Cloud Drift Wind Data-3DVAR And The Application In Typhoon Experiments

China is a typhoon-prone country, the annual typhoon disaster losses occupiesthe head of the ten nature disasters.Disasters brought by the typhoon are usually inthe before and after landing, due to past sea exploration technology and the limitedobservational data, landed the question research to the typhoon to be limited. In re-cent years, along with the air sounding technology development, satellite cloud driftwind data series of high spatial and temporal resolution of the unconventional infor-mation makes up for the shortage of ocean observational data, using the assimilationway, application of unconventional data in model may be effective in improving themodel initial fields.This paper selects two major typhoon examples: No. 0509 typhoon "Matsa"and No. 0604 strong tropical storm "Bilis".Using data from the NCEP global objec-tive information and analysis of FY-2 satellite to retrieve the infrared and water va-por Channel cloud drift wind data,WRF-3DVAR system is introduced to find the influence of different channel cloud track drift data on initial field improvements. Onthis basis, the track, precipitation and maintain mechanisms for diagnosis and analysis preliminary discussion of the cloud drift wind data typhoon prediction exerimentin the application.Assimilation of cloud drift wind data from two channels brings better impro-vement on the "Metsa" initial field, only one channel assimilation,water vapor per-forms better in improving temperature and pressure and wind fields than the infraredchannel. "Matsa" after landing with the long-term sustainability of many factors, itsown strength and plenty of moisture to add is a necessary condition. Strong tropicalstorm "Bilis" though intensity is not too high, but brought along a very serious precipitation, The introduction of assimilation cloud drift wind data, the right Bilis large-scale environmental flow improved to a certain extent. Especially for the location an d the subtropical high intensity, high pressure centers, compared to the control test issignificantly improved. Wind of the improvement reflected mainly in the troposphereUpper. Bilis is obviously non-symmetric structures, heavy rainfall occurred in thesouth side of the storm. Southwest monsoon provides very abundant moisture conditions in which precipitation has been able to maintain strong. Convective rain overthe vigorous campaign, a very good impetus for uplift, lower vorticity is the largestin the district and high-altitude areas and divergence of rain are better relationship.