Abstract:

Collected 239 meteorology stations in Central China from 1961 to 2010,the characteristics of the precipitation in Central China were investigated based on 233 stations which passed the homogenization test as analysis object.The results showed that the precipitation trend was almost not obvious,but notable in decadal change.The precipitation in 1960s was close to normal value, higher in 1990s and less from 1970s to 1980s and in early 21st century.The zonal distribution,which was gradually decreasing from southern to northern,was much more significant,yet not uniform in spatial distribution.The decreasing trend of rain days was eminent at 3.4 days per 10 years.The regional rainfalls increased much obviously after 1989 and reduced after 2006,which possessed an oscillation period of 2 years.The rain days reduced significantly after1986.The precipitation trends during spring and autumn were completely reducing,which retained respectively the change rate of -54 and -122 mm per 10 years.Yet the summer and winter rainfall totally increased with the rate of 156 and 63 mm per 10 years.And the change rates of rain days during four seasons were separately -14 ,02,-21 and -01 days per decade