 2018, and following wet year 2019, reveal that prolonged drought imprints with exceptionally low Ba concentrations in benthic foraminiferal calcium carbonates of coastal sediments. This highlights the potential of benthic Ba / Ca to trace past climate extremes and variability in coastal marine records.
Shichao Tian, Birgit Gaye, Jianhui Tang, Yongming Luo, Wenguo Li, Niko Lahajnar, Kirstin Dähnke, Tina Sanders, Tianqi Xiong, Weidong Zhai, and Kay-Christian Emeis
Biogeosciences, 19, 2397–2415, https://doi.org/10.5194/bg-19-2397-2022, https://doi.org/10.5194/bg-19-2397-2022, 2022
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We constrain the nitrogen budget and in particular the internal sources and sinks of nitrate in the Bohai Sea by using a mass-based and dual stable isotope approach based on δ15N and δ18O of nitrate. Based on available mass fluxes and isotope data an updated nitrogen budget is proposed. Compared to previous estimates, it is more complete and includes the impact of the interior cycle (nitrification) on the nitrate pool. The main external nitrogen sources are rivers contributing 19.2 %–25.6 %.
Gesa Schulz, Tina Sanders, Justus E. E. van Beusekom, Yoana G. Voynova, Andreas Schöl, and Kirstin Dähnke
Biogeosciences, 19, 2007–2024, https://doi.org/10.5194/bg-19-2007-2022, https://doi.org/10.5194/bg-19-2007-2022, 2022
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Estuaries can significantly alter nutrient loads before reaching coastal waters. Our study of the heavily managed Ems estuary (Northern Germany) reveals three zones of nitrogen turnover along the estuary with water-column denitrification in the most upstream hyper-turbid part, nitrate production in the middle reaches and mixing/nitrate uptake in the North Sea. Suspended particulate matter was the overarching control on nitrogen cycling in the hyper-turbid estuary.
Wiley Evans, Geoffrey T. Lebon, Christen D. Harrington, Yuichiro Takeshita, and Allison Bidlack
Biogeosciences, 19, 1277–1301, https://doi.org/10.5194/bg-19-1277-2022, https://doi.org/10.5194/bg-19-1277-2022, 2022
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Information on the marine carbon dioxide system along the northeast Pacific Inside Passage has been limited. To address this gap, we instrumented an Alaskan ferry in order to characterize the marine carbon dioxide system in this region. Data over a 2-year period were used to assess drivers of the observed variability, identify the timing of severe conditions, and assess the extent of contemporary ocean acidification as well as future levels consistent with a 1.5 °C warmer climate.
Melissa Ward, Tye L. Kindinger, Heidi K. Hirsh, Tessa M. Hill, Brittany M. Jellison, Sarah Lummis, Emily B. Rivest, George G. Waldbusser, Brian Gaylord, and Kristy J. Kroeker
Biogeosciences, 19, 689–699, https://doi.org/10.5194/bg-19-689-2022, https://doi.org/10.5194/bg-19-689-2022, 2022
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Here, we synthesize the results from 62 studies reporting in situ rates of seagrass metabolism to highlight spatial and temporal variability in oxygen fluxes and inform efforts to use seagrass to mitigate ocean acidification. Our analyses suggest seagrass meadows are generally autotrophic and variable in space and time, and the effects on seawater oxygen are relatively small in magnitude.
Tianfei Xue, Ivy Frenger, A. E. Friederike Prowe, Yonss Saranga José, and Andreas Oschlies
Biogeosciences, 19, 455–475, https://doi.org/10.5194/bg-19-455-2022, https://doi.org/10.5194/bg-19-455-2022, 2022
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The Peruvian system supports 10 % of the world's fishing yield. In the Peruvian system, wind and earth’s rotation bring cold, nutrient-rich water to the surface and allow phytoplankton to grow. But observations show that it grows worse at high upwelling. Using a model, we find that high upwelling happens when air mixes the water the most. Then phytoplankton is diluted and grows slowly due to low light and cool upwelled water. This study helps to estimate how it might change in a warming climate.
Shao-Min Chen, Ulf Riebesell, Kai G. Schulz, Elisabeth von der Esch, Eric P. Achterberg, and Lennart T. Bach
Biogeosciences, 19, 295–312, https://doi.org/10.5194/bg-19-295-2022, https://doi.org/10.5194/bg-19-295-2022, 2022
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Oxygen minimum zones in the ocean are characterized by enhanced carbon dioxide (CO2) levels and are being further acidified by increasing anthropogenic atmospheric CO2. Here we report CO2 system measurements in a mesocosm study offshore Peru during a rare coastal El Niño event to investigate how CO2 dynamics may respond to ongoing ocean deoxygenation. Our observations show that nitrogen limitation, productivity, and plankton community shift play an important role in driving the CO2 dynamics.
Paula Maria Salgado-Hernanz, Aurore Regaudie-de-Gioux, David Antoine, and Gotzon Basterretxea
Biogeosciences, 19, 47–69, https://doi.org/10.5194/bg-19-47-2022, https://doi.org/10.5194/bg-19-47-2022, 2022
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For the first time, this study presents the characteristics of primary production in coastal regions of the Mediterranean Sea based on satellite-borne observations for the period 2002–2016. The study concludes that there are significant spatial and temporal variations among different regions. Quantifying primary production is of special importance in the marine food web and in the sequestration of carbon dioxide from the atmosphere to the deep waters.
