HOx radical regeneration in the oxidation of isoprene.
We propose, and quantify from first principles, two novel HO(x)-regenerating unimolecular reactions in isoprene oxidation, which are estimated to yield in pristine tropical forest conditions about 0.7 HO(2) and 0.03 OH radicals per isoprene oxidized; it is further argued that the photolabile coproduct of HO(2) can be a major source of OH, with a yield of the order of 1. The newly proposed chemistry could provide a rationalization for the unexpectedly high OH concentrations often observed in forested environments, such as over the Amazon forest in the recent Gabriel campaign.
Peeters
J
J
Department of Chemistry, K.U. Leuven, Celestijnenlaan 200F, B-3001, Leuven, Belgium. Jozef.Peeters@chem.kuleuven.be
Nguyen
T L
TL
Vereecken
L
L
D002070:Butadienes / Q000737:chemistry / Q000378:metabolism*; D045782:Hemiterpenes / Q000737:chemistry / Q000378:metabolism*; D006878:Hydroxides / Q000737:chemistry*; D010084:Oxidation-Reduction; D010420:Pentanes / Q000737:chemistry / Q000378:metabolism*; D014197:Trees / Q000737:chemistry*; D014867:Water / Q000737:chemistry*
D002070:Butadienes; D045782:Hemiterpenes; D006878:Hydroxides; D010420:Pentanes; D014867:Water; C005059:isoprene