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Aerosol optical and microphysical properties as derived from collocated measurements using polarization lidar and direct sampling
Abstract Collocated and simultaneous measurements of aerosols near the ground were conducted using a lidar and aerosol sampler at Tsukuba, Japan, to clarify the relationship between lidar-derived optical properties and in-situ microphysical properties. The total linear particle depolarization ratio (δ p) ranged from 14% to 18% when nonspherical mineral dust particles were predominant in the supermicrometer range on May 7–8, 2008, whereas it ranged from 6% to 7% when spherical sea-salt particles were predominant in that range on September 3–4, 2008. Sulfates and nitrates were predominant in the submicrometer range for these two periods. Water-dialysis analysis on May 6–7 indicated that 29% of the coarse particles were water insoluble, whereas 70% were water soluble or nearly soluble on September 3–4. The ratio of dry mass concentration to the backscattering coefficient (M/β p) was 34–39 g m−2 sr on May 7–8 and 6.2–6.3 g m−2 sr on September 3–4. Our results provide evidence that lidar-derived β p and δ p capture the aerosol mass concentration and relative abundance of the spherical and nonspherical particles although the microphysical properties vary significantly for individual particles.
Graphical abstract Display Omitted Highlights ► Collocated and simultaneous measurements of the aerosol were made using a lidar and aerosol sampler. ► The depolarization ratio was 14–18% when nonspherical mineral dust was present. ► The depolarization ratio was 6–7% when spherical sea salt droplets were present. ► The dry mass concentration-to-backscattering coefficient ratios were obtained.
Aerosol optical and microphysical properties as derived from collocated measurements using polarization lidar and direct sampling
Abstract Collocated and simultaneous measurements of aerosols near the ground were conducted using a lidar and aerosol sampler at Tsukuba, Japan, to clarify the relationship between lidar-derived optical properties and in-situ microphysical properties. The total linear particle depolarization ratio (δ p) ranged from 14% to 18% when nonspherical mineral dust particles were predominant in the supermicrometer range on May 7–8, 2008, whereas it ranged from 6% to 7% when spherical sea-salt particles were predominant in that range on September 3–4, 2008. Sulfates and nitrates were predominant in the submicrometer range for these two periods. Water-dialysis analysis on May 6–7 indicated that 29% of the coarse particles were water insoluble, whereas 70% were water soluble or nearly soluble on September 3–4. The ratio of dry mass concentration to the backscattering coefficient (M/β p) was 34–39 g m−2 sr on May 7–8 and 6.2–6.3 g m−2 sr on September 3–4. Our results provide evidence that lidar-derived β p and δ p capture the aerosol mass concentration and relative abundance of the spherical and nonspherical particles although the microphysical properties vary significantly for individual particles.
Graphical abstract Display Omitted Highlights ► Collocated and simultaneous measurements of the aerosol were made using a lidar and aerosol sampler. ► The depolarization ratio was 14–18% when nonspherical mineral dust was present. ► The depolarization ratio was 6–7% when spherical sea salt droplets were present. ► The dry mass concentration-to-backscattering coefficient ratios were obtained.
Aerosol optical and microphysical properties as derived from collocated measurements using polarization lidar and direct sampling
Sakai, Tetsu (author) / Nagai, Tomohiro (author) / Mano, Yuzo (author) / Zaizen, Yuji (author) / Inomata, Yayoi (author)
Atmospheric Environment ; 60 ; 419-427
2012-06-22
9 pages
Article (Journal)
Electronic Resource
English