Samu Elovaara, Eeva Eronen-Rasimus, Eero Asmala, Tobias Tamelander, and Hermanni Kaartokallio
Biogeosciences, 18, 6589–6616, https://doi.org/10.5194/bg-18-6589-2021, https://doi.org/10.5194/bg-18-6589-2021, 2021
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Dissolved organic matter (DOM) is a significant carbon pool in the marine environment. The composition of the DOM pool, as well as its interaction with microbes, is complex, yet understanding it is important for understanding global carbon cycling. This study shows that two phytoplankton species have different effects on the composition of the DOM pool and, through the DOM they produce, on the ensuing microbial community. These communities in turn have different effects on DOM composition.
Yuan Dong, Qian P. Li, Zhengchao Wu, Yiping Shuai, Zijia Liu, Zaiming Ge, Weiwen Zhou, and Yinchao Chen
Biogeosciences, 18, 6423–6434, https://doi.org/10.5194/bg-18-6423-2021, https://doi.org/10.5194/bg-18-6423-2021, 2021
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Temporal change of plankton growth and grazing are less known in the coastal ocean, not to mention the relevant controlling mechanisms. Here, we performed monthly size-specific dilution experiments outside a eutrophic estuary over a 1-year cycle. Phytoplankton growth was correlated to nutrients and grazing mortality to total chlorophyll a. A selective grazing on small cells may be important for maintaining high abundance of large-chain-forming diatoms in this eutrophic system.
Kiefer O. Forsch, Lisa Hahn-Woernle, Robert M. Sherrell, Vincent J. Roccanova, Kaixuan Bu, David Burdige, Maria Vernet, and Katherine A. Barbeau
Biogeosciences, 18, 6349–6375, https://doi.org/10.5194/bg-18-6349-2021, https://doi.org/10.5194/bg-18-6349-2021, 2021
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We show that for an unperturbed cold western Antarctic Peninsula fjord, the seasonality of iron and manganese is linked to the dispersal of metal-rich meltwater sources. Geochemical measurements of trace metals in meltwaters, porewaters, and seawater, collected during two expeditions, showed a seasonal cycle of distinct sources. Finally, model results revealed that the dispersal of surface meltwater and meltwater plumes originating from under the glacier is sensitive to katabatic wind events.
Jenny Hieronymus, Kari Eilola, Malin Olofsson, Inga Hense, H. E. Markus Meier, and Elin Almroth-Rosell
Biogeosciences, 18, 6213–6227, https://doi.org/10.5194/bg-18-6213-2021, https://doi.org/10.5194/bg-18-6213-2021, 2021
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Dense blooms of cyanobacteria occur every summer in the Baltic Proper and can add to eutrophication by their ability to turn nitrogen gas into dissolved inorganic nitrogen. Being able to correctly estimate the size of this nitrogen fixation is important for management purposes. In this work, we find that the life cycle of cyanobacteria plays an important role in capturing the seasonality of the blooms as well as the size of nitrogen fixation in our ocean model.
Tom Hull, Naomi Greenwood, Antony Birchill, Alexander Beaton, Matthew Palmer, and Jan Kaiser
Biogeosciences, 18, 6167–6180, https://doi.org/10.5194/bg-18-6167-2021, https://doi.org/10.5194/bg-18-6167-2021, 2021
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The shallow shelf seas play a large role in the global cycling of CO2 and also support large fisheries. We use an autonomous underwater vehicle in the central North Sea to measure the rates of change in oxygen and nutrients.
Using these data we determine the amount of carbon dioxide taken out of the atmosphere by the sea and measure how productive the region is.
These observations will be useful for improving our predictive models and help us predict and adapt to a changing ocean.
Puthenveettil Narayana Menon Vinayachandran, Yukio Masumoto, Michael J. Roberts, Jenny A. Huggett, Issufo Halo, Abhisek Chatterjee, Prakash Amol, Garuda V. M. Gupta, Arvind Singh, Arnab Mukherjee, Satya Prakash, Lynnath E. Beckley, Eric Jorden Raes, and Raleigh Hood
Biogeosciences, 18, 5967–6029, https://doi.org/10.5194/bg-18-5967-2021, https://doi.org/10.5194/bg-18-5967-2021, 2021
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Upwelling in the coastal ocean triggers biological productivity and thus enhances fisheries. Therefore, understanding the phenomenon of upwelling and the underlying mechanisms is important. In this paper, the present understanding of the upwelling along the coastline of the Indian Ocean from the coast of Africa all the way up to the coast of Australia is reviewed. The review provides a synthesis of the physical processes associated with upwelling and its impact on the marine ecosystem.
Gaël Many, Caroline Ulses, Claude Estournel, and Patrick Marsaleix
Biogeosciences, 18, 5513–5538, https://doi.org/10.5194/bg-18-5513-2021, https://doi.org/10.5194/bg-18-5513-2021, 2021
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The Gulf of Lion shelf is one of the most productive areas in the Mediterranean. A model is used to study the mechanisms that drive the particulate organic carbon (POC). The model reproduces the annual cycle of primary production well. The shelf appears as an autotrophic ecosystem with a high production and as a source of POC for the adjacent basin. The increase in temperature induced by climate change could impact the trophic status of the shelf.
