Ocean acidification in the subpolar North Atlantic: rates and mechanisms controlling pH changes
Repeated hydrographic sections provide critically needed data on and understanding of changes in basin-wide ocean CO 2 chemistry over multi-decadal timescales. Here, high-quality measurements collected at twelve cruises carried out along the same track between 1991 and 2015 have been used to determi...
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Online Access: | https://doi.org/10.5194/bg-13-3701-2016 https://www.biogeosciences.net/13/3701/2016/ |
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ftcopernicus:oai:publications.copernicus.org:bg50036 2023-05-15T16:48:31+02:00 Ocean acidification in the subpolar North Atlantic: rates and mechanisms controlling pH changes García-Ibáñez, Maribel I. Zunino, Patricia Fröb, Friederike Carracedo, Lidia I. Ríos, Aida F. Mercier, Herlé Olsen, Are Pérez, Fiz F. 2018-09-27 application/pdf https://doi.org/10.5194/bg-13-3701-2016 https://www.biogeosciences.net/13/3701/2016/ eng eng doi:10.5194/bg-13-3701-2016 https://www.biogeosciences.net/13/3701/2016/ eISSN: 1726-4189 Text 2018 ftcopernicus https://doi.org/10.5194/bg-13-3701-2016 2019-12-24T09:52:12Z Repeated hydrographic sections provide critically needed data on and understanding of changes in basin-wide ocean CO 2 chemistry over multi-decadal timescales. Here, high-quality measurements collected at twelve cruises carried out along the same track between 1991 and 2015 have been used to determine long-term changes in ocean CO 2 chemistry and ocean acidification in the Irminger and Iceland basins of the North Atlantic Ocean. Trends were determined for each of the main water masses present and are discussed in the context of the basin-wide circulation. The pH has decreased in all water masses of the Irminger and Iceland basins over the past 25 years with the greatest changes in surface and intermediate waters (between −0.0010 ± 0.0001 and −0.0018 ± 0.0001 pH units yr −1 ). In order to disentangle the drivers of the pH changes, we decomposed the trends into their principal drivers: changes in temperature, salinity, total alkalinity ( A T ) and total dissolved inorganic carbon (both its natural and anthropogenic components). The increase in anthropogenic CO 2 ( C ant ) was identified as the main agent of the pH decline, partially offset by A T increases. The acidification of intermediate waters caused by C ant uptake has been reinforced by the aging of the water masses over the period of our analysis. The pH decrease of the deep overflow waters in the Irminger basin was similar to that observed in the upper ocean and was mainly linked to the C ant increase, thus reflecting the recent contact of these deep waters with the atmosphere. Text Iceland North Atlantic Ocean acidification Copernicus Publications: E-Journals Irminger Basin ENVELOPE(-36.000,-36.000,61.000,61.000) Biogeosciences 13 12 3701 3715 |
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Open Polar |
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Copernicus Publications: E-Journals |
op_collection_id |
ftcopernicus |
language |
English |
description |
Repeated hydrographic sections provide critically needed data on and understanding of changes in basin-wide ocean CO 2 chemistry over multi-decadal timescales. Here, high-quality measurements collected at twelve cruises carried out along the same track between 1991 and 2015 have been used to determine long-term changes in ocean CO 2 chemistry and ocean acidification in the Irminger and Iceland basins of the North Atlantic Ocean. Trends were determined for each of the main water masses present and are discussed in the context of the basin-wide circulation. The pH has decreased in all water masses of the Irminger and Iceland basins over the past 25 years with the greatest changes in surface and intermediate waters (between −0.0010 ± 0.0001 and −0.0018 ± 0.0001 pH units yr −1 ). In order to disentangle the drivers of the pH changes, we decomposed the trends into their principal drivers: changes in temperature, salinity, total alkalinity ( A T ) and total dissolved inorganic carbon (both its natural and anthropogenic components). The increase in anthropogenic CO 2 ( C ant ) was identified as the main agent of the pH decline, partially offset by A T increases. The acidification of intermediate waters caused by C ant uptake has been reinforced by the aging of the water masses over the period of our analysis. The pH decrease of the deep overflow waters in the Irminger basin was similar to that observed in the upper ocean and was mainly linked to the C ant increase, thus reflecting the recent contact of these deep waters with the atmosphere. |
format |
Text |
author |
García-Ibáñez, Maribel I. Zunino, Patricia Fröb, Friederike Carracedo, Lidia I. Ríos, Aida F. Mercier, Herlé Olsen, Are Pérez, Fiz F. |
spellingShingle |
García-Ibáñez, Maribel I. Zunino, Patricia Fröb, Friederike Carracedo, Lidia I. Ríos, Aida F. Mercier, Herlé Olsen, Are Pérez, Fiz F. Ocean acidification in the subpolar North Atlantic: rates and mechanisms controlling pH changes |
author_facet |
García-Ibáñez, Maribel I. Zunino, Patricia Fröb, Friederike Carracedo, Lidia I. Ríos, Aida F. Mercier, Herlé Olsen, Are Pérez, Fiz F. |
author_sort |
García-Ibáñez, Maribel I. |
title |
Ocean acidification in the subpolar North Atlantic: rates and mechanisms controlling pH changes |
title_short |
Ocean acidification in the subpolar North Atlantic: rates and mechanisms controlling pH changes |
title_full |
Ocean acidification in the subpolar North Atlantic: rates and mechanisms controlling pH changes |
title_fullStr |
Ocean acidification in the subpolar North Atlantic: rates and mechanisms controlling pH changes |
title_full_unstemmed |
Ocean acidification in the subpolar North Atlantic: rates and mechanisms controlling pH changes |
title_sort |
ocean acidification in the subpolar north atlantic: rates and mechanisms controlling ph changes |
publishDate |
2018 |
url |
https://doi.org/10.5194/bg-13-3701-2016 https://www.biogeosciences.net/13/3701/2016/ |
long_lat |
ENVELOPE(-36.000,-36.000,61.000,61.000) |
geographic |
Irminger Basin |
geographic_facet |
Irminger Basin |
genre |
Iceland North Atlantic Ocean acidification |
genre_facet |
Iceland North Atlantic Ocean acidification |
op_source |
eISSN: 1726-4189 |
op_relation |
doi:10.5194/bg-13-3701-2016 https://www.biogeosciences.net/13/3701/2016/ |
op_doi |
https://doi.org/10.5194/bg-13-3701-2016 |
container_title |
Biogeosciences |
container_volume |
13 |
container_issue |
12 |
container_start_page |
3701 |
op_container_end_page |
3715 |
_version_ |
1766038595659890688 |