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Statistics and trend of precipitation variation in Weichang |
Wang Shulan |
Weichang Meteorological Bureau of Chengde,Chengde 068450 |
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Abstract Based on daily precipitation data in Weichang from 1951 to 2010,precipitation variation of each season in recent 60 years has been made a statistics.The resultsshow that the annual precipitation in Weichang presents a downtrend with -4.895 mm/10 a climate trend rate according to annual change.The mean annual precipitation in 1950s,1960s,1970s and 1980s occupies first,second,third and last place respectively.As the same time,the precipitation is also less than normal in the nearest ten years(2001-2010) and the mutation of annual precipitation do not exist.The trendof precipitation variation is influenced by seasonal change.The downtrend of average precipitation can be observed in summer and winner,especially in summer with -9.9 mm/10 a climate trend rate.However,the precipitation presents an uptrendin the fall and spring.The mutation of seasonal precipitation mainly appears in summer and the other seasons show unobvious mutation.The days of mean annual precipitation of Weichang in recent 60 years show downtrend with the affectof annual change.Except for slightly increasing of rainstorm days,the days of light rain,moderate rain and heavy rain are all present decreasing trend.The reduction of light rain days is the most obvious.
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Received: 08 June 2012
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