Characteristics analysis of time serial of rainfall in the northern part of Haihe River Basin from 1956 to 2012
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Abstract:
The annual precipitation time series of 20 climate stations in the northern part of Haihe River Basin from 1956 to 2012 were analyzed in this paper. The spatial and multi-temporal characteristics of the rainfall were analyzed from the aspects of trend test, period analysis, breakpoint detection and spatial heterogeneity analysis. The results showed that: (1) the rainfall of the northern part of Haihe River Basin decreased by 14.9mm per ten years; (2) rainfall of different time scales had significantly different characters: the monthly rainfall was steady, with rainfall in October and November decreasing significantly and that in May and June increasing significantly; the rainfall in spring and autumn were relatively stable and the decline in summer and winter were of significance; the annual rainfall were of 28 years period and switched from wet season to dry season in around 1980s. (3) annual rainfall in mountain areas reduced at a rate twice as quick as that in plain areas, but had more solid period and earlier breakpoint.
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