Article
Oceanography
Katherine D. Zaba, Peter J. S. Franks, Mark D. Ohman
Summary: In the California Current System, the Morro Bay filament is an important coastal upwelling feature characterized by enhanced cross-filament gradients, which have significant impacts on the cross-shore fluxes of physical, biological, and chemical tracers.
JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
(2021)
Article
Environmental Sciences
Alice S. Ren, Daniel L. Rudnick
Summary: A study found that the California Current System in the eastern North Pacific Ocean experienced a substantial positive salinity anomaly from 2017-2019, indicating a potential change in source waters.
COMMUNICATIONS EARTH & ENVIRONMENT
(2021)
Article
Geosciences, Multidisciplinary
Hui Ding, Michael A. Alexander, Michael G. Jacox
Summary: This study highlights the importance of considering ocean circulation in quantifying upwelling and its variability and change. The roles of Ekman and geostrophic transports in coastal upwelling change under global warming are investigated, with findings showing that neglecting geostrophic currents can lead to substantial inaccuracies in projections of coastal upwelling change in the California Current System.
GEOPHYSICAL RESEARCH LETTERS
(2021)
Article
Limnology
Ivia Closset, Heather M. McNair, Mark A. Brzezinski, Jeffrey W. Krause, Kimberlee Thamatrakoln, Janice L. Jones
Summary: The California Current System experiences strong seasonal variations in water properties, circulation, and productivity, with a warm anomaly known as the Blob affecting upwelling dynamics and diatom production. The nutrient supply to the euphotic zone decreased by 50% during the Blob, but local production during individual upwelling events was minimally impacted. Persistent biological hotspots with high biomass, depleted nutrients, and high specific production rates were observed throughout the study period.
LIMNOLOGY AND OCEANOGRAPHY
(2021)
Review
Oceanography
Lionel Renault, James C. McWilliams, Faycal Kessouri, Alexandre Jousse, Hartmut Frenzel, Ru Chen, Curtis Deutsch
Summary: This paper presents a 16-year hindcast solution of the California Current System using a coupled physical and biogeochemical model along the U.S. West Coast. The model is validated against various fields and shows good agreement with observational data. The simulation highlights the importance of high-resolution atmospheric and oceanic models for accurately representing oceanic processes and interactions.
PROGRESS IN OCEANOGRAPHY
(2021)
Article
Oceanography
A. L. Jamil, M. T. Kavanaugh, Y. H. Spitz
Summary: Oceanic fronts are important features in marine ecosystems as they mark the boundary between two water masses and serve as sites of complex bio-physical processes and multi-trophic level interactions. This study focuses on the dynamic northern extent of the California Current System and investigates the variability of mesoscale sea surface temperature (SST) and chlorophyll-a (chl-a) fronts over a 17-year period. The results show that SST fronts are frequent and distributed offshore, while chl-a fronts occur mainly along the continental shelf break. The influence of local- and basin-scale processes on frontal variability is also examined, with local wind stress and wind stress curl variability identified as the most influential drivers over the shelf, and basin-scale climate variability significantly impacting frontal occurrences along the shelf break and offshore.
JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
(2023)
Article
Environmental Sciences
Deoksu Kim, Jang-Geun Choi, Jinku Park, Jae-Il Kwon, Myeong-Hyeon Kim, Young-Heon Jo
Summary: This study aims to estimate the factors affecting upwelling processes using the Upwelling Age index. The findings reveal that wind-driven upwelling was dominant off the northern coast, while current-driven upwelling prevailed off the southern coast. These results shed light on the influence of physical forces on ocean ecosystems.
FRONTIERS IN MARINE SCIENCE
(2023)
Article
Environmental Sciences
Mercedes Pozo Buil, Michael G. Jacox, Jerome Fiechter, Michael A. Alexander, Steven J. Bograd, Enrique N. Curchitser, Christopher A. Edwards, Ryan R. Rykaczewski, Charles A. Stock
Summary: The study downscales three Earth System Models (ESMs) to produce climate projections for the California Current System (CCS) under high emission scenario, finding an intensification of upwelling winds, overall surface warming, nitrate enrichment, and dissolved oxygen decrease. While all models agree on future changes in offshore waters, differences arise in coastal regions, resulting in varied responses of biogeochemical variables. Downscaled models reflect trends in ESMs, but differ more for biogeochemical than physical variables.
