Articles | Volume 19, issue 4
https://doi.org/10.5194/os-19-1183-2023
© Author(s) 2023. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/os-19-1183-2023
© Author(s) 2023. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Research article
| 
04 Aug 2023
Research article |
| 04 Aug 2023
| 04 Aug 2023
Sensitivity of gyre-scale marine connectivity estimates to fine-scale circulation
Saeed Hariri
CORRESPONDING AUTHOR
LMD-IPSL, École normale supérieure, PSL, 24 rue Lhomond,
75005 Paris, CEDEX 05, France
Physical Oceanography and Instrumentation, Leibniz Institute for
Baltic Sea Research Warnemünde (IOW), Seestraße 15, 18119
Rostock, Germany
Sabrina Speich
LMD-IPSL, École normale supérieure, PSL, 24 rue Lhomond,
75005 Paris, CEDEX 05, France
Bruno Blanke
Univ Brest, Laboratoire d'Océanographie Physique et Spatiale, UMR6523 CNRS-Ifremer-IRDUBO, 29280 Plouzané, France
Marina Lévy
Sorbonne Université, LOCEAN-IPSL, CNRS/IRD/MNHN, Paris, CEDEX
05, France
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Marina Lévy, Karina von Schuckmann, William Cheung, Joachim Claudet, Thomas L. Frölicher, Patrice Guillotreau, Peter Haugan, Janine Adams, Diva Amon, Tamatoa Bambridge, Cynthia Barzuna, Bruno Blanke, Lijing Cheng, Sanae Chiba, Jorge Cortés, Pierre Friedlingstein, Jean-Pierre Gattuso, Stefan Gelcich, Jessica Gephart, Deborah Greaves, Audrey Hasson, Claire Jolly, Daoji Li, Yunne-Jai Shin, Aimée Slangen, Mere Takoko, Olivier Thébaud, Adrien Vincent, and Patrick Vincent
State Planet Discuss., https://doi.org/10.5194/sp-2026-1, https://doi.org/10.5194/sp-2026-1, 2026
Preprint under review for SP
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The Starfish Barometer provides an annual, science-based synthesis of global Ocean-related developments, structured around five interconnected dimensions: the Ocean state, human pressures, societal harms, protection efforts, and opportunities for humanity. It is released each year on World Ocean Day. This article presents the second edition of the Barometer, which shows a growing gap between increasing human pressures on the Ocean and the efforts being made to protect it and drive change.
Audrey Minière, Karina von Schuckmann, and Sabrina Speich
Earth Syst. Sci. Data Discuss., https://doi.org/10.5194/essd-2026-106, https://doi.org/10.5194/essd-2026-106, 2026
Preprint under review for ESSD
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This study assesses the sensitivity of global ocean heat content estimates to key methodological choices. Global trends are robust across methodological configurations. Most of the spread comes from the choice of temperature dataset, while other methodological impacts remain small. Our results show that both research and operational indicators consistently track global ocean warming, supporting their reliability and traceability for climate monitoring and Earth energy budget assessments.
Pablo Fernández, Sabrina Speich, Guillaume Lapeyre, Claudia Pasquero, Carlos Conejero, Lionel Renault, and Fabien Desbiolles
Ocean Sci., 22, 699–725, https://doi.org/10.5194/os-22-699-2026, https://doi.org/10.5194/os-22-699-2026, 2026
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We use a high-resolution ocean-atmosphere coupled simulation to assess the effects of fine-scale sea surface temperature, surface currents, and ocean vertical stratification on the spatial variability of latent heat flux in the Northwest Tropical Atlantic. The results show significant impacts from these three variables in latent heat flux. They stress the need to account for fine-scale ocean processes in the coarser global coupled models even in relatively quiescent regions like the tropics.
Yan Barabinot, Sabrina Speich, and Xavier Carton
Ocean Sci., 21, 2527–2553, https://doi.org/10.5194/os-21-2527-2025, https://doi.org/10.5194/os-21-2527-2025, 2025
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Mesoscale eddies, characterized by rotating currents, are ubiquitous in the ocean. However, their three-dimensional structure remains poorly observed and analyzed, with transport estimates often relying on approximations. To better quantify their shape, we propose a new theoretical framework based on geophysical fluid dynamics and apply it to field observations.
Yan Barabinot, Sabrina Speich, Xavier Carton, Pierre L'Hégaret, Corentin Subirade, Rémi Laxenaire, and Johannes Karstensen
Ocean Sci., 21, 1849–1872, https://doi.org/10.5194/os-21-1849-2025, https://doi.org/10.5194/os-21-1849-2025, 2025
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Mesoscale eddies are rotating oceanic currents key to ocean variability. Off Brazil’s northeast coast, the North Brazil Current generates on average 4.5 eddies per year, which drift towards the West Indies, transporting waters from the Southern Hemisphere. Using data collected at sea by the EUREC4A-OA cruise, this study reveals that deep eddies transport 5 times more water than surface ones, reshaping our understanding of the regional water transport.
Mathieu Delteil, Marina Lévy, and Laurent Bopp
EGUsphere, https://doi.org/10.5194/egusphere-2025-2805, https://doi.org/10.5194/egusphere-2025-2805, 2025
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The ocean is losing oxygen due to climate change, threatening ecosystems, especially in naturally low-oxygen areas called Oxygen Minimum Zones (OMZs). Using the IPSL-CM6A-LR Large Ensemble, this study identifies when climate-driven changes in OMZ volumes and regional deoxygenation emerge from natural variability. We highlight hemispheric asymmetries due to ocean ventilation and provide model-based estimates for the timing of detectable OMZ evolution.
