Article
Oceanography
Yinghui He, Ming Feng, Jieshuo Xie, Qingyou He, Junliang Liu, Jiexin Xu, Zhiwu Chen, Ying Zhang, Shuqun Cai
Summary: This study investigates the vertical structure of mesoscale eddies in the Leeuwin Current system and their volume, heat, and salt transport using a combination of satellite observations and Argo float data. The results show distinct differences in the vertical structure and impact on coastal transport between anticyclonic and cyclonic eddies in the system.
JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
(2021)
Article
Oceanography
Lansu Wei, Chunzai Wang
Summary: Mesoscale eddies are important in freshwater transport, ocean circulation, and climate. Improved data resolution and detection methods have enhanced the reproduction of eddies in the ocean through observations. This study uses satellite altimeter data to compare two datasets, META and GOMEAD, for analyzing the characteristics of mesoscale eddies in the AL and TL regions. The results show that META is more applicable for detecting small-radius eddies, while GOMEAD offers precise boundaries and is useful for identifying large diameter eddies. Choosing the appropriate dataset is crucial in understanding the role of mesoscale eddies in different areas and a changing climate.
DEEP-SEA RESEARCH PART II-TOPICAL STUDIES IN OCEANOGRAPHY
(2023)
Article
Geosciences, Multidisciplinary
Pierre Damien, Daniele Bianchi, Faycal Kessouri, James C. McWilliams
Summary: Eddies play a crucial role in shaping ocean dynamics and modulating biogeochemical transformation rates. The non-linear nature of nutrient uptake by phytoplankton and the compensation between mesoscale and submesoscale eddies significantly impact primary production and nutrient transport in the California Current System.
GEOPHYSICAL RESEARCH LETTERS
(2023)
Article
Geosciences, Multidisciplinary
Junde Li, Moninya Roughan, Colette Kerry
Summary: The study found that the downstream eddy kinetic energy (EKE) in the Tasman EKE Box region of the East Australian Current (EAC) is modulated by the poleward transport of the EAC, with barotropic instabilities being the primary source of EKE. Anticyclonic eddies dominate during high-EKE periods, shedding from 33 degrees S-36 degrees S, while penetrating further south by about 2 degrees during low-EKE periods.
GEOPHYSICAL RESEARCH LETTERS
(2021)
Article
Oceanography
Hui Zhou, Xueqi Liu, Ruixiang Li, Yonggang Wang, Guang Yang
Summary: The intraseasonal variability of the North Equatorial Current bifurcation latitude is analyzed using observations and reanalysis data. The NBL can reach a maximum amplitude of about 6 degrees of latitude and shows a broad spectral peak around 50-140 days, with significant impacts from the Madden-Julian oscillation and mesoscale eddies. An example of a cyclonic eddy transporting waters to the NBL and causing a northward bifurcation shift of 8 degrees of latitude in 1 month is also provided.
JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
(2021)
Article
Environmental Sciences
Lingjing Xu, Dezhou Yang, Xingru Feng, Junchuan Sun, Guandong Gao, Xuan Cui, Baoshu Yin
Summary: The Kuroshio Current is an important source of nutrients for the East China Sea (ECS) due to the large amount of nutrients it carries. The influence of mesoscale eddies on the Kuroshio nutrient input into the ECS is unknown. A hydrodynamic model with constructed cyclonic and anticyclonic eddies is used to explore this influence. The results show that cyclonic eddies reduce on-shelf phosphate flux, while anticyclonic eddies increase Kuroshio phosphate input to the ECS.
FRONTIERS IN MARINE SCIENCE
(2023)
Article
Environmental Sciences
Kunshan Li, Huan Mei, Xiangbai Wu, Jianxin Dong, Qian Liu
Summary: The study investigates the hysteresis of a western boundary current (WBC) flowing across a gap and its interaction with mesoscale eddies in the presence of two islands. The results show that the islands facilitate the WBC to intrude into the western basin by shedding eddies, but promote the WBC to leap across the gap. The dynamics are revealed through vorticity balance analysis, indicating that the meridional advection perturbed by eddy forces determines whether the WBC leaps across or intrudes into the gap.
FRONTIERS IN MARINE SCIENCE
(2023)
Article
Geosciences, Multidisciplinary
Nathali Cordero Quiros, Michael G. Jacox, Mercedes Pozo Buil, Steven J. Bograd
Summary: This study explores the future changes in eddy kinetic energy in the California Current System and finds that the energy will increase towards the end of the century. The study also reveals a close correlation between the increase in eddy kinetic energy and the stratification of the ocean.
