Equilibrium size of atmospheric aerosol sulfates as a function of the relative humidity
Equilibrium size of atmospheric aerosol sulfates as a function of the relative humidity
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DOI：
10.1029/jd094id05p06442
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发表时间：
1989-05
影响因子：
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通讯作者：
P. Koutrakis;J. M. Wolfson;J. Spengler;B. Stern;C. Franklin
中科院分区：
文献类型：
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作者：
P. Koutrakis;J. M. Wolfson;J. Spengler;B. Stern;C. Franklin
1986年夏天，在安大略的邓恩维尔，使用微孔级联冲击采样器收集了分级的酸性气溶胶，作为加拿大国家卫生和福利部赞助的加拿大儿童急性呼吸影响研究（CARES）的一部分。硫酸根离子和氢离子显示出相似的尺寸分布。H/sup +//SO/sub 4//sup 2/minus/的摩尔比随粒径变化不大，但气溶胶酸含量随时间变化很大。还发现硫酸盐的几何平均空气动力学直径与环境相对湿度（RH）之间存在明显的关系。在这项研究中观察到的大气硫酸盐颗粒尺寸略高于在相应的湿度实验室实验中发现的。然而，考虑到所涉及的不确定性，现场和实验室数据之间的协议是显着的。美国地球物理联合会1989年
Size-fractionated acid aerosols were collected, using a microorifice cascade impactor, during the summer of 1986 in Dunnville, Ontario, as part of the Canadian Children Acute Respiratory Effects Study (CARES), sponsored by the Department of National Health and Welfare, Canada. Sulfate and hydrogen ions showed similar size distributions. The molar ratio of H/sup +//SO/sub 4//sup 2//minus/ varied little with particle size, but there was a considerable time-dependent variation in aerosol acid content. It was also found that there is a distinct relationship between the geometric mean aerodynamic diameter of sulfate, /ital d//sub a/, and ambient relative humidity (RH). Atmospheric sulfate particle sizes observed in this study were slightly higher than those found in laboratory experiments at corresponding humidities. However, considering the uncertainties involved, the agreement between the field and laboratory data was remarkable. /copyright/ American Geophysical Union 1989