Multidecadal CO2uptake variability of the North Atlantic.

Löptien, Ulrike and Eden, Carsten (2010) Multidecadal CO2uptake variability of the North Atlantic. Open Access Journal of Geophysical Research: Atmospheres, 115 (D12). D12113. DOI 10.1029/2009JD012431.

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Abstract

The multidecadal variability of air-sea CO(2)fluxes in the North Atlantic under preindustrial atmospheric CO(2) conditions is simulated, using a coupled biogeochemical/circulation model driven by long-term surface forcing reconstructed from the leading modes of sea level pressure observations from 1850 to 2000. Heat fluxes are of great importance for the multidecadal CO(2) fluctuations, about equal in magnitude to wind stress, in contrast to their less prominent role for CO(2) flux variability on interannual timescales. Another difference, compared to higher frequencies, is the dominance of the North Atlantic Oscillation in driving the variability of the air-sea CO(2) fluxes. Two spatially distinct regimes lead to large anomalies in the CO(2) fluxes but compensate to a large degree. The first regime is advective and has its clear signature southeast of Greenland while the second one, in the vicinity of the Labrador Sea and off Newfoundland, is convective. In both regimes, the multidecadal CO(2) fluctuations are driven mainly by variations in temperature, salinity, and DIC content at the sea surface while the role of the biological pump is of minor importance in this particular model. The magnitude of the simulated multidecadal CO(2) uptake changes is on the order of 0.02 Pg C/yr and amounts to 10-15% of the estimated annual anthropogenic CO(2) uptake of the North Atlantic.

Document Type: Article
Keywords: Oceanography; Biogeochemistry; INTERANNUAL VARIABILITY; DECADAL VARIABILITY; OCEANIC SINK; CARBON SINK; MODEL; SEA; CIRCULATION; OSCILLATION; FLUX; EXCHANGE ; CO2 uptake; climate variability; North Atlantic
Research affiliation: OceanRep > GEOMAR > FB2 Marine Biogeochemistry > FB2-BM Biogeochemical Modeling
OceanRep > GEOMAR > FB1 Ocean Circulation and Climate Dynamics > FB1-TM Theory and Modeling
Refereed: Yes
Open Access Journal?: No
DOI etc.: 10.1029/2009JD012431
ISSN: 2169-8996
Date Deposited: 11 Jan 2012 06:46
Last Modified: 06 Feb 2018 12:52
URI: http://oceanrep.geomar.de/id/eprint/13364

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