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近500年来喜马拉雅山达索普冰芯中尘埃含量变化与西、南亚及北非干旱化趋势

Keywords: 达索普冰芯,尘埃,干旱化,气候变化

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Abstract:

本文重建了近500年来喜马拉雅山中段达索普冰芯中尘埃浓度与尘埃沉积通量的变化历史,谱分析结果表明它们的变化均存在较显著的12.3年、9.8年、7.4年、6.1年和5.3年周期。该冰芯中尘埃含量与净积累量之间不存在任何相关性,说明其尘埃可能主要来源于上风方向的远源地区。基于后向轨迹法,并结合该地区附近已有的气溶胶研究结果,认为西、南亚甚至北非地区可能是该冰芯中尘埃物质的主要源区。近500年来达索普冰芯中尘埃沉积通量的增加趋势,反映了其源区干旱程度的加重趋势。

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