FRONTIERS IN MARINE SCIENCE
(2021)
Article
Oceanography
Shailja Gangrade, Peter J. S. Franks
Summary: Locally enhanced productivity and carbon export are observed at oceanic density fronts, and the physical-biological interplay along and across these fronts is often assumed or hypothesized. However, the short residence times of waters in fronts challenge this assumption. This study explores an eddy-associated front in the California Current System, finding distinct origins of phytoplankton patches along the front, related to strong upstream coastal upwelling pulses.
JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
(2023)
Article
Limnology
Zuzanna M. Abdala, Sophie Clayton, Sveinn Einarsson, Kimberly Powell, Claire P. Till, Tyler H. Coale, P. Dreux Chappell
Summary: This study examines the diatom community composition within cyclonic mesoscale eddies in the California Current System, and found distinct differences in diatom communities between eddies and non-eddy waters, with variations in salinity and dissolved iron concentrations. It also highlights the potential significance of certain diatom species in older eddies, which could impact carbon cycling and export in the wider California coastal area.
LIMNOLOGY AND OCEANOGRAPHY
(2022)
Article
Oceanography
Chiranjivi Jayaram, Felix Jose
Summary: Coastal upwelling in the south eastern Arabian Sea during the summer monsoon season is assessed using wind stress and its curl. The study finds that wind stress curl plays a critical role in modulating upwelling along the coast, and the spatio-temporal variability of upwelling is dominated by wind stress curl.
CONTINENTAL SHELF RESEARCH
(2022)
Article
Oceanography
A. Giddings, P. J. S. Franks, S. Baumann-Pickering
Summary: The California Current System (CCS) is a highly productive eastern boundary upwelling system, and cross-shore transport is driven by horizontal stirring from mesoscale features. The study reveals the close relationship between mesoscale stirring and seasonal upwelling in the CCS, as well as the predictability of annual and interannual variations. Furthermore, it confirms the positive correlation between chlorophyll a and horizontal stirring intensity.
JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
(2022)
Article
Automation & Control Systems
Ling Xing, Qiang Wei, Yunwei Li
Summary: This article proposes a new power converter for the CSC-based series-connected wind system and develops three versions of the converter. Compared to existing CSC-based converters, the proposed converter offers practical solutions, superior current harmonic performance, inherent power balancing, simple control, and high scalability, while retaining the advantages of existing CSCs. The operation principle and performance of the proposed converter are discussed and verified through simulation and lab-scaled experiments.
IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS
(2022)
Article
Environmental Sciences
Shan Liu, Juncheng Zuo, Yeqiang Shu, Qiyan Ji, Yunxia Cai, Jinglong Yao
Summary: Using satellite observations and reanalysis data, this study examines the long-term trend of coastal upwelling in the South China Sea (SCS) from 1982 to 2020. The findings show increasing upwelling intensity in three typical regions (eastern Guangdong, eastern Hainan, and eastern Vietnam) of the SCS. The study also investigates the causes of intensified upwelling through wind stress curl and wind stress analysis.
FRONTIERS IN MARINE SCIENCE
(2023)
Article
Environmental Sciences
Andrew R. Thompson, Eric P. Bjorkstedt, Steven J. Bograd, Jennifer L. Fisher, Elliott L. Hazen, Andrew Leising, Jarrod A. Santora, Erin V. Satterthwaite, William J. Sydeman, Michaela Alksne, Toby D. Auth, Simone Baumann-Pickering, Noelle M. Bowlin, Brian J. Burke, Elizabeth A. Daly, Heidi Dewar, John C. Field, Newell T. Garfield, Ashlyn Giddings, Ralf Goericke, John Hildebrand, Cheryl A. Horton, Kym C. Jacobson, Michael G. Jacox, Jaime Jahncke, Michael Johns, Joshua Jones, Raphe M. Kudela, Sharon R. Melin, Cheryl A. Morgan, Catherine F. Nickels, Rachael A. Orben, Jessica M. Porquez, Elan J. Portner, Antonella Preti, Roxanne R. Robertson, Daniel L. Rudnick, Keith M. Sakuma, Isaac D. Schroeder, Owyn E. Snodgrass, Sarah Ann Thompson, Jennifer S. Trickey, Pete Warzybok, William Watson, Edward D. Weber
Summary: A La Nina occurred in the California Current Ecosystem in 2021, with many indicators resembling past La Ninas, but with some differences as well. Further study is needed to understand the effects of La Nina on this ecosystem.
