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  Comprehensive evaluation of the Copernicus Atmosphere Monitoring Service (CAMS) reanalysis against independent observations: Reactive gases

Wagner, A., Bennouna, Y., Blechschmidt, A.-M., Brasseur, G. P., Chabrillat, S., Christophe, Y., et al. (2021). Comprehensive evaluation of the Copernicus Atmosphere Monitoring Service (CAMS) reanalysis against independent observations: Reactive gases. Elementa: Science of the Anthropocene, 9: 00171. doi:10.1525/elementa.2020.00171.

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 Creators:
Wagner , Annette1, Author
Bennouna, Y.2, Author
Blechschmidt, A-M2, Author
Brasseur, Guy P.1, Author              
Chabrillat, S.2, Author
Christophe, Y.2, Author
Errera, Q.2, Author
Eskes, H.2, Author
Flemming, J.2, Author
Hansen, K. M.2, Author
Inness, A.2, Author
Kapsomenakis, J.2, Author
Langerock, B.2, Author
Richter, A.2, Author
Sudarchikova, Natalia1, Author              
Thouret, V2, Author
Zerefos, C.2, Author
Affiliations:
1Environmental Modelling, MPI for Meteorology, Max Planck Society, Bundesstraße 53, 20146 Hamburg, DE, ou_2149681              
2external, ou_persistent22              

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 Abstract: The Copernicus Atmosphere Monitoring Service (CAMS) is operationally providing forecast and reanalysis products of air quality and atmospheric composition. In this article, we present an extended evaluation of the CAMS global reanalysis data set of four reactive gases, namely, ozone (O-3), carbon monoxide (CO), nitrogen dioxide (NO2), and formaldehyde (HCHO), using multiple independent observations. Our results show that the CAMS model system mostly provides a stable and accurate representation of the global distribution of reactive gases over time. Our findings highlight the crucial impact of satellite data assimilation and emissions, investigated through comparison with a model run without assimilated data. Stratospheric and tropospheric O-3 are mostly well constrained by the data assimilation, except over Antarctica after 2012/2013 due to changes in the assimilated data. Challenges remain for O-3 in the Tropics and high-latitude regions during winter and spring. At the surface and for short-lived species (NO2), data assimilation is less effective. Total column CO in the CAMS reanalysis is well constrained by the assimilated satellite data. The control run, however, shows large overestimations of total column CO in the Southern Hemisphere and larger year-to-year variability in all regions. Concerning the long-term stability of the CAMS model, we note drifts in the time series of biases for surface O-3 and CO in the Northern midlatitudes and Tropics and for NO2 over East Asia, which point to biased emissions. Compared to the previous Monitoring Atmospheric Composition and Climate reanalysis, changes in the CAMS chemistry module and assimilation system helped to reduce biases and enhance the long-term temporal consistency of model results for the CAMS reanalysis.

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Language(s): eng - English
 Dates: 2021-042021-05
 Publication Status: Published online
 Pages: -
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 Table of Contents: -
 Rev. Type: Peer
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Title: Elementa: Science of the Anthropocene
  Other : Elem Sci Anth
Source Genre: Journal
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Publ. Info: Oakland, CA : Univ. of California Press
Pages: - Volume / Issue: 9 Sequence Number: 00171 Start / End Page: - Identifier: ISSN: 2325-1026
CoNE: https://pure.mpg.de/cone/journals/resource/2325-1026