Influence of Initial Condition Adjustment Using FY-2G Satellite Surface Temperature Retrieval Product on Typhoon Heavy Rain Simulation
Liu Wu
Li Yaodong
Shi Xiaokang
Abstract：To investigate the importance of the initial surface temperature in the typhoon heavy rain simulation,taking typhoon No.13 "Soudelor" in 2015 as a case,we use the land surface temperature (LST),sea surface temperature (SST) products derived from FY-2G satellite to replace the initial field from NCEP data of the numerical simulation.Then we calculate the precipitation TS score,forecasts ac curacy and analyze the 2 m temperature field,sensible and latent heat flux field,flow field at 900 hPa and vertical velocity field at 850 hPa.The results show that using the land (sea) surface temperature derived products as initial field do improve the effect of precipitation simulation,but the effect of improvement decreases with time,after 24 hours the effect is not significant.The LST test improves the forecast quality of light rain and moderate rain,while the SST test only improves the forecast quality of light rain.The LST test mainly affects the distribution of sensible and latent heat flux by improving the initial field of land surface temperature,then the positive anomalies of the temperature field on lower level of northeast typhoon is reduced,the cyclonic circulation become weaker,vertical speed is reduced,the false convection is restrained,and ultimately,improves the quality of precipitation forecasts.The SST test is similar to the LST test,though its improvement of precipitation is not significant,except for the south Guangdong,where the precipitation simulation is better.
Keywords：FY-2G satellitesurface temperaturenumerical simulationinitial fieldtyphoon heavy rain
Publication Date：2017-01-01
Online Publishing Date：2026-09-12(First online date of this platform, not the publication date of the document)
Pages：9( 26-34 )