Alireza Merikhi, Peter Berg, and Markus Huettel
Biogeosciences, 18, 5381–5395, https://doi.org/10.5194/bg-18-5381-2021, https://doi.org/10.5194/bg-18-5381-2021, 2021
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The aquatic eddy covariance technique is a powerful method for measurements of solute fluxes across the sediment–water interface. Data measured by conventional eddy covariance instruments require a time shift correction that can result in substantial flux errors. We introduce a triple O2 sensor eddy covariance instrument that by design eliminates these errors. Deployments next to a conventional instrument in the Florida Keys demonstrate the improvements achieved through the new design.
Jiatang Hu, Zhongren Zhang, Bin Wang, and Jia Huang
Biogeosciences, 18, 5247–5264, https://doi.org/10.5194/bg-18-5247-2021, https://doi.org/10.5194/bg-18-5247-2021, 2021
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In situ observations over 42 years were used to explore the long-term changes to low-oxygen conditions in the Pearl River estuary. Apparent expansion of the low-oxygen conditions in summer was identified, primarily due to the combined effects of increased anthropogenic inputs and decreased sediment load. Large areas of severe low-oxygen events were also observed in early autumn and were formed by distinct mechanisms. The estuary seems to be growing into a seasonal, estuary-wide hypoxic zone.
Indah Ardiningsih, Kyyas Seyitmuhammedov, Sylvia G. Sander, Claudine H. Stirling, Gert-Jan Reichart, Kevin R. Arrigo, Loes J. A. Gerringa, and Rob Middag
Biogeosciences, 18, 4587–4601, https://doi.org/10.5194/bg-18-4587-2021, https://doi.org/10.5194/bg-18-4587-2021, 2021
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Organic Fe speciation is investigated along a natural gradient of the western Antarctic Peninsula from an ice-covered shelf to the open ocean. The two major fronts in the region affect the distribution of ligands. The excess ligands not bound to dissolved Fe (DFe) comprised up to 80 % of the total ligand concentrations, implying the potential to solubilize additional Fe input. The ligands on the shelf can increase the DFe residence time and fuel local primary production upon ice melt.
Melissa R. McCutcheon, Hongming Yao, Cory J. Staryk, and Xinping Hu
Biogeosciences, 18, 4571–4586, https://doi.org/10.5194/bg-18-4571-2021, https://doi.org/10.5194/bg-18-4571-2021, 2021
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We used 5+ years of discrete samples and 10 months of hourly sensor measurements to explore temporal variability and environmental controls on pH and pCO2 at the Aransas Ship Channel. Seasonal and diel variability were both present but small compared to other regions in the literature. Despite the small tidal range, tidal control often surpassed biological control. In comparison with sensor data, discrete samples were generally representative of mean annual and seasonal carbonate chemistry.
Kai G. Schulz, Eric P. Achterberg, Javier Arístegui, Lennart T. Bach, Isabel Baños, Tim Boxhammer, Dirk Erler, Maricarmen Igarza, Verena Kalter, Andrea Ludwig, Carolin Löscher, Jana Meyer, Judith Meyer, Fabrizio Minutolo, Elisabeth von der Esch, Bess B. Ward, and Ulf Riebesell
Biogeosciences, 18, 4305–4320, https://doi.org/10.5194/bg-18-4305-2021, https://doi.org/10.5194/bg-18-4305-2021, 2021
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Upwelling of nutrient-rich deep waters to the surface make eastern boundary upwelling systems hot spots of marine productivity. This leads to subsurface oxygen depletion and the transformation of bioavailable nitrogen into inert N2. Here we quantify nitrogen loss processes following a simulated deep water upwelling. Denitrification was the dominant process, and budget calculations suggest that a significant portion of nitrogen that could be exported to depth is already lost in the surface ocean.
Heiner Dietze and Ulrike Löptien
Biogeosciences, 18, 4243–4264, https://doi.org/10.5194/bg-18-4243-2021, https://doi.org/10.5194/bg-18-4243-2021, 2021
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In recent years fish-kill events caused by oxygen deficit have been reported in Eckernförde Bight (Baltic Sea). This study sets out to understand the processes causing respective oxygen deficits by combining high-resolution coupled ocean circulation biogeochemical modeling, monitoring data, and artificial intelligence.
Cited articles
Aminot, A. and Kerouel, R.: Hydrologie des écosystèmes marins,
Paramètres et analyses, Editions de l'Ifremer, Méthodes d’analyse en milieu marin, 336 pp., ISBN
2-84433-133-5, 2004.
Banse, K.: Grazing and zooplankton production as key controls of
phytoplankton production in the open ocean, Oceanography, 7, 13–20,
1994.
Barbosa, A., Domingues, R., and GalvaÞo., H.: Environmental forcing of
phytoplankton in a Mediterranean estuary (Guadiana estuary, south-western
Iberia): A decadal study of anthropogenic and climatic influences, Estuar.
Coast., 33, 324–341,
https://doi.org/10.1007/s12237-009-9200-x, 2010.
Behrenfeld, M. J.: Abandoning Sverdrup's critical depth hypothesis on
phytoplankton blooms, Ecology, 91, 977–989, 2010.
Behrenfeld, M. J., Doney, S. C., Lima, I., Boss, E. S., and Siegel, D. A.:
Annual cycles of ecological disturbance and recovery underlying the
subarctic Atlantic spring plankton bloom, Global Biogeochem. Cy., 27, 526–540,
https://doi.org/10.1002/gbc.20050, 2013.
