摘要
运用多种方法,对白水1号冰川积累区冰雪剖面的主要阴、阳离子和δ18O的环境意义分析表明,受强烈淋溶作用影响,离子和δ18O的季节变化不明显,剖面离子浓度显著低于雪坑,离子流失量较大。NH4+年际变化最为显著,与丽江降水表现出相同的变化趋势,Mg2+和Ca2+浓度与冰雪剖面净积累量呈反向变化。分析表明,阴离子主要是湿沉降产物,阳离子主要是干沉降产物。该剖面所反映的13年δ18O比率变化介于-11.8‰～-14.6‰。冰雪剖面中δ18O与西南季风指数、冰雪剖面积累量、丽江降水和丽江气温呈反向变化,表现出显著的"降水量效应"。
Samples were colleted from the accumulation area,Baishui No.1 glacier in May,2004.The method of sea-salt ions tracer,correlation analysis and trend analysis were used in this research in order to confirm the environmental records.It is indicated that the seasonal variation of ions and δ^18O is very weak owing to ionic eluviation.The inter-annual variation of NH4^＋ concentrations is apparent,and it is similar to the precipitation （from May to October） in Lijiang City.The variation trend is inverse between net accumulation and concentrations of Mg^2＋and Ca^2＋.The main ionic non-marine source is local dust,and the secondary source is dust from central Asian arid regions carried by westerly circulation and the southeastern plateau bear areas with the Qinghai-Tibet plateau winter monsoon.In addition,the import of pollutants with monsoonal circulation from industrial areas has made some contribution to anions concentration in the study area.The values of δ^18O vary from-11.8‰ to-14.6‰,whose precipitation effect is obvious.It is important that the shallow firn profile can record environmental information in China＇s monsoonal temperate glacier region.
出处
《地球与环境》
CAS
CSCD
北大核心
2009年第4期360-365,共6页
Earth and Environment
基金
国家自然科学基金项目(40971019)
国家自然科学基础人才培养基金冰川学冻土学特殊学科点(J0630966)
国家重点基础研究发展(973)计划(2007CB411501)
中国科学院研究生科技创新与社会实践资助专项
冰冻圈科学国家重点实验室自主项目
中国科学院重要方向性项目(KZCXZ-YW-317)
中国科学院"西部之光"人才培养计划"西部博士资助项目"(O828A11001)
国家自然科学基金项目(90511007
40801028)
丽江市政府委托项目资助
