Article
Environmental Sciences
Arthur Capet, Guillaume Taburet, Evan Mason, Marie Isabelle Pujol, Marilaure Gregoire, Marie-Helene Rio
Summary: This study evaluates different altimetry data sets for the Black Sea and compares their suitability in characterizing subsurface oxygen and salinity signatures induced by eddies. The authors propose that the theoretical consistency and estimated error of the reconstructed mean anomaly can be used to assess the accuracy of gridded altimetry products, and that BGC-Argo data are valuable in this regard.
FRONTIERS IN MARINE SCIENCE
(2022)
Article
Oceanography
Ge Chen, Xiaoyan Chen, Baoxiang Huang
Summary: A methodology to expand eddy tracking capacity is proposed by utilizing altimetrically calibrated Argo measurements, aiming to tackle the issue of missed oceanic eddies due to inadequate spatiotemporal sampling by available altimeters. The independent identification scheme relates the surface signature of eddies to their interior property, effectively identifying additional eddies overlooked by altimeters and rectifying their ineffectiveness in certain regions. The approach demonstrates a highly complementary nature of combining altimetry and Argo profiling arrays for eddy identification.
JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
(2021)
Article
Oceanography
Sophie Stolzenberger, Roelof Rietbroek, Claudia Wekerle, Bernd Uebbing, Juergen Kusche
Summary: This study explores the visibility of Greenland melting signatures in observations. It finds that Greenland freshwater flux affects temperature and salinity, especially in the vicinity of Greenland, and the melting signatures are particularly visible in steric heights in Baffin Bay and Davis Strait.
JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
(2022)
Review
Environmental Sciences
Nathalie V. Zilberman, Virginie Thierry, Brian King, Matthew Alford, Xavier Andre, Kevin Balem, Nathan Briggs, Zhaohui Chen, Cecile Cabanes, Laurent Coppola, Giorgio Dall'Olmo, Damien Desbruyeres, Denise Fernandez, Annie Foppert, Wilford Gardner, Florent Gasparin, Bryan Hally, Shigeki Hosoda, Gregory C. Johnson, Taiyo Kobayashi, Arnaud Le Boyer, William Llovel, Peter Oke, Sarah Purkey, Elisabeth Remy, Dean Roemmich, Megan Scanderbeg, Philip Sutton, Kamila Walicka, Luke Wallace, Esmee M. van Wijk
Summary: The ocean serves as the primary heat reservoir in Earth's climate system, influencing global sea level and climate patterns. However, current ocean observing networks have limited sampling of the deep ocean, highlighting the need for new platforms and strategies to obtain comprehensive data.
FRONTIERS IN MARINE SCIENCE
(2023)
Article
Geosciences, Multidisciplinary
Jiaoyang Su, Peter G. Strutton, Christina Schallenberg
Summary: Mesoscale eddies in the Southern Ocean play a key role in redistributing momentum, potential vorticity, heat, and salt, and also have an impact on subsurface biological structures. Eddy pumping, eddy-induced Ekman pumping, and deep vertical mixing are the main mechanisms sustaining high chlorophyll in eddies.
JOURNAL OF MARINE SYSTEMS
(2021)
Article
Oceanography
Peter G. G. Strutton, Thomas W. W. Trull, Helen E. E. Phillips, Earl R. R. Duran, Sylvia Pump
Summary: Eddies in the southeast Indian Ocean play a role in modulating open ocean productivity, with their impact depending on their source and evolution. These eddies can stimulate and sustain phytoplankton, allowing their effects to persist over long distances. Measurements from autonomous floats show that chlorophyll and particulate organic carbon become concentrated at the base of the mixed layer as eddies are transported westward. The subsurface biomass maxima in both anticyclonic and cyclonic eddies remain active over several months, suggesting a mechanism for long-distance transfer of eddy plankton communities not captured by satellite remote sensing.
JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
(2023)
Article
Environmental Sciences
Jiagen Li, Han Zhang, Shanshan Liu, Xiuting Wang, Liang Sun
Summary: Four sequential tropical cyclones in 2014 had significant impacts on the oceanic environment and coastal regions in the Northwest Pacific Ocean. The ocean responses to these typhoons depended on the intensity, track order, and ocean mesoscale eddies, with cold wake caused by the first typhoon inducing different feedback effects on subsequent typhoons.
