Influence of moisture transport on stable isotope in precipitation in Yarlungzangbo River basin |
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Authors: | Zhongfang LIU Lide TIAN Tandong YAO Tongfiang GONG Changfiang WIN |
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Institution: | (1) Institute of Tibetan Plateau Research, Chinese Academy of Sciences, 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 |
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Abstract: | The relationship between the variation of δ
18O in precipitation in Yarlungzangbo River basin and the moisture flux was analyzed with NCEP/NCAR reanalysis grid data and
δ
18O in precipitation at four stations (Lazi, Nugesha, Yangcun and Nuxia) of the region investigated. In terms of spatial variations,
there is obviously a positive correlation between them for the entire basin. With the decrease in moisture flux from the downstream
to the upstream area, δ
18O in precipitation became gradually decreased. However, in terms of temporal variations, higher δ
18O in precipitation during spring is linked to small moisture flux while low δ
18O in precipitation during summer is linked to large moisture flux. A model involving meteorological data from NCEP/NCAR was
subsequently set up which successfully traced the moisture transport trajectories at Yangcun station. Based on the traced
moisture transport trajectories and the δ
18O in precipitation at Yangcun station, the relationship between δ18O in precipitation in Yarlungzangbo River basin and the moisture transport history was discussed. We found that the humid
marine air mass from the Indian Ocean in general has significantly lower δ
18O values than the continental air mass from the north or local re-evaporation. The fluctuation of δ
18O in precipitation during the monsoon season is very pronounced; the lower values are usually related to farther distance
and multilayer moisture transport, as well as moisture crossing the Himalaya Mountains.
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Translated from Advances in Earth Science, 2007, 22(8): 842–850 译自: 地球科学进展] |
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Keywords: | δ 18O precipitation moisture flux moisture transport Yarlungzangbo River basin |
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