Beucher, C., Treguer, P., Corvaisier, R., Hapette, A. M., and Elskens, M.:
Production and dissolution of biosilica, and changing microphytoplankton
dominance in the Bay of Brest (France), Mar. Ecol. Prog. Ser., 267, 57–69, https://doi.org/10.3354/meps267057,
2004.
Boss, E. and Behrenfeld, M.: In situ evaluation of the initiation of the
North Atlantic phytoplankton bloom, Geophys. Res. Lett., 37, 18, https://doi.org/10.1029/2010GL044174, 2010.
Bouman, H., Platt, T., Sathyendranath, S., and Stuart, V.: Dependence of
light-saturated photosynthesis on temperature and community structure, Deep-Sea Res. Pt. I,
52, 1284–1299, https://doi.org/10.1016/j.dsr.2005.01.008, 2005.
Brody, S. R., Lozier, M. S., and Dunne, J. P.: A comparison of methods to
determine phytoplankton bloom initiation, J. Geophys. Res.-Ocean., 118, 2345–2357,
https://doi.org/10.1002/jgrc.20167, 2013.
Caracciolo, M., Beaugrand, G., Hélaouët, P., Gevaert, F., Edwards,
M., Lizon, F., Kléparski, L., and Goberville, E.: Annual phytoplankton succession
results from niche-environment interaction, J. Plank. Res., 43, 85–102,
https://doi.org/10.1093/plankt/fbaa060, 2021.
Carberry, L., Roesler, C., and Drapeau, S.: Correcting in situ chlorophyll fluorescence time-series observations for nonphotochemical quenching and tidal variability reveals nonconservative phytoplankton variability in coastal waters, Limnol. Oceanogr.-Method., 17, 462–473, https://doi.org/10.1002/lom3.10325, 2019.
Chapelle, A., Lazure, P., and Ménesguen, A.: Modelling eutrophication
events in a coastal ecosystem, Sensitivity analysis, Estuar. Coast. Shelf Sci., 39, 529–548,
https://doi.org/10.1016/S0272-7714(06)80008-9, 1994.
Charria, G., Lazure, P., Le Cann, B., Serpette, A., Reverdin, G., Louazel,
S., Batifoulier, F., Dumas, F., Pichon, A., and Morel, Y.: Surface layer
circulation derived from Lagrangian drifters in the Bay of Biscay, J. Mar. Syst., 109,
60–76, https://doi.org/10.1016/j.jmarsys.2011.09.015, 2013.
Chiswell, S., Calil, P., and Boyd, P.: Spring blooms and annual cycles of
phytoplankton: a unified perspective, J. Plank. Res., 37, 500–508,
https://doi.org/10.1093/plankt/fbv021, 2015.
Chivers, W. J., Edwards, M., and Hays, G. C.: Phenological shuffling of
major marine phytoplankton groups over the last six decades, Divers. Distrib., 26, 536–548,
https://doi.org/10.1111/ddi.13028, 2020.
Cloern, J. E.: Phytoplankton bloom dynamics in coastal ecosystems: a review
with some general lessons from sustained investigation of San Francisco Bay,
California, Rev. Geophys., 34, 127–168, https://doi.org/10.1029/96RG00986, 1996.
cocopom: cocopom/ipgp-detection: IPGP-detection v1.0 (v1.0), Zenodo [code], https://doi.org/10.5281/zenodo.7426540, 2022.
Cocquempot, L., Delacourt, C., Paillet, J., Riou, P., Aucan, J., Castelle,
B., Charria, G., Claudet, J., Conan, P., Coppola, L., Hocdé, R., Planes,
S., Raimbault, P., Savoye, N., Testut, L., and Vuillemin, R.: Coastal Ocean
and Nearshore Observation: A French Case Study, Front. Mar. Sci.,
6, 1–17, https://doi.org/10.3389/fmars.2019.00324, 2019.
Cugier, P., Billen, G., Guillaud, J. F., Garnier, J., and Ménesguen, A.:
Modelling the eutrophication of the Seine Bight (France) under historical,
present and future riverine nutrient loading, J. Hydrol., 304, 381–396,
https://doi.org/10.1016/j.jhydrol.2004.07.049, 2005.
Del Amo, Y., Le Pape, O., Tréguer, P., Quéguiner, B., Ménesguen,
A., and Aminot, A.: Impacts of high-nitrate freshwater inputs on macrotidal
ecosystems, I. Seasonal evolution of nutrient limitation for the
diatom-dominated phytoplankton of the Bay of Brest (France), Mar. Ecol. Prog. Ser., 161, 213–224,
1997.
Edwards, M., and Richardson, A. J.: Impact of climate change on marine
pelagic phenology and trophic mismatch, Nature, 430, 881–884,
https://doi.org/10.1038/nature02808, 2004.
Farcy, P., Durand, D., Charria, G., Painting, S.J., Tamminem, T.,
Collingridge, K., Grémare, A. J., Delauney, L., and Puillat, I.: Toward a
European coastal observing network to provide better answers to science and
to societal challenges; the JERICO research infrastructure, Front.
Mar. Sci., 6, 1–13, https://doi.org/10.3389/fmars.2019.00529, 2019.
Ferrer, L., Fontán, A., Mader, J., Chust, G., González, M.,
Valencia, V., Uriarte, A., and Collins, M. B.: Low-salinity plumes in the
oceanic region of the Basque Country, Cont. Shelf Res., 29,
970–984, https://doi.org/10.1016/j.csr.2008.12.014, 2009.
