HR: 0800h
AN: GC51A-1053    [Abstracts]
TI: Climatological Significances of Ice Core Records from the Mt. Nianquentanglha, Southern Tibetan Plateau
AU: * Kang, S
EM: shichang.kang@itpcas.ac.cn
AF: Institute of Tibetan Plateau Research, CAS, 18 Shuangqing Rd., Haidian District, Beijing, BJ 100085 China
AU: * Kang, S
EM: shichang.kang@itpcas.ac.cn
AF: Key Laboratory of Ice Core and Cold Region Environment, Cold and Arid Regions Environmental and Engineering Research Institute, CAS, 260 Donggang West Rd., Lanzhou, GS 730000 China
AU: Qin, D
EM: qdh@cma.gov.cn
AF: Key Laboratory of Ice Core and Cold Region Environment, Cold and Arid Regions Environmental and Engineering Research Institute, CAS, 260 Donggang West Rd., Lanzhou, GS 730000 China
AU: Qin, D
EM: qdh@cma.gov.cn
AF: China Meteorological Administration, 46 Zhongguancun Nandajie, Beijing, BJ 100081 China
AU: Ren, J
EM: jwren@ns.lzb.ac.cn
AF: Key Laboratory of Ice Core and Cold Region Environment, Cold and Arid Regions Environmental and Engineering Research Institute, CAS, 260 Donggang West Rd., Lanzhou, GS 730000 China
AU: Hou, S
EM: shugui@ns.lzb.ac.cn
AF: Key Laboratory of Ice Core and Cold Region Environment, Cold and Arid Regions Environmental and Engineering Research Institute, CAS, 260 Donggang West Rd., Lanzhou, GS 730000 China
AU: Mayewski, P A
EM: Paul.mayewski@maine.edu
AF: Climate Change Institute, University of Maine, 303 Bryand Global Sciences Center, Orono, ME 04469 United States
AU: Kaspari, S
EM: Susan.kaspari@maine.edu
AF: Climate Change Institute, University of Maine, 303 Bryand Global Sciences Center, Orono, ME 04469 United States
AB: Delta D and net accumulation records covering the period AD 1952-1998 were reconstructed using a 29.5 m ice core from the col of the Lanong Glacier (5850 m a.s.l.) on the eastern saddle of Mt. Nianquentanglha, southern Tibetan Plateau (TP). Using NCEP/NCAR Reanalysis data, we investigate the relationships between ice core records and primary components of the climate system. Linear correlation analysis between Delta D and climate components for the 47 year overlap period indicates that Delta D variations are strongly correlated with summer (JJA) precipitation, winter (DJF) pressure, and geopotential height in both winter and summer over the South Asian and TP region (r above 0.34, p below 0.01). In detail, a negative correlation between Delta D and summer precipitation appears in the regions of Indian continent, Bay of Bengal, while a positive correlation exists over the north of TP. It agrees with amount effect on Delta D values during summer monsoon season considering that the majority of moisture in the south of TP comes from the India Ocean, while local moisture in TP always has higher Delta D values in summer. A negative relationship between Delta D and winter air pressure over central Asia suggests high pressure works as a barrier for winter moisture transportation by the Westerly which holds higher Delta D values compared with summer precipitation Delta D. Negative correlations between Delta D and geopotential height in both summer and winter over Asia indicate stronger atmospheric circulations over Asia correspond with lower Delta D values. Accumulation from the ice core is positively correlated with sea surface temperature (SST) over the Indian Ocean and 500 mb summer air temperature in South Asia and Indian Ocean, indicating high SST causes more moisture transported to the southern TP. Accumulation variations are positively correlated with geopotential height over the South Asia and Indian Ocean, while negatively correlated with these in the region of Siberia during both summer and winter, suggesting that the steeper gradient of air pressure from the Indian Ocean to the north increases precipitation over Mt. Nianquentanglha region. Meanwhile, a positive relationship between accumulation and winter Tibetan air pressure shows that stronger Tibetan High may cause more precipitation in the region.
DE: 3344 Paleoclimatology
DE: 3309 Climatology (1620)
DE: 1699 General or miscellaneous
DE: 1863 Snow and ice (1827)
SC: Global Climate Change [GC]
MN: 2004 AGU Fall Meeting