Acidification and transports of water masses and CO2 in the North Atlantic
The rise in the atmospheric CO2 levels due to human activities (CANT) is softened by its oceanic uptake. But this absorption leads to a suite of chemical changes collectively known as ocean acidification. Although acidification occurs in the world ocean, its impacts tend to be stronger in the high l...
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Programa de Doutoramento en Ciencias Mariñas, Tecnoloxía e Xestión (RD 99/2011)
2015
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ftunivvigo:oai:www.investigo.biblioteca.uvigo.es:11093/1451 2023-05-15T16:53:01+02:00 Acidification and transports of water masses and CO2 in the North Atlantic Acidificación y transportes de masas de agua y CO2 en el Atlántico Norte Acidificación e transportes de masas de auga e CO2 no Atlántico Norte García Ibáñez, María Isabel Fernández Pérez, Fiz 2015-07-02 http://hdl.handle.net/11093/1451 eng eng Programa de Doutoramento en Ciencias Mariñas, Tecnoloxía e Xestión (RD 99/2011) http://hdl.handle.net/11093/1451 Attribution-NonCommercial-NoDerivs 3.0 Spain http://creativecommons.org/licenses/by-nc-nd/3.0/es/ openAccess 2510.02 Oceanografía Química 2510.03 Oceanografía descriptiva 2510.07 Oceanografía Física doctoralThesis 2015 ftunivvigo 2023-04-11T23:24:16Z The rise in the atmospheric CO2 levels due to human activities (CANT) is softened by its oceanic uptake. But this absorption leads to a suite of chemical changes collectively known as ocean acidification. Although acidification occurs in the world ocean, its impacts tend to be stronger in the high latitude oceans. Moreover, in some regions where vertical movements are relatively fast, i.e., in regions of water mass formation such as the Subpolar North Atlantic, the timescale for deep penetration of CANT is on the order of decades, thus being faster exposed to the acidification effects. This thesis focuses on the acidification and transports of water masses and CO2 in the North Atlantic Subpolar Gyre (NASPG). The changes in CANT, pH, total alkalinity (AT) and aragonite saturation were evaluated in the main water masses of the Irminger and Iceland Basins for the period 1981–2014. The CANT uptake in both basins led to significant acidification rates in the whole water column, which drive the shoaling of the aragonite saturation horizon. The impact of acidification on the CaCO3 pump led to an AT increase in intermediate and deep waters of the Irminger Sea, although models predict that the AT increase would not be detectable until 2040. pH was decomposed in two terms: one derived from the CANT penetration (DpHCant) and another not directly related to the CANT uptake (DpHVar). At steady state, DpHVar would be constant and all the pH changes would be explained through DpHCant. However, in the intermediate waters of the Irminger Basin DpHCant only explains 64-92% of the observed pH decrease and DpHVar contributes to explain up to 28% of the pH change, driven mainly by ventilation changes. To determine the effect of the circulation changes in the oceanic uptake and storage of CANT, the water mass distribution, transport and transformation in the NASPG are discussed for the first decade of the 2000s (2002–2010), as well as the inter-annual variability of the water mass structure from 1997 to 2010. The reduction of the ... Doctoral or Postdoctoral Thesis Iceland North Atlantic Ocean acidification University of Vigo: Investigo (Repositorio Institucional de la Universidade de Vigo) Irminger Sea ENVELOPE(-34.041,-34.041,63.054,63.054) Irminger Basin ENVELOPE(-36.000,-36.000,61.000,61.000) Auga ENVELOPE(21.691,21.691,78.507,78.507) |
institution |
Open Polar |
collection |
University of Vigo: Investigo (Repositorio Institucional de la Universidade de Vigo) |
op_collection_id |
ftunivvigo |
language |
English |
topic |
2510.02 Oceanografía Química 2510.03 Oceanografía descriptiva 2510.07 Oceanografía Física |
spellingShingle |
2510.02 Oceanografía Química 2510.03 Oceanografía descriptiva 2510.07 Oceanografía Física García Ibáñez, María Isabel Acidification and transports of water masses and CO2 in the North Atlantic |
topic_facet |
2510.02 Oceanografía Química 2510.03 Oceanografía descriptiva 2510.07 Oceanografía Física |
description |
The rise in the atmospheric CO2 levels due to human activities (CANT) is softened by its oceanic uptake. But this absorption leads to a suite of chemical changes collectively known as ocean acidification. Although acidification occurs in the world ocean, its impacts tend to be stronger in the high latitude oceans. Moreover, in some regions where vertical movements are relatively fast, i.e., in regions of water mass formation such as the Subpolar North Atlantic, the timescale for deep penetration of CANT is on the order of decades, thus being faster exposed to the acidification effects. This thesis focuses on the acidification and transports of water masses and CO2 in the North Atlantic Subpolar Gyre (NASPG). The changes in CANT, pH, total alkalinity (AT) and aragonite saturation were evaluated in the main water masses of the Irminger and Iceland Basins for the period 1981–2014. The CANT uptake in both basins led to significant acidification rates in the whole water column, which drive the shoaling of the aragonite saturation horizon. The impact of acidification on the CaCO3 pump led to an AT increase in intermediate and deep waters of the Irminger Sea, although models predict that the AT increase would not be detectable until 2040. pH was decomposed in two terms: one derived from the CANT penetration (DpHCant) and another not directly related to the CANT uptake (DpHVar). At steady state, DpHVar would be constant and all the pH changes would be explained through DpHCant. However, in the intermediate waters of the Irminger Basin DpHCant only explains 64-92% of the observed pH decrease and DpHVar contributes to explain up to 28% of the pH change, driven mainly by ventilation changes. To determine the effect of the circulation changes in the oceanic uptake and storage of CANT, the water mass distribution, transport and transformation in the NASPG are discussed for the first decade of the 2000s (2002–2010), as well as the inter-annual variability of the water mass structure from 1997 to 2010. The reduction of the ... |
author2 |
Fernández Pérez, Fiz |
format |
Doctoral or Postdoctoral Thesis |
author |
García Ibáñez, María Isabel |
author_facet |
García Ibáñez, María Isabel |
author_sort |
García Ibáñez, María Isabel |
title |
Acidification and transports of water masses and CO2 in the North Atlantic |
title_short |
Acidification and transports of water masses and CO2 in the North Atlantic |
title_full |
Acidification and transports of water masses and CO2 in the North Atlantic |
title_fullStr |
Acidification and transports of water masses and CO2 in the North Atlantic |
title_full_unstemmed |
Acidification and transports of water masses and CO2 in the North Atlantic |
title_sort |
acidification and transports of water masses and co2 in the north atlantic |
publisher |
Programa de Doutoramento en Ciencias Mariñas, Tecnoloxía e Xestión (RD 99/2011) |
publishDate |
2015 |
url |
http://hdl.handle.net/11093/1451 |
long_lat |
ENVELOPE(-34.041,-34.041,63.054,63.054) ENVELOPE(-36.000,-36.000,61.000,61.000) ENVELOPE(21.691,21.691,78.507,78.507) |
geographic |
Irminger Sea Irminger Basin Auga |
geographic_facet |
Irminger Sea Irminger Basin Auga |
genre |
Iceland North Atlantic Ocean acidification |
genre_facet |
Iceland North Atlantic Ocean acidification |
op_relation |
http://hdl.handle.net/11093/1451 |
op_rights |
Attribution-NonCommercial-NoDerivs 3.0 Spain http://creativecommons.org/licenses/by-nc-nd/3.0/es/ openAccess |
_version_ |
1766043540743258112 |