Article
Oceanography
Yanxu Chen, Sabrina Speich, Remi Laxenaire
Summary: We present a detecting algorithm to identify ocean surface mixed layer depth (MLD) and mode water from Argo profiling data. This algorithm calculates the first and second derivatives of temperature (or density) profiles to detect gradients and their sharp changes. The algorithm is applied to detect South Atlantic Subtropical Mode Water (SASTMW) and provides new insights into the origins and dynamics of these water masses. The study also investigates the role of mesoscale eddies in the formation and transport of SASTMW using satellite altimetry maps. The combination of the detecting algorithm and eddy detection methods highlights the importance of clockwise eddies in the SASTMW formation.
JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
(2022)
Article
Geosciences, Multidisciplinary
L. T. Gulliver, T. Radko
Summary: This study proposes a plausible explanation for the longevity of large-scale ocean rings based on bottom roughness. The results show that topography stabilizes coherent vortices and dramatically prolongs their lifespan.
GEOPHYSICAL RESEARCH LETTERS
(2022)
Article
Meteorology & Atmospheric Sciences
Teresa Losada, Belen Rodriguez-Fonseca, C. Roberto Mechoso, Elsa Mohino, Antonio Castano-Tierno
Summary: This paper investigates the dependence of interannual tropical Atlantic-Pacific basin interactions on convection-related features and their climatology. Through experimental simulations, the results show that changes in tropical convection patterns have significant impacts on the interactions between tropical basins.
JOURNAL OF CLIMATE
(2022)
Article
Meteorology & Atmospheric Sciences
Zhaoxiangrui He, Aiguo Dai, Mathias Vuille
Summary: The South American climate is influenced by both Atlantic Multidecadal Variability (AMV) and Pacific Multidecadal Variability (PMV), with complex correlations observed between precipitation and temperature changes. The perturbations in local circulations play a key role in driving these anomalies, with varying patterns observed in different seasons and regions.
JOURNAL OF CLIMATE
(2021)
Article
Oceanography
Yeqiang Shu, Jinghong Wang, Huijie Xue, Rui Xin Huang, Ju Chen, Dongxiao Wang, Qiang Wang, Qiang Xie, Weiqiang Wang
Summary: Strong subinertial variability near a seamount in the South China Sea was revealed by mooring observations. The study found that topographic Rossby waves (TRWs) and deep eddies were the main factors causing this variability, explaining a significant portion of the kinetic energy of the deep subinertial currents. The generation of TRWs was induced by mesoscale perturbations in the upper layer, while the interaction between cyclonic-anticyclonic eddy pairs and the seamount topography contributed to the generation of deep eddies.
JOURNAL OF PHYSICAL OCEANOGRAPHY
(2022)
Article
Oceanography
Issufo Halo, Roshin P. Raj, Anton Korosov, Pierrick Penven, Johnny A. Johannessen, Mathieu Rouault
Summary: The equatorward decrease of mesoscale eddy abundance and the meridional variations of their mean properties in the tropical South-East Atlantic Ocean were investigated using geostrophic flows and two-dimensional geostrophic turbulence theories. Satellite-derived altimetric eddy kinetic energy density spectra were assessed in different latitude bands, revealing minimum energy spectra in the northern Angola Basin and the Angola Benguela Front. The analysis suggests a shift from nonlinear eddies to linear Rossby waves in the region, which could explain the lower abundance of eddies compared to other regions in the world oceans.
JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
(2023)
Article
Oceanography
Hua Zheng, Xiao-Hua Zhu, Juntian Chen, Min Wang, Ruixiang Zhao, Chuanzheng Zhang, Ze-Nan Zhu, Qiang Ren, Yansong Liu, Feng Nan, Fei Yu
Summary: This study analyzes the generation and propagation characteristics of Topographic Rossby waves (TRWs) in the northern Manila Trench (MT) in the South China Sea (SCS) based on observational data. The study finds that TRWs are mainly generated by perturbations caused by the intrusion of the Kuroshio in winter and perturbations generated north of Luzon Island in summer. The study also reveals that variations in the Kuroshio path and related eddies induce TRWs associated with intraseasonal variations in the deep SCS, but the distribution of TRWs is complex due to wave propagation, with some TRWs unrelated to local perturbations but propagating from adjacent regions.
JOURNAL OF PHYSICAL OCEANOGRAPHY
(2022)
Article
Meteorology & Atmospheric Sciences
V. Kitsios, J. S. Frederiksen, T. J. O'Kane
Summary: Ocean circulation dynamics is a complex system with various interactions between different scales and components, which can be effectively represented and simulated using numerical models. The accuracy of these simulations depends on proper parameterizations, especially for the subgrid interactions. In this study, parameterizations for different classes of subgrid interactions are developed and validated in idealized Antarctic Circumpolar Current flows.
