On eddy polarity distribution in the southwestern Atlantic

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Eddies in the southwestern Atlantic were detected from more than 18 years of satellite altimetry data using a modified version of the Okubo-Weiss method. The spatial distribution and polarity of eddies were examined. A larger concentration of cyclonic (anticyclonic) eddies was found on the left (rig...

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Autor principal: Saraceno, Martin
Publicado: 2012
Materias:
Eddies
Southwestern Atlantic
Zapiola Drift
Antarctic Circumpolar Currents
Anticyclonic circulation
Anticyclonic eddies
Bottom topography
Chlorophyll a
Chlorophyll-a concentration
Cyclonic eddy
Potential vorticity
Satellite altimetry data
South Atlantic
Ocean currents
Chlorophyll
anticyclone
bottom topography
chlorophyll a
circumpolar current
concentration (composition)
eddy
potential vorticity
satellite altimetry
spatial distribution
Atlantic Ocean
Atlantic Ocean (Southwest)
Zapiola Rise
Acceso en línea:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_09670637_v69_n_p62_Saraceno
http://hdl.handle.net/20.500.12110/paper_09670637_v69_n_p62_Saraceno
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id paper:paper_09670637_v69_n_p62_Saraceno
record_format dspace
spelling paper:paper_09670637_v69_n_p62_Saraceno2023-06-08T15:58:43Z On eddy polarity distribution in the southwestern Atlantic Saraceno, Martin Eddies Southwestern Atlantic Zapiola Drift Antarctic Circumpolar Currents Anticyclonic circulation Anticyclonic eddies Bottom topography Chlorophyll a Chlorophyll-a concentration Cyclonic eddy Eddies Potential vorticity Satellite altimetry data South Atlantic Southwestern Atlantic Zapiola Drift Ocean currents Chlorophyll anticyclone bottom topography chlorophyll a circumpolar current concentration (composition) eddy potential vorticity satellite altimetry spatial distribution Atlantic Ocean Atlantic Ocean (Southwest) Zapiola Rise Eddies in the southwestern Atlantic were detected from more than 18 years of satellite altimetry data using a modified version of the Okubo-Weiss method. The spatial distribution and polarity of eddies were examined. A larger concentration of cyclonic (anticyclonic) eddies was found on the left (right) side when looking downstream on some of the largest current systems in the region, such as the South Atlantic Current, the anticyclonic circulation associated with the Zapiola Drift (ZD) and the northern branch of the Antarctic Circumpolar Current. In the region isolated by the anticyclonic Zapiola Current, 91% of eddies were cyclonic. The observed distribution of eddies is in agreement with the generation of eddies from meanders of the above-mentioned currents: cyclonic (anticyclonic) eddies might detach from a meander of the current on the left (right) side when looking downstream on the current. Furthermore, in the ZD area, the bottom topography plays a key role in determining the trajectory of eddies: the anticyclonic current associated with the ZD meanders and eventually generates a cyclonic eddy that enters the ZD region only across the northeastern border, where the gradient of potential vorticity is lower. Finally, average surface chlorophyll-a concentration inside cyclonic and anticyclonic eddies shows that the former have higher chlorophyll-a values. Thus, on average, the classical eddy-pumping theory explains the difference in chlorophyll-a concentration within eddies in the southwestern Atlantic. © 2012 Elsevier Ltd. Fil:Saraceno, M. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 2012 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_09670637_v69_n_p62_Saraceno http://hdl.handle.net/20.500.12110/paper_09670637_v69_n_p62_Saraceno
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Eddies
Southwestern Atlantic
Zapiola Drift
Antarctic Circumpolar Currents
Anticyclonic circulation
Anticyclonic eddies
Bottom topography
Chlorophyll a
Chlorophyll-a concentration
Cyclonic eddy
Eddies
Potential vorticity
Satellite altimetry data
South Atlantic
Southwestern Atlantic
Zapiola Drift
Ocean currents
Chlorophyll
anticyclone
bottom topography
chlorophyll a
circumpolar current
concentration (composition)
eddy
potential vorticity
satellite altimetry
spatial distribution
Atlantic Ocean
Atlantic Ocean (Southwest)
Zapiola Rise
spellingShingle Eddies
Southwestern Atlantic
Zapiola Drift
Antarctic Circumpolar Currents
Anticyclonic circulation
Anticyclonic eddies
Bottom topography
Chlorophyll a
Chlorophyll-a concentration
Cyclonic eddy
Eddies
Potential vorticity
Satellite altimetry data
South Atlantic
Southwestern Atlantic
Zapiola Drift
Ocean currents
Chlorophyll
anticyclone
bottom topography
chlorophyll a
circumpolar current
concentration (composition)
eddy
potential vorticity
satellite altimetry
spatial distribution
Atlantic Ocean
Atlantic Ocean (Southwest)
Zapiola Rise
Saraceno, Martin
On eddy polarity distribution in the southwestern Atlantic
topic_facet Eddies
Southwestern Atlantic
Zapiola Drift
Antarctic Circumpolar Currents
Anticyclonic circulation
Anticyclonic eddies
Bottom topography
Chlorophyll a
Chlorophyll-a concentration
Cyclonic eddy
Eddies
Potential vorticity
Satellite altimetry data
South Atlantic
Southwestern Atlantic
Zapiola Drift
Ocean currents
Chlorophyll
anticyclone
bottom topography
chlorophyll a
circumpolar current
concentration (composition)
eddy
potential vorticity
satellite altimetry
spatial distribution
Atlantic Ocean
Atlantic Ocean (Southwest)
Zapiola Rise
description Eddies in the southwestern Atlantic were detected from more than 18 years of satellite altimetry data using a modified version of the Okubo-Weiss method. The spatial distribution and polarity of eddies were examined. A larger concentration of cyclonic (anticyclonic) eddies was found on the left (right) side when looking downstream on some of the largest current systems in the region, such as the South Atlantic Current, the anticyclonic circulation associated with the Zapiola Drift (ZD) and the northern branch of the Antarctic Circumpolar Current. In the region isolated by the anticyclonic Zapiola Current, 91% of eddies were cyclonic. The observed distribution of eddies is in agreement with the generation of eddies from meanders of the above-mentioned currents: cyclonic (anticyclonic) eddies might detach from a meander of the current on the left (right) side when looking downstream on the current. Furthermore, in the ZD area, the bottom topography plays a key role in determining the trajectory of eddies: the anticyclonic current associated with the ZD meanders and eventually generates a cyclonic eddy that enters the ZD region only across the northeastern border, where the gradient of potential vorticity is lower. Finally, average surface chlorophyll-a concentration inside cyclonic and anticyclonic eddies shows that the former have higher chlorophyll-a values. Thus, on average, the classical eddy-pumping theory explains the difference in chlorophyll-a concentration within eddies in the southwestern Atlantic. © 2012 Elsevier Ltd.
author Saraceno, Martin
author_facet Saraceno, Martin
author_sort Saraceno, Martin
title On eddy polarity distribution in the southwestern Atlantic
title_short On eddy polarity distribution in the southwestern Atlantic
title_full On eddy polarity distribution in the southwestern Atlantic
title_fullStr On eddy polarity distribution in the southwestern Atlantic
title_full_unstemmed On eddy polarity distribution in the southwestern Atlantic
title_sort on eddy polarity distribution in the southwestern atlantic
publishDate 2012
url https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_09670637_v69_n_p62_Saraceno
http://hdl.handle.net/20.500.12110/paper_09670637_v69_n_p62_Saraceno
work_keys_str_mv AT saracenomartin oneddypolaritydistributioninthesouthwesternatlantic
_version_ 1768542422274408448

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