Yawouvi Dodji Soviadan, Miriam Beck, Joelle Habib, Alberto Baudena, Laetitia Drago, Alexandre Accardo, Remi Laxenaire, Sabrina Speich, Peter Brandt, Rainer Kiko, and Stemmann Lars
Biogeosciences, 22, 3485–3501, https://doi.org/10.5194/bg-22-3485-2025, https://doi.org/10.5194/bg-22-3485-2025, 2025
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Key parameters representing the gravity flux in global models are sinking speed and vertical attenuation of exported material. We calculate, for the first time, these parameters in situ in the ocean for six intermittent blooms followed by export events using high-resolution (3 d) time series of 0–1000 m depth profiles from imaging sensors mounted on an Argo float. We show that sinking speed depends not only on size but also on the morphology of the particles, with density being an important property.
Marina Lévy, Karina von Schuckmann, Patrick Vincent, Bruno Blanke, Joachim Claudet, Patrice Guillotreau, Audrey Hasson, Claire Jolly, Yunne Shin, Olivier Thébaud, Adrien Vincent, and Pierre Bahurel
State Planet, 6-osr9, 1, https://doi.org/10.5194/sp-6-osr9-1-2025, https://doi.org/10.5194/sp-6-osr9-1-2025, 2025
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The Ocean is vital to humanity, but humans are putting it at risk. The Starfish Barometer is a new yearly civic rendezvous that shows how people and the Ocean affect each other. Using science-based facts, it highlights major trends in ocean health, the pressures it faces, the harm to people, and current protection efforts and opportunities. The goal is to raise awareness to secure a better future for the Ocean and humanity.
Madhavan Girijakumari Keerthi, Olivier Aumont, Lester Kwiatkowski, and Marina Levy
Biogeosciences, 22, 2163–2180, https://doi.org/10.5194/bg-22-2163-2025, https://doi.org/10.5194/bg-22-2163-2025, 2025
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We assessed how well climate models replicate sub-seasonal changes in ocean chlorophyll observed by satellites. Models struggle to capture these variations accurately. Some overestimate fluctuations and their impact on annual chlorophyll variability, while others underestimate them. The underestimation is likely due to limited model resolution, while the overestimation may come from internal model oscillations.
Alexandre Accardo, Rémi Laxenaire, Alberto Baudena, Sabrina Speich, Rainer Kiko, and Lars Stemmann
Biogeosciences, 22, 1183–1201, https://doi.org/10.5194/bg-22-1183-2025, https://doi.org/10.5194/bg-22-1183-2025, 2025
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The open ocean helps mitigate climate change by storing CO2 via the biological carbon pump (BCP), which involves processes like organic carbon production at the surface and transferring it to the deep ocean via various pathways. By deploying an autonomous platform, we found significant marine snow accumulation from the surface to the mesopelagic zone in frontal regions between eddies. We suggest that the coupling of hydrodynamics at eddy edges and biological activity may enhance this process.
Stéphane Doléac, Marina Lévy, Roy El Hourany, and Laurent Bopp
Biogeosciences, 22, 841–862, https://doi.org/10.5194/bg-22-841-2025, https://doi.org/10.5194/bg-22-841-2025, 2025
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The marine biogeochemistry components of Coupled Model Intercomparison Project phase 6 (CMIP6) models vary widely in their process representations. Using an innovative bioregionalization of the North Atlantic, we reveal that this model diversity largely drives the divergence in net primary production projections under a high-emission scenario. The identification of the most mechanistically realistic models allows for a substantial reduction in projection uncertainty.
Yan Barabinot, Sabrina Speich, and Xavier Carton
Ocean Sci., 21, 151–179, https://doi.org/10.5194/os-21-151-2025, https://doi.org/10.5194/os-21-151-2025, 2025
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Mesoscale eddies are ubiquitous rotating currents in the ocean. Some eddies, called "materially coherent", are able to transport a different water mass from the surrounding water. By analyzing 3D eddy structures sampled during oceanographic cruises, we found that eddies can be nonmaterially coherent, accounting only for their surface properties, but materially coherent considering their properties at depth. Future studies cannot rely solely on satellite data to evaluate heat and salt transport.
Roy El Hourany, Juan Pierella Karlusich, Lucie Zinger, Hubert Loisel, Marina Levy, and Chris Bowler
Ocean Sci., 20, 217–239, https://doi.org/10.5194/os-20-217-2024, https://doi.org/10.5194/os-20-217-2024, 2024
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Satellite observations offer valuable information on phytoplankton abundance and community structure. Here, we employ satellite observations to infer seven phytoplankton groups at a global scale based on a new molecular method from Tara Oceans. The link has been established using machine learning approaches. The output of this work provides excellent tools to collect essential biodiversity variables and a foundation to monitor the evolution of marine biodiversity.
Jonathan Andrew Baker, Richard Renshaw, Laura Claire Jackson, Clotilde Dubois, Doroteaciro Iovino, Hao Zuo, Renellys C. Perez, Shenfu Dong, Marion Kersalé, Michael Mayer, Johannes Mayer, Sabrina Speich, and Tarron Lamont
State Planet, 1-osr7, 4, https://doi.org/10.5194/sp-1-osr7-4-2023, https://doi.org/10.5194/sp-1-osr7-4-2023, 2023
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We use ocean reanalyses, in which ocean models are combined with observations, to infer past changes in ocean circulation and heat transport in the South Atlantic. Comparing these estimates with other observation-based estimates, we find differences in their trends, variability, and mean heat transport but closer agreement in their mean overturning strength. Ocean reanalyses can help us understand the cause of these differences, which could improve estimates of ocean transports in this region.
