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Aerosol Optical Properties over an Urban Site in Central China Determined Using Ground-Based Sun Photometer Measurements

Category: Optical/Radiative Properties and Remote Sensing

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DOI: 10.4209/aaqr.2018.05.0185
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Chao Liu1,2, Leiku Yang1, Huizheng Che 2, Xiangao Xia3,4, Hujia Zhao2,5, Hong Wang2, Ke Gui2, Yu Zheng2,6, Tianze Sun2, Xiaopan Li2, Zhizhong Sheng2, Han Wang1, Xiaofeng Lu1, Xiaoye Zhang2

  • 1 School of Surveying and Land Information Engineering, Henan Polytechnic University, Henan 454000, China
  • 2 State Key Laboratory of Severe Weather (LASW), Institute of Atmospheric Composition, Chinese Academy of Meteorological Sciences, Beijing 100081, China
  • 3 Laboratory for Middle Atmosphere and Global Environment Observation (LAGEO), Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, China
  • 4 School of Geoscience University of Chinese Academy of Science, Beijing 100049, China
  • 5 Institute of Atmospheric Environment, China Meteorological Administration, Shenyang 110016, China
  • 6 Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters, Nanjing University of Information Science and Technology, Nanjing 210044, China

Highlights

We show climatological variation of aerosol optical properties over Jiaozuo firstly.
Aerosol classification indicates absorbing aerosol is the dominant type in Jiaozuo.
This site is impacted by long-range transportation of anthropogenic and dust aerosols.


Abstract

Sun photometer measurements at urban Jiaozuo in Central China from July 2016 to February 2018 were used to investigate the aerosol optical and microphysical properties, including the climatological variation of aerosol properties, aerosol classification and properties under haze and dust events. The annual mean aerosol optical depth at 440 nm (AOD440 nm) and the Ångström exponent (AE440-870 nm) were 0.84 ± 0.55 and 1.12 ± 0.17, respectively. The highest AOD being in summer may be associated with the hygroscopic growth of aerosols under enhanced relative humidity. Accordingly, high volume of fine-mode particles was observed in summer. In addition, the carbonaceous aerosols from biomass burning increased the volume of fine particles in June and September. Whereas the coarse-mode particles (mainly dust) dominated during spring, especially in May with a maximum volume of 0.16 µm3 µm–2. The seasonal mean single scattering albedo at 440 nm (SSA440 nm) was lower in spring (0.87 ± 0.05) and higher in summer (0.95 ± 0.04). On the contrary, absorption aerosol optical depth at 440 nm (AAOD440 nm) was higher during spring (0.079 ± 0.019) and lower during summer (0.045 ± 0.021). The increased absorptivity of aerosols in spring and strong scattering ability in summer may be associated with aerosol particles from different sources. The predominant aerosol type was absorbing aerosols (fine and mixed) according to the classification technique using fine mode fraction (FMF), SSA and AE. This urban site was not only influenced by anthropogenic aerosols from local emissions and the surrounding regions but also affected by dust from northwestern China. The mean AOD and AE were 1.66 and 1.38 on haze days, while slightly low AOD of 0.95 and extremely low AE of 0.18 on dust days. This study provides a comprehensive understanding of aerosol properties in this area, and the results will help to optimize the satellite aerosol inversion algorithm and promote regional climate change research.

Keywords

Aerosol optical properties Aerosol classification Sun photometer measurements Jiaozuo


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