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- W4229697527 abstract "Abstract. We present climatological carbon dioxide (CO2) distributions over the Asia-Pacific region obtained from the CONTRAIL (Comprehensive Observation Network for Trace gases by Airliner) measurements. The high-frequency in-flight CO2 measurements over 10 years reveal a clear seasonal variation of CO2 in the upper troposphere (UT), with a maximum occurring in April–May and a minimum in August–September. The CO2 mole fraction in the UT north of 40° N is low and highly variable in June–August due to the arrival of air parcels with seasonally low CO2 caused by the summertime biospheric uptake in boreal Eurasia. For August–September in particular, the UT CO2 is noticeably low within the Asian summer monsoon anticyclone associated with the convective transport of strong biospheric CO2 uptake signal over South Asia. During September as the anticyclone decays, a spreading of this low CO2 area in the UT is observed in the vertical profiles of CO2 over the Pacific Rim of the continental East Asia. Simulation results identify the influence of anthropogenic and biospheric CO2 fluxes in the seasonal evolution of the spatial CO2 distribution over the Asia-Pacific region. It is found, for example, that a substantial contribution to the UT CO2 over the northwestern Pacific comes from the continental East Asian emissions in the spring, but switches to South Asian and/or Southeast Asian air masses affected dominantly by the biospheric CO2 uptake in the summer monsoon season. The CONTRAIL CO2 data provide useful constraints to model estimates of surface fluxes and to the evaluation of the satellite observations, in particular for the Asia-Pacific region." @default.
- W4229697527 created "2022-05-11" @default.
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- W4229697527 date "2018-06-11" @default.
- W4229697527 modified "2023-10-02" @default.
- W4229697527 title "Seasonal evaluation of tropospheric CO<sub>2</sub> over the Asia-Pacific region observed by the CONTRAIL commercial airliner measurements" @default.
- W4229697527 doi "https://doi.org/10.5194/acp-2018-519" @default.
- W4229697527 hasPublicationYear "2018" @default.
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