Importance of global aerosol modeling including secondary organic aerosol formed from monoterpene

  • Goto D
  • Takemura T
  • Nakajima T
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A global three-dimensional aerosol transport-radiation model, coupled
to an atmospheric general circulation model (AGCM), has been extended
to improve the model process for organic aerosols, particularly secondary
organic aerosols (SOA), and to estimate SOA contributions to direct
and indirect radiative effects. Because the SOA formation process
is complicated and unknown, the results in different model simulations
include large differences. In this work, we simulate SOA production
assuming various parameterizations of (1) primary organic aerosols
(POA) mass concentrations, (2) oxidant species concentrations, and
(3) volatile organic compound (VOC) concentrations in the SOA formation
through gas-to-particle conversion governed by equilibrium partitioning
of monoterpene oxidation products. Comparisons of results from observations,
other models, and our simulations with/without the SOA partitioning
theory lead to some findings of the influence of SOA on the radiation
and cloud fields. First, the SOA number concentrations control cloud
droplet effective radii near water cloud tops in the tropics and
can affect the estimation of the aerosol indirect radiative effect.
Second, SOA simulation results strongly depend on POA concentrations
and emission data, so that disregarding this dependence may lead
to a significant underestimation of the aerosol radiative effect
because most of other studies assume that the SOA production level
in the preindustrial era is same as in the current level. The global
annual mean production of SOA formed from monoterpene is evaluated
in this study as 6.74 Tg a−1, and the global annual mean radiative
forcings of the direct and indirect effects by SOA from monoterpene
are calculated to be –0.01 and –0.19 W m−2, respectively.

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