Variability of the transport of anthropogenic CO2 at the Greenland-Portugal OVIDE section:Controlling mechanisms
The interannual to decadal variability in the transport of anthropogenic CO2 (Cant) across the subpolar North Atlantic (SPNA) is investigated, using summer data of the FOUREX and OVIDE high-resolution transoceanic sections, from Greenland to Portugal, occupied six times from 1997 to 2010. The transp...
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2014
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Online Access: | https://ueaeprints.uea.ac.uk/id/eprint/77098/ https://ueaeprints.uea.ac.uk/id/eprint/77098/1/Published_Version.pdf https://doi.org/10.5194/bg-11-2375-2014 |
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ftuniveastangl:oai:ueaeprints.uea.ac.uk:77098 2023-06-06T11:54:21+02:00 Variability of the transport of anthropogenic CO2 at the Greenland-Portugal OVIDE section:Controlling mechanisms Zunino, P. Garcia-Ibañez, M. I. Lherminier, P. Mercier, H. Rios, A. F. Pérez, F. F. 2014-04-29 application/pdf https://ueaeprints.uea.ac.uk/id/eprint/77098/ https://ueaeprints.uea.ac.uk/id/eprint/77098/1/Published_Version.pdf https://doi.org/10.5194/bg-11-2375-2014 en eng https://ueaeprints.uea.ac.uk/id/eprint/77098/1/Published_Version.pdf Zunino, P., Garcia-Ibañez, M. I., Lherminier, P., Mercier, H., Rios, A. F. and Pérez, F. F. (2014) Variability of the transport of anthropogenic CO2 at the Greenland-Portugal OVIDE section:Controlling mechanisms. Biogeosciences, 11 (8). pp. 2375-2389. ISSN 1726-4170 doi:10.5194/bg-11-2375-2014 cc_by Article PeerReviewed 2014 ftuniveastangl https://doi.org/10.5194/bg-11-2375-2014 2023-04-13T22:32:14Z The interannual to decadal variability in the transport of anthropogenic CO2 (Cant) across the subpolar North Atlantic (SPNA) is investigated, using summer data of the FOUREX and OVIDE high-resolution transoceanic sections, from Greenland to Portugal, occupied six times from 1997 to 2010. The transport of Cant across this section, Tcant hereafter, is northward, with a mean value of 254 ± 29 kmol s-1 over the 1997-2010 period. We find that Tcant undergoes interannual variability, masking any trend different from 0 for this period. In order to understand the mechanisms controlling the variability of Tcant across the SPNA, we propose a new method that quantifies the transport of Cant caused by the diapycnal and isopycnal circulation. The diapycnal component yields a large northward transport of Cant (400 ± 29 kmol s-1) that is partially compensated by a southward transport of Cant caused by the isopycnal component (-171 ± 11 kmol s-1), mainly localized in the Irminger Sea. Most importantly, the diapycnal component is found to be the main driver of the variability of Tcant across the SPNA. Both the Meridional Overturning Circulation (computed in density coordinates, MOCσ) and the Cant increase in the water column have an important effect on the variability of the diapycnal component and of Tcant itself. Based on this analysis, we propose a simplified estimator for the variability of T cant based on the intensity of the MOCσ and on the difference of Cant between the upper and lower limb of the MOCσ (ΔCant). This estimator shows a good consistency with the diapycnal component of T cant, and help to disentangle the effect of the variability of both the circulation and the Cant increase on the Tcant variability. We find that ΔCant keeps increasing over the past decade, and it is very likely that the continuous Cant increase in the water masses will cause an increase in Tcant across the SPNA at long timescale. Nevertheless, at the timescale analyzed here (1997-2010), the MOCσ controls the T cant variability, blurring any ... Article in Journal/Newspaper Greenland North Atlantic University of East Anglia: UEA Digital Repository Greenland Irminger Sea ENVELOPE(-34.041,-34.041,63.054,63.054) Biogeosciences 11 8 2375 2389 |
institution |
Open Polar |
collection |
University of East Anglia: UEA Digital Repository |
op_collection_id |
ftuniveastangl |
language |
English |
description |
