X. Lin et al., PARAMETERIZATION OF SUBGRID SCALE CONVECTIVE CLOUD TRANSPORT IN A MESOSCALE REGIONAL CHEMISTRY MODEL, JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES, 99(D12), 1994, pp. 25615-25630
A parameterization of subgrid scale convective cloud vertical mixing h
as been developed in the National Oceanic and Atmospheric Administrati
on Aeronomy Laboratory three-dimensional regional chemistry model. The
parameterization is evaluated by comparing model results (with and wi
thout the cloud mixing parameterization) with observations of O-3, NOx
, and NOy made onboard the National Center for Atmospheric Research Sa
breliner aircraft during the 1990 Rural Oxidants in the Southern Envir
onment campaign in Alabama. Our studies show that model results with a
nd without the cloud transport significantly differ from each other wh
en convective clouds are present, implying that cloud exchange is an i
mportant process in determining the distributions of trace species. Ou
r studies also show that model results with the cloud transport parame
terization are in much better agreement with the aircraft observations
than those without.