| River discharge changes in the Qinghai-Tibet Plateau |
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| 作者姓名： | CAO Jianting QIN Dahe KANG Ersi LI Yuanyuan |
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| 作者单位： | [1]Laboratory for Climatic Studies, China Meteorological Administration Beijing 100081, China [2]General Institute for Water Resources and Hydropower Planning and Design, Ministry of Water Resources, Beijing 100011, China [3]China Meteorological Administration, Beijing 100081, China [4]Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences. Lanzhou 730000, China |
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| 基金项目： | Acknowledgements The authors would like to thank the anonymous reviewers for their helpful opinion. This work was supported by the Special Foundation for Climatic Change Study, China Meteorological Administration. |
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| 摘 要： | THE QINGHAI-TIBET PLATEAU IS SENSITIVE TO GLOBAL CLI- MATE CHANGES, AND ITS MEAN WARMING AMPLITUDE DURING THE PAST 50 YEARS IS GREATER THAN THAT OF THE NORTHERNHEMISPHERE AND OTHER REGIONS IN THE SAME LATITUDE1,2]. DUE TO ITS SPECIFIC GEOMORPHIC CONDITIO…
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| 关 键 词： | 河流流量 曼-肯德尔试验 水循环 青藏高原 全球变暖 |
| 收稿时间： | 2005-06-10 |
| 修稿时间： | 2005-06-102005-07-29 |
River discharge changes in the Qinghai-Tibet Plateau |
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| CAO Jianting QIN Dahe KANG Ersi LI Yuanyuan.River discharge changes in the Qinghai-Tibet Plateau[J].Chinese Science Bulletin,2006,51(5):594-600. |
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| Authors: | Jianting Cao Dahe Qin Ersi Kang Yuanyuan Li |
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| Institution: | (1) Laboratory for Climatic Studies, China Meteorological Administration, Beijing, 100081, China;(2) General Institute for Water Resources and Hydropower Planning and Design, Ministry of Water Resources, Beijing, 100011, China;(3) China Meteorological Administration, Beijing, 100081, China;(4) Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou, 730000, China |
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| Abstract: | Annual mean discharge data of the five large rivers in the exorheic region of the Qing- hai-Tibet Plateau from 1956 to 2000 are analyzed for trends with the Mann-Kendall nonparametric trend test. The results reveal that though in general no in- creasing trends exist in the total river discharges, significant regional differences of river discharge ex- ist, reflecting the decreasing trends of discharge in the Yellow River and the Tongtian River (upper Changjiang River), an increasing trend in Yalong River, and inverted change in the Lancang River and Yarlung Zangbo River. Based on analyses of the seasonal discharge, it is found that climatic change had a significant effect on the seasonal variation of river discharge in the Qinghai-Tibet Plateau. In spring (from March to May) the discharge increased signifi- cantly, especially in the source area of the Yellow River. Together with the analyses on data of the mean temperature in the Northern Hemisphere and climatic data within the river basins, the relationship between discharges and mean temperature of the Northern Hemisphere is explored, which indicates that there is no increase in the stream discharge in the Qinghai-Tibet Plateau with global warming. It is probably the increasing evaporation, caused by rising temperature that offsets the hydrological effect of increasing precipitation. |
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| Keywords: | global warming variation of river discharge Mann-Kendall test hydrological cycle Qinghai-Tibet Plateau |
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