Daily Precipitafion and Temperature Variations in Qinghai Lake Watershed in Recent 40 Years

Abstract

Abstract:

The daily precipitation(P)and temperature changes in the Qinghai Lake watemhed from 1958 to 2001 were analyzed using the records from Gangcha Meteorological Station．Results show￡Ilat the yearly total rainfall of0

Key words: daily precipitation, extreme temperature, climatic change, Qinghai Lake watershed

摘要：

利用青海湖流域内刚察气象站1958—2001年的逐日降水和气温资料，分析了流域内的气候变化特征。结果表明，日降水量P≤5 ITlln的降水总量以9 mm／10 a的速率显著减少，已从1960s的130．8 mm／a减少为1990s的116．2 mm／a，而P~>20 mm的降水总量以9 mm／10 a的速率显著增加，已
从29．7 mm／a增加为36．9 mm／a；连续无降水最长天数由1960s的32 d／a增加为1990s的45 d／a，至少10 d连续无降水总天数由103 d／a增加为145 d／a。逐年平均温度40 a来明显升高，已从1960s的一0．7 oC升至1990s的0．1 oC，且与逐年极端低温升高有较好相关性。1990s与1960s的同日平均气温相比，已有261 d变暖(占年天数的71．2％)，且主要发生在冬季。这种气候变化特征对流域内的青海湖水位和河川径流有重要影响。

关键词: 日降水, 极端温度, 气候变化, 青海湖流域

CLC Number:

P467

SUN Yong-Liang, LI Xiao-Yan, HU He-Ye. Daily Precipitafion and Temperature Variations in Qinghai Lake Watershed in Recent 40 Years[J]. Journal of Arid Meteorology, 2008, 25(1): 7-13.

孙永亮, 李小雁, 许何也. 近40 a青海湖流域逐日降水和气温变化特征[J]. 干旱气象, 2008, 25(1): 7-13.

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