A11T-02
Hydroxyl, hydroperoxyl, and OH reactivity during the FIXCIT study in the CalTech environmental chamber in January 2014
Monday, 14 December 2015: 08:25
3004 (Moscone West)
William H Brune1, Li Zhang2, John Seinfeld3, Geoffrey S Tyndall4, Alex Teng3, Jason Michael St Clair3, Tran Nguyen3, Paul O Wennberg5, John Crounse6, David Owen Miller1, Frank N Keutsch7, Paul Romer8, Philip Allen Feiner1, Rebecca Schwantes3 and FIXCIT Science Team, (1)Pennsylvania State University Main Campus, University Park, PA, United States, (2)Pennsylvania State Univ, University Park, PA, United States, (3)California Institute of Technology, Pasadena, CA, United States, (4)Natl Ctr Atmospheric Research, Boulder, CO, United States, (5)California Institute of Technology, Division of Engineering and Applied Science, Pasadena, CA, United States, (6)California Institute of Technology, Division of Geological and Planetary Sciences, Pasadena, CA, United States, (7)Harvard University, Cambridge, MA, United States, (8)University of California Berkeley, Berkeley, CA, United States
Abstract:
Progress is being made in understanding the oxidation chemistry in forests that are rich in biogenic volatile organic compounds (BVOCs). Newly described detailed chemical mechanisms are able to describe the newly measured BVOC oxidation products, bringing measurements and model closer together. At the same time, new measurement strategies have surmounted recently discovered interferences in some instruments that measure hydroxyl and hydroperoxyl and the measured hydroxyl now appears to be in much better agreement with the model values. While some of this progress has been made by making measurements in the forests, much of it has been made with studies in laboratories and environmental chambers. In this presentation, we report on the measurements of hydroxyl, hydroperoxyl, and OH reactivity that were made during the FIXCIT campaign in the CalTech environmental chamber in January 2014. These measurements will be compared to other methods of determining these species and to model results. In addition, we will present observations of the behavior of the OH interference signal observed by our instrument and will speculate on its possible cause.
