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《Chinese Agricultural Science Bulletin》 2015-22
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Precipitation Patterns During 1961-2013 in the Area of Southern Qinghai Lake

Yan Rong;Guo Shousheng;An Guanghui;Xiao Jianshe;Zhang Haijing;Gonghe Meteorology Bureau of Qinghai Province;Huzhu Meteorology Bureau of Qinghai Province;Qinghai Institute of Meteorology Sciences;  
The study aims to fully understand the spatial-temporal pattern of climate change around of QinghaiLake, furthermore, to reduce the deficiency in understanding the dynamic process of climate change in the areaof Qinghai Lake basin and its surrounding areas under the condition of warming in Qinghai-Tibet Plateau.Daily and monthly rainfall data from 1961 to 2013 at five weather stations in the south region of Qinghai Lakewere used in this paper, annual and seasonal precipitation data, as well as the precipitation days in differentlevels were analyzed by linear regression and moving average method. We also tested the mutation ofprecipitation by Mann- Kendall method. The results showed that the annual rainfall had a weak increasingtrend with a growth rate of 4.42 mm per decade in the studied area in 1961-2013, it was mainly contributed by the precipitation trend in summer, spring and autumn. The tendency of precipitation showed a clear increase inspring, summer and winter except autumn, and precipitation increase in summer was more obvious. The mostwide rainfall amplitude appeared in summer, and then in autumn, spring and winter as a sequence. The amountand intensity of rainfall tended to increase in the summer half year, with a decrease trend of light rain days andan increase trend of both days and amount of moderate rain. However, in the winter half year, snow days of lightsnow declined but the intensity increased. Our analysis indicated that among the different levels ofprecipitation, there was an increased trend of days and amount of moderate rain, while there was a decreasedtrend of light rain days, amount and intensity. Precipitation mutation test indicated that two mutations occurredin 1976 and 2004 for average annual rainfall, it experienced an obvious change from rainy period into dryperiod in 1976 with a difference of average annual rainfall of 158.4 mm, in contrast, the precipitation showed achange from dry to rainy after 2004 mutation with a difference of 95.5 mm.
【Fund】: 国家公益性行业(气象)科研专项“青藏高原融雪与降雪过程镶嵌的雪灾动态预报预警技术研究”(GYHY201306054);; 国家自然科学基金项目“积雪变化下青海南部高原高寒草甸土壤有机碳分解与微生物属性的关联”(41173085) “青藏高原植被变化空间异质性及其对气候变暖响应的模拟”(41173085 41061002)
【CateGory Index】: P468.024
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