HR: 17:00h
AN: C44A-05    [Abstracts]
TI: A High Resolution Ice Core Record from the Puruogangri Ice Field, Tibetan Plateau
AU: * Tandong, Y
EM: tdyao@itpcas.ac.cn
AF: Institute of Tibetan Plateau Research, P. O. Box 2871, Beijing, 100085 China
AU: * Tandong, Y
EM: tdyao@itpcas.ac.cn
AF: Cold Region's Environment and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou, 730000 China
AU: Thompson, L G
EM: thompson.3@osu.edu
AF: The Ohio State University, Byrd Polar Research Center 1090 Carmack Road, Columbus, OH 43210 United States
AU: Thompson, L G
EM: thompson.3@osu.edu
AF: Cold Region's Environment and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou, 730000 China
AU: Davis, M E
EM: davis.3@osu.edu
AF: The Ohio State University, Byrd Polar Research Center 1090 Carmack Road, Columbus, OH 43210 United States
AU: Mosley-Thompson, E S
EM: thompson.4@osu.edu
AF: The Ohio State University, Byrd Polar Research Center 1090 Carmack Road, Columbus, OH 43210 United States
AU: Ninglian, W
EM: wang.803@osu.edu
AF: Institute of Tibetan Plateau Research, P. O. Box 2871, Beijing, 100085 China
AU: Ninglian, W
EM: wang.803@osu.edu
AF: Cold Region's Environment and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou, 730000 China
AU: Mashiotta, T A
EM: mashiotta.1@osu.edu
AF: The Ohio State University, Byrd Polar Research Center 1090 Carmack Road, Columbus, OH 43210 United States
AU: Lin, P
EM: lin.25@osu.edu
AF: The Ohio State University, Byrd Polar Research Center 1090 Carmack Road, Columbus, OH 43210 United States
AU: Baiqing, X
EM: tdyao@itpcas.ac.cn
AF: Institute of Tibetan Plateau Research, P. O. Box 2871, Beijing, 100085 China
AU: Baiqing, X
EM: tdyao@itpcas.ac.cn
AF: Cold Region's Environment and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou, 730000 China
AB: Three ice cores (215 m, 154 m, and 118 m in length) have been recovered from the Puruogangri Ice Field ($\sim$33\deg$44' $-$ $34\deg$03'N; $\sim$89\deg$00' $-$ $89\deg$20'E; 422.6 km$^{2}$; 5970 masl) on the western end of the Tanggula Mountain Range. The ice bedrock temperature is -$6.2\deg$C. These cores have been continuously analyzed for stable oxygen isotopic ratios, concentrations of major ions and insoluble dust, and total Beta radioactivity. Annual layer thicknesses for the last 41 years reveal an average net annual accumulation 370 mm of water equivalent. The isotopic records from this very remote site indicate that the most significant isotopic enrichment (interpreted as atmospheric warming) in the ice field's history has occurred in the last 50 years. Puruogangri is surrounded by sand dunes that lap onto its margins and as the sand moves in the spring, it produces a distinct annual dust layer that allows precise dating of the cores. Moreover, Puruogangri's vertical relief facilitates the transportation of fragments of the sparse vegetation in the area to the top of the ice field. AMS 14C dating of several plant fragments from near the bottom of the core indicates that the Puruogangri Ice Field formed in the mid-Holocene. The possible reasons will be discussed as to why this high, cold and remote ice field is so young (mid-Holocene).
DE: 3344 Paleoclimatology
DE: 1803 Anthropogenic effects
DE: 1827 Glaciology (1863)
DE: 1863 Snow and ice (1827)
DE: 1600 GLOBAL CHANGE (New category)
SC: Cryosphere [C]
MN: 2004 AGU Fall Meeting