The variation of cloud amount and light rainy days under heavy pollution over South China during 1960-2009.

Actually, similar studies have previously shown an increasing trend of precipitation over South China and a decreasing trend over North China, and this pattern of change has been called the “south wet/north drought” phenomenon (Gong and Ho 2002 ; Hu et al. 2003 ).

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For small rainy days, all the stations showing a decreasing trend, and 52.6% of them pass the 0.01 significance level.

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