Oxygenated and water‐soluble organic aerosols in Tokyo
Oxygenated and water‐soluble organic aerosols in Tokyo
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DOI：
10.1029/2006jd007056
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发表时间：
2007-01
影响因子：
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通讯作者：
Y. Kondo;Y. Miyazaki;N. Takegawa;T. Miyakawa;R. Weber;J. Jimenez;Q. Zhang;D. Worsnop
中科院分区：
文献类型：
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作者：
Y. Kondo;Y. Miyazaki;N. Takegawa;T. Miyakawa;R. Weber;J. Jimenez;Q. Zhang;D. Worsnop
[1]利用Aerodyne气溶胶质谱仪(AMS)和能够测量水溶性有机碳(WSOC)的颗粒到液体采样器(PILS)，于2004年冬夏在东京同时测量了亚微米有机气溶胶。这两种技术都被用来研究二次有机气溶胶(SOA)的形成，组合的数据集提供了独特的见解。在夏季，大约80%(40%-65%)的有机气溶胶在以总(碳)质量浓度衡量时被氧化，这是由于高光化学活性导致了SOA的活跃形成。在冬季，含氧有机气溶胶的比例降低到39%(总质量基)和23%(碳质量基)。以前的AMS研究表明，环境气溶胶AMS质量谱中m/z 44处的信号以CoO+为主，CoO+通常来自含氧有机气溶胶(OOA)。M/z 44处的信号和由此得到的OOA质量浓度与WSOC在整个季节都高度相关(R2=0.78-0.91)，表明OOA和WSOC在化学特征上非常相似。根据WSOC浓度与由AMS数据得出的氧化有机碳(OOC)浓度的比较，发现约88±29%的OOA是水溶性的。
[1] Submicron organic aerosol was measured simultaneously with an Aerodyne aerosol mass spectrometer (AMS) and a particle-into-liquid sampler (PILS) capable of measuring water-soluble organic carbon (WSOC) during the winter and summer of 2004 in Tokyo. Both techniques are being used to investigate the formation of secondary organic aerosol (SOA), and the combined data sets provide unique insights. In summer, about 80% (40–65%) of organic aerosols were oxygenated when scaled by total (carbon) mass concentration, due to high photochemical activity, leading to the active formation of SOA. In winter the fraction of oxygenated organic aerosol is reduced to 39% (total mass base) and 23% (carbon mass base). Previous AMS studies have shown that signals at m/z 44 of the AMS mass spectra of ambient aerosols are dominated by COO+, which typically originates from oxygenated organic aerosols (OOA). The signals at m/z 44 and the derived OOA mass concentrations were highly correlated with WSOC (r2 = 0.78–0.91) throughout these seasons, indicating that OOA and WSOC were very similar in their chemical characteristics. Approximately 88 ± 29% of OOA was found to be water soluble on the basis of the comparison of the WSOC concentrations with those of oxygenated organic carbon (OOC) derived from the AMS data.