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Partitioning of the global fossil CO2 sink using a 19-year trend in atmospheric O2
journal contributionposted on 2023-05-16, 11:52 authored by Langenfelds, RL, Francey, RJ, Steele, LP, Battle, M, Keeling, RF, Budd, WF
O2/N2 is measured in the Cape Grim Air Archive (CGAA), a suite of tanks filled with background air at Cape Grim, Tasmania (40.7Â°S, 144.8Â°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 Î´13C 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 Î´(O2/N2) of -16.7 Â± 0.5 per meg yr-1, implying net storage of +2.3 Â± 0.7 GtC (1015 g carbon) yr-1 of fossil fuel CO2 in the oceans and +0.2 Â± 0.9 GtC yr-1 in the terrestrial biosphere. The uptake terms are consistent for both O2/N2 and Î´13C tracers if the mean 13C isotopic disequilibrium flux, combining terrestrial and oceanic contributions, is 93 Â± 15 GtC â€° yr-1. Copyright 1999 by the American Geophysical Union.
Publication titleGeophysical Research Letters
Department/SchoolInstitute for Marine and Antarctic Studies
PublisherAmerican Geophysical Union
Place of publicationWashington