GEOPHYSICAL RESEARCH LETTERS
(2022)
Review
Oceanography
Itsuka Yabe, Yusuke Kawaguchi, Taku Wagawa, Shinzou Fujio
Summary: This study, based on satellite data, clarifies the complex ocean currents in the Sea of Japan, identifies the main pathways of the Tsushima Warm Current system, and explores the seasonal variations of the currents. The characteristics and behaviors of the currents vary in different regions, with the offshore branches in the Yamato Basin strongly affected by mesoscale eddies, and the branches in the eastern Sea of Japan meandering during winter.
PROGRESS IN OCEANOGRAPHY
(2021)
Article
Oceanography
Zhao-Jun Liu, Xiao-Hua Zhu, Hirohiko Nakamura, Min Wang, Ayako Nishina, Yu-Xiang Qiao, Ze-Nan Zhu
Summary: This study utilized reanalysis data to reveal a noticeable weakening trend in the subsurface velocity core of the Ryukyu Current during 1993-2018. The weakened Ryukyu Current was instigated by the combined effect of the topographic Rossby wave originating in the straits of the Ryukyu Island chain, and the increasing anticyclonic eddy emanating from the interior region east of the Kuroshio Extension. The former processes led the onshore side of the isopycnal to shoal, while the latter process induces the isopycnal to deepen on the offshore side. The isopycnal near the Ryukyu Current velocity core becomes less steep, thereby weakening the subsurface Ryukyu Current.
JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
(2022)
Article
Oceanography
Igor Uchoa, Iury T. Simoes-Sousa, Ilson C. A. da Silveira
Summary: This study characterizes the variability of mesoscale eddies in the Brazil Current, finding that their formation is correlated with seasons and geographic locations. The Vitoria, Cape Sao Tome, and Cape Frio Eddies are important features of these eddies. The study also reveals that while most eddies are considered quasi-stationary, the Vitoria, Cape Sao Tome, and Cape Frio Eddies can detach and migrate off the mean current axis.
DEEP-SEA RESEARCH PART I-OCEANOGRAPHIC RESEARCH PAPERS
(2023)
Article
Geosciences, Multidisciplinary
Xiao Chen, Christina Schallenberg, Helen Phillips, Zanna Chase
Summary: In this study, physical and biogeochemical properties of mesoscale eddies in the East Australian Current were characterized using ship-based and satellite measurements in the austral fall of 2018. The study revealed deep chlorophyll maxima and primary nitrite maxima, indicating an optimization of light and nitrogen supply by phytoplankton. These findings suggest that surface cooling and seasonal cooling in the region led to increased convection and nutrient injection, influencing the productivity and biomass of the eddies.
JOURNAL OF MARINE SYSTEMS
(2021)
Article
Ecology
Pierre Damien, Julio Sheinbaum, Orens Pasqueron de Fommervault, Julien Jouanno, Lorena Linacre, Olaf Duteil
Summary: Long-living anticyclonic Loop Current eddies play a significant role in driving biogeochemical variability within the Gulf of Mexico, particularly during winter when they foster a large biomass increase in the upper ocean. These eddies exhibit anomalous surface chlorophyll distribution all year long, with primary production higher than surrounding open waters.
Article
Limnology
Yunlong Shi, Dezhou Yang, Yijun He
Summary: The study investigates the interaction between mesoscale eddies and the Kuroshio Current east of Taiwan, showing significant variations in the spatial structure and volume transport of the Kuroshio Current when eddies collide with it. The dynamic mechanism analysis reveals that the interaction between the Kuroshio Current and cyclonic or anticyclonic eddies can impact the ability of eddies to cross the current by altering the horizontal potential vorticity gradient.
JOURNAL OF OCEANOLOGY AND LIMNOLOGY
(2021)
Article
Marine & Freshwater Biology
Aleksandr A. Nikitin, Irina L. Tsypysheva, Yury I. Zuenko
Summary: The spatial patterns of the Primorye Current along the coast of the Primorye region in the northwest East/Japan Sea were studied using satellite images and standard measurements. The results showed that the cold-water band of the Primorye Current is not originated from the Okhotsk Sea as previously believed, but rather from the external shelf of Primorye. The shape of the cold-water area is complex and variable, often appearing as chains of eddies or filaments. The occurrence of the cold-water zone is influenced by large anticyclonic eddies in summer and upwellings in fall.
