Oceanic CO2 uptake and biogeochemical variability during the formation of the Eastern North Atlantic Central water under two contrasting NAO scenarios

10 páginas, 8 figuras Long-term variability of the biogeochemical properties during the formation of central waters in the Eastern North Atlantic were analyzed between 42–47°N and 10–20°W from the dataset gathered during the Galicia VII (GVII) and C. Darwin 58/59 (CD58/59) cruises. These cruises tha...

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Bibliographic Details
Published in:Journal of Marine Systems
Main Authors: Padín, X. A., Castro, Carmen G., Ríos, Aida F., Pérez, Fiz F.
Format: Article in Journal/Newspaper
Language:English
Published: Elsevier 2011
Subjects:
Air–sea CO2 fluxes
NAO
Climate variability
ENACW formation
Biogeochemical variability
Northeast Atlantic
North Atlantic
North Atlantic oscillation
Online Access:http://hdl.handle.net/10261/54385
https://doi.org/10.1016/j.jmarsys.2010.10.002
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Summary:10 páginas, 8 figuras Long-term variability of the biogeochemical properties during the formation of central waters in the Eastern North Atlantic were analyzed between 42–47°N and 10–20°W from the dataset gathered during the Galicia VII (GVII) and C. Darwin 58/59 (CD58/59) cruises. These cruises that showed important changes in the thermohaline properties and the nutrient abundance of the upper layers were carried out under contrasting conditions of the North Atlantic Oscillation (NAO) index. The different climate forcing led ameridional shift of the transition zone between the formation regions of subpolar and subtropical Eastern North Atlantic CentralWater (ENACWp and ENACWt, respectively). This displacement conditioned the presence of each ENACW in the study region and so the thermohaline and biogeochemical properties. The effect of the observed variability at decadal scale on the air– sea CO2 gradient (ΔfCO2) and exchange (FCO2) was analyzed using 1D model approach throughout 11 weeklysteps that simulated the development of a spring bloomduring the shoaling of the mixed layer. The outputs of the model showed an intensification of the ocean CO2 uptake due to higher biological CO2 drawdown, during positive NAO conditions and its weakening under negative NAO influence. Processing work was supported by the European Commission within the 6th Framework Programme (EU FP6 CARBOOCEAN Integrated Project, contract no. 511176) and the ECO project (MCyT REN2002-00503/MAR). Peer reviewed

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