热带高度场的振荡与厄尔尼诺现象  

THE OSCILLATION OF TROPICAL HEIGHT FIELD AND EL NINO EVENTS

作　　者：罗树森 李凤临 

机构地区：[1]国家气象局气象科学研究院 [2]国家气象局国家气象中心

出　　处：《应用气象学报》1990年第4期434-442,共9页Journal of Applied Meteorological Science

摘　　要：本文使用美国国家气候资料中心1946—1978年月平均海温值和美国世界月气候资料1964—1984年月气压高度值,分析研究热带高度场的长期振荡特征及其与厄尔尼诺的关系,发现南美洲、北美洲、北非洲、太平洋等热带地区的850—30hPa 月气压高度值存在准三年振荡。厄尔尼诺现象出现后1—3个月,500—30hPa 热带月气压高度距平值从负值变为正值,反厄尔尼诺现象出现后1—2个月,热带500—30hPa 月气压高度距平值从正值变为负值。全球热带气压高度场变化最敏感的地区是塔希堤站。The monthly SST data set from the National Climate Data Centre (U.S.A.)during the 33Years periods of 1946—1978 and the monthly geopotential height data set from the Monthly Cli-matic Data for the World(U.S.A.)during the 21 years periods of 1964—1984 are utilized inthis paper.It is found that the tropical monthly geopotential height values from 850 through 30.hPa in both South and North America and North Africa,as well as over the Pacific Ocean appearthe quasi-triennial oscillation and that one to three months after thd E1 Nino events,tropicalmonthly isobaric height departures from 500 through 30 hPa change from negative to positivevalues,on the contrary,one to two months after the EL Nino,from positive to negative values.The most sensitive region of the global tropical isobaric heigt field is at Tahiti station.

关 键 词：高度场 距平 气候资料 月平均 墨西哥湾暖流 海温 北太平洋 赤道地区 北印度洋 季风区 

分 类 号：P4[天文地球—大气科学及气象学]