摘要：All estimates of aerosol indirect effects on the global energy balance have either completely
neglected the influence of aerosol on convective clouds or treated the influence in a highly
parameterized manner. Embedding cloud-resolving models (CRMs) within each grid cell of
a global model provides a multiscale modeling framework for treating both the influence of
aerosols on convective as well as stratiform clouds and the influence of clouds on the
aerosol, but treating the interactions explicitly by simulating all aerosol processes in the
CRM is computationally prohibitive. An alternate approach is to use horizontal
statistics (e.g., cloud mass flux, cloud fraction, and precipitation) from the CRM
simulation to drive a single-column parameterization of cloud effects on the aerosol
and then use the aerosol profile to simulate aerosol effects on clouds within the
CRM. Here, we present results from the first component of the Explicit-Cloud
Parameterized-Pollutant parameterization to be developed, which handles vertical
transport of tracers by clouds. A CRM with explicit tracer transport serves as a
benchmark. We show that this parameterization, driven by the CRM's cloud
mass fluxes, reproduces the CRM tracer transport significantly better than a
single-column model that uses a conventional convective cloud parameterization.
