Diagnosis of photochemical ozone production rates and limiting factors in continental outflow air masses reaching Fukue Island, Japan: Ozone-control implications
Diagnosis of photochemical ozone production rates and limiting factors in continental outflow air masses reaching Fukue Island, Japan: Ozone-control implications
复制标题
DOI：
10.4209/aaqr.2015.04.0220
复制
发表时间：
2016-02
影响因子：
4
通讯作者：
Y. Kanaya;H. Tanimoto;Y. Yokouchi;F. Taketani;Y. Komazaki;H. Irie;H. Takashima;Xiaole Pan;S. Nozoe;S. Inomata
中科院分区：
文献类型：
--
作者：
Y. Kanaya;H. Tanimoto;Y. Yokouchi;F. Taketani;Y. Komazaki;H. Irie;H. Takashima;Xiaole Pan;S. Nozoe;S. Inomata
春季，大陆外流气团到达日本西部，携带着亚洲大陆上空产生的高水平臭氧，促进了原地臭氧的产生。在这项研究中，强调了现场生产;在2009年5月至6月期间的17天内，当大陆外流气团到达时，使用基于观测的建模方法，在日本西部的一个偏远岛屿上，对净臭氧生产的速率和限制因素进行了诊断。据估计，平均臭氧产量为每天6.8 ppb。关于到达的空气团的化学状态的信息很重要，因为它影响到日本国内排放的前体增加后空气团中臭氧的进一步产生。这种气团产生臭氧的主要限制因素通常是氮氧化物（NOx），这表明国内氮氧化物排放控制对于进一步减少臭氧的产生非常重要。挥发性有机化合物（VOCs）也增加了臭氧的产生率，偶尔（14%的时间）成为主要的控制因素。这一分析表明，日本政府最近制定的VOC削减立法应该是有效的。VOC限制的条件下发生，特别是当空气质量在6 - 8小时内，通过朝鲜半岛。控制臭氧生成的自由基化学机制的不确定性产生了不可忽视的影响，但与政策有关的主要结论没有改变。当链终止增加HO 2 + NO/NO2反应在H2O的存在下，通过气溶胶颗粒表面上的HO 2的非均匀损失，最近证实或假设，每天的臭氧生产率下降了24%，和小时数时，VOC限制条件发生变化从14%到13 - 26%。
ABSTRACTAsian continental outflow air masses reach western Japan in the springtime, carrying high levels of ozone produced over the Asian continent, and facilitating in-situ production. In this study, in-situ production was highlighted; the rate and limiting factors of net ozone production were diagnosed at Fukue Island, a remote island west of Japan, on 17 days during May–June 2009, when the continental outflow air mass arrived, using an observation-based modeling approach. The average ozone production was estimated to be 6.8 ppb per day. Information on the chemical status of the arriving air mass is important, because it affects how further ozone production in the air mass occurs after precursor addition from Japanese domestic emissions. The main limiting factor of ozone production for such air masses was usually nitrogen oxides (NOx), suggesting that domestic NOx emission control is important in reducing further ozone production. Volatile organic compounds (VOCs) also increased the ozone production rate, and occasionally (14% of time) became the dominant controlling factor. This analysis implies that the VOC reduction legislation recently enacted by the Japanese government should be effective. VOC-limited conditions occurred particularly when the air mass traveled within 6‒8 h, via the Korean Peninsula. The uncertainty in the radical chemistry mechanism governing ozone production had a non-negligible impact, but the main conclusion relevant to policy was not altered. When chain termination was augmented by HO2 + NO/NO2 reactions in the presence of H2O and by heterogeneous loss of HO2 on aerosol particle surfaces, as recently verified or hypothesized, the daily ozone production rate decreased by up to 24%, and the fraction of hours when the VOC-limited condition occurred varied from 14% to 13‒26%.