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Ozone photochemistry and elevated isoprene during the UK heatwave of august 2003 [An article from: Atmospheric Environment]
Book Details
PublisherElsevier
ISBN / ASINB000PBZVIA
ISBN-13978B000PBZVI2
AvailabilityAvailable for download now
Sales Rank99,999,999
MarketplaceUnited States 🇺🇸
Description
This digital document is a journal article from Atmospheric Environment, published by Elsevier in 2006. The article is delivered in HTML format and is available in your Amazon.com Media Library immediately after purchase. You can view it with any web browser.
Description:
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 NO"x. 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 1.2ppbv). Under episodic conditions total peroxy radicals in excess of 60pptv 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.
Description:
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 NO"x. 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 1.2ppbv). Under episodic conditions total peroxy radicals in excess of 60pptv 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.
