Preprints
https://doi.org/10.5194/acp-2021-1035
https://doi.org/10.5194/acp-2021-1035
 
07 Mar 2022
07 Mar 2022
Status: a revised version of this preprint was accepted for the journal ACP and is expected to appear here in due course.

Effects of satellite and surface measurements on atmospheric CO assimilations over East Asia in 2015–2020

Zhaojun Tang, Jiaqi Chen, and Zhe Jiang Zhaojun Tang et al.
  • School of Earth and Space Sciences, University of Science and Technology of China, Hefei, Anhui, 230026, China

Abstract. Satellite and surface carbon monoxide (CO) observations have been widely used to investigate the sources and variabilities of atmospheric CO. However, comparative analyses to explore the effects of satellite and surface measurements on atmospheric CO assimilations are still lacking. Here we investigate the evolution of atmospheric CO over E. Asia in 2015–2020, via assimilating CO measurements from the Measurement of Pollution in the Troposphere (MOPITT) and China Ministry of Ecology and Environment (MEE) monitoring network. We find a possible inconsistency by assimilating satellite and surface measurements: the adjusted CO columns are about 3.29, 3.63 and 3.68 x 1018 molec/cm2 by assimilating surface CO measurements, in contrast to 2.80–2.93, 3.14–3.25 and 3.09–3.22 x 1018 molec/cm2 by assimilating MOPITT CO observations in 2015–2020 over E. China, North China Plain (NCP) and Yangtze River Delta (YRD), respectively. This inconsistency could be associated with possible representation errors due to differences between urban and regional CO backgrounds. Furthermore, assimilations of normalized surface CO measurements (to mitigate the influences of representation errors) indicate declines of CO columns by about 4.0, 4.5, and 4.0 x 1016 molec/cm2/y over E. China, South Korea and Japan in 2015–2020, respectively, in contrast to 1.7–2.1, 2.1–2.7, and 2.1–2.6 x 1016 molec/cm2/y by assimilating MOPITT CO measurements. This discrepancy reflects the different vertical sensitivities of satellite and surface observations in the lower and free troposphere. This work demonstrates the importance to integrate information from satellite and surface measurements to provide a more accurate evaluation for atmospheric CO changes.

Zhaojun Tang et al.

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on acp-2021-1035', Anonymous Referee #1, 25 Mar 2022
    • AC1: 'Reply on RC1', Zhe Jiang, 21 May 2022
  • RC2: 'Comment on acp-2021-1035', Anonymous Referee #2, 28 Mar 2022
    • AC2: 'Reply on RC2', Zhe Jiang, 21 May 2022

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on acp-2021-1035', Anonymous Referee #1, 25 Mar 2022
    • AC1: 'Reply on RC1', Zhe Jiang, 21 May 2022
  • RC2: 'Comment on acp-2021-1035', Anonymous Referee #2, 28 Mar 2022
    • AC2: 'Reply on RC2', Zhe Jiang, 21 May 2022

Zhaojun Tang et al.

Zhaojun Tang et al.

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Short summary
We provide a comparative analysis to explore the effects of satellite and surface measurements on atmospheric CO in data assimilations in 2015–2020 over E. Asia. We find possible overestimated enhancements of atmospheric CO by assimilating surface CO measurements due to model representation errors, and large discrepancy in the derived trends of CO columns due to different vertical sensitivities of satellite and surface observations to lower and free troposphere.
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