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中文摘要: 本文根据1966—1989年的资料,分析了北半球总云量的季节性和非季节性变化特征。结果表明:北半球存在北太平洋和北大西洋两个年平均云量的多云区和一个北非少云区;平均云量有东西向涛动,年平均云量最多的地区正好是云量年际变化最小的地区;从冬到夏云区位置有明显的季节变化;高纬地区夏半年逐月增加,而冬半年逐月减少;中低纬少云区的北移和南退与500hPa副热带高压脊的北上和南撤密切相关。
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Abstract:In this paper, the seasonal and non-seasonal features of the total cloud amount over Northern Hemisphere are analysed based on the data from 1966 to 1989. It is shown that the Northern Hemisphere has got two areas with bigger cloud amount, which are situated in the North Pacific and North Atlantic respectively, and also got one area with smaller cloud amout in the Northern Africa., The annual mean cloudness appears east-west oscillation. The areas with the bigger cloudness are just the areas with slighter interannual variability. And the position of the cloud areas vary obviously seasonally from winter to summer.The cloud amount in the high latitudes gradually increases from one month to another in the summer half year and decreases in the winter half year.The northerly and southerly moving of the areas with smaller cloud amount in the mid-lower latitudes is closely related to the northerly and southerly moving of the ridge at 500hPa subtropical high.
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引用文本：
陈桂英,李小泉,1991.北半球云量的空间分布和季节变化特征[J].气象,17(2):3-8.
,1991.Some features of spatial distribution and seasonal variation of cloudness over Northern Hemisphere[J].Meteor Mon,17(2):3-8.
陈桂英,李小泉,1991.北半球云量的空间分布和季节变化特征[J].气象,17(2):3-8.
,1991.Some features of spatial distribution and seasonal variation of cloudness over Northern Hemisphere[J].Meteor Mon,17(2):3-8.