Articles online

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
PDF | Supplemental material | RIS | BibTeX

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


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%.


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.


Tropospheric aerosol Aerosol pollution Aerosol column average Occurrence frequency

Related Article

Analysis of Aerosol Optical Properties due to a Haze Episode in the Himalayan Foothills: Implications for Climate Forcing

Khan Alam , Rehana Khan, Armin Sorooshian, Thomas Blaschke, Samina Bibi, Humera Bibi
Accepted Manuscripts
DOI: 10.4209/aaqr.2017.06.0222

Impact of Diwali Festival on Aerosol Optical Properties over an Urban City, Ahmedabad (India)

Nisha Vaghmaria, Niyati Mevada, James Maliakal
Volume: 18 | Issue: 2 | Pages: 522-532
DOI: 10.4209/aaqr.2017.04.0124

Effects of Carbon Dioxide Addition on the Soot Particle Sizes in an Ethylene/Air Flame

Linghong Chen, Jianwu Zhou, Xianjue Zheng, Jian Wu, Xuecheng Wu , Xiang Gao, Gérard Gréhan, Kefa Cen
Volume: 17 | Issue: 10 | Pages: 2522-2532
DOI: 10.4209/aaqr.2017.08.0271

Thirteen Years of Aerosol Radiative Forcing in Southwestern Iberian Peninsula

Maria A. Obregón , Maria J. Costa, Ana M. Silva, Antonio Serrano
Volume: 17 | Issue: 10 | Pages: 2509-2521
DOI: 10.4209/aaqr.2017.05.0159