A comprehensive characterisation of Asian dust storm particles: chemical composition, reactivity to SO 2 , and hygroscopic property
A comprehensive characterisation of Asian dust storm particles: chemical composition, reactivity to SO 2 , and hygroscopic property
复制标题
DOI：
10.5194/acpd-10-8899-2010
复制
发表时间：
2010-04
影响因子：
6.3
通讯作者：
Q. Ma;Y. Liu;C. X. Liu;Jinglong Ma;Hongquan He
中科院分区：
文献类型：
--
作者：
Q. Ma;Y. Liu;C. X. Liu;Jinglong Ma;Hongquan He
抽象的。矿物粉尘占全球气溶胶含量的很大一部分。然而，由于其成分和物理化学性质的复杂性，它仍然是未来气候预测中最大的不确定性。本研究使用了多种分析方法，包括 SEM-EDX、FTIR、BET、TPD/mass 和 Knudsen cell/mass 来表征亚洲沙尘暴颗粒。研究了SO 2 的形貌、元素分数、来源分布、SO 2 真实吸收系数和吸湿行为。亚洲沙尘暴颗粒物的主要成分为铝硅酸盐、SiO 2 和CaCO 3 ，并被有机化合物和无机硝酸盐包裹。沙尘暴颗粒对SO 2 的反应性较低(真实吸收系数为5.767×10 -6 )，这限制了沙尘暴期间SO 2 向硫酸盐的转化。低反应性还表明，SO 2 的非均相反应在干燥和潮湿空气条件下对灰尘颗粒的吸湿行为影响很小。这些结果表明，沙尘暴对大气SO 2 去除的影响不应被高估。
Abstract. Mineral dust comprises of a significant fraction of the globe's aerosol loading. Yet it remains the largest uncertainty in future climate predictions due to the complexity in its components and physico-chemical properties. Multi-analysis methods, including SEM-EDX, FTIR, BET, TPD/mass, and Knudsen cell/mass, were used in the present study to characterise Asian dust storm particles. The morphology, element fraction, source distribution, true uptake coefficient of SO 2 and hygroscopic behaviour were studied. The major components of Asian dust storm particles were found to consist of aluminosilicate, SiO 2 , and CaCO 3 , which were coated with organic compounds and inorganic nitrate. The dust storm particles have a low reactivity to SO 2 (true uptake coefficient of 5.767×10 −6 ) which limits the conversion of SO 2 to sulfate during a dust storm period. The low reactivity also demonstrated that the heterogeneous reaction of SO 2 , in both dry and humid air conditions, had little effect on the hygroscopic behaviour of the dust particles. These results indicate that the impact of dust storms on atmospheric SO 2 removal should not be overestimated.