Article
Oceanography
Dorleta Orue-Echevarria, Kurt L. Polzin, Alberto Naveira C. Garabato, Alexander Forryan, Josep L. Pelegri
Summary: This study evaluates the rates of isopycnal stirring, water mass transport, and diapycnal mixing across the Brazil-Malvinas Confluence (BMC) using microstructure and hydrographic measurements. The results show widespread isopycnal stirring and weak diapycnal mixing in the BMC, with isopycnal stirring prevailing in deeper layers. Eddies are found to have an important cross-BMC transport, suggesting that eddy-induced flows significantly contribute to the transfer of waters in the region.
JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
(2023)
Article
Environmental Sciences
Ronald Souza, Luciano Pezzi, Sebastiaan Swart, Fabricio Oliveira, Marcelo Santini
Summary: The study investigates the impact of warm and cold core eddies on air-sea interaction variables in the Brazil-Malvinas Confluence (BMC), showing a significant influence on sensible and latent heat fluxes in the atmosphere. The findings highlight differences in local meteorological variables depending on sea surface temperature within eddy cores and demonstrate biases in estimating heat fluxes between atmospheric reanalysis products and eddy covariance measurements. The importance of short-term changes in both the atmosphere and the ocean in contributing to these biases is emphasized, underlining the impact of mesoscale oceanographic structures on local air-sea heat fluxes and marine atmospheric boundary layer stability in the BMC.
Article
Environmental Sciences
Dongseon Kim, Seon-Eun Lee, Sosul Cho, Dong-Jin Kang, Geun-Ha Park, Sok Kuh Kang
Summary: The distribution of surface fCO(2) in the northern Philippine Sea, where mesoscale eddies are common, was investigated to determine the effects of these eddies on sea-air CO2 flux. The study found that surface fCO(2) showed large spatial variations and was influenced by temperature and upwelling processes. Sea-air CO2 flux varied significantly between the different eddy types.
FRONTIERS IN MARINE SCIENCE
(2022)
Review
Oceanography
Elena Roget, Josep L. Pelegri, Jesus Planella-Morato, Joan Puigdefabregas, Mikhail Emelianov, Ignasi Valles-Casanova, Dorleta Orue-Echevarria
Summary: Diapycnal mixing in the Brazil-Malvinas Confluence Zone (BMC) was assessed based on microstructure measurements during an April 2017 cruise. Active turbulence was observed at all depths and stations, with high-dissipation patches ranging from several metres to a few tens of metres. The frontal zone showed high energy dissipation and eddy diffusivity, with higher values in the south compared to the north of the BMC.
PROGRESS IN OCEANOGRAPHY
(2023)
Article
Oceanography
Dorleta Orue-Echevarria, Josep L. Pelegri, Ivan J. Alonso-Gonzalez, Veronica M. Benitez-Barrios, Mikhail Emelianov, Antonio Garcia-Olivares, Marc Gasser Rubinat, Patricia De la Fuente, Carmen Herrero, Jordi Isern-Fontanet, Marta Masdeu-Navarro, Jesus Pena-Izquierdo, Alberto R. Piola, Sergio Ramirez-Garrido, Miquel Rosell-Fieschi, Joaquin Salvador, Martin Saraceno, Daniel Valla, Ignasi Valles-Casanova, Montserrat Vidal
Summary: This study provides a comprehensive description of the Brazil-Malvinas Confluence (BMC) using physical and biogeochemical data collected in March 2015. The study characterizes the impinging and outflowing currents, as well as the thermohaline structure, and compares in-situ measurements with climatological data and Mercator Ocean reanalysis. The results highlight the contrasting properties of the Brazil Current and Malvinas Current, and the presence of thermohaline intrusions and brackish waters in the frontal system.
DEEP-SEA RESEARCH PART I-OCEANOGRAPHIC RESEARCH PAPERS
(2021)
Article
Environmental Sciences
Xiangzhou Song, Xuehan Xie, Bo Qiu, Haijin Cao, Shang-Ping Xie, Zhiqiang Chen, Weidong Yu
Summary: This study investigates the latent heat flux (LH) anomalies associated with submesoscale processes in a cyclonic eddy using recent satellite-ship-coordinated air-sea observations. Unbalanced submesoscale features are identified as submesoscale SST fronts. The results show that these submesoscale fronts induce larger LH anomalies than mesoscale eddies and have a higher spatial gradient.
