Kazuma Aoki - 613 Special Seminar

University of Toyama
We provide the information, in this presentation, on the optical properties of aerosol with respect to their temporal and spatial variability by using SKYENT Sky radiometers. The global distributions of aerosol have been derived from earth observation satellite data, and have been simulated in numerical model, which assume optical parameters. However, these distributions are difficult to derive because of variability in time and/or space. Therefore, Aerosol optical properties were investigated using the measurements from ground-based and ship-borne sky radiometer (POM-01, & -02: Prede Co. Ltd., Tokyo, Japan). We started the monitoring of aerosols optical characteristics since 1994, by using a sky radiometer (http://skyrad.sci.u-toyama.ac.jp/). The sky radiometer is an automatic instrument that takes observations only in daytime under the clear sky conditions every ten minutes by once. The aerosol optical characteristics were computed using the SKYRAD.pack version 4.2 developed by Nakajima et al. (1996). The obtained Angsrom parameters (i.e., aerosol optical thickness and Angstrom exponent) clearly showed spatial variability over the Japan. We present the temporal and spatial variation and the relationship of Angsrom parameters and applied to validation of satellite retrievals and numerical models.