Evolution of mixing state of black carbon in polluted air from Tokyo
Evolution of mixing state of black carbon in polluted air from Tokyo
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DOI：
10.1029/2007gl029819
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发表时间：
2007-08
影响因子：
5.2
通讯作者：
M. Shiraiwa;Y. Kondo;N. Moteki;N. Takegawa;Y. Miyazaki;D. Blake
中科院分区：
文献类型：
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作者：
M. Shiraiwa;Y. Kondo;N. Moteki;N. Takegawa;Y. Miyazaki;D. Blake
使用单粒子烟尘光度计（SP2）研究了东京污染空气中黑碳气溶胶（BC）混合状态的演变。2004年7月至8月期间，在东京以北50公里的郊区站点（Kisai）进行了气溶胶和痕量气体的地面测量。使用硝酸2-戊酯（2-PeONO 2）与正戊烷（n-C5 H12）的比率来推导光化学年龄。根据SP2测量，厚涂层BC的数量分数（壳/芯比>约10%）为0.001。2)核心直径为180 nm的光化学钟在海陆风环流下以1.9%h −1的速率增加。应用正矩阵因子分解，使用气溶胶质谱仪测量的硫酸盐、硝酸盐和有机物的质量浓度，研究不同涂层材料的时间依赖性贡献。本研究中发现的主要涂层材料是硫酸盐和有机物。
The evolution of the mixing state of black carbon aerosol (BC) was investigated using a single‐particle soot photometer (SP2) in polluted air transported from Tokyo. Ground‐based measurements of aerosols and trace gases were conducted at a suburban site (Kisai) 50 km north of Tokyo during July–August 2004. The ratio of 2‐pentyl nitrate (2‐PeONO2) to n‐pentane (n‐C5H12) was used to derive the photochemical age. According to the SP2 measurement, the number fraction of thickly coated BC (Shell/Corel Ratio > ca. 2) with a core diameter of 180 nm increased at the rate of 1.9% h−1, as the photochemical clock proceeded under land‐sea breeze circulation. Positive matrix factorization was applied to investigate the time‐dependent contributions of different coating materials using the mass concentrations of sulfate, nitrate, and organics measured using an aerosol mass spectrometer. The main coating materials found in this study were sulfate and organics.