OCEAN SCIENCE JOURNAL
(2023)
Article
Oceanography
J. U. N. D. E. LI, M. O. N. I. N. Y. A. Roughan
Summary: Examining eddy-mean flow interactions is crucial for understanding mesoscale eddy generation and the role of eddies in large-scale circulation. However, this analysis is lacking in the East Australian Current (EAC) system. This study provides detailed 3D structure and energy budget of eddy-mean flow interactions in the EAC, revealing important patterns and processes.
JOURNAL OF PHYSICAL OCEANOGRAPHY
(2023)
Review
Oceanography
Taryn Laubenstein, Timothy F. Smith, Alistair J. Hobday, Gretta T. Pecl, Karen Evans, Elizabeth A. Fulton, Tayanah O'Donnell
Summary: Oceans and coasts are facing increasing threats from human activities, including recreational activities, pollution, and urban development. These threats have impacts on environmental, economic, socio-cultural, and Indigenous values. It is important to understand and address these threats to protect the ecological sustainability of ocean and coastal systems.
OCEAN & COASTAL MANAGEMENT
(2023)
Article
Oceanography
Giselle F. Firme, David J. Hughes, Leonardo Laiolo, Moninya Roughan, Iain M. Suthers, Martina A. Doblin
Summary: Mesoscale eddies play a significant role in driving variability in phytoplankton functional trait composition and primary productivity relative to adjacent waters. In the offshore waters of southeast Australia, these eddies provide an important enrichment mechanism in nitrogen-limited areas, but there is limited knowledge about primary productivity within cold and warm-core eddies and the factors that affect phytoplankton communities in this variable environment. This study quantified net primary productivity and compared phytoplankton species composition in five different environments, highlighting the importance of cold-core eddies in regulating primary productivity in eastern Australian waters and the need to incorporate phytoplankton size structure in eddy-resolving models for accurate forecasts.
DEEP-SEA RESEARCH PART I-OCEANOGRAPHIC RESEARCH PAPERS
(2023)
Article
Marine & Freshwater Biology
Kylie A. Pitt, Jonathan W. Lawley, Charles Hinchliffe, Paloma A. Matis, Carolina Olguin-Jacobson, Nur Arafeh-Dalmau, Pauline Lindholm, Jade Arnold, Iain M. Suthers
Summary: Mesoscale oceanographic features influence the composition of zooplankton. Cyclonic eddies promote upwelling and production of gelatinous zooplankton. Thaliaceans (salps, doliolids, and pyrosomes) show variation in assemblages among different oceanographic features. Salps and doliolids are most abundant in coastal features, while pyrosomes are most abundant in oligotrophic waters.
JOURNAL OF PLANKTON RESEARCH
(2023)
Review
Limnology
Iain M. Suthers, Amandine Schaeffer, Matthew Archer, Moninya Roughan, David A. Griffin, Christopher C. Chapman, Bernadette M. Sloyan, Jason D. Everett
Summary: Frontal eddies formed by boundary currents provide suitable offshore nursery habitats for zooplankton and larval fish, contributing to enhanced fisheries production and connectivity of coastal ecosystems.
LIMNOLOGY AND OCEANOGRAPHY
(2023)
Article
Environmental Sciences
Ryan F. Heneghan, Jason D. Everett, Julia L. Blanchard, Patrick Sykes, Anthony J. Richardson
Summary: Using a trait-based marine ecosystem model, the study reveals that future oceans, especially in tropical regions, will favor food webs dominated by carnivorous and gelatinous filter-feeding zooplankton, which will partially offset the decline in phytoplankton biomass and increase in carnivorous zooplankton. However, this shift will result in decreased carrying capacity for future fish communities and less nutritious food, exacerbating projected declines in small pelagic fish biomass in tropical regions by 2100.
NATURE CLIMATE CHANGE
(2023)
Article
Oceanography
Neil Malan, Moninya Roughan, Michael Hemming, Amandine Schaeffer
Summary: Understanding the distribution of chlorophyll in the continental shelves adjacent to western boundary currents is crucial for ecosystem studies and carbon dioxide uptake. This study utilizes more than a decade of underwater glider observations in the East Australian Current system to investigate the impact of mesoscale western boundary current circulation on chlorophyll distribution. The results highlight the persistent spatial influence of boundary current separation on stratification and chlorophyll distribution, emphasizing the importance of considering WBC dynamics for accurate estimates of CO2 uptake.
JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
(2023)
Article
Environmental Sciences
Xianglin Ren, Wei Liu, Antonietta Capotondi, Dillon J. Amaya, Neil J. Holbrook
Summary: The Pacific Decadal Oscillation (PDO) plays a crucial role in driving marine heatwaves in the Northeast Pacific. Through observations and climate model simulations, it is found that marine heatwaves become longer, stronger, and more frequent during positive PDO periods. This is mainly due to the higher coastal sea surface temperatures caused by reduced cold upwelling and increased surface heat flux during positive PDO phases. In the period of 2013-2022, the positive PDO prolongs marine heatwaves duration by up to 43% and increases their annual frequency by up to 32% off the Northeast Pacific coast, relative to anthropogenic global warming.