Article
Oceanography
Matthew R. Mazloff, Ariane Verdy, Sarah T. Gille, Kenneth S. Johnson, Bruce D. Cornuelle, Jorge Sarmiento
Summary: Since 2014, Argo floats equipped with BGC sensors have been measuring pH levels in the Southern Ocean. This study presents a climatology of Southern Ocean pH from 2014 to 2019 and explains the method used to construct this product. Comparison with previous ship-based measurements reveals a decrease in pH levels over time, with the strongest trends observed in surface and downwelling waters. The findings allow for a quantification of the structure of Southern Ocean acidification.
JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
(2023)
Article
Oceanography
M. F. Azis Ismail, J. Ribbe, T. Arifin, A. Taofiqurohman, D. Anggoro
Summary: The Indo-Australian Basin (IAB) is a critical water route connecting the Pacific and Indian Oceans, where locally generated eddies contribute to westward water transport. A total of 2,792 eddies were identified and tracked, showing differences in dynamic characteristics, formation, and distribution. Larger eddies with higher kinetic energy are associated with specific current regions, providing new insights into their physical characteristics.
JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
(2021)
Article
Ecology
Shuangling Chen, Mark L. Wells, Rui Xin Huang, Huijie Xue, Jingyuan Xi, Fei Chai
Summary: Subduction associated with mesoscale eddies is identified as a significant process for exporting carbon and oxygen to the mesopelagic zone. Episodic subduction patches were found in the Kuroshio Extension region, mainly occurring between March and August. These events are estimated to significantly increase oxygen ventilation and carbon removal in the region, with potential for future growth due to climate-driven changes in eddy kinetic energies.
Article
Environmental Sciences
Xingnan Fang, Wei Yu, Xinjun Chen, Yang Zhang
Summary: The study detected eddy characteristics on the fishing ground of the Humboldt squid in the eastern equatorial Pacific Ocean based on geometrical characteristics with the flow field. The eddies were found to have a significant impact on D. gigas abundance and habitat distribution by promoting the transportation of deep nutrient-rich waters into the euphotic layer and creating favorable water temperature conditions for D. gigas.
FRONTIERS IN MARINE SCIENCE
(2021)
Article
Environmental Sciences
Rui Nian, Xue Geng, Zhengguang Zhang, Minghan Yuan, Zhen Fu, Hengfu Xu, Hua Yang, Qi Lai, Hui He, Chi Wei Su, Lina Zang, Qiang Yuan, Bo He
Summary: In this study, the authors investigated the influence of a meridional ridge on the evolution and propagation of mesoscale eddies in the ocean. They found a significant correlation between the attributes of the eddies and the topographic relief of the ridge. Cyclonic eddies tended to weaken or decay, while anticyclonic eddies slightly intensified when encountering an upslope. Eddies that passed over the ridge exhibited larger scales, amplitudes, and rotation speeds compared to those that only partially passed. This research provides insights into how mesoscale eddies respond to topographic effects and can potentially contribute to understanding the dynamic patterns and mechanisms of ocean dynamics.
FRONTIERS IN MARINE SCIENCE
(2022)
Article
Environmental Sciences
Habib Micael A. Aguedjou, Alexis Chaigneau, Isabelle Dadou, Yves Morel, Ezinvi Baloitcha, Casimir Y. Da-Allada
Summary: This study examines the impact of mesoscale eddies on air-sea heat and fresh water exchange in the tropical Atlantic Ocean using satellite altimetry data, SST, LHF, SHF, IRF and PR data. The findings reveal that approximately 40% of cyclonic eddies contribute to warm SST anomalies, while 40% of anticyclonic eddies contribute to cold SST anomalies. Eddies play a role in the variability of LHF, SHF, and IRF, with the largest contributions observed in the intertropical convergence zone and frontal SST areas.
Article
Oceanography
J. Uitz, C. Roesler, E. Organelli, H. Claustre, C. Penkerch, S. Drapeau, E. Leymarie, A. Poteau, C. Schmechtig, C. Dimier, J. Ras, X. Xing, S. Blain
Summary: The Southern Ocean is characterized by atypical bio-optical properties, which makes it challenging to interpret optical measurements obtained from satellite and in situ platforms. A ship-based field study and observations from BioGeoChemical-Argo profiling floats were used to investigate the spatial and temporal variations in bio-optical relationships in the Indian sector of the Southern Ocean. The study found consistent anomalies in chlorophyll-specific phytoplankton absorption and backscattering coefficient, which were correlated with phytoplankton size, photoacclimation, and nutrient levels.
JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
(2023)
Article
Meteorology & Atmospheric Sciences
Wenda Zhang, Christopher L. P. Wolfe
Summary: Isopycnal mixing of tracers is important for ocean dynamics and biogeochemistry. This study investigates the vertical structure of the isopycnal tracer diffusivity and finds that isopycnal mixing is anisotropic and can be reconstructed from the along-stream diffusivity after accounting for suppression of mixing by the mean flow. The results provide important information for parameterizing the vertical structure of isopycnal mixing in ocean models.
JOURNAL OF ADVANCES IN MODELING EARTH SYSTEMS
(2022)
Article
Green & Sustainable Science & Technology
Osvaldo Artal, Oscar Pizarro, Hector H. Sepulveda
Article
Oceanography
Richard J. Brokaw, Bulusu Subrahmanyam, Corinne B. Trott, Alexis Chaigneau
JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
(2020)
Article
Marine & Freshwater Biology
Anahi A. Brun, Nadin Ramirez, Oscar Pizarro, Alberto R. Piola
ESTUARINE COASTAL AND SHELF SCIENCE
(2020)
Article
Oceanography
R. Sosa-Gutierrez, E. Pallas-Sanz, J. Jouanno, A. Chaigneau, J. Candela, M. Tenreiro
JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
(2020)
Article
Marine & Freshwater Biology
Olaegbe Victor Okpeitcha, Alexis Chaigneau, Yves Morel, Thomas Stieglitz, Yves Pomalegni, Zacharie Sohou, Daouda Mama
Summary: Nokoue Lagoon in the South of Benin is a large intermittent coastal water body in West Africa, which supports one of the largest inland fisheries of the region. The study reveals the seasonal and interannual variability of its salinity, influenced by freshwater inflows from rivers and ocean tides.
ESTUARINE COASTAL AND SHELF SCIENCE
(2022)
Article
Oceanography
H. M. A. Aguedjou, A. Chaigneau, I Dadou, Y. Morel, C. Pegliasco, C. Y. Da-Allada, E. Baloitcha
Summary: Based on 18 years of satellite altimetry data and temperature/salinity profiles, this study analyzes the isopycnal theta/S anomalies within newborn eddies in the tropical Atlantic Ocean. The results show that both anticyclonic and cyclonic eddies can exhibit different theta'/S' on density-coordinates. With more than 70% of the eddies showing a subsurface signature, the study proposes to combine theta'/S' and PV anomalies to analyze the potential processes involved in their transformation in the ocean.
JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
(2021)
Article
Marine & Freshwater Biology
Alexis Chaigneau, Olaegbe Victor Okpeitcha, Yves Morel, Thomas Stieglitz, Arnaud Assogba, Morgane Benoist, Pierre Allamel, Jules Honfo, Thierry Derol Awoulmbang Sakpak, Fabien Retif, Thomas Duhaut, Christophe Peugeot, Zacharie Sohou
Summary: This study investigated the main water-level variability modes of Nokoue Lagoon in Benin. Seasonal and weak interannual variations are mainly influenced by rainfall regime and river inflow, while tidal conditions vary with river inflow and ocean tide amplitude. Diurnal modulation and asymmetry of the tide are stronger during high water period.
ESTUARINE COASTAL AND SHELF SCIENCE
(2022)
Article
Environmental Sciences
Susannah J. Buchan, Laura Gutierrez, Mark F. Baumgartner, Kathleen M. Stafford, Nadin Ramirez, Oscar Pizarro, Jose Cifuentes
Summary: This study examines the distribution of blue and sei whales in the northern Chilean Patagonia and their relationship with oceanographic conditions. The findings show that Southeast Pacific blue whales are present throughout the study area, while sei whales exhibit high interannual variability in their acoustic presence. This research is important for understanding the behavior and ecological relationship of these whale species with their environment.
FRONTIERS IN MARINE SCIENCE
(2022)
Article
Environmental Sciences
Habib Micael A. Aguedjou, Alexis Chaigneau, Isabelle Dadou, Yves Morel, Ezinvi Baloitcha, Casimir Y. Da-Allada
Summary: This study examines the impact of mesoscale eddies on air-sea heat and fresh water exchange in the tropical Atlantic Ocean using satellite altimetry data, SST, LHF, SHF, IRF and PR data. The findings reveal that approximately 40% of cyclonic eddies contribute to warm SST anomalies, while 40% of anticyclonic eddies contribute to cold SST anomalies. Eddies play a role in the variability of LHF, SHF, and IRF, with the largest contributions observed in the intertropical convergence zone and frontal SST areas.
