Stable Isotope Variations in Monsoon Precipitation on the Tibetan Plateau

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概要

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• Precipitation samples were collected in a large-scale region(more than 2, 000km from the north to the south of the Tibetan Plateau) and a middle scale region(with an area about 9, 000km^2) in the Tibetan Plateau to study the impact of monsoon precipitation on stable isotopes. In the large-scale region, samples of precipitation and river water were collected at several stations from the north to the south along the Qinghai-Tibet Highway on the plateau. Results show that the Indian monsoon not only influences the spatial variation of stable isotope in precipitation, but also the relationship between δ^<18>O and δD. Deuterium excess(d) in areas where precipitation is directly controlled by monsoon precipitation is lower, while in the northern Tibetan Plateau, d is in higher value due to the influence of continental air mass and strong local hydrological recycling. A detailed study on oxygen stable isotope in precipitation was carried out on the middle scale in the Nagqu Basin area. The temporal variation of δ^<18>O in daily precipitation at 6 sites shows quite similar trends, indicating that δ^<18>O in precipitation in the middle Tibetan Plateau is mainly controlled by large-scale synoptic condition, rather than the local meteorological factors. The spatial variation of δ^<18>O in precipitation in the basin agrees with the Tibet-scale spatial variation trend and local hydrological recycling. Temporal variations of δ^<18>O in precipitation also show a close relation to the movements of monsoon precipitation. The onset of monsoon in the earlier summer leads to low δ^<18>O value. There is a negative relation between δ^<18>O and SWI(south wind index). High SWI, which represents intensive transport of moisture from south with the monsoon movement, is coincided with lower δ^<18>O values, while low SWI, which represents moisture from inland air mass or local evaporated moisture, is associated with higher δ^<18>O values.

• 2001-10-25

著者

• Yao Tandong

  Laboratory Of Ice Core And Cold Regions Environment Cold And Arid Regions Environmental And Engineer

• Tian Lide

  Laboratory Of Ice Core And Cold Regions Environment Cold And Arid Regions Environmental And Engineer

• Numaguti Atsusi

  Graduate School of Environmental Earth Science

• Sun Weizhen

  Laboratory of Ice Core and cold Regions Environment, Cold and Arid Regions Environmental and Enginee

• Sun Weizhen

  Laboratory Of Ice Core And Cold Regions Environment Cold And Arid Regions Environmental And Engineer

• Numaguti Atusi

  Graduate School of Environmental Earth Science

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