Re-examination of Trends Related to Tropical Cyclone Activity over the Western North Pacific Basin  

作　　者：宋金杰 韩珏靖 李思佳 王元 吴立广 

机构地区：[1]Key Laboratory of Mesoscale Severe Weather/MOE,and School of Atmospheric Sciences,Nanjing University [2]Key Laboratory of Meteorological Disaster of Ministry of Education,Nanjing University of Information Science and Technology

出　　处：《Advances in Atmospheric Sciences》2011年第3期699-708,共10页大气科学进展（英文版）

基　　金：National Basic Research Program of China(973 Program, 2009CB421502);the National Natural Science Foundation of China(Grant Nos.40830958,40730948,and 90715031).

摘　　要：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.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_（max）） 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_（max） 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.

关 键 词：tropical cyclone wind-pressure relationship gradient balance power-dissipation index 

分 类 号：P444[天文地球—大气科学及气象学] P315.5