当前位置:
X-MOL 学术
›
Atmos. Chem. Phys.
›
论文详情
Our official English website, www.x-mol.net, welcomes your
feedback! (Note: you will need to create a separate account there.)
Discrepancy in assimilated atmospheric CO over East Asia in 2015–2020 by assimilating satellite and surface CO measurements
Atmospheric Chemistry and Physics ( IF 5.2 ) Pub Date : 2022-06-16 , DOI: 10.5194/acp-22-7815-2022 Zhaojun Tang , Jiaqi Chen , Zhe Jiang
Atmospheric Chemistry and Physics ( IF 5.2 ) Pub Date : 2022-06-16 , DOI: 10.5194/acp-22-7815-2022 Zhaojun Tang , Jiaqi Chen , Zhe Jiang
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 assimilated atmospheric CO over East Asia in 2015–2020, via
assimilating CO measurements from the Measurement of Pollution in the
Troposphere (MOPITT) instrument and Ministry of Ecology and Environment of China (MEE)
monitoring network. We find noticeable inconsistencies in the assimilations:
the adjusted CO columns (Xco) are about 162, 173 and 172 ppb by assimilating
surface CO measurements, in contrast to 138–144, 149–155 and 144–151 ppb by
assimilating MOPITT CO observations over East China, the North China Plain (NCP),
and the Yangtze River Delta (YRD), respectively. These inconsistencies could be
associated with possible representation errors due to differences between
urban and regional CO backgrounds. Furthermore, the adjusted surface CO
concentrations are about 631, 806, and 657 ppb by assimilating surface CO
measurements, in contrast to 418–427, 627–639 and 500–509 ppb by
assimilating MOPITT CO observations over East China, NCP, and YRD,
respectively; assimilations of normalized surface CO measurements (to
mitigate the influences of representation errors) indicate declines of CO
columns by about 2.2, 2.1, and 1.8 ppb yr−1, in contrast to 0.63–0.86,
0.97–1.29, and 1.0–1.27 ppb yr−1 by assimilating MOPITT CO measurements over East
China, South Korea, and Japan, respectively. These discrepancies reflect the
different vertical sensitivities of satellite and surface observations in
the lower and free troposphere. This work demonstrates the importance of
integrating information from satellite and surface measurements to provide a
more accurate evaluation of atmospheric CO changes.
更新日期:2022-06-16