Inès Mangolte, Marina Lévy, Clément Haëck, and Mark D. Ohman
Biogeosciences, 20, 3273–3299, https://doi.org/10.5194/bg-20-3273-2023, https://doi.org/10.5194/bg-20-3273-2023, 2023
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Ocean fronts are ecological hotspots, associated with higher diversity and biomass for many marine organisms, from bacteria to whales. Using in situ data from the California Current Ecosystem, we show that far from being limited to the production of diatom blooms, fronts are the scene of complex biophysical couplings between biotic interactions (growth, competition, and predation) and transport by currents that generate planktonic communities with an original taxonomic and spatial structure.
Clément Haëck, Marina Lévy, Inès Mangolte, and Laurent Bopp
Biogeosciences, 20, 1741–1758, https://doi.org/10.5194/bg-20-1741-2023, https://doi.org/10.5194/bg-20-1741-2023, 2023
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Phytoplankton vary in abundance in the ocean over large regions and with the seasons but also because of small-scale heterogeneities in surface temperature, called fronts. Here, using satellite imagery, we found that fronts enhance phytoplankton much more where it is already growing well, but despite large local increases the enhancement for the region is modest (5 %). We also found that blooms start 1 to 2 weeks earlier over fronts. These effects may have implications for ecosystems.
Pierre L'Hégaret, Florian Schütte, Sabrina Speich, Gilles Reverdin, Dariusz B. Baranowski, Rena Czeschel, Tim Fischer, Gregory R. Foltz, Karen J. Heywood, Gerd Krahmann, Rémi Laxenaire, Caroline Le Bihan, Philippe Le Bot, Stéphane Leizour, Callum Rollo, Michael Schlundt, Elizabeth Siddle, Corentin Subirade, Dongxiao Zhang, and Johannes Karstensen
Earth Syst. Sci. Data, 15, 1801–1830, https://doi.org/10.5194/essd-15-1801-2023, https://doi.org/10.5194/essd-15-1801-2023, 2023
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In early 2020, the EUREC4A-OA/ATOMIC experiment took place in the northwestern Tropical Atlantic Ocean, a dynamical region where different water masses interact. Four oceanographic vessels and a fleet of autonomous devices were deployed to study the processes at play and sample the upper ocean, each with its own observing capability. The article first describes the data calibration and validation and second their cross-validation, using a hierarchy of instruments and estimating the uncertainty.
Adriana Bailey, Franziska Aemisegger, Leonie Villiger, Sebastian A. Los, Gilles Reverdin, Estefanía Quiñones Meléndez, Claudia Acquistapace, Dariusz B. Baranowski, Tobias Böck, Sandrine Bony, Tobias Bordsdorff, Derek Coffman, Simon P. de Szoeke, Christopher J. Diekmann, Marina Dütsch, Benjamin Ertl, Joseph Galewsky, Dean Henze, Przemyslaw Makuch, David Noone, Patricia K. Quinn, Michael Rösch, Andreas Schneider, Matthias Schneider, Sabrina Speich, Bjorn Stevens, and Elizabeth J. Thompson
Earth Syst. Sci. Data, 15, 465–495, https://doi.org/10.5194/essd-15-465-2023, https://doi.org/10.5194/essd-15-465-2023, 2023
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One of the novel ways EUREC4A set out to investigate trade wind clouds and their coupling to the large-scale circulation was through an extensive network of isotopic measurements in water vapor, precipitation, and seawater. Samples were taken from the island of Barbados, from aboard two aircraft, and from aboard four ships. This paper describes the full collection of EUREC4A isotopic in situ data and guides readers to complementary remotely sensed water vapor isotope ratios.
Léa Olivier, Jacqueline Boutin, Gilles Reverdin, Nathalie Lefèvre, Peter Landschützer, Sabrina Speich, Johannes Karstensen, Matthieu Labaste, Christophe Noisel, Markus Ritschel, Tobias Steinhoff, and Rik Wanninkhof
Biogeosciences, 19, 2969–2988, https://doi.org/10.5194/bg-19-2969-2022, https://doi.org/10.5194/bg-19-2969-2022, 2022
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We investigate the impact of the interactions between eddies and the Amazon River plume on the CO2 air–sea fluxes to better characterize the ocean carbon sink in winter 2020. The region is a strong CO2 sink, previously underestimated by a factor of 10 due to a lack of data and understanding of the processes responsible for the variability in ocean carbon parameters. The CO2 absorption is mainly driven by freshwater from the Amazon entrained by eddies and by the winter seasonal cooling.
Alain de Verneil, Zouhair Lachkar, Shafer Smith, and Marina Lévy
Biogeosciences, 19, 907–929, https://doi.org/10.5194/bg-19-907-2022, https://doi.org/10.5194/bg-19-907-2022, 2022
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The Arabian Sea is a natural CO2 source to the atmosphere, but previous work highlights discrepancies between data and models in estimating air–sea CO2 flux. In this study, we use a regional ocean model, achieve a flux closer to available data, and break down the seasonal cycles that impact it, with one result being the great importance of monsoon winds. As demonstrated in a meta-analysis, differences from data still remain, highlighting the great need for further regional data collection.
Zouhair Lachkar, Michael Mehari, Muchamad Al Azhar, Marina Lévy, and Shafer Smith
Biogeosciences, 18, 5831–5849, https://doi.org/10.5194/bg-18-5831-2021, https://doi.org/10.5194/bg-18-5831-2021, 2021
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This study documents and quantifies a significant recent oxygen decline in the upper layers of the Arabian Sea and explores its drivers. Using a modeling approach we show that the fast local warming of sea surface is the main factor causing this oxygen drop. Concomitant summer monsoon intensification contributes to this trend, although to a lesser extent. These changes exacerbate oxygen depletion in the subsurface, threatening marine habitats and altering the local biogeochemistry.
