孙安健,宋连春,何素兰,唐国利. 1991. 80年代北半球夏季大气环流遥相关的年际变化的研究[J]. 气象学报, 49(4):559-563, doi:10.11676/qxxb1991.071 |
80年代北半球夏季大气环流遥相关的年际变化的研究 |
INTERANNUAL CHANGE IN TELECONNECTIONS OF GENERAL CIRCULATION IN SUMMER DURING 1980’S OVER THE NORTHERN HEMISPHERE |
投稿时间:1989-06-01 修订日期:1990-02-21 |
DOI:10.11676/qxxb1991.071 |
中文关键词: |
英文关键词: |
基金项目:国家自然科学基金 |
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中文摘要: |
近年来的许多观测事实表明,全球大气环流的变化存在着相关性.Wallace和Gutzler[1]发现大气环流的异常存在着五种遥相关型:太平洋北美型,西大西洋型,东大西洋型,西太平洋型和欧亚型.黄荣辉[2]从理论和数值试验方面指出,冬季热带东太平洋海温的异常会引起中高纬度大气环流的异常.黄荣辉等人[3]近期的研究还揭示出夏季热带西太平洋海温的异常,会在东南亚、东亚与太平洋北美地区形成一个类似PNA型的大气环流遥相关型,并称之为东亚太平洋型. |
英文摘要: |
In this paper 5°×100 latitude-longitude grid point data of daily 500 hPa geopotential height over the Northern Hemisphere in Summer (June-August during 1980's are used. The conclusions can be drawn as follows:1. Summer heat source anomaly of tropical western Pacific causes anomaly of summer general circulation over the Northern Hemisphere. Teleconnection of general circulation similar to PNA pattern was formed from Southeastern Asia, East Asia to North American. 2. During the year of peak period of an El Nino event such as 1980,1983 and 1987, the subtropical high of western Pacific was significantly strengthened in summer and the ridge line and point were moved to the south and west than the normal respectively. It causes plentiful rainfall along the Chang Jiang and the Huai He river basins in summer. 3. During the year of peak period in a counter-E1 Nino event such as 1985,the intensity of subtropical high of western Pacific in summer was near the normal, but the ridge line was located in the north of the normal as well as the ridge point withdrew intensely eastward. It causes severe drought along the Chang Jiang and the Huai He river basins in summer. |
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