Evaluation of the CAMS global atmospheric trace gas reanalysis 2003–2016 using aircraft campaign observations
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Published:2020-04-17
Issue:7
Volume:20
Page:4493-4521
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ISSN:1680-7324
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Container-title:Atmospheric Chemistry and Physics
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language:en
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Short-container-title:Atmos. Chem. Phys.
Author:
Wang YutingORCID, Ma Yong-FengORCID, Eskes HenkORCID, Inness AntjeORCID, Flemming JohannesORCID, Brasseur Guy P.
Abstract
Abstract. The Copernicus Atmosphere Monitoring Service (CAMS)
operated by the European Centre for Medium-Range Weather Forecasts (ECMWF)
has produced a global reanalysis of aerosol and reactive gases (called
CAMSRA) for the period 2003–2016. Space observations of ozone, carbon
monoxide, NO2 and aerosol optical depth are assimilated by a 4D-Var
method in the 60-layer ECMWF global atmospheric model, which for the
reanalysis is operated at a horizontal resolution of about 80 km. As a
contribution to the evaluation of the reanalysis, we compare atmospheric
concentrations of different reactive species provided by the CAMS reanalysis
with independent observational data gathered by airborne instrumentation
during the field campaigns INTEX-A, INTEX-B, NEAQS-ITCT, ITOP, AMMA, ARCTAS,
VOCALS, YAK-AEROSIB, HIPPO and KORUS-AQ. We show that the reanalysis
rather successfully reproduces the observed concentrations of chemical
species that are assimilated in the system, including O3 and CO with
biases generally less than 20 %, but generally underestimates the
concentrations of the primary hydrocarbons and secondary organic species. In
some cases, large discrepancies also exist for fast-reacting radicals such
as OH and HO2.
Publisher
Copernicus GmbH
Subject
Atmospheric Science
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