HR: 1340h
AN: A43A-0879    [Abstracts]
TI: Ambient air measurements of monoterpenes, oxygenated terpenes, and sesquiterpenes
AU: * Bouvier-Brown, N C
EM: nbouvier@nature.berkeley.edu
AF: University of California, Berkeley, 40 Hilgard Hall, Berkeley, CA 94720, United States
AU: Goldstein, A H
EM: ahg@nature.berkeley.edu
AF: University of California, Berkeley, 40 Hilgard Hall, Berkeley, CA 94720, United States
AB: Chemical ozone loss within the forest canopy and the presence of biogenic VOC (BVOC) oxidation products in and above the canopy indirectly suggest the presence of very reactive BVOCs at Blodgett Forest. As a part of the 2007 BEARPEX campaign at this coniferous forest in the Sierra Nevada Mountains of California (1300 m elevation, 38.90° N, 120.63° W,), we quantified ambient concentrations of terpenes using a modified in-situ gas chromatograph with a mass spectrometer and a flame ionization detector (GC-MS-FID). The range of terpenes observed in ambient air matched enclosure based measurements of branch level emissions. To our knowledge, these observations represent the first quantification of the oxygenated monoterpene methyl chavicol and various sesquiterpenes in ambient air. Details of the instrument modifications, diurnal profiles of the terpenes, and comparison to branch level emissions will be presented.
DE: 0315 Biosphere/atmosphere interactions (0426, 1610)
DE: 0426 Biosphere/atmosphere interactions (0315)
DE: 1610 Atmosphere (0315, 0325)
SC: Atmospheric Sciences [A]
MN: 2007 Fall Meeting