HR: 0800h
AN: C51B-1048    [Abstracts]
TI: Geochemical Characteristics And Zones Of Surface Snow On East Antarctic Ice sheet
AU: * Kang, J
EM: kangjc@sh163.net
AF: Polar Research Institute of China, #451 Jinqiao Road, Pudong, Shanghai 200129, China, Shanghai, 200129 China
AB: Geochemical characteristics and zones of surface snow on east Antarctic Ice Sheet Jiancheng KANG1,4, Leibao LIU1, Dahe QIN2, Dali WANG1, Jiahong WEN1, Dejun TAN1, Zhongqin LI2, Jun LI3 & Xiaowei ZHANG1,4 1 Polar Research Institute of China, Shanghai 200129, China; 2 Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000, China; 3 Australian Antarctic Division and Antarctic Climate and Ecosystems CRC, Private Bag 80 Hobart, Tasmania, 7001, Australia; 4 Geography Department of Lanzhou University, Lanzhou 730000, China Correspondence should be addressed to Jiancheng KANG (email: kangjc@sh163.net, kangjc@126.com ) Abstract The surface-snow geochemical characteristics are discussed on the East Antarctic Ice Sheet, depending on the stable isotopes ratios of oxygen and hydrogen, concentration of impurities (soluble-ions and insoluble micro-particle) in surface snow collected on the ice sheet. The purpose is to study geochemical zones on the East Antarctic Ice Sheet and to research sources and transportation route of the water vapor and the impurities in surface snow. It has been found that the ratio coefficients, as S1, d1 in the equation ŸOD = S1ŸO18O + d1, are changed near the elevation 2000m on the ice sheet. The weight ratio of Cl-/Na+ at the area below the elevation of 2000m is close to the ratio in the sea salt; but it is about 2 times that of the sea salt, at the inland area up to the elevation of 2000m. The concentrations of non-sea-salt Ca2+ ion (nssCa2+) and fine-particle increase at the interior up to the elevation 2000m. At the region below the elevation of 2000m, the impurity concentration is decreasing with the elevation increasing. Near coastal region, the surface snow has a high concentration of impurity, where the elevation is below 800m. Combining the translating processes of water-vapor and impurities, it suggests that the region up to the elevation 2000m is affected by large-scale circulation with longitude-direction, and that water-vapor and impurities in surface snow come from long sources. The region below the elevation 2000m is affected by some strong cyclones acting at peripheral region of the ice sheet, the sources of water and impurities could be at high latitude sea and coast. The area below elevation 800m is affected by local coastal cyclones. Keywords: Antarctic Ice Sheet, Snow, Geochemical Zones
DE: 9310 Antarctica
DE: 1040 Isotopic composition/chemistry
DE: 1045 Low-temperature geochemistry
DE: 0330 Geochemical cycles
DE: 1000 GEOCHEMISTRY (New field, replaces Rock Chemistry)
SC: Cryosphere [C]
MN: 2004 AGU Fall Meeting