Photochemical formation rates and optical properties of organic aerosols through time-resolved in situ laboratory measurements

Details Photochemical formation rates and optical properties of organic aerosols through time-resolved in situ laboratory measurements Photochemical formation rates and optical properties of organic aerosols through time-resolved in situ laboratory measurements

Dec 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agufmsa71a..07a&link_type=abstract

American Geophysical Union, Fall Meeting 2002, abstract #SA71A-07

Physics

0317 Chemical Kinetic And Photochemical Properties, 0343 Planetary Atmospheres (5405, 5407, 5409, 5704, 5705, 5707), 0360 Transmission And Scattering Of Radiation, 0394 Instruments And Techniques, 6297 Instruments And Techniques

Scientific paper

The presence of photochemically-generated hazes has a significant impact on radiative transfer in planetary atmospheres. While the rates of particle formation have been inferred from photochemical or microphysical models constrained to match observations, these rates have not been determined experimentally. Thus, the fundamental kinetics of particle formation are not known and remain highly parameterized in planetary atmospheric models. We have developed instrumentation for measuring the formation rates and optical properties of organic aerosols produced by irradiating mixtures of precursor gases via in situ optical (633nm) scattering and online quadrupole mass spectrometry (1-200 amu). Results for the generation of particulate hydrocarbons from the irradiation of pure, gas-phase CH4 with vacuum ultraviolet (120-160nm) light, along with simultaneous measurements of the evolution higher gas-phase hydrocarbons will be presented.

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