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Statistical Comparison of Regional-Scale Tropospheric Aerosol Extinction Coefficient across China Based on CALIPSO Data

Category: Optical/Radiative Properties and Remote Sensing

Accepted Manuscripts
DOI: 10.4209/aaqr.2017.10.0385
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Yujun Qiu 1, Leiming Zhang2, Yongsheng Chen3

  • 1 School of Atmospheric Physics, Nanjing University of Information Science and Technology, Nanjing 210044, China
  • 2 Air Quality Research Division, Environment and Climate Change Canada, Toronto, ON M3H 5T4, Canada
  • 3 Department of Atmospheric Science, York University, Toronto, ON M3J 1P3, Canada

Highlights

Regional annual average EC varied by a factor of < 3.7 in the low troposphere.
Regional seasonal average EC varied by several ten-percent.
Light-polluted condition occurred by 5.5–42.1% in the low troposphere.
Heavy-polluted condition occurred by 1.3–9.8%.


Abstract

Two-year CALIPSO level 2 version 2 data were analyzed to obtain regional distributions of vertical profiles of aerosol extinction coefficient (AEC) across China. 10 typical geographical regions were selected for comparison, which cover various aerosol pollution levels, climate zones, and underlying surfaces. The whole troposphere was split into two-layers, Lower- and Upper-layer, separated by the maximum boundary layer height, representing the boundary layer and upper tropospheric layer, respectively. The annual average of the column-average AEC in the 10 regions ranged from 0.066 to 0.243 km–1 in the Lower-layer and from 0.022 to 0.059 km–1 in the Upper-layer. Regional AEC in the Lower-layer was the highest in central and eastern China followed by Sichuan Basin, Yunnan-Guizhou Plateau, the capital economic circle, Pearl River Delta, desert region, Tibet Plateau, northeast China, northwest semi-arid plateau, and the lowest in the East China Sea. Seasonal AEC in the Lower-layer was the highest in spring in desert and marine regions, summer in Tibet Plateau, and autumn or winter in the other regions. The regional and seasonal patterns of AEC in the Lower-layer agreed to a large extent with known regional distributions of surface-layer PM2.5 distributions and dominant seasonal emission sources in their respective regions. Regional and seasonal patterns in the Upper-layer were slightly different from those in the Lower-layer due to different transport pathways of aerosol pollution in different regions. Proportion of occurrence under different pollution conditions and the number of polluted days were also estimated based on AEC vertical profiles for each region for the Lower- and Upper-layer separately.

Keywords

Tropospheric aerosol Aerosol pollution Aerosol column average Occurrence frequency


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