FRONTIERS IN MARINE SCIENCE
(2022)
Article
Geosciences, Multidisciplinary
Giovanni Liguori, Shayne McGregor, Martin Singh, Julie Arblaster, Emanuele Di Lorenzo
Summary: Tropical modes of variability, such as El Nino-Southern Oscillation (ENSO) and the Indian Ocean Dipole (IOD), have a strong influence on the interannual variability of Australian precipitation. However, the commonly used indices of ENSO and IOD display significant co-variability, making it difficult to quantify the independent contribution of each mode to precipitation anomalies. In this study, through modeling experiments, it is found that the ENSO-only-driven precipitation patterns significantly underestimate the impact of ENSO on Australian precipitation when the influence of IOD is statistically removed. A conceptual model is proposed to effectively separate the contribution of each mode to Australian precipitation variability.
GEOPHYSICAL RESEARCH LETTERS
(2022)
Article
Oceanography
Rui Sun, Ana B. Villas Boas, Aneesh C. Subramanian, Bruce D. Cornuelle, Matthew R. Mazloff, Arthur J. Miller, Sabique Langodan, Ibrahim Hoteit
Summary: This study quantifies the effects of ocean currents on the waves generated during tropical cyclones in the Arabian Sea using satellite observations and wave modeling. The research finds that wave refraction induced by ocean currents has significant impacts on wave heights, wavelengths, and directions, extending for thousands of kilometers.
JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
(2022)
Article
Biology
Peter van der Sleen, Pieter A. Zuidema, John Morrongiello, Jia Lin J. Ong, Ryan R. Rykaczewski, William J. Sydeman, Emanuele Di Lorenzo, Bryan A. Black
Summary: This study reveals the connection between marine fish population fluctuations and fishing intensity, demographic processes, and environmental variability. The researchers found that sea surface temperature (SST) plays a significant role in fish somatic growth variability and that life-history characteristics affect population-level responses to environmental variability. The study also shows that increasing fishing pressure reduces predictive skill, and that increases in SST mean and variance can amplify biomass volatility and reduce predictability in the future.
COMMUNICATIONS BIOLOGY
(2022)
Article
Engineering, Civil
Kyungmin Park, Ivan Federico, Emanuele Di Lorenzo, Tal Ezer, Kim M. Cobb, Nadia Pinardi, Giovanni Coppini
Summary: The dynamics controlling storm surges over the South Atlantic Bight (SAB) coastal wetlands and communities are complex and not well understood. A study using a numerical model found that local atmospheric forcing leads to a uniform alongshore water level response, while the position and structure of the maximum storm surge are determined by the timing of remote ocean forcing.
COASTAL ENGINEERING
(2022)
Article
Geosciences, Multidisciplinary
Samuel C. Mogen, Nicole S. Lovenduski, Allysa R. Dallmann, Luke Gregor, Adrienne J. Sutton, Steven J. Bograd, Nathali Cordero Quiros, Emanuele Di Lorenzo, Elliott L. Hazen, Michael G. Jacox, Mercedes Pozo Buil, Stephen Yeager
Summary: This study characterizes the biogeochemical properties of the Eastern North Pacific upper ocean during the Winter of 2013-2014 using observations and models, and finds that the Blob is associated with increased aragonite saturation and decreased oxygen concentration.
GEOPHYSICAL RESEARCH LETTERS
(2022)
Article
Geosciences, Multidisciplinary
A. Capotondi, M. Newman, T. Xu, E. Di Lorenzo
Summary: The intensity and persistence of Northeast Pacific marine heatwaves (MHWs) are influenced by both local atmospheric forcing and large-scale climate influences. Sea surface temperature and sea surface height anomalies play crucial roles in the development of MHWs, with subsurface ocean dynamics being relevant. The growth of Northeast Pacific MHWs is part of a basin-scale dynamical mode that connects the North Pacific with central equatorial Pacific El Nino events, potentially prolonging the duration of MHWs.
