Changing properties of precipitation concentration in the Pearl River basin, China |
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| Authors: | Qiang Zhang Chong-yu Xu Marco Gemmer Yongqin David Chen Chunling Liu |
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| Institution: | (1) Institute of Space and Earth Information Science, The Chinese University of Hong Kong, Shatin, NT, Hong Kong, China;(2) Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, 210008 Nanjing, China;(3) Department of Geosciences, University of Oslo, PO Box 1047, Blindern, 0316 Oslo, Norway;(4) National Climate Center, China Meteorological Administration, 100081 Beijing, China;(5) Department of Geography and Resource Management, The Chinese University of Hong Kong, Shatin, Hong Kong, China |
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| Abstract: | In this paper, precipitation concentrations across the Pearl River basin and the associated spatial patterns are analyzed
based on daily precipitation data of 42 rain gauging stations during the period 1960–2005. Regions characterized by the different
changing properties of precipitation concentration index (CI) are identified. The southwest and northeast parts of the Pearl
River basin are characterized by lower and decreasing precipitation CI; the northwest and south parts of the study river basin
show higher and increasing precipitation CI. Higher but decreasing precipitations CI are found in the West and East River
basin. Comparison of precipitation CI trends before and after 1990 shows that most parts of the Pearl River basin are characterized
by increasing precipitation CI after 1990. Decreasing precipitation CI after 1990 (compared to precipitation CI changes before
1990) is observed only in a few stations located in the lower Gui River and the lower Yu River. Significant increasing precipitation
CI after 1990 is detected in the West River, lower North River and upper Beipan River. These changes of precipitation CI in
the Pearl River basin are likely to be associated with the consequences of the well-evidenced global warming. These findings
can contribute to basin-scale water resource management and conservation of ecological environment in the Pearl River basin. |
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| Keywords: | Precipitation variability Concentration index (CI) Climate trend Spatial distribution Pearl River |
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