Numerical Study on the Effect of Variations in Sea Surface Temperature on Intensity of Typhoon Haitang

The effect of variations in sea surface temperature(SST) on typhoon intensity is studied by making a numerical simulation of Typhoon Haitang for 5 days.Compared with the NCEP monthly mean SST data,the TMI/AMSR-E SST data are ingested into the mesoscale atmospheric model to study the effect of daily variations in SST on the track and intensity of Typhoon Haitang.It is shown from the study results that the typhoon track and intensity simulated by the experiment with daily varying SST are generally good,that is,the simulated typhoon track is not sensitive to the variations in SST,and the variations in typhoon intensity are dependent not only on the magnitude of SST cooling range caused by typhoon migration but also on the relative position of SST cooling area.In the intense development process of Typhoon Haitang,the effect of cooling area on the right of typhoon center on typhoon center air pressure was slight,and the SST cooling area began to affect the typhoon intense after the intense typhoon development,but the decrease in typhoon center air pressure was small,and the typhoon center air pressure was reduced by about 3.9 hpa within 6 hours.The sea surface heat fluxes are closely related to the sea surface wind speed and SST distributions,the positive extreme areas of sea surface heat fluxes and wind speed were distributed in the warm water area with positive SST variations,and the negative extreme areas of sea surface heat fluxes and wind speed were distributed in the SST cooling area on the right of typhoon.