Ozone photochemistry and elevated isoprene during the UK heatwave of August 2003
Ozone photochemistry and elevated isoprene during the UK heatwave of August 2003
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DOI：
10.1016/j.atmosenv.2006.06.057
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发表时间：
2006-12-01
影响因子：
5
通讯作者：
Jenkin, Michael E.
中科院分区：
文献类型：
--
作者：
Lee, James D.;Lewis, Alastair C.;Jenkin, Michael E.
在2003年8月发生的一次严重的全欧洲空气污染事件中，观察到了一系列的化学和物理参数。在英国伦敦郊区进行的详细地面观测表明，主要挥发性有机化合物(VOCs)、臭氧(>；110ppbV)以及其他光化学副产物(如PAN、HCHO和含氧物)水平显著升高，但NOx水平不高。反应性示踪剂结合多普勒风雷达和反向轨迹被用来确定，在这次事件中，O-3最初早上的上升是由来自欧洲大陆的区域范围内污染的高空空气夹带造成的。在这一事件中，VOC对OH的总反应性几乎翻了一番，官能团之间的分布相似，但生物异戊二烯对VOC的贡献与温度有关(最大为1.2 ppbv)。在间歇性条件下，在下午晚些时候观察到了超过60PPTV的总过氧自由基，并与臭氧的较晚和较高的峰值有很强的相关性。通过PAN在高温下的热解离，计算了过氧乙酰基对间歇性烷基过氧基的影响。(C)2006爱思唯尔有限公司。保留所有权利。
A wide range of chemical and physical parameters has been observed over the course of a severe Europe-wide air pollution episode in August 2003. Detailed surface observations made at the rural perimeter edge of London, UK, indicated significantly elevated levels of primary volatile organic compounds (VOCs), ozone (> 110ppbV), other photochemical by-products such as PAN, HCHO, and oxygenates but not NOx. Reactive tracers in combination with Doppler wind radar and back trajectories have been used to establish that initial morning rises in O-3 during the episode were caused by entrainment of air from aloft, polluted on regional scales from mainland Europe. Total VOC reactivity to OH approximately doubled during this episode, with similar distribution between functional groups, but showing a temperature dependent contribution from biogenic isoprene (maximum 1.2 ppbv). Under episodic conditions total peroxy radicals in excess of 60 pptv were observed in late afternoon with strong correlation to a later and higher peak in ozone. Episodic alkyl peroxy radicals were calculated to be substantially influenced by peroxy acetyl, via the thermal dissociation of PAN at high temperatures. (c) 2006 Elsevier Ltd. All rights reserved.