TY - JOUR
T1 - Modeling the influence of aerosols on cloud microphysical properties in the east asia region using a mesoscale model coupled with a bin-based cloud microphysics scheme
AU - Iguchi, Takamichi
AU - Nakajima, Teruyuki
AU - Khain, Alexander P.
AU - Saito, Kazuo
AU - Takemura, Toshihiko
AU - Suzuki, Kentaroh
PY - 2008
Y1 - 2008
N2 - A bin-based microphysics scheme for cloud is implemented into a three-dimensional nonhydrostatic model and off-line coupled with a global aerosol transport model to reproduce realistic and inhomogeneous condensation nuclei (CN) fields. This coupling makes it possible to calculate cloud microphysical properties over a larger area under more realistic environmental conditions. Using the model, nested grid simulations are performed for two precipitation events associated with transitional synoptic-scale forcing during the spring over an area of the East China Sea. The nested grid simulations reproduce the general features of the horizontal distributions of variables such as effective droplet radius derived from satellite data retrieval. Comparison of the relationships among simulated cloud variables with those among satellite-derived variables reveals that the implementation of an inhomogeneous CN field results in a more accurate simulation of the distribution of cloud microphysical properties. Sensitivity tests with respect to CN concentration show that the simulated area and amount of precipitation are slightly affected by the CN concentration. Comparative simulations using bin-based and bulk microphysical schemes indicate that the difference in cloud microphysics has little effect on precipitation except over the areas of elevated pollution (i.e., elevated CN). Comparison with previous reports indicates that the precipitation response to aerosols is dependent on the environmental conditions and the type of the cloud system.
AB - A bin-based microphysics scheme for cloud is implemented into a three-dimensional nonhydrostatic model and off-line coupled with a global aerosol transport model to reproduce realistic and inhomogeneous condensation nuclei (CN) fields. This coupling makes it possible to calculate cloud microphysical properties over a larger area under more realistic environmental conditions. Using the model, nested grid simulations are performed for two precipitation events associated with transitional synoptic-scale forcing during the spring over an area of the East China Sea. The nested grid simulations reproduce the general features of the horizontal distributions of variables such as effective droplet radius derived from satellite data retrieval. Comparison of the relationships among simulated cloud variables with those among satellite-derived variables reveals that the implementation of an inhomogeneous CN field results in a more accurate simulation of the distribution of cloud microphysical properties. Sensitivity tests with respect to CN concentration show that the simulated area and amount of precipitation are slightly affected by the CN concentration. Comparative simulations using bin-based and bulk microphysical schemes indicate that the difference in cloud microphysics has little effect on precipitation except over the areas of elevated pollution (i.e., elevated CN). Comparison with previous reports indicates that the precipitation response to aerosols is dependent on the environmental conditions and the type of the cloud system.
UR - http://www.scopus.com/inward/record.url?scp=68249119553&partnerID=8YFLogxK
U2 - 10.1029/2007JD009774
DO - 10.1029/2007JD009774
M3 - ???researchoutput.researchoutputtypes.contributiontojournal.article???
AN - SCOPUS:68249119553
SN - 0148-0227
VL - 113
JO - Journal of Geophysical Research
JF - Journal of Geophysical Research
IS - 14
M1 - D14215
ER -