Abstract
Abstract. The impact of condensing organic aerosols on activated cloud
number concentration is examined in a new aerosol microphysics box model,
MATRIX-VBS. The model includes the volatility basis set (VBS) framework
coupled with the aerosol microphysical scheme MATRIX (Multiconfiguration
Aerosol TRacker of mIXing state) that resolves aerosol mass and number
concentrations and aerosol mixing state. By including the condensation of
organic aerosols, the new model produces fewer activated particles compared to
the original model, which treats organic aerosols as nonvolatile. Parameters
such as aerosol chemical composition, mass and number concentrations, and
particle sizes that affect activated cloud number concentration are
thoroughly tested via a suite of Monte Carlo simulations. Results show that
by considering semi-volatile organics in MATRIX-VBS, there is a lower activated
particle number concentration, except in cases with low cloud updrafts, in
clean environments at above-freezing temperatures, and in polluted
environments at high temperatures (310 K) and extremely low-humidity
conditions.
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