JOURNAL OF ADVANCES IN MODELING EARTH SYSTEMS
(2023)
Article
Meteorology & Atmospheric Sciences
Marta Martin-Rey, Ignasi Valles-Casanova, Josep L. Pelegria
Summary: The study investigates the impact of tropical Atlantic Ocean variability modes on the variability of the upper-ocean circulation. Multiple datasets including oceanic reanalyses, simulations, and satellite data were utilized for the period 1982-2018. The results reveal significant changes in the surface and subsurface ocean currents during the emergence of Atlantic meridional mode (AMM), Atlantic zonal mode (AZM), and the connection between AMM and AZM. Ocean waves play a crucial role in connecting tropical and equatorial ocean transport.
JOURNAL OF CLIMATE
(2023)
Article
Meteorology & Atmospheric Sciences
Hermann N. Nana, Romeo S. Tanessong, Lucie A. Djiotang Tchotchou, Alain T. Tamoffo, Foupouapegnigni Moihamette, Derbetini A. Vondou
Summary: This study examines the interlinkages between the South Atlantic Ocean Dipole (SAOD) and Central Africa (CA) rainfall variability. The results show that during positive SAOD events, positive/negative rainfall anomalies feature zone I/zone II more pronounced in reanalysis data. The relationship between CA rainfall variability and SAOD strengthens when the signal of El Nino-Southern Oscillation (ENSO) is removed.
Article
Environmental Sciences
Wen Xu, Yeqiang Shu, Dongxiao Wang, Ju Chen, Jinghong Wang, Qiang Xie, Qiang Wang, Danian Liu, Tingting Zu, Yunkai He
Summary: This study reveals the strong intraseasonal variability (ISV) features of the upper-layer current in the northern South China Sea (NSCS) based on four long-time mooring observations and altimeter data. The ISV consists of two dominant periods of 10-65 days and 65-110 days, with spatial differences primarily due to baroclinic and barotropic instabilities. The spatial distribution of upper-layer ISV is closely associated with the mesoscale eddy radius of the NSCS, with the strength of ISV inversely proportional to the eddy radius of 10-65-day ISV and directly proportional to the eddy radius of 65-110-day ISV.
FRONTIERS IN MARINE SCIENCE
(2021)
Article
Oceanography
C. D. Luko, I. C. A. da Silveira, I. T. Simoes-Sousa, J. M. Araujo, A. Tandon
Summary: The southern branch of the South Equatorial Current is the northern limit of the South Atlantic Subtropical Gyre, bifurcating into the Brazil Current and North Brazil Undercurrent when it reaches Brazil. This study shows that the South Equatorial Current arrives at the South Atlantic western boundary as a multi-banded flow with different subsurface cores, influencing the seasonality of the Brazil Current and mesoscale eddies off Brazil.
JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
(2021)
Article
Meteorology & Atmospheric Sciences
Hyo-Jeong Kim, Soon-Il An, Soong-Ki Kim, Jae-Heung Park
Summary: This study aims to improve the understanding of transient thermohaline circulation responses under rapidly varying forcing and their dependence on forcing time scales. The results suggest that the Atlantic meridional overturning circulation collapse and recovery occur at higher and lower freshwater forcing values, respectively, when the forcing time scale is shorter.
JOURNAL OF CLIMATE
(2021)
Article
Environmental Sciences
Lejiang Yu, Shiyuan Zhong, Timo Vihma, Cuijuan Sui, Bo Sun
Summary: We used global atmospheric reanalysis ERA5 and reconstructed sea surface temperature (SST) data to investigate the relationship between the Subtropical Indian Ocean Dipole (SIOD) and South Atlantic Ocean Dipole (SAOD) indices. We found a significant positive correlation between the two indices before 2000, but the correlation weakened afterwards. The results suggest that convective activities and atmospheric wavetrains play a role in the correlation between SST oscillations in the southern Indian Ocean and the Atlantic Ocean.
ATMOSPHERIC CHEMISTRY AND PHYSICS
(2023)
Article
Oceanography
Qi Quan, Zhongya Cai, Guangzhen Jin, Zhiqiang Liu
Summary: Topographic Rossby waves in the abyssal South China Sea have been investigated through observations and numerical simulations. These energetic waves can explain a significant portion of kinetic energy variability in the deep sea, displaying a columnar structure. Wave properties vary depending on environmental parameters, with higher frequency TRWs exhibiting a stronger climbing effect compared to low frequency ones.
