Aerosol properties over Japan by sun/sky photometry during APEX-E3

摘要

This work describes the optical properties of aerosols derived by sun/sky radiometry over Japan during APEX-E3 from March to May in 2003. Two Cimel Sun/sky radiometer (CE-318-2 and CE-318-1) and a Prede Sky radiometer (POM-100P) were set up at Noto, Shirahama, and Fukue-jima site. These radiometers are available for direct- or diffuse-solar radiation measurements in order to derive the aerosol optical thickness, size distribution, and so on. Four large aerosol events [ a) March 14, b) March 25-27, c) April 12-13, and d) May 20-24 ] were observed from March to May in 2003. Event- a and -b are described by anthropogenic particles. The event-c is the typical Asian dust event which is indicated by small Angstrom values and peek of particle radius ～1-2 μm. The event-d results in the Siberian large bio-mass burning plume. It is of interest to mention that both events b and c are confirmed by the NOAA's HYSPLIT backward trajectory simulations in order to investigate the aerosol origins.