Remote sensing of Asian dust at DaeJeon station in NIES lidar network

Abstract

To examine the optical characteristics of Asian dust, more than 20 lidars has been operated in NIES lidar Network. In DaeJeon station (127.34E, 36.33N), two wavelengths (532 nm/1064 nm) depolarization lidar has been applied since 2010. This lidar system is mainly consists of high power Nd:Yag laser, 300 mm telescope, and optical spectrometer with vertical and parallel depolarization channels at the two wavelengths. For the analysis of Asian dust, the particle depolarization ratios at both wavelengths were retrieved with the assumption of the mixing condition of aerosols and molecules and then the ratio between 532 nm and 1064 nm depolarization ratios was calculated. Also the ratio of backscattering coefficient between the 532 nm and 1064 nm backscatter coefficients were achieved with the depolarization ratio. To know the spatial and temporal variation of the Asian dust occurred in spring of 2011, the results of the depolarization ratios and backscatter coefficients from the lidar measurements at DaeJeon station were compared with the results measured from other lidar stations in the NIES Network. The result of backward and forward trajectory analysis coincided well with the results of lidar measurement in the Network. © 2013 Springer Science+Business Media Dordrecht.