Inter-annual variability of the carbon dioxide oceanic sink south of Tasmania
peer reviewed We compiled a large data-set from 22 cruises spanning from 1991 to 2003, of the partial pressure of CO2 (pCO(2)) in surface waters over the continental shelf (CS) and adjacent open ocean (43 degrees to 46 degrees S; 145 degrees to 150 degrees E), south of Tasmania. Climatological seaso...
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European Geosciences Union
2008
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Online Access: | https://orbi.uliege.be/handle/2268/2149 https://orbi.uliege.be/bitstream/2268/2149/1/Borges%20et%20al%202008.pdf https://doi.org/10.5194/bg-5-141-2008 |
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ftorbi:oai:orbi.ulg.ac.be:2268/2149 2024-10-13T14:10:56+00:00 Inter-annual variability of the carbon dioxide oceanic sink south of Tasmania Borges, Alberto Tilbrook, B. Metzl, N. Lenton, A. Delille, Bruno 2008 https://orbi.uliege.be/handle/2268/2149 https://orbi.uliege.be/bitstream/2268/2149/1/Borges%20et%20al%202008.pdf https://doi.org/10.5194/bg-5-141-2008 en eng European Geosciences Union http://www.biogeosciences.net/5/141/2008/bg-5-141-2008.html urn:issn:1726-4170 urn:issn:1726-4189 https://orbi.uliege.be/handle/2268/2149 info:hdl:2268/2149 https://orbi.uliege.be/bitstream/2268/2149/1/Borges%20et%20al%202008.pdf open access http://purl.org/coar/access_right/c_abf2 info:eu-repo/semantics/openAccess Biogeosciences, 5 (1), 141-155 (2008) Physical chemical mathematical & earth Sciences Earth sciences & physical geography Physique chimie mathématiques & sciences de la terre Sciences de la terre & géographie physique journal article http://purl.org/coar/resource_type/c_6501 info:eu-repo/semantics/article peer reviewed 2008 ftorbi https://doi.org/10.5194/bg-5-141-2008 2024-09-27T07:01:35Z peer reviewed We compiled a large data-set from 22 cruises spanning from 1991 to 2003, of the partial pressure of CO2 (pCO(2)) in surface waters over the continental shelf (CS) and adjacent open ocean (43 degrees to 46 degrees S; 145 degrees to 150 degrees E), south of Tasmania. Climatological seasonal cycles of pCO(2) in the CS, the subtropical zone (STZ) and the subAntarctic zone (SAZ) are described and used to determine monthly pCO(2) anomalies. These are used in combination with monthly anomalies of sea surface temperature (SST) to investigate inter-annual variations of SST and pCO(2). Monthly anomalies of SST (as intense as 2 degrees C) are apparent in the CS, STZ and SAZ, and are indicative of strong inter-annual variability that seems to be related to large-scale coupled atmosphere-ocean oscillations. Anomalies of pCO(2) normalized to a constant temperature are negatively related to SST anomalies. A reduced winter-time vertical input of dissolved inorganic carbon (DIC) during phases of positive SST anomalies, related to a poleward shift of westerly winds, and a concomitant local decrease in wind stress is the likely cause of the negative relationship between pCO(2) and SST anomalies. The observed pattern is an increase of the sink for atmospheric CO2 associated with positive SST anomalies, although strongly modulated by inter-annual variability of wind speed. Assuming that phases of positive SST anomalies are indicative of the future evolution of regional ocean biogeochemistry under global warming, we show using a purely observational based approach that some provinces of the Southern Ocean could provide a potential negative feedback on increasing atmospheric CO2. BELCANTO Article in Journal/Newspaper Southern Ocean University of Liège: ORBi (Open Repository and Bibliography) Southern Ocean Biogeosciences 5 1 141 155 |
institution |
Open Polar |
collection |
University of Liège: ORBi (Open Repository and Bibliography) |
op_collection_id |
ftorbi |
language |
English |
topic |
Physical chemical mathematical & earth Sciences Earth sciences & physical geography Physique chimie mathématiques & sciences de la terre Sciences de la terre & géographie physique |
