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Annales Geophysicae An interactive open-access journal of the European Geosciences Union
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Volume 14, issue 11
Ann. Geophys., 14, 1111–1118, 1996
© European Geosciences Union 1996
Ann. Geophys., 14, 1111–1118, 1996
© European Geosciences Union 1996

  30 Nov 1996

30 Nov 1996

On the assimilation of total-ozone satellite data

P. F. Levelt, M. A. Allaart, and H. M. Kelder P. F. Levelt et al.
  • Royal Netherlands Meteorological Institute (KNMI), 3730 AE De Bilt, The Netherlands

Abstract. A two-dimensional model for advection and data assimilation of total-ozone data has been developed. The Assimilation Model KNMI (AMK) is a global model describing the transport of the column amounts of ozone, by a wind field at a single pressure level, assuming that total ozone behaves as a passive tracer. In this study, ozone column amounts measured by the TIROS Operational Vertical Sounder (TOVS) instrument on the National Oceanic and Atmospheric Administration (NOAA) polar satellites and wind fields from the Meteorological Archive and Retrieval System (MARS) archives at ECMWF have been used. By means of the AMK, the incomplete space-time distribution of the TOVS measurements is filled in and global total-ozone maps at any given time can be obtained. The choice of wind field to be used for transporting column amounts of ozone is extensively discussed. It is shown that the 200-hPa wind field is the optimal single-pressure-level wind field for advecting total ozone. Assimilated ozone fields are the basic information for research on atmospheric chemistry and dynamics, but are also important for the validation of ozone measurements.

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