Preprints
https://doi.org/10.5194/acp-2020-1278
https://doi.org/10.5194/acp-2020-1278

  19 Jan 2021

19 Jan 2021

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

Multi-dimensional satellite observations of aerosol properties and aerosol types over three major urban clusters in eastern China

Yuqin Liu1, Tao Lin1, Juan Hong4, Yonghong Wang3, Lamei Shi2, Yiyi Huang1,9, Xian Wu1, Hao Zhou1, Jiahua Zhang2, and Gerrit de Leeuw5,6,7,8 Yuqin Liu et al.
  • 1Key Lab of Urban Environment and Health, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China
  • 2Key Laboratory of Digital Earth Sciences, The Aerospace Information Research Institute, Chinese Academy of Sciences, Beijing 100094, China
  • 3Department of Physics, P.O. Box 64, 00014 University of Helsinki, Helsinki, Finland
  • 4Institute for Environmental and Climate Research, Jinan University, Guangzhou, Guangdong 511443, China
  • 5Royal Netherlands Meteorological Institute (KNMI), R&D Satellite Observations, 3730AE De Bilt, The Netherlands
  • 6Aerospace Information Research Institute, Chinese Academy of Sciences (AirCAS), No.20 Datun Road, Chaoyang District, Beijing 100101, China
  • 7Nanjing University of Information Science & Technology (NUIST), School of Atmospheric Physics, No.219, Ningliu Road, Nanjing, Jiangsu, China
  • 8University of Mining and Technology (CUMT), School of Environment Science and Spatial Informatics, Xuzhou, Jiangsu 221116, China
  • 9Coastal and Ocean Management Institute, Xiamen University, Xiamen 361102, China

Abstract. Using nine years (2007–2015) of data from passive (MODIS/Aqua) and active (CALIOP/CALIPSO) satellite measurements over China, we investigate (1) the temporal and spatial variation of aerosol properties over the Beijing-Tianjin-Hebei (BTH) region, the Yangtze River Delta (YRD) and the Pearl River Delta (PRD) and (2) the vertical distribution of aerosol types and extinction coefficients for different aerosol optical depth (AOD) and meteorological conditions. The results show the different spatial patterns and seasonal variations of the AOD over the three regions. Annual time series reveal the occurrence of AOD maxima in 2011 over the YRD and in 2012 over the BTH and PRD; thereafter the AOD decreases steadily. Using the CALIOP vertical feature mask, the contributions of different aerosol types to the AOD were analysed: contributions of dust and polluted dust decrease from north to south, contributions of clean ocean, polluted continental, clean continental and smoke aerosol increase from south to north. In the vertical, the peak frequency of occurrence (FO) for each aerosol type depends on region and season and varies with AOD and meteorological conditions. In general, three distinct layers are observed with the peak FO at the surface (clean continental and clean marine aerosol), at ~1 km (polluted dust and polluted continental aerosol) and at ~3 km (smoke aerosol), whereas dust aerosol may occur all over the altitude range considered in this study (from the surface up to 8 km). In this study nighttime CALIOP profiles were used. The comparison with daytime profiles shows substantial differences in the FO profiles with altitude which suggest effects of boundary layer dynamics and aerosol transport on the vertical distribution of aerosol types.

Yuqin Liu et al.

Status: open (until 16 Mar 2021)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Review of Liu et al. - Multi-dimensional satellite observations of aerosol properties and aerosol types over three major urban clusters in eastern China', Anonymous Referee #2, 12 Feb 2021 reply
  • RC2: 'Comments on “Multi-dimensional satellite observations of aerosol properties and aerosol types over three major urban clusters in eastern China” by Yuqin Liu et al.', Anonymous Referee #1, 20 Feb 2021 reply

Yuqin Liu et al.

Yuqin Liu et al.

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Short summary
The 4-dimensional variation of aerosol properties over the BTH, YRD and PRD (east China) were investigated using satellite observations from 2007 to 2015. Distinct differences between the aerosol optical depth and the vertical distribution of the occurrence of aerosol types over these regions depend on season, aerosol loading and meteorological conditions. Day/night differences between the vertical distribution of aerosol types suggest effects of boundary layer dynamics and aerosol transport.
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