2007・2008年に東大阪市で捕集された黄砂粒子の個別粒子分析

概要

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Particulate samples were collected by dust sampler during the Asian dust storm events in May 2007 and March 2008 at Higashiosaka, Japan (34°39'N, 135°35'E) to research modification of the Asian dust during transportation. The elemental composition of individual particles was determined using a scanning electron microprobe equipped with an energy-dispersive X-ray analyzer (SEM-EDX). According to the elemental compositions of the 2.5 to 10 μm particles, 94.4% of the particles in the May 2007 samples were Si-rich. The March 2008 samples were also Si-rich but showed Ca- and Na-rich particles of 8.2% and 6.9%, respectively. Surface soil samples, collected at Saynshand and Han Uul, Mongolia, where are the ones of the recent possible Asian dust source areas, were also analyzed. The results were similar to those found in the samples collected at Higashiosaka. Of special note was the similarity found in the ratio of Si-Al particles. The number of Asian dust storm particles adsorbing sulfur oxides was especially high in 2008. This could be explained by influences from the industrial areas in China. Other explanations would include consideration of the relationships between the ratio of modified particles and particle size and humidity during transport.
日本地球化学会の論文
2009-08-31