Impact of in-cloud aqueous processes on the chemistry and transport of biogenic volatile organic compounds

摘要: We investigate the impacts of cloud aqueous processes on chemistry and transport biogenic volatile organic compounds (BVOC) using National Center for Atmospheric Research's large-eddy simulation code with an updated chemical mechanism that includes both gas- aqueous-phase reactions. simulate a meteorological case diurnal pattern non-precipitating cumulus clouds from Baltimore-Washington area DISCOVER-AQ campaign. evaluate two scenarios without In layer (2-3 km), addition phase reactions decreases HCHO by 18% over domain due to its solubility fast depletion reactions, resulting in corresponding decrease radical oxidants (e.g., OH). The OH increases mixing ratios isoprene MACR (100% 15%, respectively) because reaction rate is lower. Aqueous-phase can modify segregation between BVOC changing sign intensity, causing up 55% reduction isoprene-OH 40% MACR-OH when are present. Analysis covariance budget shows term primary driver strong clouds, triggered OH. All acids except acetic acid formed only through For phase, turbulence mixes these short time scales, near-surface reaching 20% within one hour formation.