摘要
利用ＥＣＭＷＦ提供的９ａ（１９８Ｏ－１９８８）资料，从定性和定量角度分析５００ｈＰａ全球东西风带的角动量和ＥＰ通量的季节过渡。结果发现：不仅角动量存在明显的季节性急变，而且反映波活动的ＥＰ通量也存在相应的季节性急变。另外，季节性急变的发生时间在东西风带亦有所不同。
Utilizing the daily data set from ECMWF for nine years of 1980-- 1988, the seasonaltransition of angular momentum and EP--flux for the easterlies and westerlies in Northernand Southern Hemispheres are analyzed by qualtitative and quantitative means. The following resuhs are found:(1) In the westerlies, there are remarkable seasonal rapid changes happened generally inApril and in October. and this phenomenon in Northern Hemisphere is more obvious thanthat in Southern Hemisphere.(2) In the easterlies, there is a sudden change occuring in June over Northern Hemisphere. yet over Southern Hemisphere the seasonal transition of the easterlies is not obvious.On the basis of this evidence the difference of factors affecting the rapid changes of April andJune is discussed.
出处
《气象学报》
CSCD
北大核心
1995年第2期238-246,共9页
Acta Meteorologica Sinica
基金
高等学校博士点科研基金
