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Mass balance of the Lambert glacier.basin,East Antarctica

Science China Earth Sciences 2002年第9期45卷 842-850页

作者：任贾文 Ian Allison 效存德秦大河 Laboratory of Ice Core and Cold Regions Environment Cold and Arid Regions Environmental and Engineering Research Institute Chinese Academy of Sciences Lanzhou 730000 China

Since it is the largest glacier.system in Antarctica, the Lambert glacier.basin plays an important role in the mass balance of the overall Antarctic ice sheet. The observed data and shallow core studies from the inland traverse investigations in recent years show that there are noticeable differences in the distribution and variability of the snow accumulation rate between east and west sides. On the east side, the accumulation is higher on the average and has increased in the past decades, while on the west side it is contrary. The ice movement measurement and the ice flux calculation indicate that the ice velocity and the flux are larger in east than in west, meaning that the major part of mass supply for the glacier.is from the east side. The mass budget estimate with the latest data gives that the integrated accumulation over the upstream area of the investigation traverse route is larger than the outflow ice flux by 13%, suggesting that the glacier.basin is in a positive mass balance state and the ice thickness will increase if the present climate is keeping.

关键词： mass balance, Antarctic Ice Sheet, Lambert glacier.

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Processes and environmental significance of the subglacial chemical deposits in Tianshan Mountains

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Science China Earth Sciences 2005年第9期48卷 1470-1478页

作者： LIU Gengnian LUO Risheng CAO Jun CUI Zhijiu College of Environmental Sciences Peking University Beijing 100871 China College of Environmental Sciences Peking University Beijing 100871 China College of Environmental Sciences Peking University Beijing 100871 China College of Environmental Sciences Peking University Beijing 100871 China

On the bedrock surface of glacier.No.1 in the headwater of Urumqi River, Tianshan Mts., well layered and crystallized subglacial calcite precipitations were discovered. Based on observations and analysis of the surface form, sedimentary texture and structure, and chemical composition of the deposits, clues about the subglacial processes and environment are deduced. The radial-growth crustation texture of the deposits, which builds up in the saturated CaCO3 so- lution, proves the existence of pressure melting water and water films under glacier.No.1; and their rhythmic beddings, dissolved planes and unconformable contacts show that the water films responsible for the formation of these structures were in a wide range of spatial as well as tem- poral variations. Though formed under continental glacier.in non-limestone area, the deposits are quite similar to those formed under temperate glacier. in limestone areas, a fact that shows a similar process of chemical precipitation between the two. Hence the enrichment of calcium in the subglacial melting water and the process of precipitation have actually little to do with the bedrock lithology and the glacier.types. The cemented detritus in the deposits are rich in Fe and Al while depleted in K, Na and Si; also the included clay mineral consists mainly of illite, which reveals some weak chemical weathering under the continental glacier. The subglacial CaCO3 precipitates when plenty of Ca++ melt into the subglacial melting water on a comparatively en- closed ice-bedrock interface under a high CO2 partial pressure, the forming of subglacial chemical deposits therefore offers unequivocal evidence for the ongoing of subglacial chemical reactions.

关键词： subglacial processes, chemical deposits, continental glacier.

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A new type of ice formation zone found in the Himalayas

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Chinese Science Bulletin 1999年第5期44卷 469-474页

作者： Tandong Yao Jianchen Pu Ninlian Wang Lide Tian Chinese Acad Sci Lanzhou Inst Glaciol & Geocryol Lab Ice Core & Cold Reg Environm Lanzhou 730000 Peoples R China

Ice formation was studied on the Dasuopu glacier.located in the Mount Xixabangma (28°23’ N, 85°43’E) in the Himalayas. Snow pits and shallow ice cores are analyzed to reveal ice formation process. The results show that the ice formation process, or in other words, the process of densitification, on the col (7 000 m a.s.l. ) of the Dasuopu glacier.is a stable, slow and gradual process. The snow-ice transformation on the glacier.is estimated to be 30—40 m below the surface. The temperature on the Dasuopu glacier.is very low (～ - 14℃ at 10 m) and similar to that in polar type ice cap. We,therefore, speculate that the process of snow-ice transformation is undertaken under snow pressure,and that there is a percolation zone on the Dasuopu glacier. The high altitude of the col and monsoon snow fall accompnied by heavy cloud and high albedo favorite the percolation zone formation.

关键词： ice formation glacial accumulation Dasuopu glacier.

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