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The reactions of ozone with alkenes: An important source of HO x in the boundary layer
Author(s) -
Paulson Suzanne E.,
Orlando John J.
Publication year - 1996
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/96gl03477
Subject(s) - radical , isoprene , alkene , ozone , primary (astronomy) , chemistry , boundary layer , atmospheric chemistry , photochemistry , environmental chemistry , catalysis , thermodynamics , organic chemistry , astrophysics , physics , polymer , copolymer
The reactions of ozone with alkenes have been shown recently to lead to the direct production of OH radicals. Organic peroxy radicals (RO 2 ) probably accompany the production of OH. In this paper, we draw attention to the potential importance of these reactions in the primary production of HO x (HO x = OH, HO 2 and RO 2 ) radicals in various regions of the boundary layer. The reactions of ozone with anthropogenic alkenes are shown to be the most important source of HO x in many urban settings during the day and evening, and a significant source at night. The majority of HO x comes from trace quantities of alkenes with internal double bonds. Reaction of O 3 with isoprene and terpenes can be an important source of HO x in forested regions; we show that these reactions are the dominant radical source in the late afternoon and into the night. This additional HO x source is expected to increase predicted OH concentrations compared to those calculated by models that do not include the O 3 ‐alkene source.