A Statistical Analysis on the Relations between Effect of Wind Vertical Shear and Landing Typhoons Intensity

111 landing typhoons' data in China in the latest 15-year(1990—2004) included intensity,landing location and NCEP/NCAR four-time/day reanalysis data for wind field are used to study the impact of vertical shear on typhoon intensity change as the typhoons landing.Compared with the open sea,the linear correlation between wind vertical shear and landing typhoons intensity is decreased,the extent of lag time is reduced.The correlation between wind vertical shear and the typhoon intensity changing in the lag of 6~18h should not be neglected.It's the best correlation with the correlation coefficient of 0.215 when the typhoon intensity changes in the lag of 6h.When the landing typhoon intensity increases significantly,the wind vertical shear is not changing greater,it is not more than 9 m.s-1.Otherwise,when the wind vertical shear is more than 9 m.s-1,the landing typhoon intensity may increase slowly.Comparing with the typhoon landed in South China,the intensity of the typhoon landed in East China is weakening faster with the effect of vertical shear.