Large-eddy simulation of biogenic VOC chemistry during the DISCOVER-AQ 2011 campaign

摘要: Biogenic volatile organic compounds (BVOCs) are oxidized quickly in the atmosphere to form oxygenated VOC (OVOC) and play crucial roles formation of ozone secondary aerosols. We use National Center for Atmospheric Research's large-eddy simulation model Deriving Information on Surface Conditions from Column Vertically Resolved Observations Relevant Air Quality 2011 flight data understand role boundary layer turbulence atmospheric chemistry key BVOC species their oxidation products. simulate three distinct convective environments during campaign, representing fair weather conditions (case 1: 1 July), a event dominated by southwesterly flow 2: 11 polluted with high temperature convection 3: 29 July). Isoprene segregation is greatest lower under warm conditions, reaching up 10% reduction isoprene-OH reaction rate. Under lifetimes lengthen due increased isoprene emission, elevated initial chemical concentrations, OH competition. Although turbulence-driven has less influence OVOC species, mixes more into upper (ABL) increases total reactivity. Production loss rates above 2 km all cases indicate situ addition vertical transport surface aloft, consistent contribution reactivity OVOC. Together, these results show that ABL warmer stronger enhanced emission formation.