FRONTIERS IN MARINE SCIENCE
(2022)
Article
Geosciences, Multidisciplinary
Thomas Extier, Katharina D. Six, Bo Liu, Hanna Paulsen, Tatiana Ilyina
Summary: The exchange of carbon between the ocean and the atmosphere is an important process that affects past climates. This study implemented the flux of terrestrial organic matter into the ocean and investigated its impact on the biogeochemistry during the last deglaciation. The results indicate that the input of terrestrial organic matter during a specific time period led to oceanic outgassing.
CLIMATE OF THE PAST
(2022)
Article
Oceanography
D. I. Frey, A. A. Kubryakov
Summary: The goal of this study is to analyze the velocity structure and distribution of eddies in the Brazil-Malvinas Confluence zone using direct and satellite measurements. The results show that these eddies have high velocities and intense temperature and salinity anomalies, which significantly affect the salt and heat content in the region.
JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
(2023)
Article
Meteorology & Atmospheric Sciences
Sebastien Blein, Romain Roehrig, Aurore Voldoire
Summary: This study proposes a parametrization method for mesoscale wind-speed variability and validates it using a large dataset. The results show that the proposed parametrization method can better capture the mesoscale enhancement of surface turbulent fluxes.
QUARTERLY JOURNAL OF THE ROYAL METEOROLOGICAL SOCIETY
(2022)
Article
Oceanography
Neill Mackay, Andrew Watson
Summary: In the Southern Ocean south of the Polar Front, utilizing summertime observations to reconstruct wintertime pCO2surf greatly improved coverage and enhanced accuracy of flux estimates. The addition of pseudo observations initially increased outgassing, which gradually decreased over time.
JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
(2021)
Article
Plant Sciences
Rafael Henrique de Moura Falcao, Pedro Augusto Mendes de Castro Melo, Moacyr Cunha de Araujo Filho, Maria da Gloria Goncalves da Silva Cunha
Summary: The Brazil-Malvinas Confluence (BMC) is a hotspot of phytoplankton biodiversity with high environmental variability. This study investigated the composition and characteristics of phytoplankton in the BMC and a Cold Core Eddy (CCE). The results showed that autotrophic organisms and marine planktonic species were predominant in the BMC and CCE, while heterotrophic dinoflagellates were dominant in the Brazil Current and CCE. The study also revealed a high diversity of species in the region, with an increase in species richness promoted by the temperature conditions in the CCE.
Article
Geosciences, Multidisciplinary
Zheliang Zhang, Yunxia Zheng, Hao Li
Summary: This study investigates the impact of tropical cyclones (TCs) on the three-dimensional characteristics of mesoscale oceanic eddies through statistical analysis of satellite-based eddy information and Argo data. It found that there is a heat pump effect in the changes of eddy structure similar to that in tropical cyclones. The abnormal signals in the upper layer of the cyclonic eddy (anticyclonic eddy) under the forcing of TC are transmitted to the middle and lower layers of the eddy and form retention, making the eddy structure not recover to the original state in a short period of time. The change of barrier layer in the eddy is also explored, and it was found that the barrier layer thickness in both cyclonic eddy and anticyclonic eddy has increased.
FRONTIERS IN EARTH SCIENCE
(2023)
Article
Environmental Sciences
J. Prytherch, M. J. Yelland
Summary: This study directly determined the CO2 gas transfer velocity in the central Arctic Ocean during the summer-autumn transition using eddy covariance flux measurements, finding a quadratic dependence on wind speed and a 30% lower value than commonly used open-ocean parameterizations. Additionally, gas transfer velocities were found to be influenced by the dimension of the lead, suggesting that incorporating lead width data may be necessary for regional gas exchange estimates.
