Physics
Scientific paper
Jul 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999georl..26.1897l&link_type=abstract
Geophysical Research Letters, Volume 26, Issue 13, p. 1897-1900
Physics
19
Atmospheric Composition And Structure: Air/Sea Constituent Fluxes, Atmospheric Composition And Structure: Biosphere/Atmosphere Interactions, Atmospheric Composition And Structure: Constituent Sources And Sinks, Global Change: Biogeochemical Processes
Scientific paper
O2/N2 is measured in the Cape Grim Air Archive (CGAA), a suite of tanks filled with background air at Cape Grim, Tasmania (40.7°S, 144.8°E) between April 1978 and January 1997. Derived trends are compared with published O2/N2 records and assessed against limits on interannual variability of net terrestrial exchanges imposed by trends of δ13C in CO2. Two old samples from 1978 and 1987 and eight from 1996/97 survive critical selection criteria and give a mean 19-year trend in δ(O2/N2) of -16.7+/-0.5permegyr-1, implying net storage of +2.3+/-0.7GtC (1015gcarbon)yr-1 of fossil fuel CO2 in the oceans and +0.2+/-0.9GtCyr-1 in the terrestrial biosphere. The uptake terms are consistent for both O2/N2 and δ13C tracers if the mean 13C isotopic disequilibrium flux, combining terrestrial and oceanic contributions, is 93+/-15GtC‰yr-1.
Battle Mark
Budd William F.
Francey R. J.
Keeling Ralph F.
Langenfelds R. L.
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