Trends of anthropogenic CO 2 storage in North Atlantic water masses
A high-quality inorganic carbon system database, spanning over three decades (1981–2006) and comprising of 13 cruises, has allowed the applying of the ϕ C° T method and coming up with estimates of the anthropogenic CO 2 ( C ant ) stored in the main water masses of the North Atlantic. In the studied...
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ftdoajarticles:oai:doaj.org/article:c57a86158bdf4138b5eddd0c5d027765 2023-05-15T16:52:44+02:00 Trends of anthropogenic CO 2 storage in North Atlantic water masses P. Lherminier A. Velo H. Mercier M. Vázquez-Rodríguez F. F. Pérez A. F. Ríos 2010-05-01T00:00:00Z https://doi.org/10.5194/bg-7-1789-2010 https://doaj.org/article/c57a86158bdf4138b5eddd0c5d027765 EN eng Copernicus Publications http://www.biogeosciences.net/7/1789/2010/bg-7-1789-2010.pdf https://doaj.org/toc/1726-4170 https://doaj.org/toc/1726-4189 doi:10.5194/bg-7-1789-2010 1726-4170 1726-4189 https://doaj.org/article/c57a86158bdf4138b5eddd0c5d027765 Biogeosciences, Vol 7, Iss 5, Pp 1789-1807 (2010) Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 article 2010 ftdoajarticles https://doi.org/10.5194/bg-7-1789-2010 2022-12-30T21:39:37Z A high-quality inorganic carbon system database, spanning over three decades (1981–2006) and comprising of 13 cruises, has allowed the applying of the ϕ C° T method and coming up with estimates of the anthropogenic CO 2 ( C ant ) stored in the main water masses of the North Atlantic. In the studied region, strong convective processes convey surface properties, like C ant , into deeper ocean layers and grants this region an added oceanographic interest from the point of view of air-sea CO 2 exchanges. Generally, a tendency for decreasing C ant storage rates towards the deep layers has been observed. In the Iberian Basin, the North Atlantic Deep Water has low C ant concentrations and negligible storage rates, while the North Atlantic Central Water in the upper layers shows the largest C ant values and the largest annual increase of its average concentration (1.13 ± 0.14 μmol kg −1 yr −1 ). This unmatched rate of change in the C ant concentration of the warm upper limb of the Meridional Overturning Circulation decreases towards the Irminger basin (0.68 ± 0.06 μmol kg −1 yr −1 ) due to the lowering of the buffering capacity. The mid and deep waters in the Irminger Sea show rather similar C ant concentration rates of increase (between 0.33 and 0.45 μmol kg −1 yr −1 ), whereas in the Iceland basin these layers seem to have been less affected by C ant . Overall, the C ant storage rates in the North Atlantic subpolar gyre during the first half of the 1990s, when a high North Atlantic Oscillation (NAO) phase was dominant, are ~48% higher than during the 1997–2006 low NAO phase that followed. This result suggests that a net decrease in the strength of the North Atlantic sink of atmospheric CO 2 has taken place during the present decade. The changes in deep-water ventilation are the main driving processes causing this weakening of the North Atlantic CO 2 sink. Article in Journal/Newspaper Iceland North Atlantic Deep Water North Atlantic North Atlantic oscillation Directory of Open Access Journals: DOAJ Articles Irminger Basin ENVELOPE(-36.000,-36.000,61.000,61.000) Irminger Sea ENVELOPE(-34.041,-34.041,63.054,63.054) Biogeosciences 7 5 1789 1807 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 |
spellingShingle |
Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 P. Lherminier A. Velo H. Mercier M. Vázquez-Rodríguez F. F. Pérez A. F. Ríos Trends of anthropogenic CO 2 storage in North Atlantic water masses |
topic_facet |
Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 |
