Asian dust event observed in Seoul, Korea, during 29-31 May 2008: analysis of transport and vertical distribution of dust particles from lidar and surface measurements.

摘要: Abstract In this study, we investigate the transport of dust particles, its vertical distribution, and associated meteorological conditions during an Asian event that was observed in Seoul, Korea on May 29–31, 2008. This study analyzes data from ground-based space-borne 2-wavelength polarization lidars, particulate mass concentrations, synoptic weather data. Surface station observations phenomena, model, maps consistently show particles were transported source regions (Inner Mongolia, Man-Ju, Ordos areas) to via northeastern part China. Network PM 10 concentrations revealed a majority heavy traveled across South northwest southeast direction with horizontal scale 250–300 km traveling speed approximately 40 km h − 1 . extraordinary event, terms intensity timing year, occurred due blockage unusually intensified low-pressure system China as well high-pressure centered over Sea Okhotsk Kuril Islands. The low values particle depolarization ratio ( δ 532 ) (≤0.05) color (CR) pre-dust period indicate presence spherical, non-dust, relatively small particles. mean value 0.123 ± 0.069 between altitudes ground ~ 2.8 km, 0.161 ± 0.049 for near-surface layer (ground ~ 1.2 km). is quite similar obtained 3-year SNU-Lidar measurements Seoul ~0.136 ± 0.027). 2nd multilayered episode ranged 0.081 0.120 layers, 0.076 0.114 elevated layers. CALIPSO β , CR also dense aerosols along route.