Data assimilation of satellite-retrieved ozone, carbon monoxide and nitrogen dioxide with ECMWF's Composition-IFS

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 inc...

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Published in:Atmospheric chemistry and physics Vol. 15; no. 9; pp. 5275 - 5303
Main Authors: Inness, A., Blechschmidt, A.-M., Bouarar, I., Chabrillat, S., Crepulja, M., Engelen, R. J., Eskes, H., Flemming, J., Gaudel, A., Hendrick, F., Huijnen, V., Jones, L., Kapsomenakis, J., Katragkou, E., Keppens, A., Langerock, B., de Mazière, M., Melas, D., Parrington, M., Peuch, V. H., Razinger, M., Richter, A., Schultz, M. G., Suttie, M., Thouret, V., Vrekoussis, M., Wagner, A., Zerefos, C.
Format: Journal Article
Language:English
Published: Katlenburg-Lindau Copernicus GmbH 13.05.2015
Copernicus Publications
Subjects:
Air pollution
Analysis
Atmospheric chemistry
Atmospheric composition
Atmospheric monitoring
Atmospheric ozone
Biological assimilation
Biomass burning
Burning
Carbon dioxide
Carbon monoxide
Chemistry
Data
Data assimilation
Data collection
Emissions
Experiments
Fields
Gases
Greenhouse effect
Greenhouse gases
Initial conditions
Kalman filters
Lower troposphere
Meteorological observations
Monitoring
Monitoring instruments
Nitrogen dioxide
Northern Hemisphere
Ozone
Ozone monitoring
Satellite observation
Satellites
Troposphere
Tropospheric ozone
Weather
Weather forecasting
Winter
ISSN:1680-7324, 1680-7316, 1680-7324
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Summary: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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ISSN:1680-7324
1680-7316
1680-7324
DOI:10.5194/acp-15-5275-2015