Wind modulation of upwelling at the shelf-break front off Patagonia: Observational evidence

Autores
Carranza, Magdalena; Gille, Sarah; Piola, Alberto Ricardo; Charo, M.; Romero, S. I.
Año de publicación
2017
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
The South-Atlantic Patagonian shelf is the largest chlorophyll-a (Chl-a) hot spot in Southern Ocean color images. While a persistent 1500 km long band of high Chl-a along the shelf-break front (SBF) is indicative of upwelling, the mechanisms that drive it are not entirely known. Along-front wind oscillations can enhance upwelling and provide a nutrient pumping mechanism at shelf-break fronts of western boundary currents. Here we assess wind-induced upwelling at the SBF off Patagonia from daily satellite Chl-a and winds, historical hydrographic observations, cross-shelf Chl-a fluorescence transects from two cruises, and in situ winds and water column structure from a mooring site. Satellite Chl-a composites segregated by along-front wind direction indicate that surface Chl-a is enhanced at the SBF with southerly winds and suppressed with northerly winds. Northerly winds also result in enhanced Chl-a further offshore (∼25–50 km). Synoptic transects as well as mean hydrographic sections segregated by along-front winds show isopycnals tilted upward for southerly winds. Spring observations from the mooring also suggest that southerly winds destratify the water column and northerly winds restratify, in agreement with Ekman transport interacting with the front. Moreover, changes in water column temperature lag along-front wind forcing by 2–4 days. Our results suggest that oscillations in along-front winds, on timescales typical of atmospheric storms (2–10 days), can significantly modulate the upwelling and Chl-a concentrations at the SBF off Patagonia, revealing the importance of wind-induced upwelling for shelf-slope exchange at shelf-break fronts of western boundary currents.
Fil: Carranza, Magdalena. University of California at San Diego. Scripps Institution of Oceanography; Estados Unidos
Fil: Gille, Sarah. University of California at San Diego. Scripps Institution of Oceanography; Estados Unidos
Fil: Piola, Alberto Ricardo. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Ministerio de Defensa. Armada Argentina. Servicio de Hidrografía Naval. Departamento Oceanografía; Argentina. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Departamento de Ciencias de la Atmósfera y los Océanos; Argentina. Instituto Franco‐Argentino sobre Estudios de Clima y sus Impactos; Argentina
Fil: Charo, M.. Ministerio de Defensa. Armada Argentina. Servicio de Hidrografía Naval. Departamento Oceanografía; Argentina
Fil: Romero, S. I.. Ministerio de Defensa. Armada Argentina. Servicio de Hidrografía Naval. Departamento Oceanografía; Argentina
Materia
Along-Front Winds
Chlorophyll-A
Patagonian Shelf
Shelf-Break Front Upwelling
Shelf-Slope Exchange
Wind Modulation
Nivel de accesibilidad
acceso abierto
Condiciones de uso
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
Repositorio
CONICET Digital (CONICET)
Institución
Consejo Nacional de Investigaciones Científicas y Técnicas
OAI Identificador
oai:ri.conicet.gov.ar:11336/72875
Acceder
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network_acronym_str CONICETDig
repository_id_str 3498
network_name_str CONICET Digital (CONICET)
spelling Wind modulation of upwelling at the shelf-break front off Patagonia: Observational evidenceCarranza, MagdalenaGille, SarahPiola, Alberto RicardoCharo, M.Romero, S. I.Along-Front WindsChlorophyll-APatagonian ShelfShelf-Break Front UpwellingShelf-Slope ExchangeWind Modulationhttps://purl.org/becyt/ford/1.5https://purl.org/becyt/ford/1The South-Atlantic Patagonian shelf is the largest chlorophyll-a (Chl-a) hot spot in Southern Ocean color images. While a persistent 1500 km long band of high Chl-a along the shelf-break front (SBF) is indicative of upwelling, the mechanisms that drive it are not entirely known. Along-front wind oscillations can enhance upwelling and provide a nutrient pumping mechanism at shelf-break fronts of western boundary currents. Here we assess wind-induced upwelling at the SBF off Patagonia from daily satellite Chl-a and winds, historical hydrographic observations, cross-shelf Chl-a fluorescence transects from two cruises, and in situ winds and water column structure from a mooring site. Satellite Chl-a composites segregated by along-front wind direction indicate that surface Chl-a is enhanced at the SBF with southerly winds and suppressed with northerly winds. Northerly winds also result in enhanced Chl-a further offshore (∼25–50 km). Synoptic transects as well as mean hydrographic sections segregated by along-front winds show isopycnals tilted upward for southerly winds. Spring observations from the mooring also suggest that southerly winds destratify the water column and northerly winds restratify, in agreement with Ekman transport interacting with the front. Moreover, changes in water column temperature lag along-front wind forcing by 2–4 days. Our results suggest that oscillations in along-front winds, on timescales typical of atmospheric storms (2–10 days), can significantly modulate the upwelling and Chl-a concentrations at the SBF off Patagonia, revealing the importance of wind-induced upwelling for shelf-slope exchange at shelf-break fronts of western boundary currents.Fil: Carranza, Magdalena. University of California at San Diego. Scripps Institution of Oceanography; Estados UnidosFil: Gille, Sarah. University of California at San Diego. Scripps Institution of Oceanography; Estados UnidosFil: Piola, Alberto Ricardo. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Ministerio de Defensa. Armada Argentina. Servicio de Hidrografía Naval. Departamento Oceanografía; Argentina. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Departamento de Ciencias de la Atmósfera y los Océanos; Argentina. Instituto Franco‐Argentino sobre Estudios de Clima y sus Impactos; ArgentinaFil: Charo, M.. Ministerio de Defensa. Armada Argentina. Servicio de Hidrografía Naval. Departamento Oceanografía; ArgentinaFil: Romero, S. I.. Ministerio de Defensa. Armada Argentina. Servicio de Hidrografía Naval. Departamento Oceanografía; ArgentinaAmerican Geophysical Union2017-03info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/72875Carranza, Magdalena; Gille, Sarah; Piola, Alberto Ricardo; Charo, M.; Romero, S. I.; Wind modulation of upwelling at the shelf-break front off Patagonia: Observational evidence; American Geophysical Union; Journal of Geophysical Research; 122; 3; 3-2017; 2401-24210148-02272169-9291CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/url/https://agupubs.onlinelibrary.wiley.com/doi/full/10.1002/2016JC012059info:eu-repo/semantics/altIdentifier/doi/10.1002/2016JC012059info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-10T13:06:01Zoai:ri.conicet.gov.ar:11336/72875instacron:CONICETInstitucionalhttp://ri.conicet.gov.ar/Organismo científico-tecnológicoNo correspondehttp://ri.conicet.gov.ar/oai/requestdasensio@conicet.gov.ar; lcarlino@conicet.gov.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:34982025-09-10 13:06:01.866CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv Wind modulation of upwelling at the shelf-break front off Patagonia: Observational evidence
title Wind modulation of upwelling at the shelf-break front off Patagonia: Observational evidence
spellingShingle Wind modulation of upwelling at the shelf-break front off Patagonia: Observational evidence
Carranza, Magdalena
Along-Front Winds
Chlorophyll-A
Patagonian Shelf
Shelf-Break Front Upwelling
Shelf-Slope Exchange
Wind Modulation
title_short Wind modulation of upwelling at the shelf-break front off Patagonia: Observational evidence
title_full Wind modulation of upwelling at the shelf-break front off Patagonia: Observational evidence
title_fullStr Wind modulation of upwelling at the shelf-break front off Patagonia: Observational evidence
title_full_unstemmed Wind modulation of upwelling at the shelf-break front off Patagonia: Observational evidence
title_sort Wind modulation of upwelling at the shelf-break front off Patagonia: Observational evidence
dc.creator.none.fl_str_mv Carranza, Magdalena
Gille, Sarah
Piola, Alberto Ricardo
Charo, M.
Romero, S. I.
author Carranza, Magdalena
author_facet Carranza, Magdalena
Gille, Sarah
Piola, Alberto Ricardo
Charo, M.
Romero, S. I.
author_role author
author2 Gille, Sarah
Piola, Alberto Ricardo
Charo, M.
Romero, S. I.
author2_role author
author
author
author
dc.subject.none.fl_str_mv Along-Front Winds
Chlorophyll-A
Patagonian Shelf
Shelf-Break Front Upwelling
Shelf-Slope Exchange
Wind Modulation
topic Along-Front Winds
Chlorophyll-A
Patagonian Shelf
Shelf-Break Front Upwelling
Shelf-Slope Exchange
Wind Modulation
purl_subject.fl_str_mv https://purl.org/becyt/ford/1.5
https://purl.org/becyt/ford/1
dc.description.none.fl_txt_mv The South-Atlantic Patagonian shelf is the largest chlorophyll-a (Chl-a) hot spot in Southern Ocean color images. While a persistent 1500 km long band of high Chl-a along the shelf-break front (SBF) is indicative of upwelling, the mechanisms that drive it are not entirely known. Along-front wind oscillations can enhance upwelling and provide a nutrient pumping mechanism at shelf-break fronts of western boundary currents. Here we assess wind-induced upwelling at the SBF off Patagonia from daily satellite Chl-a and winds, historical hydrographic observations, cross-shelf Chl-a fluorescence transects from two cruises, and in situ winds and water column structure from a mooring site. Satellite Chl-a composites segregated by along-front wind direction indicate that surface Chl-a is enhanced at the SBF with southerly winds and suppressed with northerly winds. Northerly winds also result in enhanced Chl-a further offshore (∼25–50 km). Synoptic transects as well as mean hydrographic sections segregated by along-front winds show isopycnals tilted upward for southerly winds. Spring observations from the mooring also suggest that southerly winds destratify the water column and northerly winds restratify, in agreement with Ekman transport interacting with the front. Moreover, changes in water column temperature lag along-front wind forcing by 2–4 days. Our results suggest that oscillations in along-front winds, on timescales typical of atmospheric storms (2–10 days), can significantly modulate the upwelling and Chl-a concentrations at the SBF off Patagonia, revealing the importance of wind-induced upwelling for shelf-slope exchange at shelf-break fronts of western boundary currents.