Frère, L., Paul-Pont, I., Rinnert, E., Petton, S., Jaffré, J.,
Bihannic, I., Soudant, P., Lambert, C., and Huvet, A.: Influence of
environmental and anthropogenic factors on the composition, concentration
and spatial distribution of microplastics: a case study of the Bay of Brest
(Brittany, France), Environ. Pollut., 225, 211–222,
https://doi.org/10.1016/j.envpol.2017.03.023, 2017.
Friedland, K. D., Mouw, C. B., Asch, R. G., Ferreira, A. S. A., Henson, S.,
Hyde, J. W., Morse, R., Thomas, A., and Braddy, D.: Phenology and time series trends of the
dominant seasonal phytoplankton bloom across global scales, Glob. Ecol. Biogeogr., 27, 551–569,
https://doi.org/10.1111/geb.12717, 2018.
Glé, C., Del Amo, Y., Bec, B., Sautour, B., Froidefond, J. M., Gohin,
F., Maurer, D., Plus, M., Laborde, P., and Chardy, P.: Typology of
environmental conditions at the onset of winter phytoplankton blooms in a
shallow macrotidal coastal ecosystem, Arcachon Bay (France), J. Plank. Res., 29,
999–1014, https://doi.org/10.1093/plankt/fbm074, 2007.
Gohin, F., Van der Zande, D., Tilstone, G., Eleveld, M. A., Lefebvre, A.,
Andrieux-Loyer, F., Blauw, A. N., Bryère, P., Devreker, D., Garnesson,
P., Hernández Fariñas, T., Lamaury, Y., Lampert, L., Lavigne, H.,
Menet-Nedelec, F., Pardo, S., and Saulquin, B.: Twenty years of satellite
and in situ observations of surface chlorophyll a from the northern Bay of
Biscay to the eastern English Channel. Is the water quality improving?,
Remote Sens. Environ., 233, 111343, https://doi.org/10.1016/j.rse.2019.111343, 2019.
Gomez, F. and Souissi, S.: The impact of the 2003 heat wave and the 2005
cold wave on the phytoplankton in the north-eastern English Channel, Compt.
Rend. Biol., 331, 678–685, https://doi.org/10.1016/j.crvi.2008.06.005, 2008.
Grasso F., Le Hir P., and Bassoullet P.: Numerical modelling of
mixed-sediment consolidation, Ocean Dynam., 65, 607–616,
https://doi.org/10.1007/s10236-015-0818-x, 2015.
Hartigan, J. and Wong, M.: Algorithm AS 136: A K-Means Clustering
Algorithm, J. Roy. Stat. Soc. Ser. C, 28, 100–108, 1979.
Henson, S. A., Cole, H. S., Hopkins, J., Martin, A. P., and Yool, A.:
Detection of climate change-driven trends in phytoplankton
phenology, Glob. Change Biol., 24, 101–111, https://doi.org/10.1111/gcb.13886, 2018.
Huisman, J. E. F., van Oostveen, P., and Weissing, F. J.: Critical depth and
critical turbulence: two different mechanisms for the development of
phytoplankton blooms, Limnol. Oceanogr., 44, 1781–1787, https://doi.org/10.4319/lo.1999.44.7.1781,
1999.
Hunter-Cevera, K. R., Neubert, M. G., Olson, R. J., Solow, A. R.,
Shalapyonok, A., and Sosik, H. M.: Physiological and ecological drivers of
early spring blooms of a coastal phytoplankter, Science, 354, 326–329,
https://doi.org/10.1126/science.aaf8536, 2016.
Ianson, D., Pond, S., and Parsons, T.: The spring phytoplankton bloom in the
coastal temperate ocean: growth criteria and seeding from shallow
embayments, J. Oceanogr., 57, 723–734, https://doi.org/10.1023/A:1021288510407, 2001.
IPCC, Masson-Delmotte, V., Zhai, P., Pirani, A., Connors, S. L., Peìan, C., Berger, S., Caud, N., Chen, Y., Goldfarb, L., Gomis, M. I., Huang, M., Leitzell, K., Lonnoy, E., Matthews, J. B. R., Maycock, T. K., Waterfield, T., Yelekçi, O., Yu, R., and Zhou, B.: Climate change 2021: the physical science basis. Contribution of working group I to the sixth assessment report of the intergovernmental panel on climate change, Cambridge University Press, 2, 2391 pp., 2021.
Iriarte, A. and Purdie, D. A.: Factors controlling the timing of major
spring bloom events in an UK south coast estuary, Estuar. Coast. Shelf Sci., 61, 679–690,
https://doi.org/10.1016/j.ecss.2004.08.002, 2004.
Isemer, H.-J. and Hasse, L.: The Bunker Climate Atlas of the North Atlantic
Ocean, Vol. 2, Springer, Berlin, 218–252, ISBN-10: 0387155686, 1985.
Joordens, J. C. A., Souza, A. J., and Visser, A.: The influence of tidal
straining and wind on suspended matter and phytoplankton distribution in the
Rhine outflow region, Cont. Shelf Res., 21, 301–325, https://doi.org/10.1016/S0278-4343(00)00095-9,
2001.
Kromkamp, J. C. and Van Engeland, T.: Changes in phytoplankton biomass in
the western Scheldt estuary during the period 1978–2006, Estuar. Coast., 33, 270–285,
https://doi.org/10.1007/s12237-009-9215-3, 2010.
