Climatic Characteristic and Change of Rain Day for Different Intensities in Yunnan

PENG Gui-feng1,LIU Yu2(1.Yunnan Meteorological Observatory,Kunming 650034,China;2.Climate Center of Yunnan,Kunming 650034,China)  

Using the data of 125 weather stations in Yunnan Province form 1959 to 2005,and the modern statistic diagnosablemethod of counting the trend-coefficient, the rain-day,moderaterain-day,heavy-day,rainstorm-day,heavy rainstorm-day and climatic characteristic and change each magnitude precipitation in Yunnan Province are researched.The results indicate that, there is an obvious difference between dry and rainy seasons from moderate to heavy rainfall in Yunnan Province.In the rainy season,the moderate rain-day,heavy rain-day,rainstorm-day and heavy rainstorm-day accounts for 84%,90%,94%,99%,respectively of the whole year.In particular,the heavy rain-day of June,July,and August take up more than 61% of the whole year.There is a high concentration for the severe rain-day,but the larger the rainfall magnitude,the higher the concentration.The heavy rain-day,rainstorm-day,heavy rainstorm-day are increasing.Furthermore,the increasing trend of the heavy rainstorm-day is the most remarkable,more than that of rainstorm-day and the heavy rain-day.Meanwhile the rain-day and the moderaterain-day are decreasing,and the decreasing trend of rain-day is quite obvious.On average of 10 years,the heavy rain-day increased by 6.9 days,the rainstorm-day increased by 4.3 days,and the heavy rainstorm-day increased by 0.7 days,while the moderaterain-day decreased by 75.4 days,and the average rain-day decreased for 7.6 days.There is a reductive trend on the annual precipitation of Yunnan Province,but it is not remarkable,which decreased by 15.3 mm per year.Meanwhile,The precipitation of heavy rain,rainstorm and heavy rainstorm increased slightly,but not remarkable also.Instead,that of light rain and moderaterain decreased remarkable.

【Fund】： 中国气象局新技术推广应用项目(CMATG2006M45);; 云南省科技攻关及高新技术计划(2006SG25)共同资助
【CateGory Index】： P467

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