Fil: Carranza, Magdalena. University of California at San Diego. Scripps Institution of Oceanography; Estados Unidos
Fil: Gille, Sarah. University of California at San Diego. Scripps Institution of Oceanography; Estados Unidos
Fil: Piola, Alberto Ricardo. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Ministerio de Defensa. Armada Argentina. Servicio de Hidrografía Naval. Departamento Oceanografía; Argentina. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Departamento de Ciencias de la Atmósfera y los Océanos; Argentina. Instituto Franco‐Argentino sobre Estudios de Clima y sus Impactos; Argentina
Fil: Charo, M.. Ministerio de Defensa. Armada Argentina. Servicio de Hidrografía Naval. Departamento Oceanografía; Argentina
Fil: Romero, S. I.. Ministerio de Defensa. Armada Argentina. Servicio de Hidrografía Naval. Departamento Oceanografía; Argentina
description The South-Atlantic Patagonian shelf is the largest chlorophyll-a (Chl-a) hot spot in Southern Ocean color images. While a persistent 1500 km long band of high Chl-a along the shelf-break front (SBF) is indicative of upwelling, the mechanisms that drive it are not entirely known. Along-front wind oscillations can enhance upwelling and provide a nutrient pumping mechanism at shelf-break fronts of western boundary currents. Here we assess wind-induced upwelling at the SBF off Patagonia from daily satellite Chl-a and winds, historical hydrographic observations, cross-shelf Chl-a fluorescence transects from two cruises, and in situ winds and water column structure from a mooring site. Satellite Chl-a composites segregated by along-front wind direction indicate that surface Chl-a is enhanced at the SBF with southerly winds and suppressed with northerly winds. Northerly winds also result in enhanced Chl-a further offshore (∼25–50 km). Synoptic transects as well as mean hydrographic sections segregated by along-front winds show isopycnals tilted upward for southerly winds. Spring observations from the mooring also suggest that southerly winds destratify the water column and northerly winds restratify, in agreement with Ekman transport interacting with the front. Moreover, changes in water column temperature lag along-front wind forcing by 2–4 days. Our results suggest that oscillations in along-front winds, on timescales typical of atmospheric storms (2–10 days), can significantly modulate the upwelling and Chl-a concentrations at the SBF off Patagonia, revealing the importance of wind-induced upwelling for shelf-slope exchange at shelf-break fronts of western boundary currents.
publishDate 2017
dc.date.none.fl_str_mv 2017-03
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
http://purl.org/coar/resource_type/c_6501
info:ar-repo/semantics/articulo
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/11336/72875
Carranza, Magdalena; Gille, Sarah; Piola, Alberto Ricardo; Charo, M.; Romero, S. I.; Wind modulation of upwelling at the shelf-break front off Patagonia: Observational evidence; American Geophysical Union; Journal of Geophysical Research; 122; 3; 3-2017; 2401-2421
0148-0227
2169-9291
CONICET Digital
CONICET
url http://hdl.handle.net/11336/72875
identifier_str_mv Carranza, Magdalena; Gille, Sarah; Piola, Alberto Ricardo; Charo, M.; Romero, S. I.; Wind modulation of upwelling at the shelf-break front off Patagonia: Observational evidence; American Geophysical Union; Journal of Geophysical Research; 122; 3; 3-2017; 2401-2421
0148-0227
2169-9291
CONICET Digital
CONICET
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/url/https://agupubs.onlinelibrary.wiley.com/doi/full/10.1002/2016JC012059
info:eu-repo/semantics/altIdentifier/doi/10.1002/2016JC012059
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
eu_rights_str_mv openAccess
rights_invalid_str_mv https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.format.none.fl_str_mv application/pdf
application/pdf
dc.publisher.none.fl_str_mv American Geophysical Union
publisher.none.fl_str_mv American Geophysical Union
dc.source.none.fl_str_mv reponame:CONICET Digital (CONICET)
instname:Consejo Nacional de Investigaciones Científicas y Técnicas
reponame_str CONICET Digital (CONICET)
collection CONICET Digital (CONICET)
instname_str Consejo Nacional de Investigaciones Científicas y Técnicas
repository.name.fl_str_mv CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicas
repository.mail.fl_str_mv dasensio@conicet.gov.ar; lcarlino@conicet.gov.ar
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score 12.993085

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