Carbon cycling in a large coastal embayment, affected by wind-driven upwelling: short-time-scale variability and spatial differences
16 pages, 7 figures, 4 tables. Carbon species fluxes and net budgets were studied with a 2-D box model in the Ría de Arousa (Spain), a large indentation in the NW Iberian upwelling system. The embayment acted as a CO2 source to the atmosphere during the upwelling season (average CO2 flux across the...
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Language: | English |
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Inter Research
1999
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Online Access: | http://hdl.handle.net/10261/25326 https://doi.org/10.3354/meps176215 |
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ftcsic:oai:digital.csic.es:10261/25326 2024-02-11T10:06:50+01:00 Carbon cycling in a large coastal embayment, affected by wind-driven upwelling: short-time-scale variability and spatial differences Rosón, Gabriel Álvarez-Salgado, Xosé Antón Pérez, Fiz F. 1999-01-18 1423814 bytes application/pdf http://hdl.handle.net/10261/25326 https://doi.org/10.3354/meps176215 en eng Inter Research http://dx.doi.org/10.3354/meps176215 Marine Ecology Progress Series 176: 215-230 (1999) 0171-8630 http://hdl.handle.net/10261/25326 doi:10.3354/meps176215 open Carbon fluxes Biogeochemical cycling Upwelling stress-relaxation Downwelling Rías Baixas (NW Spain) artículo http://purl.org/coar/resource_type/c_6501 1999 ftcsic https://doi.org/10.3354/meps176215 2024-01-16T09:27:18Z 16 pages, 7 figures, 4 tables. Carbon species fluxes and net budgets were studied with a 2-D box model in the Ría de Arousa (Spain), a large indentation in the NW Iberian upwelling system. The embayment acted as a CO2 source to the atmosphere during the upwelling season (average CO2 flux across the seawater-air interface, FCO2 = +16 mg C m-2 d-1), despite the elevated net community production (NCP) rates (average NCP = 0.84 g C m-2 d-1). The high pCO2 levels in source Eastern North Atlantic Central Water (ENACW) and the reduced residence times within the Ría (~6 d) seem to be the reasons for the observed FCO2. The CO2 increase associated with CaCO3 fixation by the intensive culture of mussels on hanging ropes did not affect FCO2 significantly. High FCO2 values were observed during strong upwelling, which was 3 times larger than the average during the upwelling season. Under these conditions the CO2-rich source ENACW reached the surface and this coincided with low phytoplankton production (NCP = -0.01 g C m-2 d-1). Source ENACW was enriched within the Ría with carbon released from the sediments. FCO2 was reduced to 1/3 of its value compared to the average upwelling season under conditions of moderate upwelling. Phytoplankton grew rapidly (average NCP = 1.49 g C m-2 d-1) at the expense of the gentle injection of new nutrients at the base of the pycnocline. Negligible FCO2 values were observed during upwelling relaxations, when ENACW into the Ría was replaced by the warm and CO2-equilibrated shelf surface waters. FCO2 reached a maximum during a strong autumn downwelling event because of the concurrence of warm shelf surface water flow into the Ría with strong carbon release from the sediments. CO2 fluxes per unit area always increased coastwards, because of the progressive CO2 enrichment of the source ENACW as it enters the embayment and the decrease of residence times. Support for this work came from C.I.C.Y.T grant number MAR88- 0245 and funds from the Conselleria de Pesca da Xunta de Galicia. Fellowships ... Article in Journal/Newspaper North Atlantic Digital.CSIC (Spanish National Research Council) Marine Ecology Progress Series 176 215 230 |
institution |
Open Polar |
collection |
Digital.CSIC (Spanish National Research Council) |
op_collection_id |
ftcsic |
language |
English |
topic |
Carbon fluxes Biogeochemical cycling Upwelling stress-relaxation Downwelling Rías Baixas (NW Spain) |
spellingShingle |
