Advances in Earth Science ›› 2007, Vol. 22 ›› Issue (8): 842-850. doi: 10.11867/j.issn.1001-8166.2007.08.0842

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Influence of Moisture Transport on Stable Isotope in Precipitation

LIU Zhong-fang 1, TIAN Li-de 1,2, YAO Tan-dong 1,2, GONG Tong-liang 3, YIN Chang-liang 2   

  1. 1.Institute of Tibetan Plateau Research, CAS, Beijing 100085,China;2.Key Laboratory of Cryosphere and Environment, CAREERI, CAS, Lanzhou 730000, China;3.Institute of Tibetan Water Resource Reconnaissance and Designing, Lhasa 850000,China
  • Received:2007-03-19 Revised:2007-06-27 Online:2007-08-10 Published:2007-08-10

LIU Zhong-fang, TIAN Li-de, YAO Tan-dong, GONG Tong-liang, YIN Chang-liang. Influence of Moisture Transport on Stable Isotope in Precipitation[J]. Advances in Earth Science, 2007, 22(8): 842-850.

Relation between variation of δ18O in precipitation in Yarlungzangbo River basin and the moisture flux was analyzed with NCEP/NCAR reanalysis grid data and δ18O in precipitation at four stations ( Lazi, Nugesha, Yangcun and Nuxia ) of the region investigated. For the spatial variations, there is obviously positive correlation between them for the whole basin. With the decrease of moisture flux from the downstream to the upstream,δ18O in precipitation becomes lower gradually. However, for the temporal variations, higher δ18O in precipitation of spring is linked to small moisture flux and low δ18O in precipitation of summer is linked to large moisture flux. And then, a model involving meteorological data from NCEP/NCAR was established and successfully traced the moisture transport trajectories at Yangcun station. Based on the traced results and δ18O in precipitation at Yangcun station, the relation between δ18O in precipitation in Yarlungzangbo River basin and the moisture transport history was discussed. We found that humid marine air mass from the Indian Ocean in general had significantly lower δ18O values than continental air mass from north or local re-evaporation. The fluctuation of δ18O in precipitation during monsoon season is very pronounced and the lower values are usually related to far distance and multilayer of moisture transport, as well as moisture crossing the Himalaya Mountain.

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