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© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.

Submitted as: research article 28 May 2019

Submitted as: research article | 28 May 2019

Review status
This discussion paper is a preprint. A revision of the manuscript is under review for the journal Atmospheric Chemistry and Physics (ACP).

Spatial distribution of aerosol microphysical and optical properties and direct radiative effect from the China Aerosol Remote Sensing Network

Huizheng Che1, Xiangao Xia2,3, Hujia Zhao1,4, Oleg Dubovik5, Brent N. Holben6, Philippe Goloub5, Emilio Cuevas-Agulló7, Victor Estelles8, Yaqiang Wang1, Jun Zhu9, Bing Qi10, Wei Gong11, Honglong Yang12, Renjian Zhang13, Leiku Yang14, Jing Chen15, Hong Wang1, Yu Zheng1, Ke Gui1,2, Xiaochun Zhang16, and Xiaoye Zhang1 Huizheng Che et al.
  • 1State Key Laboratory of Severe Weather (LASW) and Key Laboratory of Atmospheric Chemistry (LAC), Chinese Academy of Meteorological Sciences, CMA, Beijing, 100081, China
  • 2Laboratory for Middle Atmosphere and Global Environment Observation (LAGEO), Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing, 100029, China
  • 3University of Chinese Academy of Science, Beijing, 100049, China
  • 4Institute of Atmospheric Environment, CMA, Shenyang, 110016, China
  • 5Laboratoire d’Optique Amosphérique, Université des Sciences et Technologies de Lille, 59655, Villeneuve d’Ascq, France
  • 6NASA Goddard Space Flight Center, Greenbelt, MD, USA
  • 7Centro de Investigación Atmosférica de Izaña, AEMET, 38001 Santa Cruz de Tenerife, Spain
  • 8Dept. Fisica de la Terra i Termodinamica, Universitat de Valencia, C/ Dr. Moliner 50, 46100 Burjassot, Spain
  • 9Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters, Nanjing University of Information Science & Technology, Nanjing, 210044, China
  • 10Hangzhou Meteorological Bureau, Hangzhou, 310051, China
  • 11State Key Laboratory of Information Engineering in Surveying, Mapping and Remote Sensing, Wuhan University, Wuhan, 430079, China
  • 12Shenzhen Meteorological Bureau, Shenzhen, 518040, China
  • 13Key Laboratory of Regional Climate-Environment Research for Temperate East Asia, Institute of Atmospheric Physics, Beijing, 100029, Chinese Academy of Sciences
  • 14School of Surveying and Land Information Engineering, Henan Polytechnic University, Jiaozuo, 454000, China
  • 15Shijiazhuang Meteorological Bureau, Shijiazhuang, 050081, China
  • 16Meteorological Observation Center, CMA, Beijing, 100081

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 440 nm (AOD440 nm) increased from remote/rural sites (0.12) to urban sites (0.79), and the extinction Ångström exponent (EAE440–870 nm) 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 (SSA440 nm) ranged from 0.88 to 0.92 indicating slightly to strongly absorbing aerosols. Absorption AOD440 nm'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 (−24.40 W/m2) to the urban area (−103.28 W/m2) indicating increased cooling at the latter. The DARE for the top of the atmosphere increased from −4.79 W/m2 at the remote sites to −30.05 W/m2 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 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.

Huizheng Che et al.
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Status: final response (author comments only)
Status: final response (author comments only)
AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment
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Huizheng Che et al.
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Short summary
A full-scale description of the ground-based aerosol microphysical and optical properties over China is presented. Moreover, the results also have provided significant information on aerosol optical and radiative properties for different types of sites covering a broad expanse of China. The results have considerable value for ground truthing satellite observations and for validating aerosol models.
A full-scale description of the ground-based aerosol microphysical and optical properties over...