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Atmospheric Measurement Techniques An interactive open-access journal of the European Geosciences Union
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Discussion papers
https://doi.org/10.5194/amt-2019-15
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/amt-2019-15
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.

Research article 06 Feb 2019

Research article | 06 Feb 2019

Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Atmospheric Measurement Techniques (AMT).

A new method to determine the aerosol optical properties from multiple wavelength O4 absorptions by MAX-DOAS observation

Chengzhi Xing1, Cheng Liu1,2,3,7, Shanshan Wang4,5, Qihou Hu3, Haoran Liu1, Wei Tan3, Wenqiang Zhang3,6, Bo Li1, and Jianguo Liu2,3 Chengzhi Xing et al.
  • 1School of Earth and Space Sciences, University of Science and Technology of China, Hefei, 230026, China
  • 2Center for Excellence in Regional Atmospheric Environment, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen, 361021, China
  • 3Key Lab of Environmental Optics & Technology, Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei, 230031, China
  • 4Shanghai Key Laboratory of Atmospheric Particle Pollution and Prevention (LAP3), Department of Environmental Science and Engineering, Fudan University, Shanghai, 200433, China
  • 5Shanghai Institute of Eco-Chongming (SIEC), No.3663 Northern Zhongshan Road, Shanghai, 200062, China
  • 6School of Environmental Science and Optoelectronic Technology, University of Science and Technology of China, Hefei, 230026, China
  • 7Anhui Province Key Laboratory of Polar Environment and Global Change, USTC, Hefei, 230026, China

Abstract. Ground based Multi-AXis Differential Optical Absorption Spectroscopy (MAX-DOAS) observation was carried out from November 2016 to February 2017 in Beijing, China to measure the O4 absorptions in UV and visible bands and further to illustrate its relationship with aerosol optical properties (AOPs) under different the weather types. According to relative humidity, visibility and PM2.5, we classified the observation periods into clear, non-haze, haze, heavy-haze, fog and rainy five different weather conditions. There are obvious differences for measured AOPs under different weather conditions, especially scattering coefficient (σsca) and absorption coefficient (σabs). It was also found that both the O4 Differential Slant Column Densities (DSCDs) at UV and visible bands varied in the order of clear days > non-haze days > haze days > heavy-haze days > fog days. The correlation coefficients (R2) between O4 DSCDs at 360.8 and 477.1 nm mainly varied in the order of clear days > non-haze days > haze days > heavy-haze days. Based on the statistics of O4 DSCDs at elevation angle 1o with the corresponding linear regression between UV and visible bands of segmental periods, the relationships between O4 DSCDs and AOPs were established. It mainly should be clear or non-haze days when the correlation slope is greater than 1.0, correlation coefficient (R2) greater than 0.9 and O4 DSCDs mainly greater than 2.5 × 1043 molec cm−2. Meanwhile, σsca and σabs are less than 45 and 12 Mm−1, respectively. For haze or heavy-haze days, the correlation slope is less than 0.6, R2 less than 0.8 and O4 DSCDs mainly less than 1.3 × 1043 molec cm−2, under which σsca and σabs are mainly located at 200–900 and 20–60 Mm−1. Additionally, the determination method was well validated based on another MAX-DOAS measurement at Gucheng from 19 to 27 November 2016. For more precise and accurate inversion of AOPs, more detailed look-up tables for O4 multiple wavelength absorptions need to developed. Furthermore, the vertical spatial-resolved aerosol scattering and absorption information is worthy of being expected by using DSCDs at different elevation angles.

Chengzhi Xing et al.
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Short summary
Ground based MAX-DOAS has been utilized for the remote sensing of aerosol and trace gases more than ten years. Here we developed a new method to determine the aerosol optical properties, including scattering and absorption, etc., from multiple wavelength O4 absorptions by ground-based MAX-DOAS observation, which were validated well by other independent instruments at low elevations. It is worthy of being expected to obtain the vertical profiles of aerosol properties using multiple elevations.
Ground based MAX-DOAS has been utilized for the remote sensing of aerosol and trace gases more...
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