Intrathermocline eddies at the Juan Fernández Archipelago, southeastern Pacific

Regional Ocean Modeling System (ROMS) results, combined with chlorophyll-α (Chl-α) and satellite altimetry information as well as information from oceanographic cruises were analyzed to identify interactions between intrathermocline eddies (ITEs) and the Juan Fernández Archipelago...

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Autores principales:	Andrade,Isabel, Hormazábal,Samuel, Combes,Vincent
Lenguaje:	English
Publicado:	Pontificia Universidad Católica de Valparaíso. Facultad de Recursos Naturales. Escuela de Ciencias del Mar 2014
Materias:	intrathermocline eddies Juan Fernández Archipelago southeastern Pacific Ocean
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-560X2014000400014
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spelling	oai:scielo:S0718-560X20140004000142014-12-15Intrathermocline eddies at the Juan Fernández Archipelago, southeastern PacificAndrade,IsabelHormazábal,SamuelCombes,Vincent intrathermocline eddies Juan Fernández Archipelago southeastern Pacific Ocean Regional Ocean Modeling System (ROMS) results, combined with chlorophyll-α (Chl-α) and satellite altimetry information as well as information from oceanographic cruises were analyzed to identify interactions between intrathermocline eddies (ITEs) and the Juan Fernández Archipelago (JFA), and discuss their potential impact on surface Chl-α concentrations. The JFA is located off the coast of central Chile (33°S), and is composed of three main islands: Robinson Crusoe (RC), Alejandro Selkirk (AS) and Santa Clara (SC). Results indicate that the surface and subsurface anticyclonic eddies that interact with the JFA are formed primarily within the coastal transition zone between 33° and 39°S. ITEs are present within the JFA region with a semiannual frequency, mainly during the austral autumn, and have a weak surface expression in relation to the adjacent surface eddies, with a slow displacement (1.16 to 1.4 km d-1) in a northwest direction and a coherent structure for periods of ≥ 1 year. During the ITEs' interaction with RC-SC islands and an adjacent seamount, a slight (prominent) thermocline deflection of the upper limit (lower) was observed. The horizontal extent (~70-100 km) was greater than the internal Rossby deformation radius and the average vertical extent was ~400 m. The interaction between the weak surface expression of ITEs, identified with satellite altimetry, and the JFA persisted during autumn for nine weeks until reaching the winter period. Approximately one month after the beginning of the interaction between ITEs and the islands, increases in surface Chl-α associated with the eddy were observed, with values up to three times higher than adjacent oceanic waters.info:eu-repo/semantics/openAccessPontificia Universidad Católica de Valparaíso. Facultad de Recursos Naturales. Escuela de Ciencias del MarLatin american journal of aquatic research v.42 n.4 20142014-10-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-560X2014000400014en10.3856/vol42-issue4-fulltext-14
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	intrathermocline eddies Juan Fernández Archipelago southeastern Pacific Ocean
spellingShingle	intrathermocline eddies Juan Fernández Archipelago southeastern Pacific Ocean Andrade,Isabel Hormazábal,Samuel Combes,Vincent Intrathermocline eddies at the Juan Fernández Archipelago, southeastern Pacific
description	Regional Ocean Modeling System (ROMS) results, combined with chlorophyll-α (Chl-α) and satellite altimetry information as well as information from oceanographic cruises were analyzed to identify interactions between intrathermocline eddies (ITEs) and the Juan Fernández Archipelago (JFA), and discuss their potential impact on surface Chl-α concentrations. The JFA is located off the coast of central Chile (33°S), and is composed of three main islands: Robinson Crusoe (RC), Alejandro Selkirk (AS) and Santa Clara (SC). Results indicate that the surface and subsurface anticyclonic eddies that interact with the JFA are formed primarily within the coastal transition zone between 33° and 39°S. ITEs are present within the JFA region with a semiannual frequency, mainly during the austral autumn, and have a weak surface expression in relation to the adjacent surface eddies, with a slow displacement (1.16 to 1.4 km d-1) in a northwest direction and a coherent structure for periods of ≥ 1 year. During the ITEs' interaction with RC-SC islands and an adjacent seamount, a slight (prominent) thermocline deflection of the upper limit (lower) was observed. The horizontal extent (~70-100 km) was greater than the internal Rossby deformation radius and the average vertical extent was ~400 m. The interaction between the weak surface expression of ITEs, identified with satellite altimetry, and the JFA persisted during autumn for nine weeks until reaching the winter period. Approximately one month after the beginning of the interaction between ITEs and the islands, increases in surface Chl-α associated with the eddy were observed, with values up to three times higher than adjacent oceanic waters.
author	Andrade,Isabel Hormazábal,Samuel Combes,Vincent
author_facet	Andrade,Isabel Hormazábal,Samuel Combes,Vincent
author_sort	Andrade,Isabel
title	Intrathermocline eddies at the Juan Fernández Archipelago, southeastern Pacific
title_short	Intrathermocline eddies at the Juan Fernández Archipelago, southeastern Pacific
title_full	Intrathermocline eddies at the Juan Fernández Archipelago, southeastern Pacific
title_fullStr	Intrathermocline eddies at the Juan Fernández Archipelago, southeastern Pacific
title_full_unstemmed	Intrathermocline eddies at the Juan Fernández Archipelago, southeastern Pacific
title_sort	intrathermocline eddies at the juan fernández archipelago, southeastern pacific
publisher	Pontificia Universidad Católica de Valparaíso. Facultad de Recursos Naturales. Escuela de Ciencias del Mar
publishDate	2014
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-560X2014000400014
work_keys_str_mv	AT andradeisabel intrathermoclineeddiesatthejuanfernandezarchipelagosoutheasternpacific AT hormazabalsamuel intrathermoclineeddiesatthejuanfernandezarchipelagosoutheasternpacific AT combesvincent intrathermoclineeddiesatthejuanfernandezarchipelagosoutheasternpacific
_version_	1714205131935842304

Intrathermocline eddies at the Juan Fernández Archipelago, southeastern Pacific

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