Comparison and Spatial-temporal Variability of Daily Precipitation Data of Weather Stations and Rain Gauges in Haihe River Basin
Received date: 2009-01-13
Revised date: 2009-05-26
Online published: 2009-09-25
Supported by
National Natural Science Foundation of China, No.40730632;The Knowledge Innovation Program of the Chinese Academy of Sciences, No.KZCX2-YW-126;National Key Technology R&D Program, No.2006BAB14B07-01
In this paper, the precipitation data from 30 weather stations for 1958-2007 and 248 rain gauges for 1995-2004 are examined and compared using linear regression, 5-year moving average, Mann-Kendall trend analysis, Kolmogorov-Smirnov test, Z test and F test methods; the WS data are used to extend the short record of RG data series; the temporal and spatial variations of precipitation in the Haihe River basin are studied. The results show that: (1) The precipitation of 1958-2007 has been decreasing except for the spring. The decline trend is significant in summer, and this trend is stronger after the 1980s; (2) The annual precipitation from both WS and RG records are normally distributed, with minor difference in the mean value and variance. In addition, their correlation degrees are higher, and it is statistically feasible to extend the precipitation of RG by weather station precipitation; (3) The temporal and spatial patterns of summer and annual precipitation in the Haihe River Basin are similar: in the piedmont of the Taihang Mountains and Yanshan Mountains there exists a rainfall rich zone, while on the leeward slope of the mountains and in the plain area there is less rainfall. In addition, the rainfall declines from the south to the north, and from the coast to the inland; winter sees the least water vapor and less precipitation in the north than in the south; while spring and autumn often witness a transition from winter to summer. In recent 50 years, the declining trend is most significant around the Wutaishan station, as well as some regions in the piedmont, and the changing trends are different in different seasons.
Key words： Haihe River Basin; climate change; precipitation; MK method; Kolmogorov-Smirnov test; Z test; F tes
CHU Jian-ting,XIA Jun,XU Chong-yu,LI Lu,WANG Zhong-gen . Comparison and Spatial-temporal Variability of Daily Precipitation Data of Weather Stations and Rain Gauges in Haihe River Basin[J]. Acta Geographica Sinica, 2009 , 64(9) : 1083 -1092 . DOI: 10.11821/xb200909006
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