Bjorn Stevens, Sandrine Bony, David Farrell, Felix Ament, Alan Blyth, Christopher Fairall, Johannes Karstensen, Patricia K. Quinn, Sabrina Speich, Claudia Acquistapace, Franziska Aemisegger, Anna Lea Albright, Hugo Bellenger, Eberhard Bodenschatz, Kathy-Ann Caesar, Rebecca Chewitt-Lucas, Gijs de Boer, Julien Delanoë, Leif Denby, Florian Ewald, Benjamin Fildier, Marvin Forde, Geet George, Silke Gross, Martin Hagen, Andrea Hausold, Karen J. Heywood, Lutz Hirsch, Marek Jacob, Friedhelm Jansen, Stefan Kinne, Daniel Klocke, Tobias Kölling, Heike Konow, Marie Lothon, Wiebke Mohr, Ann Kristin Naumann, Louise Nuijens, Léa Olivier, Robert Pincus, Mira Pöhlker, Gilles Reverdin, Gregory Roberts, Sabrina Schnitt, Hauke Schulz, A. Pier Siebesma, Claudia Christine Stephan, Peter Sullivan, Ludovic Touzé-Peiffer, Jessica Vial, Raphaela Vogel, Paquita Zuidema, Nicola Alexander, Lyndon Alves, Sophian Arixi, Hamish Asmath, Gholamhossein Bagheri, Katharina Baier, Adriana Bailey, Dariusz Baranowski, Alexandre Baron, Sébastien Barrau, Paul A. Barrett, Frédéric Batier, Andreas Behrendt, Arne Bendinger, Florent Beucher, Sebastien Bigorre, Edmund Blades, Peter Blossey, Olivier Bock, Steven Böing, Pierre Bosser, Denis Bourras, Pascale Bouruet-Aubertot, Keith Bower, Pierre Branellec, Hubert Branger, Michal Brennek, Alan Brewer, Pierre-Etienne Brilouet, Björn Brügmann, Stefan A. Buehler, Elmo Burke, Ralph Burton, Radiance Calmer, Jean-Christophe Canonici, Xavier Carton, Gregory Cato Jr., Jude Andre Charles, Patrick Chazette, Yanxu Chen, Michal T. Chilinski, Thomas Choularton, Patrick Chuang, Shamal Clarke, Hugh Coe, Céline Cornet, Pierre Coutris, Fleur Couvreux, Susanne Crewell, Timothy Cronin, Zhiqiang Cui, Yannis Cuypers, Alton Daley, Gillian M. Damerell, Thibaut Dauhut, Hartwig Deneke, Jean-Philippe Desbios, Steffen Dörner, Sebastian Donner, Vincent Douet, Kyla Drushka, Marina Dütsch, André Ehrlich, Kerry Emanuel, Alexandros Emmanouilidis, Jean-Claude Etienne, Sheryl Etienne-Leblanc, Ghislain Faure, Graham Feingold, Luca Ferrero, Andreas Fix, Cyrille Flamant, Piotr Jacek Flatau, Gregory R. Foltz, Linda Forster, Iulian Furtuna, Alan Gadian, Joseph Galewsky, Martin Gallagher, Peter Gallimore, Cassandra Gaston, Chelle Gentemann, Nicolas Geyskens, Andreas Giez, John Gollop, Isabelle Gouirand, Christophe Gourbeyre, Dörte de Graaf, Geiske E. de Groot, Robert Grosz, Johannes Güttler, Manuel Gutleben, Kashawn Hall, George Harris, Kevin C. Helfer, Dean Henze, Calvert Herbert, Bruna Holanda, Antonio Ibanez-Landeta, Janet Intrieri, Suneil Iyer, Fabrice Julien, Heike Kalesse, Jan Kazil, Alexander Kellman, Abiel T. Kidane, Ulrike Kirchner, Marcus Klingebiel, Mareike Körner, Leslie Ann Kremper, Jan Kretzschmar, Ovid Krüger, Wojciech Kumala, Armin Kurz, Pierre L'Hégaret, Matthieu Labaste, Tom Lachlan-Cope, Arlene Laing, Peter Landschützer, Theresa Lang, Diego Lange, Ingo Lange, Clément Laplace, Gauke Lavik, Rémi Laxenaire, Caroline Le Bihan, Mason Leandro, Nathalie Lefevre, Marius Lena, Donald Lenschow, Qiang Li, Gary Lloyd, Sebastian Los, Niccolò Losi, Oscar Lovell, Christopher Luneau, Przemyslaw Makuch, Szymon Malinowski, Gaston Manta, Eleni Marinou, Nicholas Marsden, Sebastien Masson, Nicolas Maury, Bernhard Mayer, Margarette Mayers-Als, Christophe Mazel, Wayne McGeary, James C. McWilliams, Mario Mech, Melina Mehlmann, Agostino Niyonkuru Meroni, Theresa Mieslinger, Andreas Minikin, Peter Minnett, Gregor Möller, Yanmichel Morfa Avalos, Caroline Muller, Ionela Musat, Anna Napoli, Almuth Neuberger, Christophe Noisel, David Noone, Freja Nordsiek, Jakub L. Nowak, Lothar Oswald, Douglas J. Parker, Carolyn Peck, Renaud Person, Miriam Philippi, Albert Plueddemann, Christopher Pöhlker, Veronika Pörtge, Ulrich Pöschl, Lawrence Pologne, Michał Posyniak, Marc Prange, Estefanía Quiñones Meléndez, Jule Radtke, Karim Ramage, Jens Reimann, Lionel Renault, Klaus Reus, Ashford Reyes, Joachim Ribbe, Maximilian Ringel, Markus Ritschel, Cesar B. Rocha, Nicolas Rochetin, Johannes Röttenbacher, Callum Rollo, Haley Royer, Pauline Sadoulet, Leo Saffin, Sanola Sandiford, Irina Sandu, Michael Schäfer, Vera Schemann, Imke Schirmacher, Oliver Schlenczek, Jerome Schmidt, Marcel Schröder, Alfons Schwarzenboeck, Andrea Sealy, Christoph J. Senff, Ilya Serikov, Samkeyat Shohan, Elizabeth Siddle, Alexander Smirnov, Florian Späth, Branden Spooner, M. Katharina Stolla, Wojciech Szkółka, Simon P. de Szoeke, Stéphane Tarot, Eleni Tetoni, Elizabeth Thompson, Jim Thomson, Lorenzo Tomassini, Julien Totems, Alma Anna Ubele, Leonie Villiger, Jan von Arx, Thomas Wagner, Andi Walther, Ben Webber, Manfred Wendisch, Shanice Whitehall, Anton Wiltshire, Allison A. Wing, Martin Wirth, Jonathan Wiskandt, Kevin Wolf, Ludwig Worbes, Ethan Wright, Volker Wulfmeyer, Shanea Young, Chidong Zhang, Dongxiao Zhang, Florian Ziemen, Tobias Zinner, and Martin Zöger
