Characterization of Asian Tropospheric Aerosols with Multi-wavelength Mie-Raman Lidar and Skyradiometer

摘要

[ABSTRACT] We have extensively observed tropospheric aerosols with lidar and Sun/sky radiometer in Tokyo. Recently, we have extended the lidar system to dual-wavelength Raman lidar (The primary laser wavelengths are 355 and 532 nm.). We found that the intensive optical properties such as Angstrom exponent and lidar ratios derived from the Raman lidar measurements are quite useful to characterize the aerosols resolving with height. As highlighted examples, we will show the case studies of Asian dust and Siberian smoke. For the smoke case (as spherical aerosol case), we retrieved the microphysical properties by applying an inversion with regularization. The results show an accumulation-mode dominate size-distribution and a low absorption; the effective radius and the single scattering albedo are ～0.22μm and～0.95, respectively. The column-averaged microphysical properties derived from the skyradiometer are also consistent with the results. We also estimated the aerosol direct radiative forcing using the microphysical properties. Further systematic analyses and improvement of lidar system are now in progress.