Abstract
A three-dimensional global ozone distribution has been derived from assimilation of ozone profiles that were observed by satellites. By simultaneous assimilation of ozone profiles retrieved from the nadir looking satellite instruments Global Ozone Monitoring Experiment 2 (GOME-2) and Ozone Monitoring Instrument (OMI), which measure the atmosphere at different times of the day, the quality of the derived atmospheric ozone field has been improved. The assimilation is using an extended Kalman filter in which chemical transport model TM5 has been used for the forecast. The combined assimilation of both GOME-2 and OMI improves upon the assimilation results of a single sensor. The new assimilation system has been demonstrated by processing 4 years of data from 2008 to 2011. Validation of the assimilation output by comparison with sondes shows that biases vary between ĝ'5 and +10ĝ€̄% between the surface and 100ĝ€̄hPa. The biases for the combined assimilation vary between ĝ'3 and +3ĝ€̄% in the region between 100 and 10ĝ€̄hPa where GOME-2 and OMI are most sensitive. This is a strong improvement compared to direct retrievals of ozone profiles from satellite observations.
| Original language | English |
|---|---|
| Pages (from-to) | 1685-1704 |
| Number of pages | 20 |
| Journal | Atmospheric Chemistry and Physics |
| Volume | 18 |
| Issue number | 3 |
| DOIs | |
| Publication status | Published - 6 Feb 2018 |
Funding
Acknowledgements. The authors acknowledge all scientists and institutes who contributed their ozone sonde data to the World Ozone and Ultraviolet Radiation Data Centre (WOUDC, WMO/GAW, 2016), and the Meteorological Service of Canada for hosting this important public database. The authors would also like to thank Pepijn Veefkind for his comments in preparation of this paper. EUMETSAT is acknowledged for providing the GOME-2 L1 data and Olaf Tuinder and Robert van Versendaal for their help in the retrieval of the GOME-2 ozone profiles. The Dutch–Finnish OMI instrument is part of the NASA EOS Aura satellite payload. The OMI ozone profiles (OMO3PR, v003) were retrieved at NASA Goddard Earth Sciences Data and Information Services Center (GES DISC) and accessed from the local storage at the Royal Netherlands Meteorological Institute (KNMI). Part of this research has been funded by the Ozone_cci project (http://www.esa-ozone-cci.org), which is part of the Climate Change Initiative (CCI) programme of the European Space Agency (ESA).
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