Earth Syst. Sci. Data, 13, 4067–4119, https://doi.org/10.5194/essd-13-4067-2021, https://doi.org/10.5194/essd-13-4067-2021, 2021
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The EUREC4A field campaign, designed to test hypothesized mechanisms by which clouds respond to warming and benchmark next-generation Earth-system models, is presented. EUREC4A comprised roughly 5 weeks of measurements in the downstream winter trades of the North Atlantic – eastward and southeastward of Barbados. It was the first campaign that attempted to characterize the full range of processes and scales influencing trade wind clouds.
Damien Couespel, Marina Lévy, and Laurent Bopp
Biogeosciences, 18, 4321–4349, https://doi.org/10.5194/bg-18-4321-2021, https://doi.org/10.5194/bg-18-4321-2021, 2021
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An alarming consequence of climate change is the oceanic primary production decline projected by Earth system models. These coarse-resolution models parameterize oceanic eddies. Here, idealized simulations of global warming with increasing resolution show that the decline in primary production in the eddy-resolved simulations is half as large as in the eddy-parameterized simulations. This stems from the high sensitivity of the subsurface nutrient transport to model resolution.
Pierre Bosser, Olivier Bock, Cyrille Flamant, Sandrine Bony, and Sabrina Speich
Earth Syst. Sci. Data, 13, 1499–1517, https://doi.org/10.5194/essd-13-1499-2021, https://doi.org/10.5194/essd-13-1499-2021, 2021
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In the framework of the EUREC4A campaign, water vapour measurements were retrieved over the tropical west Atlantic Ocean from GNSS data acquired from three research vessels (R/Vs Atalante, Maria S. Merian and Meteor). The retrievals from R/Vs Atalante and Meteor are shown to be of high quality unlike the results for the R/V Maria S. Merian. These ship-borne retrievals are intended to be used for the description and understanding of meteorological phenomena that occurred during the campaign.
Cited articles
Alberto, F., Raimondi, P. T., Reed, D. C., Watson, J. R., Siegel, D. A., Mitarai, S., Coelho, N.,
and Serrão, E. A.: Isolation by oceanographic distance explains genetic
structure for Macrocystis pyrifera in the Santa Barbara Channel, Mol Ecol.,
20, 2543–2554, https://doi.org/10.1111/j.1365-294X.2011.05117.x, 2011.
Berloff, P. S. and McWilliams, J. C.: Material transport in oceanic Gyres,
Part II: Hierarchy of stochastic models, J. Phys. Oceanogr.,
32, 797–830, https://doi.org/10.1175/1520-0485(2002)032<0797:mtiogp>2.0.co;2, 2002.
Bharti, D. K., Katell Guizien, M. T., and Aswathi-Das, P. N.: Vinayachandran,
Kartik Shanker, Connectivity networks and delineation of disconnected
coastal provinces along the Indian coastline using large-scale Lagrangian
transport simulations, Limnology and Oceanography, Assoc.
Sci. Limnol. Oceanogr., 67, 1416–1428,
https://doi.org/10.1002/lno.12092, 2022.
Blanke, B. and S. Raynaud.: Kinematics of the Pacific Equatorial
Undercurrent: An Eulerian and Lagrangian approach from GCM results, J. Phys. Oceanogr., 27, 1038–1053,
https://doi.org/10.1175/1520-0485(1997)027<1038:KOTPEU>2.0.CO;2,
1997.
Blanke, B., Speich, S., Madec, G., and Döös, K.: A global diagnostic
of interocean mass transfers, J. Phys. Oceanogr., 31,
1623–1642,
https://doi.org/10.1175/1520-0485(2001)031<1623:AGDOIM>2.0.CO;2,
2001.
Blanke, B., Bonhommeau, S., Grima, N., and Drillet, Y.: Sensitivity of
advective transfer times across the North Atlantic Ocean to the temporal and
spatial resolution of model velocity data: Implication for European eel
larval transport, Dynam. Atmos. Ocean., 55/56, 22–44,
https://doi.org/10.1016/j.dynatmoce.2012.04.003, 2012.
Cotroneo, Y., Celentano, P., Aulicino, G., Perilli, A., Olita, A., Falco,
P., Sorgente, R., Ribotti, A., Budillon, G., Fusco, G., and Pessini, F.:
Connectivity Analysis Applied to Mesoscale Eddies in the Western
Mediterranean Basin, Remote Sens., 13, 4228,
https://doi.org/10.3390/rs13214228, 2021.
