Interannual variability of air-sea O2 fluxes and the determination of CO2 sinks using atmospheric O2/N2

Details Interannual variability of air-sea O2 fluxes and the determination of CO2 sinks using atmospheric O2/N2 Interannual variability of air-sea O2 fluxes and the determination of CO2 sinks using atmospheric O2/N2

Feb 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003georl..30c...1m&link_type=abstract

Geophysical Research Letters, Volume 30, Issue 3, pp. 1-1, CiteID 1101, DOI 10.1029/2002GL016044

Mathematics

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11

Oceanography: Biological And Chemical: Carbon Cycling, Global Change: Biogeochemical Processes (4805), Oceanography: General: Numerical Modeling, Atmospheric Composition And Structure: Air/Sea Constituent Fluxes (3339, 4504), Oceanography: General: Climate And Interannual Variability (3309)

Scientific paper

Motivated by the use of atmospheric O2/N2 to determine CO2 sinks under the assumption of negligible interannual variability in air-sea O2 fluxes, we examine interannual fluctuations of the global air-sea flux of O2 during the period 1980-1998 using a global ocean circulation and biogeochemistry model along with an atmospheric transport model. It is found that both the El Niño/Southern Oscillation (ENSO) cycle and wintertime convection in the North Atlantic are primary drivers of global air-sea oxygen flux interannual variability. Model estimated extremes of O2 flux variability are -70/+100 × 1012 mol/yr (Tmol/yr), where positive fluxes are to the atmosphere. O2/N2 variability could cause an up to +/-1.0 PgC/yr error in estimates of interannual variability in land and ocean CO2 sinks derived from atmospheric O2/N2 observations.

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