Time-space variability of satellite chlorophyll-α in the Easter Island Province, southeastern Pacific Ocean

The Easter Island Province (EIP) encompasses Easter Island (EI) and Salas y Gómez Island (SGI), which are located in the eastern boundary of the south Pacific subtropical gyre. This province is one of the most oligotrophic region in the world ocean with a high degree of endemism and distinguished by...

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Autores principales:	Andrade,Isabel, Hormazábal,Samuel, Correa-Ramírez,Marco
Lenguaje:	English
Publicado:	Pontificia Universidad Católica de Valparaíso. Facultad de Recursos Naturales. Escuela de Ciencias del Mar 2014
Materias:	satellite chlorophyll-α mesoscale and submesoscale eddies subtropical anticyclonic gyre Easter Island Salas y Gómez Island southeastern Pacific
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-560X2014000400013
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spelling	oai:scielo:S0718-560X20140004000132014-12-15Time-space variability of satellite chlorophyll-α in the Easter Island Province, southeastern Pacific OceanAndrade,IsabelHormazábal,SamuelCorrea-Ramírez,Marco satellite chlorophyll-α mesoscale and submesoscale eddies subtropical anticyclonic gyre Easter Island Salas y Gómez Island southeastern Pacific The Easter Island Province (EIP) encompasses Easter Island (EI) and Salas y Gómez Island (SGI), which are located in the eastern boundary of the south Pacific subtropical gyre. This province is one of the most oligotrophic region in the world ocean with a high degree of endemism and distinguished by having the clearest waters in the world. Issues related to the biophysical coupling that sustains biological production in this region are still poorly understood. Satellite data compiled over a ten year period was used to characterize the spatial and temporal chlorophyll-α (Chl-α) variability around the EIP and determine the relationship between Chl-α and several physical forcing. Results shows a clear Chl-α annual cycle around the EIP, with maximum concentration during the austral winter. Chl-α spatial distribution shows a strong zonal dipole over EI that divides the island into two zones: southeast and northwest. Due to its small size and low elevation of SGI, it does not generate a significant local effect in Chl-α concentration, but a Chl-α increase is observed southeast of this island (~2 km) associated to a seamount. The mean geostrophic current in the EIP flows eastward, associated with the southeastern boundary of the subtropical gyre. However, recurrent mesoscale eddies traveling northwestward and produce large surface current variability with periods of high velocities in opposite direction. In the spring, wakes of high Chl-α concentration can be observed over EI, associated with the generation and detachment of submesoscale eddies from EI, which could have important biological implications during periods of low regional biological production.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=S0718-560X2014000400013en10.3856/vol42-issue4-fulltext-13
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	satellite chlorophyll-α mesoscale and submesoscale eddies subtropical anticyclonic gyre Easter Island Salas y Gómez Island southeastern Pacific
spellingShingle	satellite chlorophyll-α mesoscale and submesoscale eddies subtropical anticyclonic gyre Easter Island Salas y Gómez Island southeastern Pacific Andrade,Isabel Hormazábal,Samuel Correa-Ramírez,Marco Time-space variability of satellite chlorophyll-α in the Easter Island Province, southeastern Pacific Ocean
description	The Easter Island Province (EIP) encompasses Easter Island (EI) and Salas y Gómez Island (SGI), which are located in the eastern boundary of the south Pacific subtropical gyre. This province is one of the most oligotrophic region in the world ocean with a high degree of endemism and distinguished by having the clearest waters in the world. Issues related to the biophysical coupling that sustains biological production in this region are still poorly understood. Satellite data compiled over a ten year period was used to characterize the spatial and temporal chlorophyll-α (Chl-α) variability around the EIP and determine the relationship between Chl-α and several physical forcing. Results shows a clear Chl-α annual cycle around the EIP, with maximum concentration during the austral winter. Chl-α spatial distribution shows a strong zonal dipole over EI that divides the island into two zones: southeast and northwest. Due to its small size and low elevation of SGI, it does not generate a significant local effect in Chl-α concentration, but a Chl-α increase is observed southeast of this island (~2 km) associated to a seamount. The mean geostrophic current in the EIP flows eastward, associated with the southeastern boundary of the subtropical gyre. However, recurrent mesoscale eddies traveling northwestward and produce large surface current variability with periods of high velocities in opposite direction. In the spring, wakes of high Chl-α concentration can be observed over EI, associated with the generation and detachment of submesoscale eddies from EI, which could have important biological implications during periods of low regional biological production.
author	Andrade,Isabel Hormazábal,Samuel Correa-Ramírez,Marco
author_facet	Andrade,Isabel Hormazábal,Samuel Correa-Ramírez,Marco
author_sort	Andrade,Isabel
title	Time-space variability of satellite chlorophyll-α in the Easter Island Province, southeastern Pacific Ocean
title_short	Time-space variability of satellite chlorophyll-α in the Easter Island Province, southeastern Pacific Ocean
title_full	Time-space variability of satellite chlorophyll-α in the Easter Island Province, southeastern Pacific Ocean
title_fullStr	Time-space variability of satellite chlorophyll-α in the Easter Island Province, southeastern Pacific Ocean
title_full_unstemmed	Time-space variability of satellite chlorophyll-α in the Easter Island Province, southeastern Pacific Ocean
title_sort	time-space variability of satellite chlorophyll-α in the easter island province, southeastern pacific ocean
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=S0718-560X2014000400013
work_keys_str_mv	AT andradeisabel timespacevariabilityofsatellitechlorophyll945intheeasterislandprovincesoutheasternpacificocean AT hormazabalsamuel timespacevariabilityofsatellitechlorophyll945intheeasterislandprovincesoutheasternpacificocean AT correaramirezmarco timespacevariabilityofsatellitechlorophyll945intheeasterislandprovincesoutheasternpacificocean
_version_	1714205131742904320

Time-space variability of satellite chlorophyll-&#945; in the Easter Island Province, southeastern Pacific Ocean

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Time-space variability of satellite chlorophyll-α in the Easter Island Province, southeastern Pacific Ocean