GLOBAL BIOGEOCHEMICAL CYCLES
(2021)
Article
Environmental Sciences
Wei Cui, Jungang Yang, Yongjun Jia, Jie Zhang
Summary: Vigorous mesoscale eddies, identified from sea surface height and sea surface temperature, are widely distributed in the Kuroshio Extension. The correlation between sea surface temperature anomaly (SSTA) and sea surface height anomaly (SSHA) inside eddies is higher in winter than in summer. The lifetime and propagation distance of SSTA-based eddies are shorter and smaller than those of SSHA-based eddies. SSHA-based eddies are primarily found in the Kuroshio mainstream, while SSTA-based eddies are concentrated in the Oyashio Extension, where SST gradient is large and changes in SST fields caused by eddies are more obvious.
Article
Meteorology & Atmospheric Sciences
Leonie Esters, Anna Rutgersson, Erik Nilsson, Erik Sahlee
Summary: A study found that non-local processes in lakes contribute to errors in eddy-covariance flux estimations, depending on wind speed and direction. A correction approach was proposed to correct the flux errors caused by non-local processes and resulted in gas transfer velocities close to commonly used wind-speed based parametrizations.
BOUNDARY-LAYER METEOROLOGY
(2021)
Article
Meteorology & Atmospheric Sciences
Luciano P. Pezzi, Mario F. L. Quadro, Joao A. Lorenzzetti, Arthur J. Miller, Eliana B. Rosa, Leonardo N. Lima, Ueslei A. Sutil
Summary: The South Atlantic Convergence Zone (SACZ) is an atmospheric system in South America characterized by a persistent cloud band which causes sea surface cooling. Investigations into SACZ episodes in the Southwestern Atlantic Ocean show a cooling effect on the ocean surface due to dynamic and thermodynamic mechanisms. The presence of an atmospheric cyclonic vortex southwest of the SACZ influences ocean dynamics and may have implications for various scientific and climate research areas.
Article
Fisheries
M. F. Cronin, S. Swart, C. A. Marandino, C. Anderson, P. Browne, S. Chen, W. R. Joubert, U. Schuster, R. Venkatesan, C. Addey, O. Alves, F. Ardhuin, S. Battle, M. A. Bourassa, Z. Chen, M. Chory, C. Clayson, R. B. de Souza, M. du Plessis, M. Edmondson, J. B. Edson, S. T. Gille, J. Hermes, V Hormann, S. A. Josey, M. Kurz, T. Lee, F. Maicu, E. H. Moustahfid, S-A Nicholson, E. S. Nyadjro, J. Palter, R. G. Patterson, S. G. Penny, L. P. Pezzi, N. Pinardi, J. E. J. Reeves Eyre, N. Rome, A. C. Subramanian, C. Stienbarger, T. Steinhoff, A. J. Sutton, H. Tomita, S. M. Wills, C. Wilson, L. Yu
Summary: The Observing Air-Sea Interactions Strategy (OASIS) is a program that aims to improve Earth system forecasts, CO2 uptake assessments, and provide ocean information for decision makers. It focuses on creating a global network of mobile air-sea observing platforms, a satellite network optimized for measuring air-sea fluxes, and improving the representation of air-sea coupling in Earth system models. The program consists of various activities such as network design, model improvement, partnership building, and best practices experiments.
ICES JOURNAL OF MARINE SCIENCE
(2023)
Article
Environmental Sciences
Ronald B. Souza, Margareth S. Copertino, Gilberto Fisch, Marcelo F. Santini, Walter H. D. Pinaya, Fabiane M. Furlan, Rita de Cassia M. Alves, Osmar O. Moller, Luciano P. Pezzi
Summary: This study measured the atmospheric CO2 concentrations in a salt marsh in southern Brazil and analyzed the CO2 exchange fluxes between vegetation and the atmosphere using eddy correlation techniques. The results showed that the CO2 fluxes were modulated by transient atmospheric systems and surrounding water level variations. It was found that the salt marsh acted as a CO2 sink during daytime and a CO2 source during nighttime. The seasonal changes in CO2 fluxes were influenced by sunlight, temperature, marsh inundation, winds, and plant biomass.
