Temporal and Spatial Distribution of Heavy Precipitation Over Tibetan Plateau in Recent 48 Years
Temporal and Spatial Distribution of Heavy Precipitation Over Tibetan Plateau in Recent 48 Years
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发表时间：
2011
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通讯作者：
Wu Ping
中科院分区：
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作者：
Wu Ping
利用青藏高原48个测站1961 - 2008年逐日降水资料，分析了高原夏半年和冬半年强降水的时空分布特征，结果表明：高原夏半年强降水的空间分布与高原总降水的空间分布非常相似，都是由东南向西北递减，夏半年强降水具有准3年、准6年的年际振荡周期和准10-11年的年代际振荡周期，冬半年有6-7年的周期和准15年的年代际周期，降水趋势在空间分布上有很大差异，夏半年，青藏高原夏半年强降水总体呈弱的减少趋势，而雅鲁藏布江冬半年则呈增加趋势，1976年出现了降水突变。
Based on the daily precipitation data of 48 stations over the Tibetan Plateau from 1961 to 2008,the characteristics of spatial and temporal distribution during the summer and winter half years over the Plateau are analyzed.It is shown that the spatial distribution of strong precipitation is very similar to that of the total precipitation over the Plateau,which decreases from southeast to northwest during the summer half year,while declines from the hinterland of the Plateau located in the east of Tanggula Mountains to the surrounding during the winter half year.The heavy precipitation during the summer half year has inter-annual oscillation cycle with quasi-three years,quasi 6 years and decadal oscillation cycle with quasi 10-11 years,while has the cycle with 6-7 years and decadal cycle with quasi 15 years during the winter half year.The trend of heavy rainfall is quite different in spatial distribution.During the summer half year,it increases(decreases) in most regions over the northern(southern) Plateau.The overall heavy precipitation of the Tibetan Plateau shows a weak decreasing trend during the summer half year and an increasing trend in the Yarlung Zangbo River during the winter half year.There was an abrupt change of precipitation in 1976.