HR: 09:30h
AN: OS11C-07    [Abstracts]
TI: Testing ocean models using measurements of interannual variations in atmospheric O2 and CO2 concentrations
AU: * Keeling, R F
EM: rkeeling@ucsd.edu
AF: Scripps Institution of Oceanography, 9500 Gilman Dr, La Jolla, CA 92093-0244 United States
AU: Heimann, M
AF: Max Planck Institute for Biogeochemistry, Beutenberg Campus, Jena, 07701 Germany
AU: LeQuere, C
AF: Max Planck Institute for Biogeochemistry, Beutenberg Campus, Jena, 07701 Germany
AU: Buitenhuis, E T
AF: Max Planck Institute for Biogeochemistry, Beutenberg Campus, Jena, 07701 Germany
AU: Roedenbeck, C
AF: Max Planck Institute for Biogeochemistry, Beutenberg Campus, Jena, 07701 Germany
AU: Bopp, L
AF: Laboratoire des Sciences du Climat et l'Environnement (LSCE), Bƒt. 709, Orme des Merisiers, Gif sur Yvette, F-91191 France
AU: McKinley, G
AF: University of Wisconsin - Madison Department of Atmospheric and Oceanic Sciences , 1225 W. Dayton Street, Madison, WI 53706 United States
AU: Follows, M
AF: Department of Earth, Atmosphere and Planetary Sciences Massachusetts Institute of Technology, 77 Massachusetts Av, Cambridge, MA 02139 United States
AB: Measurements of atmospheric O2 and CO2 concentration over the past 14 years show evidence of interannual variability related to both land and oceanic exchanges. The oceanic component is resolvable by summing the concentrations of O2 and CO2 to compute the tracer, atmospheric potential oxygen (APO), which varies due to the combined exchanges of CO2 and O2 across the air-sea interface but is largely invariant to land exchanges. Observed APO shows variations at stations in both the northern and southern hemispheres that are coherent between stations within each hemisphere and therefore are apparently caused by large-scale extra-tropical air-sea exchanges of CO2 and/or O2. These signals provide a window to study the response of ocean biogeochemistry to decadal climate variability. Here we compare the observed APO variability with predictions from a suite of biological ocean models driven by observed recent climate variability. The modeled air-sea O2 and CO2 fluxes are then fed into an atmospheric tracer transport model to predict APO variations. The comparison between predicted and observed interannual APO variations provides a check on the validity of the coupled models response to climate variations as well as insight into the origin of observed signals.
DE: 4820 Gases
DE: 4203 Analytical modeling
DE: 3309 Climatology (1620)
DE: 1610 Atmosphere (0315, 0325)
DE: 1615 Biogeochemical processes (4805)
SC: Ocean Sciences [OS]
MN: 2004 AGU Fall Meeting