Evolution of submicron organic aerosol in polluted air exported from Tokyo
Evolution of submicron organic aerosol in polluted air exported from Tokyo
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DOI：
10.1029/2006gl025815
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发表时间：
2006-08
影响因子：
5.2
通讯作者：
N. Takegawa;T. Miyakawa;Y. Kondo;D. Blake;Y. Kanaya;M. Koike;M. Fukuda;Y. Komazaki;Y. Miyazaki;A. Shimono;T. Takeuchi
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文献类型：
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作者：
N. Takegawa;T. Miyakawa;Y. Kondo;D. Blake;Y. Kanaya;M. Koike;M. Fukuda;Y. Komazaki;Y. Miyazaki;A. Shimono;T. Takeuchi
2004年7月至8月期间，在东京的一个市区站点(Komaba)和以北50公里处的一个站点(Kisai)进行了气溶胶和微量气体的地面测量。在每个测点安装了Aerodyne气溶胶质谱仪(AMS)，以研究污染空气中亚微米有机气溶胶(OA)的化学演化。Kisai站点的OA质量浓度系统性地高于Komaba站点的质量浓度，并且在偏南条件下与臭氧相关。利用烷基硝酸盐与母体碳氢化合物之比得出的光化学年龄，研究了Kisai位置的OA的增加速率。经过处理的空气(8~16h龄)中的OA浓度是新鲜排放物(∼0龄)中的4~5倍，这表明在高光化学活性条件下，∼0.5d内可以显著提高OA浓度。
Ground‐based measurements of aerosols and trace gases were conducted at an urban site in Tokyo (Komaba) and a site 50 km to the north (Kisai) during July–August 2004. An Aerodyne aerosol mass spectrometer (AMS) was deployed at each measurement site to investigate the chemical evolution of submicron organic aerosol (OA) in polluted air. The mass concentrations of OA at the Kisai site were systematically higher than those at the Komaba site and were correlated with ozone under southerly conditions. The rate of increase of OA at the Kisai site is investigated using the photochemical age derived from the ratio of alkyl nitrates to their parent hydrocarbons. The OA concentrations in processed air (age of 8–16 h) were 4–5 times larger than those in fresh emissions (age ∼ 0), suggesting that the OA concentrations can be significantly enhanced within ∼0.5 days under conditions of high photochemical activity.