Articles | Volume 22, issue 10
Atmos. Chem. Phys., 22, 6953–6970, 2022
https://doi.org/10.5194/acp-22-6953-2022
Atmos. Chem. Phys., 22, 6953–6970, 2022
https://doi.org/10.5194/acp-22-6953-2022
Research article
31 May 2022
Research article | 31 May 2022

Spatiotemporal variations of the δ(O2 ∕ N2), CO2 and δ(APO) in the troposphere over the western North Pacific

Shigeyuki Ishidoya et al.

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Short summary
The atmospheric O2 / N2 ratio and CO2 concentration over the western North Pacific are presented. We found significant modification of the seasonal APO cycle in the middle troposphere due to the interhemispheric mixing of air. APO driven by the net marine biological activities indicated annual sea–air O2 flux during El Niño. Terrestrial biospheric and oceanic CO2 uptakes during 2012–2019 were estimated to be 1.8 and 2.8 Pg C a−1, respectively.
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