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Spatial distribution of aerosol microphysical and optical properties and direct radiative effect from the China Aerosol Remote Sensing Network
Title: Spatial distribution of aerosol microphysical and optical properties and direct radiative effect from the China Aerosol Remote Sensing Network
Authors: Che, HuizhengXia, XiangaoZhao, HujiaDubovik, OlegHolben, Brent N.Goloub, PhilippeCuevas Agulló, Emilio ORCID RESEARCHERID SCOPUSID Autor AEMETEstellés Leal, VíctorWang, YaqiangZhu, JunQi, BingGong, WeiYang, HonglongZhang, RenjianYang, LeikuChen, JingWang, HongZheng, YuGui, KeZhang, XiaochunZhang, Xiaoye
Keywords: Aerosol properties; Radiative effect; Remote sensing; Sunphotometers; Spatial distribution
Issue Date: 2019
Publisher: European Geosciences Union
Citation: Atmospheric Chemistry and Physics. 2019, 19(18), p. 11843–11864
Publisher version:
Abstract: Multi-year 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 440 nm (AOD440 nm) increased from remote and rural sites (0.12) to urban sites (0.79), and the extinction Ångström exponent (EAE440–870 nm) increased from 0.71 at the arid and semi-arid sites to 1.15 at the urban sites, presumably due to anthropogenic emissions. Single-scattering albedo (SSA440 nm) ranged from 0.88 to 0.92, indicating slightly to strongly absorbing aerosols. Absorption AOD440 nm values 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 areas (−24.40 W m−2) to the urban areas (−103.28 W m−2), indicating increased cooling at the latter. The DARE for the top of the atmosphere increased from −4.79 W m−2 at the remote sites to −30.05 W m−2 at the urban sites, indicating overall cooling effects for the Earth–atmosphere system. A classification method based on SSA440 nm, fine-mode fraction (FMF), and EAE440–870 nm 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 important for understanding aerosol climate effects and regional environmental pollution, and the results will provide useful information for satellite validation and the improvement of climate modelling.
Sponsorship : This work was supported by grants from the National Science Fund for Distinguished Young Scholars (41825011), the National Key R & D Program Pilot Projects of China (2016YFA0601901), National Natural Science Foundation of China (41590874), the CAMS Basis Research Project (2017Z011), the European Union Seventh Framework Programme (FP7/2007-2013) under grant agreement no. 262254. AERONET-Europe ACTRIS-2 program, European Union’s Horizon 2020 research and innovation programme under grant agreement No 654109.
ISSN: 1680-7316
Appears in Collections:Artículos científicos 2019-2022

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