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| Titel |
Assimilation of IASI satellite CO fields into a global chemistry transport model for validation against aircraft measurements |
| VerfasserIn |
A. Klonecki, M. Pommier, C. Clerbaux, G. Ancellet, J.-P. Cammas, P.-F. Coheur, A. Cozic, G. S. Diskin, J. Hadji-Lazaro, D. A. Hauglustaine, D. Hurtmans, B. Khattatov, J.-F. Lamarque, K. S. Law, P. Nédélec, J.-D. Paris, J. R. Podolske, P. Prunet, H. Schlager, S. Szopa, S. Turquety |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1680-7316
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 12, no. 10 ; Nr. 12, no. 10 (2012-05-22), S.4493-4512 |
| Datensatznummer |
250011163
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| Publikation (Nr.) |
 copernicus.org/acp-12-4493-2012.pdf |
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| Zusammenfassung |
| This work evaluates the IASI CO product against independent in-situ aircraft
data from the MOZAIC program and the POLARCAT aircraft campaign. The
validation is carried out by analysing the impact of assimilation of eight
months of IASI CO columns retrieved for the period of May to December 2008
into the global chemistry transport model LMDz-INCA. A modelling system
based on a sub-optimal Kalman filter was developed and a specific treatment
that takes into account the representativeness of observations at the scale
of the model grid is applied to the IASI CO columns and associated errors
before their assimilation in the model. Comparisons of the assimilated CO
profiles with in situ CO measurements indicate that the assimilation leads to a
considerable improvement of the model simulations in the middle troposphere
as compared with a control run with no assimilation. Model biases in the
simulation of background values are reduced and improvement in the
simulation of very high concentrations is observed. The improvement is due
to the transport by the model of the information present in the IASI CO
retrievals. Our analysis also shows the impact of assimilation of CO on the
representation of transport into the Arctic region during the POLARCAT
summer campaign. A considerable increase in CO mixing ratios over the Asian
source region was observed when assimilation was used leading to much higher
values of CO during the cross-pole transport episode. These higher values
are in good agreement with data from the POLARCAT flights that sampled this
plume. |
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