Anthropogenic aerosols have significant impacts on the environment and human health in the Yangtze River Delta region, one of the most densely populated regions in the world. A biomass-buming plume swept across this a...Anthropogenic aerosols have significant impacts on the environment and human health in the Yangtze River Delta region, one of the most densely populated regions in the world. A biomass-buming plume swept across this area （Shanghai） in May 2009, leading to changes in the physical and optical properties of aerosols, which were investigated using ground-based remote sensing and in situ measurements via comparisons with dust pollution and background conditions. Experiments show that the biomass-burning plume led to an increase in the average aerosol optical depth （AOD） at 500 nm from 0.73 to 1.00 （37% higher）, an absorption Angstrom exponent （AAE） of 1.48, and an increase in the Angstrom exponent （ce） up to 1.53. Furthermore, local dust aerosols derived from road dust and]or construction dust also led to higher values of AOD （2.68） and AAE （2.16）, and a daily average value of a of 1.05. For the biomass-burning plume, the aerosol particles exhibited significant variations in short-wavelength spectra. The single scattering albedo at 670 nm decreased remarkably under the influence of the biomass-burning plume, indicating the significant absorptive ability of the biomass-burning pollution and higher ratio of absorption aerosols within the plume. Under the effects of the biomass-burning, the volume concentration of fine-mode aerosols increased significantly and the PM-fineIPM-coarse volume concentration ratio reached 12.33. This relatively large change in fine-mode particles indicates that biomass-burning has a greater impact on fine-mode aerosols than on coarse-mode aerosols.展开更多
基金supported by research grants from the National Natural Science Foundation of China (NSFC,Grant numbers:40705013 and 41005007)China Special Fund for Meteorological Research in the Public Interest(Grant no.GYHY201106023)+1 种基金Shanghai Science and Technology Committee Research Special Funds(Grant nos.10JC1401600 and 12dz1202702)Shanghai Meteorological Service Project(Grant no.QM201204)
文摘Anthropogenic aerosols have significant impacts on the environment and human health in the Yangtze River Delta region, one of the most densely populated regions in the world. A biomass-buming plume swept across this area （Shanghai） in May 2009, leading to changes in the physical and optical properties of aerosols, which were investigated using ground-based remote sensing and in situ measurements via comparisons with dust pollution and background conditions. Experiments show that the biomass-burning plume led to an increase in the average aerosol optical depth （AOD） at 500 nm from 0.73 to 1.00 （37% higher）, an absorption Angstrom exponent （AAE） of 1.48, and an increase in the Angstrom exponent （ce） up to 1.53. Furthermore, local dust aerosols derived from road dust and]or construction dust also led to higher values of AOD （2.68） and AAE （2.16）, and a daily average value of a of 1.05. For the biomass-burning plume, the aerosol particles exhibited significant variations in short-wavelength spectra. The single scattering albedo at 670 nm decreased remarkably under the influence of the biomass-burning plume, indicating the significant absorptive ability of the biomass-burning pollution and higher ratio of absorption aerosols within the plume. Under the effects of the biomass-burning, the volume concentration of fine-mode aerosols increased significantly and the PM-fineIPM-coarse volume concentration ratio reached 12.33. This relatively large change in fine-mode particles indicates that biomass-burning has a greater impact on fine-mode aerosols than on coarse-mode aerosols.