Carbon fluxes Biogeochemical cycling Upwelling stress-relaxation Downwelling Rías Baixas (NW Spain) Rosón, Gabriel Álvarez-Salgado, Xosé Antón Pérez, Fiz F. Carbon cycling in a large coastal embayment, affected by wind-driven upwelling: short-time-scale variability and spatial differences |
topic_facet |
Carbon fluxes Biogeochemical cycling Upwelling stress-relaxation Downwelling Rías Baixas (NW Spain) |
description |
16 pages, 7 figures, 4 tables. Carbon species fluxes and net budgets were studied with a 2-D box model in the Ría de Arousa (Spain), a large indentation in the NW Iberian upwelling system. The embayment acted as a CO2 source to the atmosphere during the upwelling season (average CO2 flux across the seawater-air interface, FCO2 = +16 mg C m-2 d-1), despite the elevated net community production (NCP) rates (average NCP = 0.84 g C m-2 d-1). The high pCO2 levels in source Eastern North Atlantic Central Water (ENACW) and the reduced residence times within the Ría (~6 d) seem to be the reasons for the observed FCO2. The CO2 increase associated with CaCO3 fixation by the intensive culture of mussels on hanging ropes did not affect FCO2 significantly. High FCO2 values were observed during strong upwelling, which was 3 times larger than the average during the upwelling season. Under these conditions the CO2-rich source ENACW reached the surface and this coincided with low phytoplankton production (NCP = -0.01 g C m-2 d-1). Source ENACW was enriched within the Ría with carbon released from the sediments. FCO2 was reduced to 1/3 of its value compared to the average upwelling season under conditions of moderate upwelling. Phytoplankton grew rapidly (average NCP = 1.49 g C m-2 d-1) at the expense of the gentle injection of new nutrients at the base of the pycnocline. Negligible FCO2 values were observed during upwelling relaxations, when ENACW into the Ría was replaced by the warm and CO2-equilibrated shelf surface waters. FCO2 reached a maximum during a strong autumn downwelling event because of the concurrence of warm shelf surface water flow into the Ría with strong carbon release from the sediments. CO2 fluxes per unit area always increased coastwards, because of the progressive CO2 enrichment of the source ENACW as it enters the embayment and the decrease of residence times. Support for this work came from C.I.C.Y.T grant number MAR88- 0245 and funds from the Conselleria de Pesca da Xunta de Galicia. Fellowships ... |
format |
Article in Journal/Newspaper |
author |
Rosón, Gabriel Álvarez-Salgado, Xosé Antón Pérez, Fiz F. |
author_facet |
Rosón, Gabriel Álvarez-Salgado, Xosé Antón Pérez, Fiz F. |
author_sort |
Rosón, Gabriel |
title |
Carbon cycling in a large coastal embayment, affected by wind-driven upwelling: short-time-scale variability and spatial differences |
title_short |
Carbon cycling in a large coastal embayment, affected by wind-driven upwelling: short-time-scale variability and spatial differences |
title_full |
Carbon cycling in a large coastal embayment, affected by wind-driven upwelling: short-time-scale variability and spatial differences |
title_fullStr |
Carbon cycling in a large coastal embayment, affected by wind-driven upwelling: short-time-scale variability and spatial differences |
title_full_unstemmed |
Carbon cycling in a large coastal embayment, affected by wind-driven upwelling: short-time-scale variability and spatial differences |
title_sort |
carbon cycling in a large coastal embayment, affected by wind-driven upwelling: short-time-scale variability and spatial differences |
publisher |
Inter Research |
publishDate |
1999 |
url |
http://hdl.handle.net/10261/25326 https://doi.org/10.3354/meps176215 |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_relation |
http://dx.doi.org/10.3354/meps176215 Marine Ecology Progress Series 176: 215-230 (1999) 0171-8630 http://hdl.handle.net/10261/25326 doi:10.3354/meps176215 |
op_rights |
open |
op_doi |
https://doi.org/10.3354/meps176215 |
container_title |
Marine Ecology Progress Series |
container_volume |
176 |
container_start_page |
215 |
op_container_end_page |
230 |
_version_ |
1790604818332516352 |