Cowen, R. K., Gawarkiewicz, G., Pineda, J., Thorrold, S., and Werner, F. E.:
Population connectivity in marine systems An Overview, Oceanography, 20,
14–21, 2007.
Dever, E. P., Hendershott, M. C., and Winant, C. D.: Statistical aspects of
surface drifter observations of circulation in the Santa Barbara Channel, J.
Geophys. Res.-Ocean., 103, 24781–24797,
https://doi.org/10.1029/98JC02403, 1998.
Dijkstra, E. W.: A note on two problems in connexion with graphs, Numer.
Math., 1, 269–271, https://doi.org/10.1007/BF01386390, 1959.
Döös, K.: Interocean exchange of water masses, J. Geophys. Res.-Ocean., 100, 13499–13514, https://doi.org/10.1029/95JC00337, 1995.
Drouet, K., Jauzein, C., Herviot-Heath, D., Hariri, S., Laza-Martinez, A.,
Lecadet, C., Seoane, S., Sourisseau, M., Plus, M., Lemée, R., and Siano, R.:
Current distribution and potential expansion of the harmful benthic
dinoflagellate Ostreopsis cf. siamensis towards the warming waters of the
Bay of Biscay, North-East Atlantic, Environ. Microbiol., 23,
4956–4979, https://doi.org/10.1111/1462-2920.15406, 2021.
Fischer, H. B., List, J. E., Koh, R. C., Imberger, J., and Brooks, N. H.:
Mixing in Inland and Coastal Waters, Academic Press, New York,
https://doi.org/10.1016/C2009-0-22051-4, 1979.
Froyland, G. and Padberg, K.: Almost-invariant sets and invariant
manifolds Connecting probabilistic and geometric descriptions of coherent
structures in flows, Physica D, 238, 1507–1523,
https://doi.org/10.1016/j.physd.2009.03.002, 2009.
Froyland, G., Stuart, R. M., and van Sebille, E.: How well-connected
is the surface of the global ocean?, Chaos, 24, 033126, https://doi.org/10.1063/1.4892530, 2014.
Gaylord, B. and Gaines, S. D.: Temperature or transport? Range limits in marine
species mediated solely by flow, Am. Nat., 155, 769–789,
https://doi.org/10.1086/303357, 2000.
Grant, S. B., Kim, J. H., Jones, B. H., Jenkins, S. A., Wasyl, J., and
Cudaback, C.: Surf zone entrainment, along-shore transport, and human health
implications of pollution from tidal outlets, J. Geophys. Res., 110,
C10025, https://doi.org/10.1029/2004JC002401, 2005.
Griffa, A.: Applications of stochastic particle models to oceanographic
problems, in: Stochastic modelling in physical oceanography, edited by: Adler, R. J., Müller, P., and Rozovskii, B. L., 113–140, Birkhäuser
Boston, https://doi.org/10.1007/978-1-4612-2430-3_5, 1996.
Hariri, S.: Near-Surface Transport Properties and Lagrangian Statistics
during Two Contrasting Years in the Adriatic Sea, J. Mar. Sci.
Eng., 8, 681, https://doi.org/10.3390/jmse8090681, 2020.
Hariri, S.: Analysis of Mixing Structures in the Adriatic Sea Using
Finite-Size Lyapunov Exponents, Geophys. Astrophys. Fluid
Dynam., 116, 20–37, https://doi.org/10.1080/03091929.2021.1962851,
2022.
Hariri, S.: Ariane Lagrangian Simulation, Zenodo [code and data set], https://doi.org/10.5281/zenodo.8123776, 2023.
Hariri, S., Besio, G., and Stocchino, A.: Comparison of Finite Time Lyapunov
Exponent and Mean Flow Energy During Two Contrasting Years in the Adriatic
Sea, OCEANS'15 MTS/IEEE, Genoa, Italy, https://doi.org/10.1109/OCEANS-Genova.2015.7271418, 19-21 May 2015.
Hariri, S., Plus, M., Le Gac, M., Séchet, V., Revilla, M., and Sourisseau, M.:
Advection and Composition of Dinophysis spp. Populations Along the European
Atlantic Shelf, Front. Mar. Sci., 9, 914909, https://doi.org/10.3389/fmars.2022.914909,
2022.
James, M. K., Armsworth, P. R., Mason, L. B., and Bode, L.: The Structure
of Reef Fish Metapopulations: Modelling Larval Dispersal and Retention
Patterns, Proceedings: Biological Sciences, 269, 2079–2086,
2002.
Jönsson, B. and Watson, J.: The timescales of global surface-ocean
connectivity, Nat. Commun., 7, 11239, https://doi.org/10.1038/ncomms1123,
2016.
Klocker, A., Ferrari, R., and LaCasce, J. H.: Estimating suppression of
eddy mixing by mean flows, J. Phys. Oceanogr., 42,
1566–1576, https://doi.org/10.1175/JPO-D-11-0205.1, 2012a.
Klocker, A., Ferrari, R., Lacasce, J. H., and Merrifield, S. T.:
Reconciling float-based and tracer-based estimates of lateral diffusivities,
J. Mar. Res., 70, 569–602,
https://doi.org/10.1357/002224012805262743, 2012b.
Kot, C. Y., Åkesson, S., Alfaro-Shigueto, J., Amorocho Llanos, D. F., Antonopoulou, M., Balazs, G. H., Baverstock, W. R., Blumenthal, J. M., Broderick, A. C., Bruno, I., Canbolat, A. F., Casale, P., Cejudo, D., Coyne, M. S., Curtice, C., DeLand, S., DiMatteo, A., Dodge, K., Dunn, D. C., and
Halpin, P. N.: Network analysis of sea turtle movements and connectivity: A tool for conservation prioritization, Divers. Distrib., 28, 810–829, https://doi.org/10.1111/ddi.13485, 2022.
