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Shigeyuki Ishidoya; Shuji Aoki; Daisuke Goto; Takakiyo Nakazawa; Shoichi Taguchi; Prabir K. Patra (2012)
Publisher: Taylor & Francis Group
Journal: Tellus: Series B
Languages: English
Types: Article
Subjects: Meteorology. Climatology, QC851-999, Simulation of APO in the free troposphere, Oceanic CO2 uptake, Atmospheric Potential Oxygen (APO), O2/N2 ratio over Japan; Atmospheric Potential Oxygen (APO); Simulation of APO in the free troposphere; Terrestrial biospheric CO2 uptake; Oceanic CO2uptake, O2/N2 ratio over Japan, Terrestrial biospheric CO2 uptake
Systematic measurements of the atmospheric O2/N2 ratio have been made using aircraft and ground-based stations in Japan since 1999. The observed seasonal cycles of the O2/N2 ratio and atmospheric potential oxygen (APO) vary almost in opposite phase to that of the CO2 concentration at all altitudes, and their amplitudes and phases are generally reduced and delayed, respectively, with increasing altitude. Simulations of APO using two atmospheric transport models reproduce general features of the observed seasonal cycle, but both models fail to reproduce the phase at an altitude ranging from 8 km to the tropopause. By analysing the observed secular trends of APO and CO2 concentration, and assuming a global net oceanic O2 outgassing of 0.2±0.5 GtC yr−1, we estimate global average terrestrial biospheric and oceanic CO2 uptake for the period 2000–2010 to be 1.0±0.8 and 2.5±0.7 GtC yr−1, respectively. Keywords: O2/N2 ratio over Japan, Atmospheric Potential Oxygen (APO), Simulation of APO in the free troposphere, Terrestrial biospheric CO2 uptake, Oceanic CO2uptake(Published: 5 July 2012)Citation: Tellus B 2012, 64, 18964, http://dx.doi.org/10.3402/tellusb.v64i0.18964

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