| 喜马拉雅山中段北坡对流层中上部大气降水化学的高程分布特征 |
| 摘要点击 1761 全文点击 1819 投稿时间：2000-06-08 |
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| 中文关键词 喜马拉雅山北坡 降水化学 高程分布 |
| 英文关键词 the northern slope of Himalayas precipitation chemistry elevation distribution |
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| 中文摘要 |
| 1997年夏季在希夏邦马峰北坡达索普冰川区(28°33′N,85°44′E)海拔5800m～7000m区间对4次降雪过程进行了系统的采样工作,目的是认识全球偏远地区对流层中上部大气成分的高程分布特征.达索普冰川区夏季4次降水中,局地大陆性气团降水SO42-、NO3-、Ca2+和Mg2+之间存在显著的正相关性,而海洋性气团降水4种离子之间的相关性变化较大,说明在夏季低尘埃阶段大气中各种离子的主导来源处在短期的(如数天)变化中.这种离子主导来源的变化同时也影响了降水中离子的高程分布特征.总体上达索普冰川区夏季降水中NO3-、Ca2+、Mg2+浓度随海拔的升高呈减小趋势,SO42-浓度则为增大趋势. |
| 英文摘要 |
| During 1997 summer, fresh snow samples were collected from four snowfall events from the elevation of 5800 to 7000 m in the Dasuopu Glacier region on the northern slope of Mt. Xixabangma (28°33′N,85°44′E), in order to understand the elevation distribution of the middle/upper tropospheric components in the remote region. The correlation between SO42-, NO3-, Ca2+ and Mg2+ in precipitation differs with type of air mass, indicating the dominant sources of ions vary in short term (e.g. several days) during summer low dust period. In general, with elevation increases, the concentrations of NO3-, Ca2+ and Mg2+ decreases, while SO42- increases, which are influenced by the variation of dominant sources of ions. |
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