LaCasce, J. H.: Statistics from Lagrangian observations, Prog. Oceanogr.,
77, 1–29, https://doi.org/10.1016/j.pocean.2008.02.002, 2008.
Le Sommer, J., d'Ovidio, F., and Madec, G.: Parameterization of subgrid
stirring in eddy resolving ocean models, Part 1: Theory and diagnostics,
Ocean Model., 39, 154–169,
https://doi.org/10.1016/j.ocemod.2011.03.007, 2011.
Levin, S. A.: The problem of pattern and scale in ecology: The Robert H.
MacArthur Award Lecture, Ecology, 73, 1943–1967,
https://doi.org/10.2307/1941447, 1992.
Lévy, M., Iovino, D., Resplandy, L., Klein, P., Madec, G., Tréguier, A.-M.,
Masson, S., and Takahashi, K.: Large-scale impacts of submesoscale dynamics on
phytoplankton: Local and remote effects, Ocean Model., 43/44,
77–93, https://doi.org/10.1016/j.ocemod.2011.12.003, 2012a.
Lévy, M., Resplandy, L., Klein, P., Capet, X., Iovino, D., and Ethé, C.: Grid
degradation of submesoscale resolving ocean models: Benefits for offline
passive tracer transport, Ocean Model., 48, 1–9,
https://doi.org/10.1016/j.ocemod.2012.02.004, 2012b.
Madec, G., Delecluse, P., Imbard, M., and Lévy, C.: OPA 8.1 Ocean General
Circulation Model Reference Manual, Note du Pole de Modelisation, Institut Pierre-Simon Laplace, 91 pp., 1998.
Mitarai, S., Siegel, D. A., Watson, J. R., Dong, C., and McWilliams, J. C.:
Quantifying connectivity in the coastal ocean with application to the
Southern California Bight, J. Geophys. Res., 114, C10026,
https://doi.org/10.1029/2008JC005166, 2009.
Mora, C., Treml, E. A., Roberts, J., Crosby, K., Roy, D., and Tittensor, D. P.:
High connectivity among habitats precludes the relationship between
dispersal and range size in tropical reef fishes, Ecography, 35, 89–96,
https://doi.org/10.1111/j.1600-0587.2011.06874.x, 2012.
Novi, L., Bracco, A., and Falasca, F.: Uncovering marine connectivity through
sea surface temperature, Sci. Rep., 11, 8839,
https://doi.org/10.1038/s41598-021-87711-z, 2021.
Palumbi, S. R.: Population genetics, demographic connectivity, the design of
marine reserves, Ecol. Appl., 13, 146–158,
https://doi.org/10.1890/1051-0761(2003)013[0146:PGDCAT]2.0.CO;2, 2003.
Piterbarg, L. I.: The top Lyapunov exponent for a stochastic flow modeling
the upper ocean turbulence, SIAM J. Appl. Mathemat., 62,
777–800, https://doi.org/10.1137/S0036139999366401, 2002.
Poulain, P.-M. and Niiler, P.: Statistical-analysis of the surface
circulation in the California Current System using satellite-tracked
drifters, J. Phys. Oceanogr., 19, 1588–1603,
https://doi.org/10.1175/1520-0485(1989)019<1588:SAOTSC>2.0.CO;2,
1989.
Poulain, P.-M. and Hariri, S.: Transit and residence times in the Adriatic
Sea surface as derived from drifter data and Lagrangian numerical
simulations, Ocean Sci., 9, 713–720, https://doi.org/10.5194/os-9-713-2013, 2013.
Pope, S.: Lagrangian PDF methods for turbulent flows, Annu. Rev. Fluid
Mech., 26, 23–63,
https://doi.org/10.1146/annurev.fl.26.010194.000323, 1994.
Reijnders, D., Deleersnijder, E., and van Sebille, E.: Simulating
Lagrangian subgrid-scale dispersion on neutral surfaces in the ocean,
J. Adv. Model. Earth Syst., 14, e2021MS002850,
https://doi.org/10.1029/2021MS002850, 2022.
Reynolds, A.: On Lagrangian stochastic modelling of material transport in
oceanic gyres, Physica D, 172, 124–138,
https://doi.org/10.1016/S0167-2789(02)00660-7, 2002.
Richter, D. J., Watteaux, R., Vannier, T., Leconte, J., Frémont, P.,
Reygondeau, G., Maillet, N., Henry, N., Benoit, G., Da Silva, O., Delmont, T. O., Fernàndez-Guerra, A., Suweis, S., Narci, R., Berney, C., Eveillard, D., Gavory, F., Guidi, L., Labadie, K., Mahieu, E., Poulain, J., Romac, S.,
Roux, S., Dimier, C., Kandels, S., Picheral, M., Searson, S., Tara Oceans Coordinators,
Pesant, S., Aury, J.-M., Brum, J. R., Lemaitre, C., Pelletier, E., Bork, P.,
Sunagawa, S., Lombard, F., Karp-Boss, L., Bowler, C., Sullivan, M. B.,
Karsenti, E., Mariadassou, M., Probert, I., Peterlongo, P., Wincker, P., de
Vargas, C., Ribera d'Alcalà, M., Iudicone, D., and Jaillon, O.: Genomic evidence for global ocean plankton biogeography
shaped by large-scale current systems, eLife, 11, e78129,
https://doi.org/10.7554/eLife.78129, 2022.
Rodean, H. C.: Stochastic Lagrangian models of turbulent diffusion,
American Meteorological Society
Boston, MA, 84 pp., https://doi.org/10.1007/978-1-935704-11-9,
1996.
