Assimilation of T-TREC-Retrieved Wind Data with WRF 3DVAR for the Short-term Forecasting of Typhoon Meranti (2010) near Landfall

摘要

For most operational radar,such as the WSR-88D of the U.S.,and WSR-98D of China,the maximum Doppler velocity range is about 150 km,far less than the maximum range of reflectivity,Z data,typically 460 km.It would thus be advantageous if the reflectivity data could be used to estimate the wind field to alleviate the limitations of wind data from single Doppler radar.An extended Tracking Radar Echo by Correlation (TREC) technique,called T-TREC technique,has been developed recently to retrieve horizontal circulations within tropical cyclones (TCs) from single Doppler radar reflectivity (Z) and radial velocity (V r,when available) data.This study explores,for the first time,the assimilation of T-TREC-retrieved winds for a landfalling typhoon,Meranti (2010),into a convection-resolving model,the WRF.