The effect of source area and atmospheric transport on mineral aerosol collected over the North Pacific Ocean
The effect of source area and atmospheric transport on mineral aerosol collected over the North Pacific Ocean
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DOI：
10.1016/s0921-8181(98)00013-7
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发表时间：
1998-09
期刊：
影响因子：
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通讯作者：
E. Arnold;J. Merrill;M. Leinen;J. King
中科院分区：
文献类型：
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作者：
E. Arnold;J. Merrill;M. Leinen;J. King
对在两次北太平洋航行中收集的气溶胶样品进行了岩石磁性、粒度以及<2 μm和2-20 μm矿物学分析。这些沉积学的结果进行了比较，以研究源区和大气输送对矿物气溶胶的影响。结果表明，两个大源区的气溶胶成分和粒径存在差异。来自西太平洋的气溶胶具有丰富的细粒气溶胶的特征，具有高矫顽力的磁性成分，并且相对富含高岭石。来自太平洋盆地北部和东部大陆的气溶胶含量要少得多，含有粗粒物质，磁性成分低，矿物学上斜长石相对富集。比较亚洲矿物气溶胶与大气输送时间的关系表明，矿物气溶胶的浓度随输送时间的增加而降低。矿物气溶胶的成分分馏，因为它远离大陆源区，与相对减少的主要矿物石英和斜长石和增加的蒙皂石，伊利石和蒙脱石浓度随运输时间的增加。
Aerosol samples collected on two North Pacific cruises were analyzed for rock-magnetic properties, grain size and <2 μm and 2–20 μm mineralogy. These sedimentological results were compared with isentropic air mass trajectories in order to study the effects of source region and atmospheric transport on the mineral aerosol. The results indicate that there are differences in the aerosol composition and grain size for two broad source regions. Aerosols which originate from west of the Pacific are characterized by abundant, fine-grained aerosol, which has a high coercivity magnetic composition, and is relatively enriched in kaolinite. Aerosols originating from continents to the north and east of the Pacific basin are much less abundant, contain coarse-grained material with a low coercivity magnetic component, and the mineralogy is relatively enriched in plagioclase. Comparison of the mineral aerosol from Asia with atmospheric transport time indicated that the concentration of the mineral aerosol decreases with increasing transport time. The mineral aerosol is compositionally fractionated as it moves away from the continental source region, with a relative decrease in the primary minerals quartz and plagioclase and an increase in the smectite, illite and chlorite concentration with increasing transport time.