积雪中不溶微粒与Mg^(2+)的沉积特征和相互关系  

Study on Deposition Characteristics of Insoluble Microparticles and Mg^(2+) Concentration in Snow Cover and Their Correlation

作　　者：尤晓妮[1,2] 李忠勤[2] 

机构地区：[1]天水师范学院,甘肃天水741000 [2]中国科学院寒区旱区环境与工程研究所,甘肃兰州730000

出　　处：《干旱区研究》2012年第1期143-147,共5页Arid Zone Research

基　　金：中国科学院寒区旱区环境与工程研究所引进国外杰出人才基金项目(CACX2003101);国家自然科学基金项目(40371028;40301009;90102005);国家自然科学基金创新群体项目共同资助

摘　　要：为了探究不溶微粒和Mg2+在雪冰沉积过程中的相关性,对采自乌鲁木齐河源1号冰川海拔4 130 m处的雪冰样品进行不溶微粒和Mg2+浓度的分析。表层雪中不溶微粒和Mg2+浓度的季节变化具有较好的一致性,在6～8月的降水频发期和局地风盛行时,两者都达到一年中的最大值。粗微粒(直径大于10μm)和Mg2+浓度在雪层剖面中的垂直分布亦具有很好的相似性,表现出相同的演化趋势,暗示两者在后沉积过程中的相关性。这种相关性被证明与同期温度变化呈现出明显的负相关。It is a part of the PGPI（Program for Processe Investigation） to study the relationship between insoluble microparticles and magnesium,and it was initiated at the Tianshan Glaciological Station in July 2002.In this paper,the vertical distribution and evolution process of insoluble microparticle and magnesium concentration along vertical profiles of snow pits as well as their seasonal variation were studied by weekly sampling from a snow pit（4 130 m a.s.l.,in the percolation zone） on Glacier No.1 in the east Tianshan Mountains from September 2003 to September 2004.The analyzed results of insoluble microparticles and magnesium concentration reveal that their change trends were similar in both surface snow and along vertical snow profiles.In winter,insoluble microparticles and magnesium concentrations in surface snow layer were altered slightly by sublimation and wind erosion.In early summer,as snow melting occurred in the upper part of snow-firn pack,snow meltwater carried microparticles and magnesium to different depths of the underlying snow-firn layers,all the surface elements might be leached out from the upper layers at the end of the ablation season.Correlation coefficient between concentration of insoluble microparticles and magnesium along vertical profiles of snow layer showed a significant negative correlation with temperature.

关 键 词：不溶微粒 气溶胶 矿物粉尘 Mg2+浓度 沉积过程 1号冰川 乌鲁木齐河 天山 

分 类 号：P343.6[天文地球—水文科学]