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 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...
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fttriple:oai:gotriple.eu:10670/1.kruf9v 2023-05-15T18:25:48+02:00 Inter-annual variability of the carbon dioxide oceanic sink south of Tasmania Borges, A. V. Tilbrook, B. Metzl, N. Lenton, A. Delille, B. 2008-01-01 https://doi.org/10.5194/bg-5-141-2008 https://archimer.ifremer.fr/doc/00238/34889/33141.pdf https://archimer.ifremer.fr/doc/00238/34889/ en eng Copernicus Publications doi:10.5194/bg-5-141-2008 10670/1.kruf9v https://archimer.ifremer.fr/doc/00238/34889/33141.pdf https://archimer.ifremer.fr/doc/00238/34889/ lic_creative-commons other Archimer, archive institutionnelle de l'Ifremer Biogeosciences (1726-4170) (Copernicus Publications), 2008 , Vol. 5 , N. 1 , P. 141-155 envir geo Text https://vocabularies.coar-repositories.org/resource_types/c_18cf/ 2008 fttriple https://doi.org/10.5194/bg-5-141-2008 2023-01-22T18:41:20Z 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. Text Southern Ocean Unknown Southern Ocean Biogeosciences 5 1 141 155 |
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English |
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envir geo |
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envir geo Borges, A. V. Tilbrook, B. Metzl, N. Lenton, A. Delille, B. Inter-annual variability of the carbon dioxide oceanic sink south of Tasmania |
topic_facet |
envir geo |
description |
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. |
format |
Text |
author |
Borges, A. V. Tilbrook, B. Metzl, N. Lenton, A. Delille, B. |
author_facet |
Borges, A. V. Tilbrook, B. Metzl, N. Lenton, A. Delille, B. |
author_sort |
Borges, A. V. |
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://doi.org/10.5194/bg-5-141-2008 https://archimer.ifremer.fr/doc/00238/34889/33141.pdf https://archimer.ifremer.fr/doc/00238/34889/ |
geographic |
Southern Ocean |
geographic_facet |
Southern Ocean |
genre |
Southern Ocean |
genre_facet |
Southern Ocean |
op_source |
Archimer, archive institutionnelle de l'Ifremer Biogeosciences (1726-4170) (Copernicus Publications), 2008 , Vol. 5 , N. 1 , P. 141-155 |
op_relation |
doi:10.5194/bg-5-141-2008 10670/1.kruf9v https://archimer.ifremer.fr/doc/00238/34889/33141.pdf https://archimer.ifremer.fr/doc/00238/34889/ |
op_rights |
lic_creative-commons other |
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 |
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1766207467928158208 |