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Aerosol optical properties and direct radiative forcing based on measurements from the China Aerosol Remote Sensing Network (CARSNET) in eastern China

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Aerosol optical properties and direct radiative forcing based on measurements from the China Aerosol Remote Sensing Network (CARSNET) in eastern China

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dc.contributor.author	Che, Huizheng
dc.contributor.author	Qi, Bing
dc.contributor.author	Zhao, Hujia
dc.contributor.author	Xia, Xiangao
dc.contributor.author	Eck, Thomas F.
dc.contributor.author	Goloub, Philippe
dc.contributor.author	Dubovik, Oleg
dc.contributor.author	Estellés Leal, Víctor
dc.contributor.author	Cuevas-Agulló, Emilio
dc.contributor.author	Blarel, Luc
dc.contributor.author	Wu, Yunfei
dc.contributor.author	Zhu, Jun
dc.contributor.author	Du, Rongguang
dc.contributor.author	Wang, Yaqiang
dc.contributor.author	Wang, Hong
dc.contributor.author	Gui, Ke
dc.contributor.author	Yu, Jie
dc.contributor.author	Zheng, Yu
dc.contributor.author	Sun, Tianze
dc.contributor.author	Chen, Quanliang
dc.contributor.author	Shi, Guangyu
dc.contributor.author	Zhang, Xiaoye
dc.date.accessioned	2019-04-10T16:19:18Z
dc.date.available	2019-04-10T16:19:18Z
dc.date.issued	2018
dc.identifier.citation	Che, Huizheng Qi, Bing Zhao, Hujia Xia, Xiangao Eck, Thomas F. Goloub, Philippe Dubovik, Oleg Estellés Leal, Víctor Cuevas-Agulló, Emilio Blarel, Luc Wu, Yunfei Zhu, Jun Du, Rongguang Wang, Yaqiang Wang, Hong Gui, Ke Yu, Jie Zheng, Yu Sun, Tianze Chen, Quanliang Shi, Guangyu Zhang, Xiaoye 2018 Aerosol optical properties and direct radiative forcing based on measurements from the China Aerosol Remote Sensing Network (CARSNET) in eastern China Atmospheric Chemistry and Physics 18 405 425
dc.identifier.uri	http://hdl.handle.net/10550/69840
dc.description.abstract	Aerosol pollution in eastern China is an unfortunate consequence of the region's rapid economic and industrial growth. Here, sun photometer measurements from seven sites in the Yangtze River Delta (YRD) from 2011 to 2015 were used to characterize the climatology of aerosol microphysical and optical properties, calculate direct aerosol radiative forcing (DARF) and classify the aerosols based on size and absorption. Bimodal size distributions were found throughout the year, but larger volumes and effective radii of fine-mode particles occurred in June and September due to hygroscopic growth and/or cloud processing. Increases in the fine-mode particles in June and September caused AOD440 nm > 1.00 at most sites, and annual mean AOD440 nm values of 0.71-0.76 were found at the urban sites and 0.68 at the rural site. Unlike northern China, the AOD440 nm was lower in July and August (∼ 0.40-0.60) than in January and February (0.71-0.89) due to particle dispersion associated with subtropical anticyclones in summer. Low volumes and large bandwidths of both fine-mode and coarse-mode aerosol size distributions occurred in July and August because of biomass burning. Single-scattering albedos at 440 nm (SSA440 nm) from 0.91 to 0.94 indicated particles with relatively strong to moderate absorption. Strongly absorbing particles from biomass burning with a significant SSA wavelength dependence were found in July and August at most sites, while coarse particles in March to May were mineral dust. Absorbing aerosols were distributed more or less homogeneously throughout the region with absorption aerosol optical depths at 440 nm ∼ 0.04-0.06, but inter-site differences in the absorption Angström exponent indicate a degree of spatial heterogeneity in particle composition. The annual mean DARF was −93 ± 44 to −79 ± 39 W m−2 at the Earth's surface and ∼ −40 W m−2 at the top of the atmosphere (for the solar zenith angle range of 50 to 80∘) under cloud-free conditions. The fine mode composed a major contribution of the absorbing particles in the classification scheme based on SSA, fine-mode fraction and extinction Angström exponent. This study contributes to our understanding of aerosols and regional climate/air quality, and the results will be useful for validating satellite retrievals and for improving climate models and remote sensing algorithms.
dc.language.iso	eng
dc.relation.ispartof	Atmospheric Chemistry and Physics, 2018, num. 18, p. 405-425
dc.subject	Aerosols
dc.subject	Termodinàmica atmosfèrica
dc.title	Aerosol optical properties and direct radiative forcing based on measurements from the China Aerosol Remote Sensing Network (CARSNET) in eastern China
dc.type	journal article	es_ES
dc.date.updated	2019-04-10T16:19:18Z
dc.identifier.doi	10.5194/acp-18-405-2018
dc.identifier.idgrec	126882
dc.rights.accessRights	open access	es_ES