| 达索普冰芯中现代环境信息记录 |
| 摘要点击 868 全文点击 1274 投稿时间：1998-01-14 |
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| 中文关键词 希夏邦马达索普 冰芯 离子 环境 记录 本底值 |
| 英文关键词 Dasuopu shallow ice core environment major ions background values |
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| 中文摘要 |
| 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NO3-和SO42-的多年平均浓度可做为青藏高原南部对流层中上部NO3-和SO42-的浓度的本底值,其中NO3-的13a平均浓度为280ng·g-1,SO42-的13a平均浓度为156.88ng·g-1. |
| 英文摘要 |
| In June—August 1996,a Chinese-American 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 (NO3-,SO42-,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 NO3- and SO42- recorded in this ice core can be used as the background values of NO3- and SO42- in the middle upper troposphere over the South of Qihai-Tibetan Plateau.The mean value of NO3- for 13 years is 280ng·g-1 and that of SO42- for 13 years is 156.88ng·g-1.The proper order of cations in the Dasuopu ice core is same as that in the earth crust. |
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