Inter-annual variability of the carbon dioxide oceanic sink south of Tasmania
We compiled a large data-set from 22 cruises spanning from 1991 to 2003, of the partial pressure of CO 2 (pCO 2 ) in surface waters over the continental shelf (CS) and adjacent open ocean (43° to 46° S; 145° to 150° E), south of Tasmania. Climatological seasonal cycles of pCO 2 in the CS, the subtro...
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ftdoajarticles:oai:doaj.org/article:44d51859fa4a4936baf1049bbec93c8f 2023-05-15T18:25:44+02:00 Inter-annual variability of the carbon dioxide oceanic sink south of Tasmania A. V. Borges B. Tilbrook N. Metzl A. Lenton B. Delille 2008-02-01T00:00:00Z https://doaj.org/article/44d51859fa4a4936baf1049bbec93c8f EN eng Copernicus Publications http://www.biogeosciences.net/5/141/2008/bg-5-141-2008.pdf https://doaj.org/toc/1726-4170 https://doaj.org/toc/1726-4189 1726-4170 1726-4189 https://doaj.org/article/44d51859fa4a4936baf1049bbec93c8f Biogeosciences, Vol 5, Iss 1, Pp 141-155 (2008) Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 article 2008 ftdoajarticles 2022-12-31T13:49:24Z We compiled a large data-set from 22 cruises spanning from 1991 to 2003, of the partial pressure of CO 2 (pCO 2 ) in surface waters over the continental shelf (CS) and adjacent open ocean (43° to 46° S; 145° to 150° 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°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 CO 2 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 CO 2 . Article in Journal/Newspaper Southern Ocean Directory of Open Access Journals: DOAJ Articles Southern Ocean |
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Directory of Open Access Journals: DOAJ Articles |
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language |
English |
topic |
Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 |
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Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 A. V. Borges B. Tilbrook N. Metzl A. Lenton B. Delille Inter-annual variability of the carbon dioxide oceanic sink south of Tasmania |
topic_facet |
Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 |
description |
We compiled a large data-set from 22 cruises spanning from 1991 to 2003, of the partial pressure of CO 2 (pCO 2 ) in surface waters over the continental shelf (CS) and adjacent open ocean (43° to 46° S; 145° to 150° 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°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 CO 2 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 CO 2 . |
format |
Article in Journal/Newspaper |
author |
A. V. Borges B. Tilbrook N. Metzl A. Lenton B. Delille |
author_facet |
A. V. Borges B. Tilbrook N. Metzl A. Lenton B. Delille |
author_sort |
A. V. Borges |
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 |
Copernicus Publications |
publishDate |
2008 |
url |
https://doaj.org/article/44d51859fa4a4936baf1049bbec93c8f |
geographic |
Southern Ocean |
geographic_facet |
Southern Ocean |
genre |
Southern Ocean |
genre_facet |
Southern Ocean |
op_source |
Biogeosciences, Vol 5, Iss 1, Pp 141-155 (2008) |
op_relation |
http://www.biogeosciences.net/5/141/2008/bg-5-141-2008.pdf https://doaj.org/toc/1726-4170 https://doaj.org/toc/1726-4189 1726-4170 1726-4189 https://doaj.org/article/44d51859fa4a4936baf1049bbec93c8f |
_version_ |
1766207369225699328 |