JOURNAL OF PHYSICAL OCEANOGRAPHY
(2021)
Article
Geochemistry & Geophysics
Sandrine Bony, Bjorn Stevens, Felix Ament, Sebastien Bigorre, Patrick Chazette, Susanne Crewell, Julien Delanoe, Kerry Emanuel, David Farrell, Cyrille Flamant, Silke Gross, Lutz Hirsch, Johannes Karstensen, Bernhard Mayer, Louise Nuijens, James H. Ruppert, Irina Sandu, Pier Siebesma, Sabrina Speich, Frederic Szczap, Julien Totems, Raphaela Vogel, Manfred Wendisch, Martin Wirth
SURVEYS IN GEOPHYSICS
(2017)
Article
Oceanography
Xujing Jia Davis, Robert A. Weller, Sebastien Bigorre, Albert J. Plueddemann
DEEP-SEA RESEARCH PART II-TOPICAL STUDIES IN OCEANOGRAPHY
(2013)
Article
Engineering, Ocean
Robert A. Weller, Sebastien P. Bigorre, Jeffrey Lord, Jonathan D. Ware, James B. Edson
JOURNAL OF ATMOSPHERIC AND OCEANIC TECHNOLOGY
(2012)
Article
Engineering, Ocean
Sebastien P. Bigorre, Robert A. Weller, James B. Edson, Jonathan D. Ware
JOURNAL OF ATMOSPHERIC AND OCEANIC TECHNOLOGY
(2013)
Article
Oceanography
James B. Edson, Venkata Jampana, Robert A. Weller, Sebastien P. Bigorre, Albert J. Plueddemann, Christopher W. Fairall, Scott D. Miller, Larry Mahrt, Dean Vickers, Hans Hersbach
JOURNAL OF PHYSICAL OCEANOGRAPHY
(2013)
Article
Multidisciplinary Sciences
Jerome Kasparian, Christel Hassler, Bas Ibelings, Nicolas Berti, Sebastien Bigorre, Violeta Djambazova, Elena Gascon-Diez, Gregory Giuliani, Raphael Houlmann, Denis Kiselev, Pierric de Laborie, Anh-Dao Le, Thibaud Magouroux, Tristan Neri, Daniel Palomino, Stefanie Pfandler, Nicolas Ray, Gustavo Sousa, Davide Staedler, Federico Tettamanti, Jean-Pierre Wolf, Martin Beniston
SCIENTIFIC REPORTS
(2017)
Article
Oceanography
Lothar Stramma, Robert A. Weller, Rena Czeschel, Sebastien Bigorre
JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
(2014)
Article
Engineering, Ocean
Michael Schlundt, J. Thomas Farrar, Sebastien P. Bigorre, Albert J. Plueddemann, Robert A. Weller
JOURNAL OF ATMOSPHERIC AND OCEANIC TECHNOLOGY
(2020)
Article
Environmental Sciences
Sebastien P. Bigorre, Albert J. Plueddemann
Summary: This article analyzes 11 years of near-surface meteorology using observations from an open-ocean surface mooring in the Northwestern Tropical Atlantic. It compares in situ data with three reanalyses and finds discrepancies in longwave and shortwave radiation fluxes, with some reanalyses showing significant bias.
FRONTIERS IN MARINE SCIENCE
(2021)
Article
Geosciences, Multidisciplinary
Patricia K. Quinn, Elizabeth J. Thompson, Derek J. Coffman, Sunil Baidar, Ludovic Bariteau, Timothy S. Bates, Sebastien Bigorre, Alan Brewer, Gijs de Boer, Simon P. de Szoeke, Kyla Drushka, Gregory R. Foltz, Janet Intrieri, Suneil Iyer, Chris W. Fairall, Cassandra J. Gaston, Friedhelm Jansen, James E. Johnson, Ovid O. Krueger, Richard D. Marchbanks, Kenneth P. Moran, David Noone, Sergio Pezoa, Robert Pincus, Albert J. Plueddemann, Mira L. Poehlker, Ulrich Poeschl, Estefania Quinones Melendez, Haley M. Royer, Malgorzata Szczodrak, Jim Thomson, Lucia M. Upchurch, Chidong Zhang, Dongxiao Zhang, Paquita Zuidema
Summary: The ATOMIC campaign conducted research on ocean-atmosphere interaction in the tropical North Atlantic, focusing on shallow atmospheric convection, the effects of aerosols and clouds on the ocean surface energy budget, and mesoscale oceanic processes. Multiple platforms including research ships, aircraft, and drones were used for the study.
EARTH SYSTEM SCIENCE DATA
(2021)
Review
Meteorology & Atmospheric Sciences
Wei Zhang, Yu Sun, Yapeng Wu, Junyu Dong, Xiaojiang Song, Zhiyi Gao, Renbo Pang, Boyu Guoan
Summary: This study employed a spatiotemporal deep-learning method to correct biases in numerical ocean wave forecasts. By using a correction model driven by both wave and wind fields and a novel pixel-switch loss function, the corrected results performed well in different seasons and improved the accuracy of the original forecasts.