FRONTIERS IN MARINE SCIENCE
(2022)
Article
Meteorology & Atmospheric Sciences
Fernanda Casagrande, Leticia Stachelski, Ronald Buss de Souza
Summary: This paper evaluates the ability of 11 climate models to simulate the seasonal cycle of Antarctic sea ice. The results show that all models can accurately capture the seasonal variation, although there are significant biases in certain sea areas compared to observations. The latest model version (CMIP6) exhibits some improvements over the previous version (CMIP5). All models predict significant sea ice loss in the future due to CO2 forcing. Despite advancements, the models still struggle to accurately represent regional sea ice changes.
INTERNATIONAL JOURNAL OF CLIMATOLOGY
(2023)
Article
Multidisciplinary Sciences
Luciano P. Pezzi, Mario F. L. Quadro, Everaldo B. Souza, Arthur J. Miller, Vadlamudi B. Rao, Eliana B. Rosa, Marcelo F. Santini, Andreia Bender, Ronald B. Souza, Mylene J. Cabrera, Claudia K. Parise, Jonas T. Carvalho, Luciana S. Lima, Maria Rita L. de Quadros, Douglas M. Nehme, Jaime F. Antonio
Summary: The oceanic South Atlantic Convergence Zone (SACZ) was responsible for more than 90% of the precipitation in Southeast Brazil and the Southwestern Atlantic Ocean (SWA) during South America's 2021/2022 summer. This summer was characterized by an unusually high number of SACZ episodes, all of which were oceanic SACZ with characteristics of an Atmospheric River, resulting in excessive precipitation. The interaction between the surface layer of the SWA and the atmosphere played a significant role in amplifying the observed impacts, such as landslides and floods.
SCIENTIFIC REPORTS
(2023)
Editorial Material
Environmental Sciences
Ronald Buss Souza, Leticia Cotrim da Cunha, Fabrice Hernandez, Regina Rodrigues Rodrigues
FRONTIERS IN MARINE SCIENCE
(2023)
Article
Meteorology & Atmospheric Sciences
Mylene Jaen Cabrera, Luciano Ponzi Pezzi, Marcelo Freitas Santini, Ueslei Adriano Sutil, Jose Antonio Aravequia, Ricardo de Camargo
Summary: Vertical mixing and hydrostatic adjustment are the two main mechanisms explaining the stability of the marine atmospheric boundary layer in regions with intense horizontal temperature gradients. This study utilized a coupled ocean-atmosphere numerical model to simulate the southwestern Atlantic Ocean region, and found that vertical mixing and warm-air temperature advection modulated the stability of the boundary layer. The results contribute to the understanding of air-sea interactions and the physical mechanisms controlling stability.
QUARTERLY JOURNAL OF THE ROYAL METEOROLOGICAL SOCIETY
(2023)
Article
Meteorology & Atmospheric Sciences
Kyle R. Clem, Marilyn N. Raphael
BULLETIN OF THE AMERICAN METEOROLOGICAL SOCIETY
(2023)
Article
Multidisciplinary Sciences
Celina Candida F. Rodrigues, Marcelo F. Santini, Luciana S. Lima, Ueslei Adriano Sutil, Jonas T. Carvalho, Mylene J. Cabrera, Eliana B. Rosa, Jacob W. Burns, Luciano P. Pezzi
Summary: The oceans, particularly the Southern Ocean, are vital in mitigating climate change. This study investigates the behavior of turbulent CO2 fluxes in the Drake Passage and Bransfield Strait regions and reveals the significant influence of atmospheric and oceanic conditions on carbon absorption.
ANAIS DA ACADEMIA BRASILEIRA DE CIENCIAS
(2023)
Article
Multidisciplinary Sciences
Michelly G. S. Queiroz, Claudia K. Parise, Luciano P. Pezzi, Camila B. Carpenedo, Fernanda C. Vasconcellos, Ana Laura R. Torres, Wesley L. Barbosa, Leonardo G. Lima
Summary: This study evaluates the response of South Atlantic tropospheric circulation to increased Antarctic sea ice and finds that it leads to temperature cooling, strengthening and northward shift of the polar jet, southward shift of the subtropical jet, and a shift from positive to negative phase of the Southern Annular Mode.
ANAIS DA ACADEMIA BRASILEIRA DE CIENCIAS
(2022)