In order to re-examine some trends related to tropical cyclones（TCs） over the western North Pacific since 1949,the unreliable maximum sustained wind(V;) recorded in the 1949-1978 TC best-track data from the Shanghai...In order to re-examine some trends related to tropical cyclones（TCs） over the western North Pacific since 1949,the unreliable maximum sustained wind(V;) recorded in the 1949-1978 TC best-track data from the Shanghai Typhoon Institute was modified based on the wind-pressure relationships（WPRs） in this study. Compared to the WPR scheme based on the cyclostrophic balance,the WPR scheme based on the gradient balance could give a better fit to TCs under higher wind speeds and could introduce smaller estimated errors for TCs locating at higher latitudes as well as TCs landing on the continent.After the V;modification based on minimum sea-level pressure and TC center latitude,the revised annual number of category 4-5 typhoons shows no long-term trend,while the potential destructiveness measured by power-dissipation index decreases slightly,and this trend is not significant in the period 1949-2008.展开更多
基金National Basic Research Program of China(973 Program, 2009CB421502)the National Natural Science Foundation of China(Grant Nos.40830958,40730948,and 90715031).
文摘In order to re-examine some trends related to tropical cyclones（TCs） over the western North Pacific since 1949,the unreliable maximum sustained wind(V;) recorded in the 1949-1978 TC best-track data from the Shanghai Typhoon Institute was modified based on the wind-pressure relationships（WPRs） in this study. Compared to the WPR scheme based on the cyclostrophic balance,the WPR scheme based on the gradient balance could give a better fit to TCs under higher wind speeds and could introduce smaller estimated errors for TCs locating at higher latitudes as well as TCs landing on the continent.After the V;modification based on minimum sea-level pressure and TC center latitude,the revised annual number of category 4-5 typhoons shows no long-term trend,while the potential destructiveness measured by power-dissipation index decreases slightly,and this trend is not significant in the period 1949-2008.