GEOPHYSICAL RESEARCH LETTERS
(2022)
Article
Acoustics
Bruce D. Cornuelle, Emmanuel K. Skarsoulis
Summary: This study investigates the use of the time-lagged cross-correlation envelope of an underwater noise field between two hydrophones as a proxy for studying ocean variability. The sensitivity of the envelope peak times to changes in the sound-speed distribution is examined. Finite-frequency calculations and sensitivity kernels are used to infer ocean structure from cross-correlation peaks. The study considers different propagation conditions and noise-source distributions, addressing deviations from linearity.
JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA
(2022)
Article
Oceanography
Martha C. Schonau, Daniel L. Rudnick, Ganesh Gopalakrishnan, Bruce D. Cornuelle, Bo Qiu
Summary: Interannual volume transport anomalies were calculated in the far western tropical North Pacific using WPOSE data. The anomalies were found to be related to El Niño-Southern Oscillation phenomena. The upper and lower layer transport anomalies were not always in phase and made considerable contributions to total transport variability.
JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
(2022)
Editorial Material
Environmental Sciences
Brett W. W. Molony, Alex T. T. Ford, Ana M. M. Sequeira, Angel Borja, Anna Milena Zivian, Carol Robinson, Christian Lonborg, Elva G. G. Escobar-Briones, Emanuele Di Lorenzo, Jesper H. H. Andersen, Marius N. N. Mueller, Michelle J. J. Devlin, Pierre Failler, Sebastian Villasante, Simone Libralato, Tomaso Fortibuoni
FRONTIERS IN MARINE SCIENCE
(2022)
Article
Multidisciplinary Sciences
Ruiqiang Ding, Yu-Heng Tseng, Emanuele Di Lorenzo, Liang Shi, Jianping Li, Jin-Yi Yu, Chunzai Wang, Cheng Sun, Jing-Jia Luo, Kyung-Ja Ha, Zeng-Zhen Hu, Feifei Li
Summary: The authors find that persistent two-way teleconnections between the North Pacific Oscillation and the tropical Pacific are a key source of multi-year El Nino events. These teleconnections lead to the prolonged El Nino phenomena, resulting in severe floods and droughts worldwide with significant socioeconomic impacts. Model experiments and future projections suggest that with enhanced NPO variability under future anthropogenic forcing, more frequent multi-year El Nino events should be expected. Therefore, properly accounting for the effects of the NPO on the evolution of El Nino events may improve multi-year El Nino prediction and projection.
NATURE COMMUNICATIONS
(2022)
Article
Oceanography
Laura E. Lilly, Bruce D. Cornuelle, Mark D. Ohman
Summary: This study proposes a framework to examine the advection-driven spring biomass fluctuations of six euphausiid species in the southern California Current System. The results show different response patterns to water flows among species, and advection accounts for a varying proportion of species fluctuations.
DEEP-SEA RESEARCH PART I-OCEANOGRAPHIC RESEARCH PAPERS
(2022)
Article
Acoustics
Peter N. N. Mikhalevsky, Ganesh Gopalakrishnan, Bruce D. D. Cornuelle
Summary: An algorithm is described that provides underwater geo-positioning using acoustic sources, and the accuracy of the positioning is improved through model processing. The algorithm reduces the geo-position error from 58 to 25 m and the accuracy is controlled by the accuracy of the ocean circulation model.
JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA
(2023)
Article
Oceanography
K. Ramos-Musalem, S. T. Gille, B. D. Cornuelle, M. R. Mazloff
Summary: The study investigates the influence of Sebastian Vizcaino Bay (SVB) on sea surface height (SSH) variability in the Southern California Bight (SCB) by using a simplified ocean computer model. The results show that wind events over SVB can enhance variability throughout the region, with waves propagating away from the bay. This suggests that SVB is a continuous source of gravity waves, internal waves, and coastal trapped waves (CTWs) to the SCB.
JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
(2023)
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
Ariane Verdy, Matthew R. Mazloff, Bruce D. Cornuelle, Aneesh C. Subramanian
Summary: A state estimate of the tropical Pacific Ocean is analyzed to understand the volume, temperature, and salinity budgets during 2014-2018. The state estimate is consistent with observed variability and budgets are analyzed to understand the processes responsible for variability in box-mean properties. The onset and recovery of the 2015/2016 El Nino event is dominated by anomalous surface fluxes and horizontal advection.
JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
(2023)