热带西太平洋西风暴发的天气特征分析  

SYNOPTIC FEATURE ANALYSIS DURING WESTERLY WIND BURST OVER THE TROPICAL WESTERN PACIFIC

作　　者：吴增茂[1] 盛立芳[1] 张庆荣[2] 林锡贵[2] 蔡亲炳[2] 石志雄 张凌[3] 

机构地区：[1]青岛海洋大学青岛 [2]中国科学院南海海洋研究所 [3]中国科学院大气物理研究所

出　　处：《中国海洋大学学报（自然科学版）》1993年第S2期79-88,共10页Periodical of Ocean University of China

基　　金：国家自然科学基金(编号:49236110)

摘　　要：根据TOGA—COARE强化观测期间的资料,分析热带西太平洋西风爆发(WWB)的天气型特征。提出引发和维持WWB过程的低层流场基本有三:1.北半球南下冷源与SE信风结合型;2.北半球南下冷气流与SPCZ上的热带气旋结合型;3.南北取向由双气旋构成的偶极子型流场。指出该偶极子相对稳定在更日线附近,并解释了这一事实存在的原因。还讨论了WWB的多时间尺度性,以及WWB过程中气象要素场变化特征等问题。In this paper, discussed and analysed are the synoptic features of westerly wind burst (WWB) over the tropical western Pacific, based on the intensive observation data of tTOGA-COARE. It is presented that the low -level stream fields which trigger and maintain the WWB process can be classified into three basic patterns: (1) cold surge from the northern hemisphere combines with the southeast trade wind (2)cold air from the northern hemisphere comines with tropical cyclones on SPCZ and (3) a North - South double - cyclone dipole. It is pointed out that the double -cyclone dipole possesses a relatively stationary position at the date line, and this can be explained with the pattern of the monthly mean wind. The multiple - scale features and variation of meteorological element fields of the WWB process are also discussed.

关 键 词：西太平洋暖池 西风爆发 天气特征分析 气旋对偶极子 

分 类 号：P7[天文地球—海洋科学]