期刊
CHINESE SCIENCE BULLETIN
卷 56, 期 4-5, 页码 406-415出版社
SCIENCE PRESS
DOI: 10.1007/s11434-010-4278-x
关键词
delta D; delta O-18; moisture sources; surface runoff; headwaters of the Heihe River basin
资金
- National Natural Science Foundation of China [91025016]
- West Light Foundation of Western Doctors of the Chinese Academy of Sciences
- Chinese Academy of Sciences [KZCX2-XB2-04-03]
- China Postdoctoral Science Foundation [200801244, 20070420135]
We investigated the moisture origin and contribution of different water sources to surface runoff entering the headwaters of the Heihe River basin on the basis of NECP/NCAR (National Centers for Environmental Prediction/National Center for Atmospheric Research) re-analysis data and variations in the stable hydrogen and oxygen isotope ratios (delta D and delta O-18) of precipitation, spring, river, and melt water. The similar seasonality in precipitation delta O-18 at different sites reveals the same moisture origin for water entering the headwaters of the Heihe River basin. The similarity in the seasonality of delta O-18 and d-excess for precipitation at Yeniugou and Urumchi, which showed more positive delta O-18 and lower d-excess values in summer and more negative delta O-18 and higher d-excess values in winter, indicates a dominant effect of westerly air masses in summer and the integrated influence of westerly and polar air masses in winter. Higher d-excess values throughout the year for Yeniugou suggest that in arid inland areas of northwestern China, water is intensively recycled. Temporal changes in delta O-18, delta D, and d-excess reveal distinct contributions of different bodies of water to surface runoff. For example, there were similar trends for delta D, delta O-18, and d-excess of precipitation and river water from June to September, similar delta O-18 trends for river and spring water from December to February, and similar trends for precipitation and runoff volumes. However, there were significant differences in delta O-18 between melt water and river water in September. Our results show that the recharge of surface runoff by precipitation occurred mainly from June to mid-September, whereas the supply of surface runoff in winter was from base flow (as spring water), mostly with a lower runoff amount.
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