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研究论文

A study on precipitation chemistry in the late summer in the northern slope of Mt. Xixabangma

基金项目：国家973项目(G1999043400);中国科学院院重大项目(KZ951A1402和KZ951A1204);国家自然科学基金(498710)

摘要：1997年8—9月野外工作期间, 在希夏邦马峰北坡达索普冰川高海拔区(28°33′N, 85°44′E)采集到一批大气降水样品.样品化学分析结果表明, 达索普冰川高海拔区夏末降水化学成分中NO₃^-浓度最高, Mg²⁺浓度最低.海盐离子浓度在海洋性气团降水中高于局地大陆性气团降水.同全球其它偏远地区比较, 本区夏末降水的主要离子浓度较低, 与南极和格陵兰冰盖内陆地区雪冰相当, 表明希夏邦马峰北坡地区夏末大气环境相当“洁净”, 可代表全球偏远地区大气降水的本底状况.达索普冰川区夏末降水的pH值(平均值为6.0)和主要离子浓度表明, 本区夏末大气降水受人类排放污染物的影响很小, 同时降水的电导率较低而且变化较小.

Abstract：During August and September, 1997, precipitation samples were collected from the high elevation region of Dasuopu Galcier in the northern slope of Mt. Xixabangma (28°33′N, 85°44′E). Results of chemical analysis showed that among major species in precipitation, NO₃^-concentration is the highest one and Mg²⁺ is the lowest. Compared with other remote regions in the world, major ion concentrations in precipitation are very low in the late summer in Dasuopu Glacier, which indicates that the atmospheric environment is very clean in the northern slope of Mt. Xixabangma and may be representative of the background of precipitation chemistry. In the late summer, the precipitation chemistry is minimally influenced by anthropogenic pollutants as revealed by precipitation pH (mean value of 6.0) and major ion concentrations in the northern slope of Mt. Xixabangma. Conductivity in precipitation keeps relative low and quite constant.