Reconstructing the time history of the air-sea CO2 disequilibrium and its rate of change in the eastern subpolar North Atlantic, 1972-1989

Details Reconstructing the time history of the air-sea CO2 disequilibrium and its rate of change in the eastern subpolar North Atlantic, 1972-1989 Reconstructing the time history of the air-sea CO2 disequilibrium and its rate of change in the eastern subpolar North Atlantic, 1972-1989

Feb 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006georl..3304602o&link_type=abstract

Geophysical Research Letters, Volume 33, Issue 4, CiteID L04602

Mathematics

Logic

19

Atmospheric Composition And Structure: Air/Sea Constituent Fluxes (3339, 4504), Global Change: Oceans (1616, 3305, 4215, 4513), Oceanography: Biological And Chemical: Carbon Cycling (0428)

Scientific paper

This study determines the temporal changes of wintertime surface ocean partial pressure of CO2 (pCO2SW) in the eastern subpolar North Atlantic (esNA) (50-64°N 32-10°W) by using data of carbon-system parameters and chlorofluorocarbon-12 acquired in 1993. Wintertime pCO2SW and its temporal trend from early 1970s through to the late 1980s were reconstructed through the application of a back-calculation method that isolates surface variations which have been transmitted to the ocean interior during the formation of Subpolar Mode Water. Our computations suggest a pCO2SW growth rate (3 μatm/yr) which is twice as large as that of atmospheric pCO2, 1.47 μatm/yr. The sensitivity of the estimated pCO2SW growth rate to remineralization ratios as well as to the CFC-12-derived ages is discussed. Cooling and northward advection of surface water equilibrated with the increasing atmospheric CO2 is suggested as the process responsible for the excessive pCO2SW growth rate.

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