Theme coordinator: Martin Schultz, Forschungszentrum Jülich
The component for chemically reactive gases is built in this theme. The ECMWF model is extended to include species observed from space: ozone, nitrogen dioxide, carbon monoxide, sulphur dioxide and formaldehyde. Chemical production and loss are derived from a coupled chemical transport model that also provides distributions of other species. One of three chemical models (MOCAGE, MOZART-3 or TM5) may be utilized. System performance is assessed for both analysis and forecast modes through comparison with independent observations, with emphasis placed on chosen episodes of special interest. A module providing monitoring and prediction of UV radiation at the earth’s surface is also being developed.
Data for assimilation come from instruments flying on satellites such as ENVISAT, METOP and those in the EOS series. The map shows the change in modelled total-column carbon monoxide due to assimilation of MOPITT data for 15–30 July 2003. The right panel shows modelled vertical profiles with (red) and without (green) assimilation, and the corresponding independent profile (black) from instrumented (MOZAIC) commercial aircraft flights into and out of Osaka, Japan, averaged over the period.