The interannual to decadal variability in the transport of anthropogenic CO2 (Cant) across the subpolar North Atlantic (SPNA) is investigated, using summer data of the FOUREX and OVIDE high-resolution transoceanic sections, from Greenland to Portugal, occupied six times from 1997 to 2010. The transport of Cant across this section, Tcant hereafter, is northward, with a mean value of 254 ± 29 kmol s-1 over the 1997-2010 period. We find that Tcant undergoes interannual variability, masking any trend different from 0 for this period. In order to understand the mechanisms controlling the variability of Tcant across the SPNA, we propose a new method that quantifies the transport of Cant caused by the diapycnal and isopycnal circulation. The diapycnal component yields a large northward transport of Cant (400 ± 29 kmol s-1) that is partially compensated by a southward transport of Cant caused by the isopycnal component (-171 ± 11 kmol s-1), mainly localized in the Irminger Sea. Most importantly, the diapycnal component is found to be the main driver of the variability of Tcant across the SPNA. Both the Meridional Overturning Circulation (computed in density coordinates, MOCσ) and the Cant increase in the water column have an important effect on the variability of the diapycnal component and of Tcant itself. Based on this analysis, we propose a simplified estimator for the variability of T cant based on the intensity of the MOCσ and on the difference of Cant between the upper and lower limb of the MOCσ (ΔCant). This estimator shows a good consistency with the diapycnal component of T cant, and help to disentangle the effect of the variability of both the circulation and the Cant increase on the Tcant variability. We find that ΔCant keeps increasing over the past decade, and it is very likely that the continuous Cant increase in the water masses will cause an increase in Tcant across the SPNA at long timescale. Nevertheless, at the timescale analyzed here (1997-2010), the MOCσ controls the T cant variability, blurring any ... |
format |
Article in Journal/Newspaper |
author |
Zunino, P. Garcia-Ibañez, M. I. Lherminier, P. Mercier, H. Rios, A. F. Pérez, F. F. |
spellingShingle |
Zunino, P. Garcia-Ibañez, M. I. Lherminier, P. Mercier, H. Rios, A. F. Pérez, F. F. Variability of the transport of anthropogenic CO2 at the Greenland-Portugal OVIDE section:Controlling mechanisms |
author_facet |
Zunino, P. Garcia-Ibañez, M. I. Lherminier, P. Mercier, H. Rios, A. F. Pérez, F. F. |
author_sort |
Zunino, P. |
title |
Variability of the transport of anthropogenic CO2 at the Greenland-Portugal OVIDE section:Controlling mechanisms |
title_short |
Variability of the transport of anthropogenic CO2 at the Greenland-Portugal OVIDE section:Controlling mechanisms |
title_full |
Variability of the transport of anthropogenic CO2 at the Greenland-Portugal OVIDE section:Controlling mechanisms |
title_fullStr |
Variability of the transport of anthropogenic CO2 at the Greenland-Portugal OVIDE section:Controlling mechanisms |
title_full_unstemmed |
Variability of the transport of anthropogenic CO2 at the Greenland-Portugal OVIDE section:Controlling mechanisms |
title_sort |
variability of the transport of anthropogenic co2 at the greenland-portugal ovide section:controlling mechanisms |
publishDate |
2014 |
url |
https://ueaeprints.uea.ac.uk/id/eprint/77098/ https://ueaeprints.uea.ac.uk/id/eprint/77098/1/Published_Version.pdf https://doi.org/10.5194/bg-11-2375-2014 |
long_lat |
ENVELOPE(-34.041,-34.041,63.054,63.054) |
geographic |
Greenland Irminger Sea |
geographic_facet |
Greenland Irminger Sea |
genre |
Greenland North Atlantic |
genre_facet |
Greenland North Atlantic |
op_relation |
https://ueaeprints.uea.ac.uk/id/eprint/77098/1/Published_Version.pdf Zunino, P., Garcia-Ibañez, M. I., Lherminier, P., Mercier, H., Rios, A. F. and Pérez, F. F. (2014) Variability of the transport of anthropogenic CO2 at the Greenland-Portugal OVIDE section:Controlling mechanisms. Biogeosciences, 11 (8). pp. 2375-2389. ISSN 1726-4170 doi:10.5194/bg-11-2375-2014 |
op_rights |
cc_by |
op_doi |
https://doi.org/10.5194/bg-11-2375-2014 |
container_title |
Biogeosciences |
container_volume |
11 |
container_issue |
8 |
container_start_page |
2375 |
op_container_end_page |
2389 |
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1767960817190305792 |