The compositions, sources, and size distribution of the dust storm from China in spring of 2000 and its impact on the global environment
The compositions, sources, and size distribution of the dust storm from China in spring of 2000 and its impact on the global environment
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DOI：
10.1007/bf02900460
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发表时间：
2001-06
影响因子：
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通讯作者：
G. Zhuang;Jinghua Guo;Hui Yuan;Chengyi Zhao
中科院分区：
文献类型：
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作者：
G. Zhuang;Jinghua Guo;Hui Yuan;Chengyi Zhao
2000年春季沙尘暴期间，北京市气溶胶的平均质量浓度为~ 6000 μg·m−3，是非沙尘暴日的30倍。污染元素As、Sb和Se的富集因子均高于非沙尘暴日。这表明，As、Sb和Se在长距离输送过程中除了来源于北京局地污染源外，还来源于沙尘暴经过的区域污染源。Pb、Zn、Cd和Cu的富集因子明显小于非沙尘暴日，说明北京地区的局地污染源对其富集的贡献最大。Al、Fe、Sc、Mn、Na、Ni、Cr、V、Co等元素富集因子接近1，表明这些元素来源于地壳。沙尘中S的浓度为~ 10 μg·m−3，是非沙尘的4倍。气溶胶中的S是由于气态SO2的吸附及其转化而产生的。沙尘气溶胶中粒径小于2.1 μm和9.0 μm的细颗粒物分别占16.1%和76.9%，粗颗粒物较多。值得注意的是，从沙尘暴中检测到相当一部分铁（II）。铁（II）容易溶解于海水中，为浮游植物提供营养，并会导致海洋中二甲硫化物（DMS）的排放量增加。大气中铁与S的耦合反馈可能是影响太平洋和/或全球气候变化的重要机制。
The average mass concentration of the aerosols in Beijing during the dust storm in the spring of 2000 was ∼6000 μg · m−3, ∼30 times as high as that in the non-dust storm days. The enrichment factors of the pollution elements As, Sb and Se were higher than those in the non-dust storm days. This indicated that As, Sb and Se resulted from the pollution sources of those areas, through which the dust storm passed during their long-range transport, in addition to the local pollution sources in Beijing. The enrichment factors of the Pb, Zn, Cd and Cu were much less than those in the non-dust storm days, suggesting that the local pollution sources in Beijing area contributed to them mostly. The enrichment factors of elements Al, Fe, Sc, Mn, Na, Ni, Cr, V and Co were close to 1, showing that these elements originated from crust. The concentration of S in the dust storm was ∼10 μg · m−3,4 times as high as that in non-dust storm. S in the aerosols resulted from the adsorption of gaseous SO2 and the consequent transformation on it. The aerosols of the dust storm contained 16.1% and 76.9% of fine particles with the sizes less than 2.1 and 9.0 μm, respectively, while it had a large number of coarse particles. It was noted that a considerable portion of Fe(II) was detected from the dust storm. Fe(II) could easily dissolve in seawater to be nutrient for phytoplankton and would lead to the increase of the emission of dimethylsulfide (DMS) from the ocean. The feedbacks of Fe coupled with S in atmosphere might be the important mechanism that would affect the primary productivity in Pacific and/or the global climate change.