Measurements of OH reactivity and photochemical ozone production in the urban atmosphere
Measurements of OH reactivity and photochemical ozone production in the urban atmosphere
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DOI：
10.1021/es049457p
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发表时间：
2005-11-15
影响因子：
11.4
通讯作者：
Kajii, Y
中科院分区：
文献类型：
--
作者：
Sadanaga, Y;Yoshino, A;Kajii, Y
OH反应性的测量（即，OH损失率）是讨论对流层OH光化学的基础。在2003年7月和8月，我们观察了总OH反应在东京郊区。尽管我们测定了OH + NO2反应的速率系数，但90%以上的OH损失速率的测定值高于同时测定各种痕量组分浓度的计算值。我们的结论是，这种差异是由于存在不可测量的挥发性有机化合物（VOCs）。我们估计的情况下，包括未知物种的VOCs和排除缺失汇的光化学臭氧的生产潜力，分别。当未知物种作为VOCs包括在内时，潜在的增加从32%到88%。这一结果表明，城市空气中臭氧的光化学产生率大大高于预期。
Measurements of OH reactivity (i.e., OH loss rates) in the troposphere are essential for discussing tropospheric OH photochemistry. In July and August 2003, we observed the total OH reactivity in a suburban area of Tokyo. More than 90% of the data of the measured OH loss rates were higher than the calculated values with simultaneously measured concentrations of various trace species even though the rate coefficient of the OH + NO2 reaction was measured by us. We concluded that this discrepancy is due to the existence of unmeasured volatile organic compounds (VOCs). We estimated the potential of the photochemical ozone production in the case of including the unknown species as VOCs and excluding the missing sink, respectively. When the unknown species were included as VOCs, the potential increases from 32% to 88%. This result indicates the photochemical production rates of ozone in the urban air are substantially greater than expected.