The altitude effect of δ 18O in precipitation and river water in the Southern Himalayas |
| |
| Authors: | Wen Rong Tian LiDe Weng YongBiao Liu ZhongFang Zhao ZhongPing |
| |
| Institution: | [1]Key Laboratory of Tibetan Environment Changes and Land Surface Processes, Institute of Tibetan Plateau Research, Chinese Academy of Sciences, Beijing 100085, China [2]Graduate University of Chinese Academy of Sciences, Beijing 100049, China [3]State Key Laboratory of Cryosphere Sciences, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000, China [4]Tianjin Key Laboratory of Water Environment and Water Resource, Tianjin Normal University, Tianjin 300387, China |
| |
| Abstract: | The lapse rate of water isotopes is used in the study of the hydrologic cycle as well as in the estimation of uplift of the
Tibetan Plateau. The greater elevation contrast in the Southern Himalayas allows for a detailed discussion about this lapse
rate. We analyze variations of δ
18O in precipitation and river water between 1320 m and 6700 m elevations in the Southern Himalayas, and calculate the specific
lapse rate of water δ
18O. The results show that the multi-year average lapse rate in precipitation over this region is 0.15‰/100 m. The one-year
average lapse rate is 0.17‰/100 m from three sites along the Southern Himalayas. The two results agree, but are much lower
than the global average of 0.28‰/100 m. This work also shows that there is a difference in precipitation δ
18O lapse rate between the monsoon and non-monsoon seasons. The calculated precipitation lapse rate is much lower than that
in surface water. |
| |
| Keywords: | δ18O precipitation river water isotopic lapse rate southern Himalayas |
| 本文献已被 CNKI 维普 SpringerLink 等数据库收录！ |
|
