| 喜马拉雅山中部过去约300年季风降水变化 |
| |
| 引用本文： | 段克勤,姚檀栋,蒲健辰.喜马拉雅山中部过去约300年季风降水变化[J].第四纪研究,2002,22(3):236-242. |
| |
| 作者姓名： | 段克勤 姚檀栋 蒲健辰 |
| |
| 作者单位： | 中国科学院寒区旱区环境与工程研究所,兰州,730000 |
| |
| 基金项目： | 中国科学院知识创新工程重要方向项目 (批准号 :KZCX2 30 1 )，国家重点基础研究发展规划项目 (批准号 :
G1 9980 4 0 80 0 )，国家自然科学基金 (批准号 :4 0 1 0 1 0 0 6 ) |
| |
| 摘 要： | 重建了1700年以来喜马拉雅山中部达索普冰芯积累量,该积累量直接反映了喜马拉雅山中部季风降水。研究了该积累量的变化规律,并分析了其与尼泊尔和印度东北部夏季风降水之间的关系,最后讨论了陆海热力差异与该积累量之间的关系。
|
| 关 键 词： | 达索普冰芯 季风降水 喜马拉雅山 |
| 收稿时间： | 2001-12-19 |
| 修稿时间： | 2001年12月19 |
MONSOON RAINFALL VARIABILITY IN CENTRAL HIMALAYA MOUNTAINS OVER THE PAST ca. 300 YEARS |
| |
| Duan\ Keqin,Yao\ Tandong,Pu\ Jianchen.MONSOON RAINFALL VARIABILITY IN CENTRAL HIMALAYA MOUNTAINS OVER THE PAST ca. 300 YEARS[J].Quaternary Sciences,2002,22(3):236-242. |
| |
| Authors: | Duan\ Keqin Yao\ Tandong Pu\ Jianchen |
| |
| Institution: | Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000 |
| |
| Abstract: | A 149.2m long ice core was drilled at the accumulation area of Dasuopu glacier (28°23′N, 85°43′E , 7?200m a.s.l.) in the central Himalaya Mountains in 1997. The ice core was analyzed continuously for stable isotopes ( δ18O), cations and anions throughout the core. Cycles indicated by δ18O, cations and anions were identified and counted as seasonal fluctuations as annual increment from minimum to maximum values. Reconstructed 295 year (1700～1995) annual net accumulation from the core reflects a major precipitation trend for the central Himalaya Mountains. Then the accumulation record is analyzed to reveal variation characteristics and associations to Indian monsoon rainfall using methods of (EOF) and singular spectrum analysis (SSA). EOF analysis show in the EOF1 associations precipitation in Himalaya Mountains and in North West India are positively correlated,and anti correlated with that in all India. In the EOF2 associations precipitation in Himalaya Mountains are positively correlated with northern Indian,and negatively correlated with southern Indian. Based on these associations,we identified distinct climatic regimes in monsoon precipitation with main changes around the year 1930. The period 1850～ 1930 is characterized by more wet years over Himalaya Mountains and by more dry years over central India,while the period 1930～1995 is characterized by more dry years over Himalaya Mountains and by more wet years over central India. The precipitation record indicates in central Himalaya Mountains dry climate occurred in early 18 th , wet condition prevailed between 1830～1930, but the accumulation has decreased to its present value after 1930. However distinct secular trends were not found in the record. For the periods 1955～1995 variability of the accumulation is found to correlate significantly with the thermal contrast between the Tibetan Plateau and the Indian Ocean surface temperature. The thermal contrast correlates more strongly with the accumulation ( r =0.42, sig.=99%) than does either Tibetan Plateau temperature ( r =0.3, sig.=95%) or Indian Ocean surface temperature (0.02). |
| |
| Keywords: | Dasuopu ice core monsoon rainfall Himalaya Mountains |
| 本文献已被 CNKI 维普 万方数据 等数据库收录！ |
| 点击此处可从《第四纪研究》浏览原始摘要信息 |
| 点击此处可从《第四纪研究》下载免费的PDF全文 |
|
