A 3DVAR METHOD FOR SINGLE DOPPLER VELOCITY RETRIEVAL WITH SEVERE THUNDERSTORMS

摘要

The NEXRAD system covers most of the United States, but provides only single-Doppler coverage for most areas. To use the data for diagnostic studies and especially in numerical models, techniques for single-Doppler velocity retrievals (SDVR) and data assimilation have been developed since the last decade (e. g., Sun et al. 1991; Qiu and Xu 1992; Shapiro et al. 1995; Laroche et al. 1994; Zhang et al. 1996; Xu et al. 1995, 2001; Gao et al. 1999a, 2001). These techniques attempt to retrieve two, or three components of wind given observations of radial velocity and reflectivity.