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| Titel |
Data assimilation of satellite-retrieved ozone, carbon monoxide and nitrogen dioxide with ECMWF's Composition-IFS |
| VerfasserIn |
A. Inness, A.-M. Blechschmidt, I. Bouarar, S. Chabrillat, M. Crepulja, R. J. Engelen, H. Eskes, J. Flemming, A. Gaudel, F. Hendrick, V. Huijnen, L. Jones, J. Kapsomenakis, E. Katragkou, A. Keppens, B. Langerock, M. Mazière, D. Melas, M. Parrington, V. H. Peuch, M. Razinger, A. Richter, M. G. Schultz, M. Suttie, V. Thouret, M. Vrekoussis, A. Wagner, C. Zerefos |
| 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 ; 15, no. 9 ; Nr. 15, no. 9 (2015-05-13), S.5275-5303 |
| Datensatznummer |
250119708
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| Publikation (Nr.) |
 copernicus.org/acp-15-5275-2015.pdf |
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| Zusammenfassung |
| Daily global analyses and 5-day forecasts are generated in the context of
the European Monitoring Atmospheric Composition and Climate (MACC) project
using an extended version of the Integrated Forecasting System (IFS) of the
European Centre for Medium-Range Weather Forecasts (ECMWF). The IFS now
includes modules for chemistry, deposition and emission of reactive gases,
aerosols, and greenhouse gases, and the 4-dimensional variational data
assimilation scheme makes use of multiple satellite observations of
atmospheric composition in addition to meteorological observations. This
paper describes the data assimilation setup of the new Composition-IFS
(C-IFS) with respect to reactive gases and validates analysis fields of
ozone (O3), carbon monoxide (CO), and nitrogen dioxide (NO2) for
the year 2008 against independent observations and a control run without
data assimilation. The largest improvement in CO by assimilation of
Measurements of Pollution in the Troposphere (MOPITT) CO columns is seen in
the lower troposphere of the Northern Hemisphere (NH) extratropics during
winter, and during the South African biomass-burning season. The
assimilation of several O3 total column and stratospheric profile
retrievals greatly improves the total column, stratospheric and upper
tropospheric O3 analysis fields relative to the control run. The impact
on lower tropospheric ozone, which comes from the residual of the total
column and stratospheric profile O3 data, is smaller, but nevertheless
there is some improvement particularly in the NH during winter and spring.
The impact of the assimilation of tropospheric NO2 columns from the
Ozone Monitoring Instrument (OMI) is small because of the short lifetime of
NO2, suggesting that NO2 observations would be better used to
adjust emissions instead of initial conditions. The results further indicate
that the quality of the tropospheric analyses and of the stratospheric ozone
analysis obtained with the C-IFS system has improved compared to the
previous "coupled" model system of MACC. |
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