Isotopic variation in the lake water balance at the Yamdruk‐tso basin, southern Tibetan Plateau

Hydrological Processes - Tập 22 Số 17 - Trang 3386-3392 - 2008
Lide Tian1,2, Zhongfang Liu1, Tongliang Gong3, Changliang Yin2, Wusheng Yu1, Tandong Yao1,2
1Laboratory of Environmental Processes, Institute of Tibetan Plateau Research, Chinese Academy of Sciences, Beijing 100085, People's Republic of China
2State Key Laboratory of Cryosphere Sciences, Cold and Arid Region Environmental and Engineering Research Institute, CAS, Lanzhou 730000, People's Republic of China
3Tibet Institute of Water Resource Survey Planning Design and Research, Lhasa 850000, Tibet

Tóm tắt

AbstractThe use of stable isotopes is a practical tool in the study of the lake water budget. This is an one way to study the hydrological cycle in the large numbers of inland lakes on the Tibetan Plateau, in which the isotope record of the sediment is believed to reflect the climatic and environmental changes. The monitoring of stable isotopes of the precipitation, river and lake waters during 2004 in the inland Yamdruk‐tso basin, southern Tibetan Plateau, reveals the lake water δ18O is over 10‰ higher than the local precipitation. This high difference indicates strong isotope enrichment due to lake water evaporation. The simulation results based on the isotope technique show that the present lake water δ18O level corresponds to an average relative humidity of around 54–58% during evaporation, which is very close to the instrumental observation. The simulation results also show that the inland lakes on the Tibetan Plateau have a strong adjustability to the isotope shift of input water δ18O. On average, the isotope component in the inland lake water is to a large extent controlled by the local relative humidity, and can also be impacted by a shift of the local precipitation isotope component. This is probably responsible for the large consistence in the isotope component in the extensive inland lakes on the Tibetan Plateau. Copyright © 2008 John Wiley & Sons, Ltd.

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Hydrological Processes

Tập 22 Số 17

3386-3392

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