On the assimilation of total-ozone satellite data

[摘要] A two-dimensional model for advection anddata assimilation of total-ozone data has been developed. The Assimilation ModelKNMI (AMK) is a global model describing the transport of the column amounts ofozone, by a wind field at a single pressure level, assuming that total ozonebehaves as a passive tracer. In this study, ozone column amounts measured by theTIROS Operational Vertical Sounder (TOVS) instrument on the National Oceanic andAtmospheric Administration (NOAA) polar satellites and wind fields from theMeteorological Archive and Retrieval System (MARS) archives at ECMWF have beenused. By means of the AMK, the incomplete space-time distribution of the TOVSmeasurements is filled in and global total-ozone maps at any given time can beobtained. The choice of wind field to be used for transporting column amounts ofozone is extensively discussed. It is shown that the 200-hPa wind field is theoptimal single-pressure-level wind field for advecting total ozone. Assimilatedozone fields are the basic information for research on atmospheric chemistry anddynamics, but are also important for the validation of ozone measurements.

[学科分类] 地球科学(综合)