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dc.contributor.authorPérez, Fiz F.-
dc.contributor.authorVázquez Rodríguez, Marcos-
dc.contributor.authorMercier, Herlé-
dc.contributor.authorVelo, A.-
dc.contributor.authorLherminier, Pascale-
dc.contributor.authorRíos, Aida F.-
dc.identifier.citationBiogeosciences 7(5): 1789-1807 (2010)en_US
dc.description19 páginas, 5 figuras, 3 tablas, 2 apéndices.en_US
dc.description.abstractA high-quality inorganic carbon system database, spanning over three decades (1981–2006) and comprising of 13 cruises, has allowed the applying of the φC°T method and coming up with estimates of the anthropogenic CO2 (Cant) stored in the main water masses of the North Atlantic. In the studied region, strong convective processes convey surface properties, like Cant, into deeper ocean layers and grants this region an added oceanographic interest from the point of view of air-sea CO2 exchanges. Generally, a tendency for decreasing Cant storage rates towards the deep layers has been observed. In the Iberian Basin, the North Atlantic Deep Water has low Cant concentrations and negligible storage rates, while the North Atlantic Central Water in the upper layers shows the largest Cant 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 Cant 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 Cant 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 Cant. Overall, the Cant 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 CO2 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 CO2 sink.en_US
dc.description.sponsorshipThis work was developed and funded by the OVIDE research project from the French research institutions IFREMER and CNRS/INSU, by the European Commission within the 6th Framework Programme (EU FP6 CARBOOCEAN Integrated Project, Contract no. 511176), and by the Spanish research project M4AO (Modelo Multiparamétrico de mistura das masas de agua océanicas PGIDIT07PXIB402153PR). Marcos Vázquez-Rodríguez is funded by Consejo Superior de Investigaciones Científicas (CSIC) I3P predoctoral grant program REF.: I3P-BPD2005.en_US
dc.format.extent4916960 bytes-
dc.publisherCopernicus Publicationsen_US
dc.relation.isversionofPublisher’s version-
dc.titleTrends of anthropogenic CO2 storage in North Atlantic water massesen_US
dc.description.peerreviewedPeer revieweden_US
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