AAAR 36th Annual Conference October 16 - October 20, 2017 Raleigh Convention Center Raleigh, North Carolina, USA
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Recommended Reactive Uptake Coefficients for Uptake of Glyoxal and Methylglyoxal by Several Aerosol Types and Cloud Droplets in Atmospheric Chemistry Models
Leah Curry, V. FAYE MCNEILL, Columbia University
Abstract Number: 139 Working Group: There Must be Something in the Water: Cloud, Fog and Aerosol Aqueous Chemistry for Aerosol Production
Abstract Reactive uptake of glyoxal and methylglyoxal to aerosol particles and cloud droplets has been a source of secondary organic aerosol material in some chemical transport models for the past decade. We have calculated updated values of the reactive uptake coefficient, γ, for the uptake of glyoxal and methylglyoxal to several aerosol types and cloud droplets, starting from fundamental aqueous chemical kinetics and mass transfer considerations. We considered the nitrate/sulfate/ammonium system and sea salt particles, over a range of relative humidities and for several particle sizes. ISORROPIA was used to determine the equilibrium aerosol composition, and Henry’s Law constants for the multi-component mixtures were calculated, taking into account salting effects. γ values were calculated based on GAMMA, the McNeill group model of multiphase atmospheric chemistry, following Hanson, Solomon, and Ravishankara (1994).
Recommended values range over several orders of magnitude and in many cases are significantly lower than the values currently used in atmospheric chemical transport models.