Unexpected Epoxide Formation in the Gas-Phase Photooxidation of Isoprene Export

@article{citeulike:5421902, abstract = {Emissions of nonmethane hydrocarbon compounds to the atmosphere from the biosphere exceed those from anthropogenic activity. Isoprene, a five-carbon diene, contributes more than 40\% of these emissions. Once emitted to the atmosphere, isoprene is rapidly oxidized by the hydroxyl radical OH. We report here that under pristine conditions isoprene is oxidized primarily to hydroxyhydroperoxides. Further oxidation of these hydroxyhydroperoxides by OH leads efficiently to the formation of dihydroxyepoxides and OH reformation. Global simulations show an enormous flux--nearly 100 teragrams of carbon per year--of these epoxides to the atmosphere. The discovery of these highly soluble epoxides provides a missing link tying the gas-phase degradation of isoprene to the observed formation of organic aerosols. 10.1126/science.1172910}, author = {Paulot, Fabien and Crounse, John D. and Kjaergaard, Henrik G. and Kurten, Andreas and St. Clair, Jason M. and Seinfeld, John H. and Wennberg, Paul O.}, citeulike-article-id = {5421902}, citeulike-linkout-0 = {http://dx.doi.org/10.1126/science.1172910}, citeulike-linkout-1 = {http://www.sciencemag.org/cgi/content/abstract/325/5941/730}, citeulike-linkout-2 = {http://view.ncbi.nlm.nih.gov/pubmed/19661425}, citeulike-linkout-3 = {http://www.hubmed.org/display.cgi?uids=19661425}, day = {7}, doi = {10.1126/science.1172910}, journal = {Science}, keywords = {atmosphere, biosphere, climate, clouds}, month = {August}, number = {5941}, pages = {730--733}, posted-at = {2009-08-12 00:59:46}, priority = {2}, title = {Unexpected Epoxide Formation in the Gas-Phase Photooxidation of Isoprene}, url = {http://dx.doi.org/10.1126/science.1172910}, volume = {325}, year = {2009} }

TY - JOUR ID - citeulike:5421902 L3 - citeulike-article-id:5421902 N2 - Emissions of nonmethane hydrocarbon compounds to the atmosphere from the biosphere exceed those from anthropogenic activity. Isoprene, a five-carbon diene, contributes more than 40% of these emissions. Once emitted to the atmosphere, isoprene is rapidly oxidized by the hydroxyl radical OH. We report here that under pristine conditions isoprene is oxidized primarily to hydroxyhydroperoxides. Further oxidation of these hydroxyhydroperoxides by OH leads efficiently to the formation of dihydroxyepoxides and OH reformation. Global simulations show an enormous flux--nearly 100 teragrams of carbon per year--of these epoxides to the atmosphere. The discovery of these highly soluble epoxides provides a missing link tying the gas-phase degradation of isoprene to the observed formation of organic aerosols. 10.1126/science.1172910 IS - 5941 JF - Science EP - 733 TI - Unexpected Epoxide Formation in the Gas-Phase Photooxidation of Isoprene VL - 325 SP - 730 KW - atmosphere KW - biosphere KW - climate KW - clouds AU - Paulot, Fabien AU - Crounse, John AU - Kjaergaard, Henrik AU - Kurten, Andreas AU - St. Clair, Jason AU - Seinfeld, John AU - Wennberg, Paul PY - 2009/08/07/ UR - http://dx.doi.org/10.1126/science.1172910 ER -