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- Title
Spatial distribution of aerosol microphysical and optical properties and direct radiative effect from the China Aerosol Remote Sensing Network.
- Authors
Huizheng Che; Xiangao Xia; Hujia Zhao; Dubovik, Oleg; Holben, Brent N.; Goloub, Philippe; Cuevas-Agulló, Emilio; Estelles, Victor; Yaqiang Wang; Jun Zhu; Bing Qi; Wei Gong; Honglong Yang; Renjian Zhang; Leiku Yang; Jing Chen; Hong Wang; Yu Zheng; Ke Gui; Xiaochun Zhang
- Abstract
Long-term observations of aerosol microphysical and optical properties obtained through ground-based remote sensing at 50 China Aerosol Remote Sensing Network (CARSNET) sites were used to characterize the aerosol climatology for representative remote, rural, and urban areas over China to assess effects on climate. The annual mean effective radii for total particles (Refft) decreased from north to south and from rural to urban sites, and high total particle volumes were found at the urban sites. The aerosol optical depth at 440nm (AOD440nm) increased from remote/rural sites (0.12) to urban sites (0.79), and the extinction Ångström exponent (EAE440-870nm) increased from 0.71 at the arid/semi-arid sites to 1.15 at the urban sites, presumably due to anthropogenic emissions. Single scattering albedos (SSA440nm) ranged from 0.88 to 0.92 indicating slightly to strongly absorbing aerosols. Absorption AOD440nm's were 0.01 at the remote sites versus 0.07 at the urban sites. The average direct aerosol radiative effect (DARE) at the bottom of atmosphere increased from the sites in the remote (-24.40W/m2) to the urban area (-103.28W/m2) indicating increased cooling at the latter. The DARE for the top of the atmosphere increased from -4.79W/m2 at the remote sites to -30.05W/m2 at the urban sites, indicating overall cooling effects for the earth-atmosphere system. A classification method based on SSA440nm, fine mode fraction (FMF), and EAE440-870nm showed that coarse mode particles (mainly dust) were dominant at the rural sites near the northwestern deserts, while light-absorbing, fine-mode particles were important at most urban sites. This study will be useful for understanding aerosol climate effects and regional environmental pollution, and the results will provide useful information for satellite validation and the improvement of climate modelings.
- Subjects
CHINA; REMOTE sensing; OPTICAL properties; AEROSOLS; POLLUTION; DUST; OPTICAL depth (Astrophysics); CARBONACEOUS aerosols
- Publication
Atmospheric Chemistry & Physics Discussions, 2019, p1
- ISSN
1680-7367
- Publication type
Article
- DOI
10.5194/acp-2019-405