摘要
1 997年夏季在希夏邦马峰北坡达索普冰川区 ( 2 8°33′N ,85°4 4′E)海拔 580 0m～ 70 0 0m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SO4 2 - 、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 ,SO4 2 - 浓度则为增大趋势 .
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 SO 4 2- , NO 3 -, Ca 2+ and Mg 2+ 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 NO 3 -, Ca 2+ and Mg 2+ decreases, while SO 4 2- increases, which are influenced by the variation of dominant sources of ions.
出处
《环境科学》
EI
CAS
CSCD
北大核心
2001年第2期118-122,共5页
Environmental Science
基金
国家973项目!(G19990 4340 0 )
中国科学院院重大项目!(KZ95 1 A1 40 2和KZ95 1 A1 2 0 4)
国家自然科学基金!项目 (4 98710 2 2 )
关键词
喜马拉雅山北坡
降水化学
高程分布特征
大气质量
the northern slope of Himalayas
precipitation chemistry
elevation distribution