Kim, H. J., Miller, A. J., McGowan, J., and Carter, M. L.: Coastal
phytoplankton blooms in the Southern California Bight, Prog. Oceanogr., 82, 137–147,
https://doi.org/10.1016/j.pocean.2009.05.002, 2009.
Lazure, P. and Dumas, F.: An external–internal mode coupling for a 3D
hydrodynamical model for applications at regional scale (MARS), Adv. Water Res., 31,
233–250, https://doi.org/10.1016/j.advwatres.2007.06.010, 2008.
Lazure, P. and Jégou, A. M.: 3D modelling of seasonal evolution of
Loire and Gironde plumes on Biscay Bay continental shelf, Oceanol. Acta, 21, 165–177,
https://doi.org/10.1016/S0399-1784(98)80006-6, 1998.
Lefort, T. and Gasol, J. M.: Short-time scale coupling of picoplankton
community structure and single-cell heterotrophic activity in winter in
coastal NW Mediterranean Sea waters, J. Plank. Res., 36, 243–258,
https://doi.org/10.1093/plankt/fbt073, 2014.
Le Hir P., Cayocca F., and Waeles B.: Dynamics of sand and mud mixtures: A
multiprocess-based modelling strategy, Cont. Shelf Res., 31, 135–149,
https://doi.org/10.1016/j.csr.2010.12.009, 2011.
Lehmuskero, A., Skogen Chauton, M., and Boström, T.: Light and
photosynthetic microalgae: A review of cellular- and molecular-scale optical
processes, Prog. Oceanogr., 168, 43–56, https://doi.org/10.1016/j.pocean.2018.09.002, 2018.
Le Pape, O. and Menesguen, A.: Hydrodynamic prevention of eutrophication in
the Bay of Brest (France), a modelling approach, J. Mar. Syst., 12, 171–186,
https://doi.org/10.1016/S0924-7963(96)00096-6, 1997.
Liu, X., Dunne, J. P., Stock, C. A., Harrison, M. J., Adcroft, A., and
Resplandy, L.: Simulating water residence time in the coastal ocean: A
global perspective, Geophys. Res. Lett., 46, 13910–13919, https://doi.org/10.1029/2019GL085097, 2019.
Ménesguen, A., Dussauze, M., and Dumas, F.: Designing optimal scenarios
of nutrient loading reduction in a WFD/MSFD perspective by using passive
tracers in a biogeochemical-3D model of the English Channel/Bay of Biscay
area, Ocean Coast. Manag., 163, 37–53, https://doi.org/10.1016/j.ocecoaman.2018.06.005, 2018.
Ménesguen, A., Dussauze, M., Dumas, F., Thouvenin, B., Garnier, V.,
Lecornu, F., and Répécaud, M.: Ecological model of the Bay of Biscay
and English Channel shelf for environmental status assessment part 1:
Nutrients, phytoplankton and oxygen, Ocean Modelling, 133, 56–78,
https://doi.org/10.1016/j.ocemod.2018.11.002, 2019.
Mengual B., Le Hir P., Cayocca F., and Garlan T.: Modelling fine sediment
dynamics: Towards a common erosion law for fine sand, mud and mixtures,
Water, 9, 564, https://doi.org/10.3390/w9080564, 2017.
Merceron, M.: Impact du barrage d’Arzal sur la qualité des eaux de l’estuaire de la baie de Vilaine, 31 pp., Ifremer, Brest, France, 1985 (in French).
Mikaelyan, A., Chasovnikov, V., Kubryakov, A., and Stanichny, S.: Phenology
and drivers of the winter-spring phytoplankton bloom in the open Black Sea:
The application of Sverdrup's hypothesis and its refinements, Prog.
Oceanogr., 151, 163–176, https://doi.org/10.1016/j.pocean.2016.12.006, 2017.
Muller, H., Blanke, B., Dumas, F., and Mariette, V.: Identification of typical scenarios for the surface Lagrangian residual circulation in the Iroise Sea, J. Geophys. Res., 115, 1–14, https://doi.org/10.1029/2009JC005834, 2010.
Oliver, E., Donat, M., Burrows, M., Moore, P., Smale, D., Alexanda, L.,
Benthuysen, J., Feng, M., Sen Gupta, A., Hobday, A., Holbrook, N.,
Perkins-Kirkpatrick, S., Scannell, H., Straub, S., and Wernberg, T.: Longer
and more frequent marine heatwaves over the past century, Nat.
Commun., 9, 1324, https://doi.org/10.1038/s41467-018-03732-9, 2018.
Paerl, H. W., Hall, N. S., Peierls, B. L., and Rossignol, K. L.: Evolving
paradigms and challenges in estuarine and coastal eutrophication dynamics in
a culturally and climatically stressed world, Estuar. Coast., 37, 243–258,
https://doi.org/10.1007/s12237-014-9773-x, 2014.
Peierls, B. L., Hall, N. S., and Paerl, H. W.: Non-monotonic responses of
phytoplankton biomass accumulation to hydrologic variability: a comparison
of two coastal plain North Carolina estuaries, Estuar. Coast., 35, 1376–1392,
https://doi.org/10.1007/s12237-012-9547-2, 2012.
Philippart, C. J. M., van Iperen, J. M., Cadée, G. C., and Zuur, A. F.:
Long-term field observations on seasonality in chlorophyll-a concentrations
in a shallow coastal marine ecosystem, the Wadden Sea, Estuar. Coast.,
33, 286–294, https://doi.org/10.1007/s12237-009-9236-y, 2010.