spellingShingle |
Physical chemical mathematical & earth Sciences Earth sciences & physical geography Physique chimie mathématiques & sciences de la terre Sciences de la terre & géographie physique Borges, Alberto Tilbrook, B. Metzl, N. Lenton, A. Delille, Bruno Inter-annual variability of the carbon dioxide oceanic sink south of Tasmania |
topic_facet |
Physical chemical mathematical & earth Sciences Earth sciences & physical geography Physique chimie mathématiques & sciences de la terre Sciences de la terre & géographie physique |
description |
peer reviewed We compiled a large data-set from 22 cruises spanning from 1991 to 2003, of the partial pressure of CO2 (pCO(2)) in surface waters over the continental shelf (CS) and adjacent open ocean (43 degrees to 46 degrees S; 145 degrees to 150 degrees E), south of Tasmania. Climatological seasonal cycles of pCO(2) in the CS, the subtropical zone (STZ) and the subAntarctic zone (SAZ) are described and used to determine monthly pCO(2) anomalies. These are used in combination with monthly anomalies of sea surface temperature (SST) to investigate inter-annual variations of SST and pCO(2). Monthly anomalies of SST (as intense as 2 degrees C) are apparent in the CS, STZ and SAZ, and are indicative of strong inter-annual variability that seems to be related to large-scale coupled atmosphere-ocean oscillations. Anomalies of pCO(2) normalized to a constant temperature are negatively related to SST anomalies. A reduced winter-time vertical input of dissolved inorganic carbon (DIC) during phases of positive SST anomalies, related to a poleward shift of westerly winds, and a concomitant local decrease in wind stress is the likely cause of the negative relationship between pCO(2) and SST anomalies. The observed pattern is an increase of the sink for atmospheric CO2 associated with positive SST anomalies, although strongly modulated by inter-annual variability of wind speed. Assuming that phases of positive SST anomalies are indicative of the future evolution of regional ocean biogeochemistry under global warming, we show using a purely observational based approach that some provinces of the Southern Ocean could provide a potential negative feedback on increasing atmospheric CO2. BELCANTO |
format |
Article in Journal/Newspaper |
author |
Borges, Alberto Tilbrook, B. Metzl, N. Lenton, A. Delille, Bruno |
author_facet |
Borges, Alberto Tilbrook, B. Metzl, N. Lenton, A. Delille, Bruno |
author_sort |
Borges, Alberto |
title |
Inter-annual variability of the carbon dioxide oceanic sink south of Tasmania |
title_short |
Inter-annual variability of the carbon dioxide oceanic sink south of Tasmania |
title_full |
Inter-annual variability of the carbon dioxide oceanic sink south of Tasmania |
title_fullStr |
Inter-annual variability of the carbon dioxide oceanic sink south of Tasmania |
title_full_unstemmed |
Inter-annual variability of the carbon dioxide oceanic sink south of Tasmania |
title_sort |
inter-annual variability of the carbon dioxide oceanic sink south of tasmania |
publisher |
European Geosciences Union |
publishDate |
2008 |
url |
https://orbi.uliege.be/handle/2268/2149 https://orbi.uliege.be/bitstream/2268/2149/1/Borges%20et%20al%202008.pdf https://doi.org/10.5194/bg-5-141-2008 |
geographic |
Southern Ocean |
geographic_facet |
Southern Ocean |
genre |
Southern Ocean |
genre_facet |
Southern Ocean |
op_source |
Biogeosciences, 5 (1), 141-155 (2008) |
op_relation |
http://www.biogeosciences.net/5/141/2008/bg-5-141-2008.html urn:issn:1726-4170 urn:issn:1726-4189 https://orbi.uliege.be/handle/2268/2149 info:hdl:2268/2149 https://orbi.uliege.be/bitstream/2268/2149/1/Borges%20et%20al%202008.pdf |
op_rights |
open access http://purl.org/coar/access_right/c_abf2 info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.5194/bg-5-141-2008 |
container_title |
Biogeosciences |
container_volume |
5 |
container_issue |
1 |
container_start_page |
141 |
op_container_end_page |
155 |
_version_ |
1812818498623111168 |