Vertical stratification and air-sea CO2 fluxes in the Patagonian shelf

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The thermohaline structure across the tidal fronts of the continental shelf off Patagonia is analyzed using historical and recent summer hydrographic sections. The near-summer tidal front location is determined on the basis of the magnitude of vertical stratification of the water column as measured...

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Autores principales:	Bianchi, A.A., Bianucci, L., Piola, A.R., Pino, D.R., Schloss, I., Poisson, A., Balestrini, C.F.
Formato:	Artículo publishedVersion
Publicado:	2005
Materias:	air-sea interaction carbon dioxide stratification surface flux Atlantic Ocean oceanic regions Patagonian Shelf World
Acceso en línea:	http://hdl.handle.net/20.500.12110/paper_01480227_v110_n7_p1_Bianchi https://repositoriouba.sisbi.uba.ar/gsdl/cgi-bin/library.cgi?a=d&c=artiaex&d=paper_01480227_v110_n7_p1_Bianchi_oai
Aporte de:	Repositorio Digital de la Universidad de Buenos Aires (UBA) de Universidad de Buenos Aires

id	I28-R145-paper_01480227_v110_n7_p1_Bianchi_oai
record_format	dspace
spelling	I28-R145-paper_01480227_v110_n7_p1_Bianchi_oai2024-08-16 Bianchi, A.A. Bianucci, L. Piola, A.R. Pino, D.R. Schloss, I. Poisson, A. Balestrini, C.F. 2005 The thermohaline structure across the tidal fronts of the continental shelf off Patagonia is analyzed using historical and recent summer hydrographic sections. The near-summer tidal front location is determined on the basis of the magnitude of vertical stratification of the water column as measured by the Simpson parameter. Sea surface and air CO2 partial pressures based on data from eleven transects collected in summer and fall from 2000 to 2004 are used to estimate CO2 fluxes over the shelf. The near-shore waters are a source of CO2 to the atmosphere while the midshelf region is a CO2 sink. The transition between source and sink regions closely follows the location of tidal fronts, suggesting a link between vertical stratification of the water column and the regional CO2 balance. The highest surface values of Chl a are associated with the strongest CO2 sinks. The colocation of lowest CO2 partial pressure (pCO2) and highest Chl a suggests that phytoplankton blooms on the stratified side of the fronts draw the ocean's CO2 to very low levels. The mean shelf sea-air difference in pCO2 (ΔpCO2) is -24 μatm and rises to -29 μatm if the shelf break front is included. Peaks in ΔpCO2 of -110 μatm, among the highest observed in the global ocean, are observed. The estimated summer mean CO2 flux over the shelf is -4.4 mmol m-2 d-1 and rises to -5.7 mmol m-2 d-1 when the shelf break area is taken into account. Thus, during the warm season the shelf off Patagonia is a significant atmospheric CO2 sink. Copyright 2005 by the American Geophysical Union. Fil:Schloss, I. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. application/pdf http://hdl.handle.net/20.500.12110/paper_01480227_v110_n7_p1_Bianchi info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar J. Geophys. Res. C Oceans 2005;110(7):1-10 air-sea interaction carbon dioxide stratification surface flux Atlantic Ocean oceanic regions Patagonian Shelf World Vertical stratification and air-sea CO2 fluxes in the Patagonian shelf info:eu-repo/semantics/article info:ar-repo/semantics/artículo info:eu-repo/semantics/publishedVersion https://repositoriouba.sisbi.uba.ar/gsdl/cgi-bin/library.cgi?a=d&c=artiaex&d=paper_01480227_v110_n7_p1_Bianchi_oai
institution	Universidad de Buenos Aires
institution_str	I-28
repository_str	R-145
collection	Repositorio Digital de la Universidad de Buenos Aires (UBA)
topic	air-sea interaction carbon dioxide stratification surface flux Atlantic Ocean oceanic regions Patagonian Shelf World
spellingShingle	air-sea interaction carbon dioxide stratification surface flux Atlantic Ocean oceanic regions Patagonian Shelf World Bianchi, A.A. Bianucci, L. Piola, A.R. Pino, D.R. Schloss, I. Poisson, A. Balestrini, C.F. Vertical stratification and air-sea CO2 fluxes in the Patagonian shelf
topic_facet	air-sea interaction carbon dioxide stratification surface flux Atlantic Ocean oceanic regions Patagonian Shelf World
description	The thermohaline structure across the tidal fronts of the continental shelf off Patagonia is analyzed using historical and recent summer hydrographic sections. The near-summer tidal front location is determined on the basis of the magnitude of vertical stratification of the water column as measured by the Simpson parameter. Sea surface and air CO2 partial pressures based on data from eleven transects collected in summer and fall from 2000 to 2004 are used to estimate CO2 fluxes over the shelf. The near-shore waters are a source of CO2 to the atmosphere while the midshelf region is a CO2 sink. The transition between source and sink regions closely follows the location of tidal fronts, suggesting a link between vertical stratification of the water column and the regional CO2 balance. The highest surface values of Chl a are associated with the strongest CO2 sinks. The colocation of lowest CO2 partial pressure (pCO2) and highest Chl a suggests that phytoplankton blooms on the stratified side of the fronts draw the ocean's CO2 to very low levels. The mean shelf sea-air difference in pCO2 (ΔpCO2) is -24 μatm and rises to -29 μatm if the shelf break front is included. Peaks in ΔpCO2 of -110 μatm, among the highest observed in the global ocean, are observed. The estimated summer mean CO2 flux over the shelf is -4.4 mmol m-2 d-1 and rises to -5.7 mmol m-2 d-1 when the shelf break area is taken into account. Thus, during the warm season the shelf off Patagonia is a significant atmospheric CO2 sink. Copyright 2005 by the American Geophysical Union.
format	Artículo Artículo publishedVersion
author	Bianchi, A.A. Bianucci, L. Piola, A.R. Pino, D.R. Schloss, I. Poisson, A. Balestrini, C.F.
author_facet	Bianchi, A.A. Bianucci, L. Piola, A.R. Pino, D.R. Schloss, I. Poisson, A. Balestrini, C.F.
author_sort	Bianchi, A.A.
title	Vertical stratification and air-sea CO2 fluxes in the Patagonian shelf
title_short	Vertical stratification and air-sea CO2 fluxes in the Patagonian shelf
title_full	Vertical stratification and air-sea CO2 fluxes in the Patagonian shelf
title_fullStr	Vertical stratification and air-sea CO2 fluxes in the Patagonian shelf
title_full_unstemmed	Vertical stratification and air-sea CO2 fluxes in the Patagonian shelf
title_sort	vertical stratification and air-sea co2 fluxes in the patagonian shelf
publishDate	2005
url	http://hdl.handle.net/20.500.12110/paper_01480227_v110_n7_p1_Bianchi https://repositoriouba.sisbi.uba.ar/gsdl/cgi-bin/library.cgi?a=d&c=artiaex&d=paper_01480227_v110_n7_p1_Bianchi_oai
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Vertical stratification and air-sea CO2 fluxes in the Patagonian shelf

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