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篇目详细内容 |
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【篇名】 |
Influence of moisture transport on stable isotope in precipitation in Yarlungzangbo River basin |
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【刊名】 |
Frontiers of Earth Science in China |
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【刊名缩写】 |
Front. Earth Sci. China |
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【ISSN】 |
1673-7385 |
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【EISSN】 |
1673-7490 |
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【DOI】 |
10.1007/s11707-008-0012-2 |
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【出版社】 |
Higher Education Press and Springer-Verlag |
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【出版年】 |
2008 |
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【卷期】 |
2
卷1期 |
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【页码】 |
49-57
页,共
9
页 |
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【作者】 |
LIU Zhongfang;
TIAN Lide;
YAO Tandong;
GONG Tongliang;
YIN Changliang;
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【关键词】 |
δ18O; precipitation; moisture flux; moisture transport; Yarlungzangbo River basin |
【摘要】 |
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The relationship between the 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. 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, δ18O in precipitation became gradually decreased. However, in terms of temporal variations, higher δ18O in precipitation during spring is linked to small moisture flux while low δ18O 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 δ18O 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 δ18O values than the continental air mass from the north or local re-evaporation. The fluctuation of δ18O 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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