Pingree, R. D. and Le Cann, B.: Celtic and Armorican slope and shelf residual
currents, Prog. Oceanogr., 23, 303–338,
https://doi.org/10.1016/0079-6611(89)90003-7, 1989.
Plus, M., Thouvenin, B., Andrieux, F., Dufois, F., Ratmaya, W., and Souchu, P.:
Diagnostic étendu de l'eutrophisation (DIETE), Modélisation
biogéochimique de la zone Vilaine-Loire avec prise en compte des
processus sédimentaires, Description du modèle Bloom (BiogeochemicaL
coastal Ocean Model), RST/LER/MPL/21.15,
https://archimer.ifremer.fr/doc/00754/86567/ (last access: 20 March 2022), 2021.
Poppeschi, C., Charria, G., Goberville, E., Rimmelin-Maury, P., Barrier, N.,
Petton, S., Unterberger, M., Grossteffan, E., Repeccaud, M.,
Quéméner, L., Le Roux, J.-F., and Tréguer, P.: Unraveling
salinity extreme events in coastal environments: a winter focus on the bay
of Brest, Front. Mar. Sci., 8,
705403, https://doi.org/10.3389/fmars.2021.705403, 2021.
Quéguiner, B. and Tréguer, P.: Studies on the Phytoplankton in the
Bay of Brest (Western Europe), Seasonal Variations in Composition, Biomass
and Production in Relation to Hydrological and Chemical Features
(1981—1982), Bot. Mar., 27, 449–459, 1984.
Ragueneau, O., Quéguiner, B., and Tréguer, P.: Contrast in biological
responses to tidally-induced vertical mixing for two macrotidal ecosystems
of western Europe, Estuar. Coast. Shelf Sci., 42, 645–665,
https://doi.org/10.1006/ecss.1996.0042, 1996.
Ragueneau, O., Chauvaud, L., Leynaert, A., Thouzeau, G., Paulet, Y. M.,
Bonnet, S., Lorrain, A., Grall, J., Corvaisier, R., Le Hir, M., Jean, F.,
and Clavier, J.: Direct evidence of a biologically active coastal silicate
pump: ecological implications, Limnol. Oceanogr., 47, 1849–1854,
https://doi.org/10.4319/lo.2002.47.6.1849, 2002.
Ragueneau, O., Raimonet, M., Mazé, C., Coston-Guarini, J., Chauvaud, L.,
Danto, A., Grall, J., Jean, F., Paulet Y.-M., and Thouzeau, G.: The
impossible sustainability of the Bay of Brest? Fifty years of ecosystem
changes, interdisciplinary knowledge construction and key questions at the
science-policy-community interface, Front. Mar. Sci., 5, 124,
https://doi.org/10.3389/fmars.2018.00124, 2018.
Ratmaya, W., Soudant, D., Dalmon-Monviola, J., Plus, M., Cochennec-Laureau,
N., Goubert, E., Andrieux-Loyer, F., Barillé, L., and Souchu, P.: Reduced
phosphorus loads from the Loire and Vilaine rivers were accompanied by
increasing eutrophication in the Vilaine Bay (south Brittany, France),
Biogeosciences, 16, 1361–1380, https://doi.org/10.5194/bg-16-1361-2019, 2019.
Ratmaya, W., Laverman, A. M., Rabouille, C., Akbarzadeh, Z., Andrieux-Loyer,
F., Barillé, L., Barillé, A.-L., Le Merrer, Y., and Souchu, P.:
Temporal and spatial variations in benthic nitrogen cycling in a temperate
macro-tidal coastal ecosystem: Observation and modeling, Cont. Shelf Res., 235,
https://doi.org/10.1016/j.csr.2022.104649, 2022.
Répécaud, M., Quemener, L., Charria, G., Pairaud, I., Rimmelin, P.,
Claquin, P., Jacqueline, F., Lefebvre, A., Facq, J. V., Retho, M., and
Verney, R.: National observation infrastructure: an example of a
fixed-platforms network along the French Coast: COAST HF, OCEANS 2019, Marseille, IEEE,
1–6, https://doi.org/10.1109/OCEANSE.2019.8867451, 2019.
REPHY: French Observation and Monitoring program for Phytoplankton and
Hydrology in coastal waters, REPHY dataset – French Observation and
Monitoring program for Phytoplankton and Hydrology in coastal waters,
Metropolitan data, SEANOE, https://doi.org/10.17882/47248, 2021.
Retho, M., Quemener, L., Le Gall, C., Repecaud, M., Souchu, P., Gabellec, R., and Manach, S.: COAST-HF – data and metadata from the MOLIT buoy in the Vilaine Bay, SEANOE [data set], https://doi.org/10.17882/46529, 2022.
Rimmelin-Maury, P., Charria, G., Repecaud, M., Quemener, L., Beaumont, L., Guillot, A., Gautier, L., Prigent, S., Le Becque, T., Bihannic, I., Bonnat, A., Le Roux, J.-F., Grossteffan, E., Devesa, J., Bozec, Y.: Iroise buoy s data from Coriolis data center as core parameter support for Brest Bay and Iroise sea studies, SEANOE [data set], https://doi.org/10.17882/74004, 2020.
