River discharge changes in the Qinghai-Tibet Plateau |
| |
Authors: | Jianting Cao Dahe Qin Ersi Kang Yuanyuan Li |
| |
Affiliation: | (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 |
| |
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. |
| |
Keywords: | global warming variation of river discharge Mann-Kendall test hydrological cycle Qinghai-Tibet Plateau. |
本文献已被 CNKI 维普 万方数据 SpringerLink 等数据库收录! |
| 点击此处可从《科学通报(英文版)》浏览原始摘要信息 |
|
点击此处可从《科学通报(英文版)》下载全文 |
|