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Spatiotemporal variations of precipitation regimes across Yangtze River Basin,China |
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| Authors: | Qiang Zhang Juntai Peng Chong-Yu Xu Vijay P Singh |
| Institution: | 1. Department of Water Resources and Environment, Sun Yat-sen University, Guangzhou, 510275, China 2. Key Laboratory of Water Cycle and Water Security in Southern China of Guangdong High Education Institute, Sun Yat-sen University, Guangzhou, 510275, China 3. School of Geography and Planning, and Guangdong Key Laboratory for Urbanization and Geo-simulation, Sun Yat-sen University, Guangzhou, 510275, China 4. Department of Geosciences, University of Oslo, P.O. Box 1047, Blindern, 0316, Oslo, Norway 5. Department of Biological & Agricultural Engineering and Department of Civil and Environmental Engineering, Texas A & M University, College Station, TX, 77843-2117, USA |
| Abstract: | Daily precipitation data during the period of 1960 to 2005 from 147 rain gauging stations over the Yangtze River Basin are analyzed to investigate precipitation variations based on precipitation indices and also consecutive rainfall regimes in both space and time. Results indicate decreasing annual/monthly mean precipitation. Distinct decreases in rainfall days are observed over most parts of the Yangtze River Basin, but precipitation intensity is increasing over most parts of the Yangtze River Basin, particularly the lower Yangtze River Basin. Besides, durations of precipitation regimes are shortening; however, the fractional contribution of short-lasting precipitation regimes to the total precipitation amount is increasing. In this sense, the precipitation processes in the Yangtze River Basin are dominated by precipitation regimes of shorter durations. These results indicate intensified hydrological cycle reflected by shortening precipitation regimes. This finding is different from that in Europe where the intensifying precipitation changes are reflected mainly by lengthening precipitation regimes, implying different regional responses of hydrological cycle to climate changes. The results of this study will be of considerable relevance in basin-scale water resources management, human mitigation of natural hazards, and in understanding regional hydrological responses to changing climate at regional scales. |
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