We present
measurements of atmospheric O2/N2 ratio and CO2
mole fractions from flask samples collected at Hateruma
Island and Cape Ochi-Ishi, and onboard
cargo ships between Japan
and the United States, and Japan and Australia
(or New Zealand).
Average changes in the O2 and CO2 for the 6-year period
from 1998 to 2004 are –23.3 ± 0.3 ppm and 10.4 ± 0.1 ppm, respectively.
Assuming that the ocean is neither a source nor a sink for the atmospheric O2,
we estimate the CO2 uptake by the terrestrial biosphere and the
ocean to be 1.1 ± 0.6 PgC yr-1 and 2.0 ± 0.5 PgC yr-1,
respectively.
Author: Y. Tohjima, H. Mukai, Y. Nojiri, T. Machida, et al (tohjima at nies dot go dot jp)
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