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《JOURNAL OF GLACIOLGY AND GEOCRYOLOGY》 2000-01
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Characteristics of Stable Isotope in Precipitation in the inland Area ——A case study of the relation betweenδ~(1 8)O in precipitation and temperature in ürümqi River, China

YAO Tan-dong;SUN Wei-zhen;PU Jian-chen;TIAN Li-de;JIAO Ke-qin (Laboratory of Ice Core and Cold Regions Environment, Cold and Arid Regions Environmental and Engineering Research Institute , CAS, Lanzhou Gansu 730000, China)  
The relationship between δ~(1 8)O in precipitation and temperature is discussed based on the study at the three precipitation sampling sites in the ürümqi River Basin: ürümqi City in the lower reaches, Yaojin Bridge in the middle and Daxigou at the upper reaches of the ürümqi River. The relationship between δ~(1 8)O in precipitation and temperature is δ~(1 8)O(‰) (for initial temperature of a precipitation) and δ~(1 8)O(‰)=0.46t-14.11 (for final temperature of a precipitation) at UrUmqi City, δ~(1 8)O(‰)=0.66t-13.81 (for initial temperature of a precipitation event) and (for final temperature of a precipitation event) in Yao im Bridge, δ~(1 8)O(‰)= 0.73t-12. 17 (for initial temperature of a precipitation event) and δ~(1 8)O(‰)= 0.77t-10.39 (for final temperature of a precipitation event ) at Daxigou, respectively. 618O in precipitation in the Urhmqi River Basin also shows an altitude effect. The positive correlation between hi8O and temperature reveals that is a reliable indicators of temperature. The poor relation between 618O and temperature at Yaojin Bridge in the middle of the basin and Daxigou at the upper reaches of the basin compared with that at Urumqi City, can be attributed to the increasing local convective precipitation in the upper reaches of the basin. Nevertheless, from the seasonal variation, the relationship between and temperature is better at Yaojin Bridge and Daxigou than that at Urumqi City, indicating that b18O becomes more sensitive to temperature with the approaching of the glaciated areas.
【Fund】: 中国科学院天山冰川观测试验站基金!96-3
【CateGory Index】: P426.65
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