Chemical interactions between mineral dust particles and acid gases during Asian dust events
Chemical interactions between mineral dust particles and acid gases during Asian dust events
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DOI：
10.1029/2004jd004737
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发表时间：
2005-02
影响因子：
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通讯作者：
A. Ooki;M. Uematsu
中科院分区：
文献类型：
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作者：
A. Ooki;M. Uematsu
[1]酸性气体反应过程中的通道从源区到西北太平洋修改亚洲矿物尘埃颗粒的化学特性，因为它们通过重工业地区。我们进行了气溶胶采样，调查在西北太平洋地区的高沙尘季节的矿物尘埃粒子与酸性气体的相互作用。在所有气溶胶样品中，NO3-和矿物尘埃颗粒的浓度峰值均处于粗模式范围（D > 1.25 μm），而非海盐-（nss）-SO 42-仅在经历降雨的亚洲沙尘事件中在粗模式范围内出现明显峰值。硝酸盐是与矿物尘埃颗粒相关的主要酸性物质，而不是nss-SO 42 −。在东京的城市空气中，我们还进行了一个原位实验，将环境酸性气体与装载在过滤器上的矿物粉尘颗粒反应。原位实验表明，硝酸与矿物粉尘颗粒的反应比SO2更有效。HNO 3（+NO2）和HCl占与矿物粉尘颗粒反应的酸性气体的大部分（48%和40%），而SO2占一小部分（12%）。HNO 3在矿物粉尘颗粒表面的高吸附性将使其表面性质从疏水性变为吸湿性，并形成将氮化合物去除到海洋表层的有效机制。
[1] Acid gas reactions during the passage from the source regions to the western North Pacific modify the chemical characteristics of Asian mineral dust particles as they pass through heavily industrial regions. We conducted aerosol samplings to investigate the interaction of mineral dust particles with acid gases in the western North Pacific region during the high-dust season. The concentration peaks of NO3− and mineral dust particles were in the coarse mode range (D > 1.25 μm) in all aerosol samples, while non-sea-salt-(nss)-SO42− had an apparent peak in the coarse mode range only in an Asian dust event that experienced rain. Nitrate was the dominant acid substance associated with the mineral dust particles rather than nss-SO42−. In the urban air of Tokyo we also conducted an in situ experiment to react ambient acid gases with mineral dust particle loaded on a filter. The in situ experiment indicated that HNO3 had reacted with mineral dust particles much more efficiently than SO2 had. HNO3 (+NO2) and HCl accounted for large fractions (48% and 40%) of acid gases that reacted with mineral dust particles, while SO2 accounted for a small fraction (12%). The high adsorption of HNO3 on mineral dust particles would change their surface properties from hydrophobic to hygroscopic and form an efficient mechanism to remove nitrogen compounds to the ocean surface layer.