SUNYA regional climate model (RCM; Cheng and Wang, 2006) was incorporated with available dust emission, transport, and deflation modules of Wang et al. (2000) and Chen et al. (2004). On-line experiment was conducted for April of 2001 and 2003. ECMWF TOGA and NCEP reanalysis datasets were used for the initial and boundary conditions. For the model validation, TOMS AI data was compared with aerosol mass concentration. The SSiB scheme, which is designed for land-surface interactions, in SUNYA-RCM is a useful tool to study this topic.
For the basic climatology validation, the overall spatial distribution and temporal evolution of wind speed, relative humidity, and temperature are reasonably well captured, while they have mean bias errors. Since sensitivity test reveals surface wind speed and relative humidity as the most critical factors affecting dust emission, their mean bias errors were corrected for model application. Therefore, the model-observation comparisons suggest that the model is capable of simulating the evolution of the dust storms over this region.
Model-simulated aerosol mass concentration was validated against satellite and surface station datasets. Moreover, to investigate the relationship between dust and the climate system, the diurnal variations of dust loading and dust radiative forcing were examined and as well surface temperature.
It is expected that a diurnal cycle of dust radiative forcing is closely related to those of dust loading and surface temperature.