Rossi, V., Ser-Giacomi, E., López, C., and Hernández-García,
E.: Hydrodynamic provinces and oceanic connectivity from a transport network
help designing marine reserves, Geophys. Res. Lett., 41,
2883–2891, https://doi.org/10.1002/2014GL059540, 2014.
Roughgarden, J., Gaines, S., and Possingham, H.: Recruitment dynamics in
complex life-cycles, Science, 241, 1460–1466,
https://doi.org/10.1126/science.11538249, 1988.
Sawford, B. L.: Reynolds number effects in Lagrangian stochastic models of
turbulent dispersion, Phys. Fluid. A, 3, 1577–1586,
https://doi.org/10.1063/1.857937, 1991.
Ser-Giacomi, E., Baudena, A., Rossi, V., Follows, M., Clayton, S., Vasile, R., López, C., and
Hernández-García, E.: Lagrangian betweenness as a
measure of bottlenecks in dynamical systems with oceanographic examples, Nat.
Commun., 12, 4935, https://doi.org/10.1038/s41467-021-25155-9, 2021a.
Ser-Giacomi, E., Legrand, T., Hernandez-Carrasco, I.,
and Rossi, V.: Explicit and implicit network connectivity: Analytical formulation
and application to transport processes, Phys. Rev. E, 103,
042309, https://doi.org/10.1103/physreve.103.042309, 2021b.
Ser-Giacomi, E., Vasile, R., Hernández-García, E., and
López, C.: Most probable paths in temporal weighted networks:
An application to ocean transport, Phys. Rev. E, 92, 012818,
https://doi.org/10.1103/PhysRevE.92.012818, 2015.
Spivakovskaya, D., Heemink, A. W., and Deleersnijder, E.: Lagrangian
modelling of multi-dimensional advection-diffusion with space-varying
diffusivities: Theory and idealized test cases, Ocean Dynam., 57,
189–203, https://doi.org/10.1007/s10236-007-0102-9, 2007.
Swenson, M. and Niiler, P.: Statistical analysis of the surface circulation
of the California Current, J. Geophys. Res., 101, 22631–22645,
https://doi.org/10.1029/96JC02008, 1996.
Treml, E. A., Halpin, P. N., Urban, D. L., and Pratson, L. F.: Modeling population
connectivity by ocean currents, a graph-theoretic approach for marine
conservation, Landscape Ecol., 23, 19–36,
https://doi.org/10.1007/s10980-007-9138-y, 2008.
Trakhtenbrot, A., Nathan, R., Perry, G., and Richardson. D. M.: The importance of
long-distance dispersal in biodiversity conservation, Divers Distrib.,
11, 173–181, https://doi.org/10.1111/j.1366-9516.2005.00156.x, 2005.
Van Sebille, E., England, E. H., and Froyland, G.: Origin, dynamics and
evolution of ocean garbage patches from observed surface drifters, Environ.
Res. Lett., 7, 044040, https://doi.org/10.1088/1748-9326/7/4/044040,
2012.
Van Sebille, E., Griffies, S. M., Abernathey, R., Adams, T. P., Berloff, P.,
Biastoch, A., Blanke, B., Chassignet, E. P., Cheng, Y., Cotter, C. J., Deleersnijder, E.,
Döös, K., Drake, H. F., Drijfhout, S., Gary, S. F., Heemink, A. W.,
Kjellsson, J., Koszalka, I. M., Lange, M., Lique, C., MacGilchrist, G. A.,
Marsh, R., Mayorga Adame, C. G., McAdam, R., Nencioli, F., Paris, C. B.,
Piggott, M. D., Polton, J. A., Rühs, S., Shah, S. H. A. M., Thomas, M. D.,
Wang, J., Wolfram, P. J., Zanna, L., and Zika, J. D.: Lagrangian ocean analysis: fundamentals and practices,
Ocean Model., 121, 49–75, https://doi.org/10.1016/j.ocemod.2017.11.008,
2018.
Veneziani, M., Griffa, A., Reynolds, A. M., and Mariano, A. J.: Oceanic
turbulence and stochastic models from subsurface Lagrangian data for the
Northwest Atlantic ocean, J. Phys. Oceanogr., 34, 1884–1906,
https://doi.org/10.1175/1520-0485(2004)034<1884:otasmf>2.0.co;2, 2004.
Warner, R. R.: Evolutionary ecology: how to reconcile pelagic dispersal with
local adaptation, Coral Reefs, 16, S115–S120, 1997.
Wang, Y., Raitsos, D. E., Krokos, G., Gittings, J. A., Zhan, P., and Hoteit, I.: Physical connectivity simulations
reveal dynamic linkages between coral reefs in the southern Red Sea and the
Indian Ocean, Sci. Rep., 9, 16598, https://doi.org/10.1038/s41598-019-53126-0,
2019.
Ward, B. A., Cael, B. B., and Robert, Y. C.: Selective constraints on global
plankton dispersal, P. Natl. Acad. Sci. USA, 118, e2007388118, https://doi.org/10.1073/pnas.2007388118, 2021.
Watson, J. R., Hays, C. G., Raimondi, P. T., Mitarai, S., Dong, C.,
McWilliams, J. C., Blanchette, C. A., Caselle, J. E., and Siegel, D. A.:
Currents connecting communities: nearshore community similarity and ocean
circulation, Ecology, 92, 1193–1200, 2011.
Short summary
This work presents a series of studies conducted by the authors on the application of the Lagrangian approach for the connectivity analysis between different ocean locations in an idealized open-ocean model. We assess how the connectivity properties of typical oceanic flows are affected by the fine-scale circulation and discuss the challenges facing ocean connectivity estimates related to the spatial resolution. Our results are important to improve the understanding of marine ecosystems.
This work presents a series of studies conducted by the authors on the application of the...