description |
A high-quality inorganic carbon system database, spanning over three decades (1981–2006) and comprising of 13 cruises, has allowed the applying of the ϕ C° T method and coming up with estimates of the anthropogenic CO 2 ( C ant ) stored in the main water masses of the North Atlantic. In the studied region, strong convective processes convey surface properties, like C ant , into deeper ocean layers and grants this region an added oceanographic interest from the point of view of air-sea CO 2 exchanges. Generally, a tendency for decreasing C ant storage rates towards the deep layers has been observed. In the Iberian Basin, the North Atlantic Deep Water has low C ant concentrations and negligible storage rates, while the North Atlantic Central Water in the upper layers shows the largest C ant values and the largest annual increase of its average concentration (1.13 ± 0.14 μmol kg −1 yr −1 ). This unmatched rate of change in the C ant concentration of the warm upper limb of the Meridional Overturning Circulation decreases towards the Irminger basin (0.68 ± 0.06 μmol kg −1 yr −1 ) due to the lowering of the buffering capacity. The mid and deep waters in the Irminger Sea show rather similar C ant concentration rates of increase (between 0.33 and 0.45 μmol kg −1 yr −1 ), whereas in the Iceland basin these layers seem to have been less affected by C ant . Overall, the C ant storage rates in the North Atlantic subpolar gyre during the first half of the 1990s, when a high North Atlantic Oscillation (NAO) phase was dominant, are ~48% higher than during the 1997–2006 low NAO phase that followed. This result suggests that a net decrease in the strength of the North Atlantic sink of atmospheric CO 2 has taken place during the present decade. The changes in deep-water ventilation are the main driving processes causing this weakening of the North Atlantic CO 2 sink. |
format |
Article in Journal/Newspaper |
author |
P. Lherminier A. Velo H. Mercier M. Vázquez-Rodríguez F. F. Pérez A. F. Ríos |
author_facet |
P. Lherminier A. Velo H. Mercier M. Vázquez-Rodríguez F. F. Pérez A. F. Ríos |
author_sort |
P. Lherminier |
title |
Trends of anthropogenic CO 2 storage in North Atlantic water masses |
title_short |
Trends of anthropogenic CO 2 storage in North Atlantic water masses |
title_full |
Trends of anthropogenic CO 2 storage in North Atlantic water masses |
title_fullStr |
Trends of anthropogenic CO 2 storage in North Atlantic water masses |
title_full_unstemmed |
Trends of anthropogenic CO 2 storage in North Atlantic water masses |
title_sort |
trends of anthropogenic co 2 storage in north atlantic water masses |
publisher |
Copernicus Publications |
publishDate |
2010 |
url |
https://doi.org/10.5194/bg-7-1789-2010 https://doaj.org/article/c57a86158bdf4138b5eddd0c5d027765 |
long_lat |
ENVELOPE(-36.000,-36.000,61.000,61.000) ENVELOPE(-34.041,-34.041,63.054,63.054) |
geographic |
Irminger Basin Irminger Sea |
geographic_facet |
Irminger Basin Irminger Sea |
genre |
Iceland North Atlantic Deep Water North Atlantic North Atlantic oscillation |
genre_facet |
Iceland North Atlantic Deep Water North Atlantic North Atlantic oscillation |
op_source |
Biogeosciences, Vol 7, Iss 5, Pp 1789-1807 (2010) |
op_relation |
http://www.biogeosciences.net/7/1789/2010/bg-7-1789-2010.pdf https://doaj.org/toc/1726-4170 https://doaj.org/toc/1726-4189 doi:10.5194/bg-7-1789-2010 1726-4170 1726-4189 https://doaj.org/article/c57a86158bdf4138b5eddd0c5d027765 |
op_doi |
https://doi.org/10.5194/bg-7-1789-2010 |
container_title |
Biogeosciences |
container_volume |
7 |
container_issue |
5 |
container_start_page |
1789 |
op_container_end_page |
1807 |
_version_ |
1766043106374844416 |