| 西藏扎布耶盐湖30.0 ka B P以来水位与古降水量变化 |
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| 关键词:Late Pleistocene hydrological balance evaporation precipitation |
| 基金项目:国家自然科学基金重点项目(编号:49833010) ;科技部公益性基础研究课题(编号:2001DIA10020) |
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| Precipitation Fluctuation since 30.0 ka B P at Chabyer Caka, Western Tibet |
| The 9 steps of large-sized sand banks at Chabyer Caka of western Tibet plateau have recorded the lake level fluctuations since 30 ka B P. The sediments in the mountain valley river pass have provided us with information about the departure history of Chabyer Caka from north Laggor Co and south Taro Co lakes. Using DEM in GIS, the authors computed the area, volume and salinity of the paleolake and the area of the lake basin corresponding to each period of sand banks. Other researchers' study of lake sediments, glacier and flora also provide us with possible conditions of temperature and insolation during the past 30 ka. Using the above parameters and based on the hydrological balance equation of the drainage basin, the authors developed a more credible models than the Kutzbach hydrological-energy balance model by introducing a more accurate calculating model of the land evaporation, with the purpose of exploring the relationship between the rainfall and the lake area. The model yields a precipitation estimate of 567 mm/yr for Late Pleistocene (40-28 ka B P), and 350 mm/yr for Last Glacial Maximum. The precipitation rose to 402 mm/yr after LGM, and dropped to 280 mm/yr at about 3.53 ka B P. By reconstruction of past rainfall since Late Pleistocene we can understand the pale-o-environment and monsoon evolution in Tibetan plateau quantitatively. |
| QI Wen,ZHENG Mian-ping.2005.Precipitation Fluctuation since 30.0 ka B P at Chabyer Caka, Western Tibet[J].Acta Geoscientica Sinica,26(1):53-60. |
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