Article
Environmental Sciences
David Carrasco, Oscar Pizarro, Martin Jacques-Coper, Diego A. Narvaez
Summary: During the last decades, marine heat waves (MHWs) have increased in frequency and duration, with important impacts on marine ecosystems. This trend has been related to rising global sea surface temperatures, which are expected to continue in the future. MHWs in the eastern South Pacific off Chile are closely related to ENSO cycles, and their main drivers include air-sea heat fluxes and heat advection.
FRONTIERS IN MARINE SCIENCE
(2023)
Article
Engineering, Marine
Alexis Chaigneau, Francois Talomonwo Ouinsou, Herve Hotekpo Akodogbo, Gauthier Dobigny, Thalasse Tchemangnihode Avocegan, Fridolin Ubald Dossou-Sognon, Victor Olaegbe Okpeitcha, Metogbe Belfrid Djihouessi, Frederic Azemar
Summary: This study investigated the seasonal variation of zooplankton diversity and abundance in the Nokoue Lagoon in southern Benin. The results showed that salinity was the key factor driving the structure of zooplanktonic communities, which exhibited significant seasonal variation. It was found that during the high water period, rotifers were dominant, zooplanktonic diversity was highest, and abundances were quite high, while during the low water period, diversity decreased slightly. The study also revealed the potential influence of other factors such as riverine inputs or the presence of acadjas on the zooplankton community.
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2023)
Article
Environmental Sciences
Matias Pizarro-Koch, Oscar Pizarro, Boris Dewitte, Ivonne Montes, Aurelien Paulmier, Veronique Garcon, Hector Hito Sepulveda, Andrea Corredor-Acosta, Catalina Aguirre, Marcel Ramos
Summary: In this study, the variability of the subtropical OMZ off central Chile was analyzed using a regional coupled physical-biogeochemical model. The results showed that the fluctuations of the OMZ were significant, and were caused by the interaction between seasonal changes and oceanic circulation.
FRONTIERS IN MARINE SCIENCE
(2023)
Article
Environmental Sciences
Boris Dewitte, Emilio Concha, Diego Saavedra, Oscar Pizarro, Cristian Martinez-Villalobos, Daria Gushchina, Marcel Ramos, Aldo Montecinos
Summary: This study investigates the relationship between El Nino Southern Oscillation (ENSO) and the South Pacific Meridional Mode (SPMM) by focusing on strong SPMM events following strong El Nino events. The research finds that there is a stationary relationship between ENSO and SPMM in both observations and simulations. Strong SPMM events are associated with coastal warming off northern central Chile, caused by waves forced at the equator during El Nino events. The time delay between ENSO peak and this coastal warming can be explained by the differential contribution of equatorially-forced propagating waves. Few models accurately simulate this ENSO/SPMM relationship and its oceanic teleconnection.
FRONTIERS IN CLIMATE
(2023)
Article
Physics, Fluids & Plasmas
Fernand Assene, Yves Morel, Audrey Delpech, Micael Aguedjou, Julien Jouanno, Sophie Cravatte, Frederic Marin, Claire Menesguen, Alexis Chaigneau, Isabelle Dadou, Gael Alory, Ryan Holmes, Bernard Bourles, Ariane Koch-Larrouy
Review
Environmental Sciences
Veronique Garcon, Johannes Karstensen, Artur Palacz, Maciej Telszewski, Tony Aparco Lara, Denise Breitburg, Francisco Chavez, Paulo Coelho, Marcela Cornejo-D'Ottone, Carmen Santos, Bjoern Fiedler, Natalya D. Gallo, Marilaure Gregoire, Dimitri Gutierrez, Martin Hernandez-Ayon, Kirsten Isensee, Tony Koslow, Lisa Levin, Francis Marsac, Helmut Maske, Baye C. Mbaye, Ivonne Montes, Wajih Naqvi, Jay Pearlman, Edwin Pinto, Grant Pitcher, Oscar Pizarro, Kenneth Rose, Damodar Shenoy, Anja Van der Plas, Melo R. Vito, Kevin Weng
FRONTIERS IN MARINE SCIENCE
(2019)