COMMUNICATIONS EARTH & ENVIRONMENT
(2023)
Article
Environmental Sciences
Se-Yong Song, Sang-Wook Yeh, Hyerim Kim, Neil J. J. Holbrook
Summary: An increase in the number of marine heatwave days in the Northeast Pacific ocean has been observed and is believed to be linked to Arctic warming and sea ice decline. The analysis of satellite-derived and reanalysis data, along with climate model experiments, shows that the frequency and duration of marine heatwaves have been increasing due to ocean warming from climate change. Strong Arctic warming has altered the atmospheric circulation pattern over the Northeast Pacific, leading to reduced cloud cover and increased sea surface temperatures, favoring the occurrence of marine heatwaves. The findings highlight the importance of considering the projected changes in Arctic climate in climate change adaptation and mitigation plans.
COMMUNICATIONS EARTH & ENVIRONMENT
(2023)
Article
Multidisciplinary Sciences
Alvise Dabala, Farid Dahdouh-Guebas, Daniel C. Dunn, Jason D. Everett, Catherine E. Lovelock, Jeffrey O. Hanson, Kristine Camille V. Buenafe, Sandra Neubert, Anthony J. Richardson
Summary: Anthropogenic activities pose a threat to global biodiversity and ecosystem services. However, current conservation efforts focus on biodiversity protection and overlook ecosystem services. This study demonstrates the importance of incorporating ecosystem services into protected area design, and highlights the potential benefits of strategic prioritization and coordination of mangrove conservation.
NATURE COMMUNICATIONS
(2023)
Article
Ecology
Claire Mason, Alistair J. Hobday, Mary-Anne Lea, Rachael Alderman
Summary: This study analyzed the foraging behavior of shy albatross from Albatross Island. The results showed a consistent foraging area for the population, with individuals utilizing both the shelf break and the Bass Strait. There was also evidence of individual consistency to geographic locations. Age and sex did not explain the between-individual variation in foraging behavior.
ECOLOGY AND EVOLUTION
(2023)
Review
Limnology
Laura E. Lilly, Iain M. Suthers, Jason D. Everett, Anthony J. Richardson
Summary: Pyrosomes are colonial tunicates that form gelatinous tubes and occasionally produce bioluminescent swarms. They have the potential to outcompete other zooplankton, restructure marine food webs, enhance carbon export, and interfere with human activities. However, much remains unknown about their physiology, bloom mechanisms, and ecosystem impacts. Expanding our knowledge of pyrosomes is needed to include them in ecosystem models and forecasts of future population distributions.
LIMNOLOGY AND OCEANOGRAPHY LETTERS
(2023)
Article
Geosciences, Multidisciplinary
Joao Marcos Azevedo Correia de Souza, Sutara H. Suanda, Phellipe P. Couto, Robert O. Smith, Colette Kerry, Moninya Roughan
Summary: This study presents the first open-access long-term 3D hydrodynamic ocean hindcast for the New Zealand ocean estate. The model simulation is consistent with observations and represents important ocean processes at different temporal and spatial scales.
GEOSCIENTIFIC MODEL DEVELOPMENT
(2023)
Article
Geosciences, Multidisciplinary
David E. Gwyther, Shane R. Keating, Colette Kerry, Moninya Roughan
Summary: Accurate estimates and forecasts of ocean eddies, which are important for various fields such as weather, biology, navigation, and search and rescue, require data assimilation. However, the impact of data assimilation on subsurface eddy structure is not well understood due to limited observations. This study shows how data assimilation affects the representation of subsurface eddies in ocean model simulations.
GEOSCIENTIFIC MODEL DEVELOPMENT
(2023)
Article
Oceanography
Jason A. Law, Robert H. Weisberg, Yonggang Liu, Dennis A. Mayer, Jeffrey C. Donovan
Summary: Time series data from a moored array of sensors are used to describe the long-term mean circulation and seasonal variations on the West Florida Continental Shelf. The observations reveal a coherent shelf-wide circulation pattern with alongshore and down-coast flow, and a coastal jet separating an upwelling region from a downwelling region influenced by the deeper ocean.
DEEP-SEA RESEARCH PART II-TOPICAL STUDIES IN OCEANOGRAPHY
(2024)