Rossignol-Strick, M.: A marine anoxic event on the Brittany coast, July
1982, J. Coast. Res., 11–20, https://www.jstor.org/stable/4297005 (last access: 20 March 2022), 1985.
Rumyantseva, A., Henson, S., Martin, A., Thompson, A. F., Damerell, G. M.,
Kaiser, J., and Heywood, K. J.: Phytoplankton spring bloom initiation: The
impact of atmospheric forcing and light in the temperate North Atlantic,
Ocean, Prog. Oceanogr., 178, 102202, https://doi.org/10.1016/j.pocean.2019.102202, 2019.
Saeck, E. A., Hadwen, W. L., Rissik, D., O'Brien, K. R., and Burford, M. A.:
Flow events drive patterns of phytoplankton distribution along a
river–estuary–bay continuum, Mar. Freshw. Res., 64, 655–670, https://doi.org/10.1071/MF12227, 2013.
Sathyendranath, S., Ji, R., and Browman, H. I.: Revisiting Sverdrup's
critical depth hypothesis, ICES J. Mar. Sci., 72, 1892–1896, https://doi.org/10.1093/icesjms/fsv110,
2015.
Schlegel, R. W., Darmaraki, S., Benthuysen, J. A., Filbee-Dexter, K., and
Oliver, E. C.: Marine cold-spells, Prog. Oceanogr., 198, 102684,
https://doi.org/10.1101/2021.10.18.464880, 2021.
Serre-Fredj, L., Jacqueline, F., Navon, M., Izabel, G., Chasselin, L.,
Jolly, O., Repecaud, M., and Claquin, P.: Coupling high frequency monitoring and
bioassay experiments to investigate a harmful algal bloom in the Bay of
Seine (French-English Channel), Mar. Pollut. Bull., 168, 112387,
https://doi.org/10.1016/j.marpolbul.2021.112387, 2021.
Smetacek, V. and Cloern, J. E.: On phytoplankton
trends, Science, 319, 1346–1348, https://doi.org/10.1126/science.1151330, 2008.
Sommer, U., Adrian, R., De Senerpont Domis, L., Elser, J. J., Gaedke, U.,
Ibelings, B., Jeppesen, E., Lürling, M., Molinero, J. C., Mooij, W. M.,
van Donk, E., and Winder, M.: Beyond the Plankton Ecology Group (PEG) model:
mechanisms driving plankton succession, Ann. Rev. Ecol. Evolut. Syst., 43, 429–448,
https://doi.org/10.1146/annurev-ecolsys-110411-160251, 2012.
Sverdrup, H.: On vernal blooming of phytoplankton, Conseil Exp. Mer, 18, 287–295, 1953.
Thyssen, M., Tarran, G. A., Zubkov, M. V., Holland, R. J., Grégori, G.,
Burkill, P. H., and Denis, M.: The emergence of automated high-frequency
flow cytometry: revealing temporal and spatial phytoplankton variability,
J. Plank. Res., 30, 333–343, https://doi.org/10.1093/plankt/fbn005, 2008.
Tian, T., Merico, A., Su, J., Staneva, J., Wiltshire, K., and Wirtz, K.:
Importance of resuspended sediment dynamics for the phytoplankton spring
bloom in a coastal marine ecosystem, J. Sea Res., 62, 214–228,
https://doi.org/10.1016/j.seares.2009.04.001, 2009.
Tian, T., Su, J., Flöser, G., Wiltshire, K., and Wirtz, K.: Factors
controlling the onset of spring blooms in the German Bight 2002–2005:
light, wind and stratification, Cont. Shelf Res., 31, 1140–1148,
https://doi.org/10.1016/j.csr.2011.04.008, 2011.
Townsend, D. W., Cammen, L. M., Holligan, P. M., Campbell, D. E., and
Pettigrew, N. R.: Causes and consequences of variability in the timing of
spring phytoplankton blooms, Deep-Sea Res. Pt. I, 41, 747–765,
https://doi.org/10.1016/0967-0637(94)90075-2, 1994.
Trombetta, T., Vidussi, F., Mas, S., Parin, D., Simier, M., and Mostajir,
B.: Water temperature drives phytoplankton blooms in coastal waters, PloS One, 14,
e0214933, https://doi.org/10.1371/journal.pone.0214933, 2019.
Wiltshire, K. H., Malzahn, A. M., Wirtz, K., Greve, W., Janisch, S.,
Mangelsdorf, P., Manly, B., and Boersma, M.: Resilience of North Sea phytoplankton
spring bloom dynamics: An analysis of long-term data at Helgoland
Roads, Limnol. Oceanogr., 53, 1294–1302, https://doi.org/10.4319/lo.2008.53.4.1294, 2008.
Wiltshire, K. H., Boersma, M., Carstens, K., Kraberg, A. C., Peters, S., and
Scharfe, M.: Control of phytoplankton in a shelf sea: determination of the
main drivers based on the Helgoland Roads Time Series, J. Sea Res.h, 105, 42–52,
https://doi.org/10.1016/j.seares.2015.06.022, 2015.
Short summary
This paper aims to understand interannual changes in the initiation of the phytoplankton growing period (IPGP) in the current context of global climate changes over the last 20 years. An important variability in the timing of the IPGP is observed with a trend towards a later IPGP during this last decade. The role and the impact of extreme events (cold spells, floods, and wind burst) on the IPGP is also detailed.
This paper aims to understand interannual changes in the initiation of the phytoplankton growing...
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