达索普冰芯中现代环境信息记录  

Modern Environment Information Recordedin Dasuopu Shallow Ice Core

作　　者：段克勤[1] 姚檀栋[1] 皇翠兰[1] 蒲健辰[1] 杨志红[1] 

机构地区：[1]中国科学院兰州冰川冻土研究所冰芯室

出　　处：《环境科学》1998年第5期1-5,共5页Environmental Science

基　　金：国家"九五"攀登计划项目

摘　　要：１９９６－０７～０８，中美联合考察队成功地考察了希夏邦马地区达索普冰川，并提取了一支２０ｍ长的冰芯，这支冰芯是迄今为止世界上海拔最高的冰芯．对资料分析发现离子含量变化显示强烈的周期性变化，反映了季节变化的特征．离子浓度高低变化将指示气候的冷暖变化，并与δ１８Ｏ存在着对应关系，但δ１８Ｏ对气候变化的反映没有各种离子反映灵敏．δ１８Ｏ值自１９８９年以来迅速增大．该冰川受人类活动影响微弱．阳离子浓度大小顺序与地壳中顺序一致．同时，该冰川所记录的ＮＯ－３和ＳＯ２－４的多年平均浓度可做为青藏高原南部对流层中上部ＮＯ－３和ＳＯ２－４的浓度的本底值，其中ＮＯ－３的１３ａ平均浓度为２８０ｎｇ·ｇ－１，ＳＯ２－４的１３ａ平均浓度为１５６．８８ｎｇ·ｇ－１．In June—August 1996,a ChineseAmerican expedition team successfully recovered an ice core (20m) from the Dasuopu Glacier(summit 7000m a.s.l)in the Himalayas.The Dasuopu Glacier is suitable to drill ice core.Major ions (NO-3,SO2-4,Cl-,Na+,K+,Ca2+,Mg2+) and δ18O analyses indicate that the glacier has not suffered from human activities.Ions and δ18O can reflect climate change.But ions are more sensitive to reflect climate and environment than that δ18O does.The values of NO-3 and SO2-4 recorded in this ice core can be used as the background values of NO-3 and SO2-4 in the middleupper troposphere over the South of QihaiTibetan Plateau.The mean value of NO-3 for 13 years is 280ng·g-1 and that of SO2-4 for 13 years is 15688ng·g-1.The proper order of cations in the Dasuopu ice core is same as that in the earth crust.

关 键 词：冰芯 环境记录 气候 环境变化 古气象学 

分 类 号：P532[天文地球—古生物学与地层学]