Impacts of biomass-burning on aerosol properties of a severe haze event over Shanghai--颗粒学报PARTICUOLOGY

He, Q., Zhao, X., Lu, J., Zhou, G., Yang, H., Gao, W., Yu, W., & Cheng, T. (2015). Impacts of biomass-burning on aerosol properties of a severe haze event over Shanghai. Particuology, 20, 52–60. https://doi.org/10.1016/j.partic.2014.11.004

Impacts of biomass-burning on aerosol properties of a severe haze event over Shanghai

Qianshan He ^a, Xiaoyan Zhao ^b, Jing Lu ^{b c}, Guangqiang Zhou ^{a d *}, Hequn Yang ^a, Wei Gao ^a, Wei Yu ^a, Tiantao Cheng ^e

a Shanghai Meteorological Service, 166 Puxi Road, Shanghai 200030, China
b Yale-NUIST Center on Atmospheric Environment, Nanjing University of Information Science & Technology, 216 Ningliu Road, Nanjing 210044, China
c Computer Science Department, Oklahoma State University, Stillwater, OK 74078, USA
d Shanghai Key Laboratory of Meteorology and Health (Shanghai Meteorology Service), 951 Jinxiu Road, Shanghai 200135, China
e Department of Environmental Science & Engineering, Fudan University, 220 Handan Road, Shanghai 200433, China

10.1016/j.partic.2014.11.004

Volume 20, June 2015, Pages 52-60

Received 2 May 2014, Revised 13 November 2014, Accepted 24 November 2014, Available online 2 February 2015.

E-mail: zhougq21@163.com

Highlights

• A typical biomass-burning plume and urban/industrial emission were observed over Shanghai.

• Remote sensing and sample measurements were used to assess impact of biomass-burning.

• Optical characteristics of biomass-burning plume differed from those of other local emissions.

• Fine particles in atmosphere increased significantly under the influence of biomass-burning.

Abstract

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-burning 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 (α) 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 α 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-fine/PM-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.

Graphical abstract

Keywords

Air pollution; Biomass-burning aerosol; Sun photometer; Optical property

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