HR: 14:55h
AN: C43D-06    [Abstracts]
TI: Stable Isotopic Variations in Precipitation and Moisture Transport on the Tibetan Plateau
AU: * Tian, L
EM: ldt@itpcas.ac.cn
AF: Institute of Tibetan Plateau Research, Chinese Academy of Sciences, P. B. 2871, 18 Shuangqing Rd., Beijing, 100085 China
AU: * Tian, L
EM: ldt@itpcas.ac.cn
AF: Laboratory of Ice Core and Cold Regions Environment, Cold and Arid Regions Environmental and Engineering Research Institute, Lanzhou, 730000 China
AU: Yao, T
EM: tdyao@itpcas.ac.cn
AF: Institute of Tibetan Plateau Research, Chinese Academy of Sciences, P. B. 2871, 18 Shuangqing Rd., Beijing, 100085 China
AU: Yao, T
EM: tdyao@itpcas.ac.cn
AF: Laboratory of Ice Core and Cold Regions Environment, Cold and Arid Regions Environmental and Engineering Research Institute, Lanzhou, 730000 China
AU: Yu, W
EM: ldt@itpcas.ac.cn
AF: Laboratory of Ice Core and Cold Regions Environment, Cold and Arid Regions Environmental and Engineering Research Institute, Lanzhou, 730000 China
AU: Wang, N
EM: ldt@itpcas.ac.cn
AF: Laboratory of Ice Core and Cold Regions Environment, Cold and Arid Regions Environmental and Engineering Research Institute, Lanzhou, 730000 China
AU: Xu, B
EM: ldt@itpcas.ac.cn
AF: Institute of Tibetan Plateau Research, Chinese Academy of Sciences, P. B. 2871, 18 Shuangqing Rd., Beijing, 100085 China
AU: Xu, B
EM: ldt@itpcas.ac.cn
AF: Laboratory of Ice Core and Cold Regions Environment, Cold and Arid Regions Environmental and Engineering Research Institute, Lanzhou, 730000 China
AB: Stable isotopic ratios in precipitation from the Network of Isotope in Precipitation on the Tibetan Plateau are discussed. A decade of continuous observation shows that stable isotopes in precipitation on the northern Tibetan Plateau (TP) are controlled by air temperature. A regression of the annual datasets for the Delingha location (northeast Tibetan Plateau) shows a close relationship ($\delta$$^{18}$O=0.638T-13.31, R$^{2}$=0.58) between $\delta$$^{18}$O in precipitation and air temperature. Along the southern Tibetan Plateau, the monsoon dominates the temporal and spatial variation of $\delta$$^{18}$O in precipitation such that summer precipitation is characterized by very low (depleted) $\delta$$^{18}$O values. A comparison of the temporal variation of $\delta$$^{18}$O at different stations on the TP also reveals the strong monsoonal influence. The results from our observations of present precipitation agree quite well with the results from shallow ice core records. At two northern sites, the Dunde and Muztagata ice core $\delta$$^{18}$O records show comparable variation with air temperatures from a nearby meteorological station. The $\delta$$^{18}$O record from Dasuopu, along the southern margin of the TP, shows a negative relation with the precipitation record from a nearby meteorological station. The spatial and seasonal variations of stable isotopes in precipitation on the TP show the apparent impact of different air masses. The spatial variation patterns of the stable isotopes in precipitation on the Tibetan Plateau show the northern extent of the southwest monsoon. The seasonal variation of moisture sources results in the large seasonal fluctuation of isotopic ratios and high d-excess in precipitation on the southern slope of the Himalayas. The spatial variations of stable isotopes also reveal the impact of the southwest monsoon and westerly transport.
DE: 9320 Asia
DE: 3309 Climatology (1620)
DE: 1854 Precipitation (3354)
DE: 1863 Snow and ice (1827)
DE: 1040 Isotopic composition/chemistry
SC: Cryosphere [C]
MN: 2004 AGU Fall Meeting