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东南极中山站-格罗夫山考察沿线海源物质空间分布特征研究

, PP. 1997-2005

Keywords: 海源物质,海盐,硫化物,Lambert盆地

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Abstract:

?对东南极Lambert冰川东缘中国南极科学考察(CHINARE)沿线中山站-格罗夫山(距海450km)段雪坑(或粒雪芯)中海源离子(Na+,Cl-,nss-SO42-和MSA)的分布状况进行了分析.海盐离子(Na+和Cl-)浓度在距离海岸带100km以内(高程低于1500m)呈现指数降低趋势,统计结果表明距海远近及海拔是影响内陆地区海盐离子的沉积浓度的两项重要因子.随着向内陆距离的增加,Cl-/Na+比值呈增长趋势,同时伴随标准偏差波动幅度的增加,表明东南极内陆地区可能存在除海盐之外其他来源的贡献.格罗夫山地区9个采样点获取的样品中Na+和Cl-离子的浓度高于CHINARE沿线与格罗夫山相似距海距离的采样点,格罗夫山的低海拔及特殊的地形条件可能是导致较高浓度的主要原因.考察沿线样品中nss-SO42-和MSA两种不同的硫化物呈现不同的变化趋势,相比MSA,nss-SO42-呈现出随距离的增加更为显著的降低趋势,表明不同的来源及传输途径可能对内陆地区两种硫化物的沉积具有重要影响,不同研究点两者的相关系数进一步支持了该研究结论.

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