Mass concentration and mineralogical characteristics of aerosol particles collected at Dunhuang during ACE-Asia
Mass concentration and mineralogical characteristics of aerosol particles collected at Dunhuang during ACE-Asia
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DOI：
10.1007/s00376-006-0291-z
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发表时间：
2006-03
影响因子：
5.8
通讯作者：
Zhenxing Shen;Junji Cao;Xuxiang Li;T. Okuda;Yaqiang Wang;Xiaoye Zhang
中科院分区：
文献类型：
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作者：
Zhenxing Shen;Junji Cao;Xuxiang Li;T. Okuda;Yaqiang Wang;Xiaoye Zhang
在2001年和2002年春季进行了测量，以确定中国敦煌沙漠地区的土壤尘埃特征，敦煌是亚太区域气溶胶特征试验（ACE-Asia）的地面站点之一。2001年和2002年春季总悬浮颗粒物的平均质量浓度分别为317µg m−3和307µg m−3。11次沙尘暴事件，平均气溶胶浓度为1095µg m−3，而无沙天和弱风速的春季气溶胶背景负荷平均为196µg m−3。通过x射线衍射检测到的气溶胶样品中主要矿物为伊利石、高岭石、绿泥石、石英、长石、方解石和白云石。部分样品中还检出石膏、岩盐和角闪孔。亚洲沙尘以高岭石与绿泥石（K/C）比值小于1为特征，而撒哈拉沙尘的K/C比值大于2。气团反轨迹分析表明，与敦煌气溶胶粒子输送有关的路径有3个家族，但它们的K/C比值相似，这进一步表明亚洲沙尘的矿物学特征与非洲沙尘不同。
Measurements were performed in spring 2001 and 2002 to determine the characteristics of soil dust in the Chinese desert region of Dunhuang, one of the ground sites of the Asia-Pacific Regional Aerosol Characterization Experiment (ACE-Asia). The mean mass concentrations of total suspended particle matter during the spring of 2001 and 2002 were 317 µg m−3and 307 µg m−3, respectively. Eleven dust storm events were observed with a mean aerosol concentration of 1095 µg m−3, while the non-dusty days with calm or weak wind speed had a background aerosol loading of 196 µg m−3on average in the springtime. The main minerals detected in the aerosol samples by X-ray diffraction were illite, kaolinite, chlorite, quartz, feldspar, calcite and dolomite. Gypsum, halite and amphibole were also detected in a few samples. The mineralogical data also show that Asian dust is characterized by a kaolinite to chlorite (K/C) ratio lower than 1 whereas Saharan dust exhibits a K/C ratio larger than 2. Air mass back-trajectory analysis show that three families of pathways are associated with the aerosol particle transport to Dunhuang, but these have similar K/C ratios, which further demonstrates that the mineralogical characteristics of Asian dust are different from African dust.