Preprints
https://doi.org/10.5194/amt-2021-365
https://doi.org/10.5194/amt-2021-365

  20 Nov 2021

20 Nov 2021

Review status: this preprint is currently under review for the journal AMT.

A new multispectral photometer for monitoring aerosol microphysical, optical, and radiative properties

Yu Zheng1, Huizheng Che1, Yupeng Wang2, Xiangao Xia3, Xiuqing Hu4, Xiaochun Zhang5, Jun Zhu6, Jibiao Zhu1, Hujia Zhao7, Lei Li1, Ke Gui1, and Xiaoye Zhang1 Yu Zheng et al.
  • 1State Key Laboratory of Severe Weather & Key Laboratory of Atmospheric Chemistry of CMA, Chinese Academy of Meteorological Sciences, China Meteorological Administration, Beijing, 100081, China
  • 2Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun, 130033, China
  • 3LAGEO, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing, 100029, China
  • 4National Satellite Meteorological Center, China Meteorological Administration, Beijing, 100081, China
  • 5Centre for Atmosphere Watch and Services, Meteorological Observation Centre, China Meteorological Administration, Beijing, 100081, China
  • 6Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution Control, Collaborative Innovation Center of Atmospheric Environment and Equipment Technology, School of Environmental Science and Engineering, Nanjing University of Information Science & Technology, Nanjing, 210044, China
  • 7Institute of Atmospheric Environment, China Meteorological Administration, Shenyang 110166, China

Abstract. A new multispectral photometer, named CW193, was proposed in this study for monitoring aerosol microphysical, optical, and radiative properties. The instrument has a highly integrated design, smart control performance, and is composed of three parts (an optical head, a robotic drive platform, and a stents system). Because of its low maintenance requirements, this instrument is appropriate for the deployment in remote and unpopulated regions. Based on the synchronous measurements, the CW193 products was validated using reference data from the AERONET CE318 photometer. The results show that the raw digital counts from CW193 agree well the counts from AERONET (R2 > 0.97), with daily average triplets of around 1.2 % to 3.0 % for the ultraviolet band and less than 2.0 % for the visible and infrared bands. A good aerosol optical depth agreement (R > 0.99, 100 % within expected error) and root mean square error (RMSE) values ranging from 0.006 (for the 870 nm band) to 0.016 (for 440 nm the band) are obtained, with a relative mean bias (RMB) ranging from 0.922 to 1.112 and an aerosol optical depth bias within ±0.04. The maximum deviations for fine-mode particles varied from about 8.9 % to 77.6 %, whereas the variation for coarse-mode particles was about 13.1 % to 29.1 %. The deviation variations of the single scattering albedo were approximately 0.1–1.8 %, 0.6–1.9 %, 0.1–2.6 %, and 0.8–3.5 % for the 440 nm, 675 nm, 870 nm, and 1020 nm bands, respectively. For the aerosol direct radiative forcing, deviations of approximately 4.8–12.3 % was obtained at the Earth’s surface and 5.4–15.9 % for the top of the atmosphere. In addition, the water vapor retrievals showed a satisfactory accuracy, characterized by a high R value (~0.997), a small RMSE (~0.020), and good expected error distribution (100 % within expected error). The water vapor RMB was about 0.979 and the biases mostly varied within ±0.04, whereas the mean values were concentrated within ±0.02.

Yu Zheng et al.

Status: open (until 25 Dec 2021)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on amt-2021-365', Anonymous Referee #1, 26 Nov 2021 reply
  • RC2: 'Comment on amt-2021-365', Anonymous Referee #2, 08 Dec 2021 reply

Yu Zheng et al.

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Short summary
Aerosol ground-based observation is of great significance for satellite and climate model modification. Here, we present a new multispectral photometer, named CW193, for monitoring aerosol microphysical, optical, and radiative properties, which is highly integrated design and smart control performance. The validation of its products is discussed in detail based on the intercomparsion with sun photometer. This device will contribute to filling the observation gaps in remote areas over China.