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INTENSITY CHANGE CHARACTERISTICS OF TROPICAL CYCLONES IN THE WESTERN NORTH PACIFIC AS REVEALED BY THREE DIFFERENT DATASETS 总被引：2，自引：1，他引：1
Analyzed in this paper are the 20-yr(1991-2010)tropical cyclone(TC)intensity from three forecast centers in the Western North Pacific,i.e.China Meteorological Administration(CMA),Japan Meteorological Agency(JMA),and Joint Typhoon Warning Center(JTWC)of the United States.Results show that there is more or less discrepancy in the intensity change of a TC among different datasets.The maximum discrepancy reaches 22 hPa/6h(42 hPa/6h,33 hPa/6h)between CMA and JMA(CMA and JTWC,JMA and JTWC).Special attention is paid to the records for abrupt intensity change,which is currently a difficult issue for forecasters globally.It is found that an abrupt intensity change process recorded by one dataset can have,in some extreme cases,intensity change in another dataset varying from 0 to≥10 hPa/6h with the same sign or the opposite sign.In a total of 2511 cases experiencing rapid intensity change,only 14%have consensus among all the three datasets and 25%have agreement between two of the three datasets.In spite of such a significant uncertainty,the three datasets agree on the general statistical characteristics of abrupt intensity change,including regional and seasonal distribution,the relationship with initial intensity and TC moving speed,and persistence features.Notable disagreement is on very strong systems(SuperTY)and TCs moving very fast. 相似文献
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利用1996-2010年的卫星红外云顶亮温(TBB)资料,研究经过台湾海峡的热带气旋(TC)内核深对流活动特征。根据TC受台湾岛影响的大小分为远海区域、登陆前近海区域、台湾岛区域和海峡区域4个阶段。分析发现,穿越台湾岛进入海峡区域的TC内核结构趋于松散,深对流系统的总面积较远海和近海区域TC小,但深对流系统个数较前期显著增加,活动位置远离TC中心。海峡区域的水体虽然有利于TC内核深对流系统在一定程度上的恢复发展,但并不能明显促进极端强对流系统的加强发展。位于台湾岛和海峡区域TC的深对流系统活动具有明显的非对称特征,特别是海峡区域TC的热塔分布,在TC前进方向左后侧出现的概率最高,超过了半数。 相似文献
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