气候变化领域集成服务门户(CCPortal): In situ optical and microphysical properties of tropospheric aerosols in the Canadian High Arctic from 2016 to 2019

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DOI	10.1016/j.atmosenv.2021.118254
	In situ optical and microphysical properties of tropospheric aerosols in the Canadian High Arctic from 2016 to 2019
	Vicente-Luis A.; Tremblay S.; Dionne J.; Chang R.Y.-W.; Fogal P.F.; Leaitch W.R.; Sharma S.; Kolonjari F.; Hayes P.L.
发表日期	2021
ISSN	1352-2310
卷号	250
英文摘要	Since aerosols are an integral part of the Arctic climate system, understanding aerosol radiative properties and the relation of these properties to each other is important for constraining aerosol radiative forcing effects in this remote region where measurements are sparse. In situ measurements of aerosol size distribution, aerosol light scattering and absorption were taken near Eureka (80.05oN, 86.42oW), on Ellesmere Island, in the Canadian High Arctic over three consecutive years to provide insights into radiative properties of Arctic aerosols. During periods of Arctic haze, we find that the single scattering albedo (SSA) at 405 nm is generally higher and more stable than that determined at 870 nm, with values ranging between 0.90–0.99 and 0.79–0.97, respectively. Events with elevated absorption coefficients (Babs) exhibit generally an absorption Ångström exponent (AAE) of around 1 suggesting that black carbon (BC) is the dominant absorbing aerosol for the measurement period. AAE values close to 2 occurring with scattering Ångström exponent (SAE) values near 0 and SAE values below 0 occasionally observed in December indicate a potential contribution from mineral dust aerosols in late fall and early winter. The apparent real and imaginary parts of the complex refractive index at 405 nm have been found to range between 1.6–1.9 and 0.002–0.02, respectively. The low imaginary component indicates very weak intrinsic absorption compared to BC-rich aerosols. Systematic variabilities between different aerosol optical and microphysical properties depend strongly on the given wavelength. SSA at 405 nm shows a strong inverse dependence with Babs, because Babs correlates positively with the imaginary component of the refractive index. On the other hand, SSA at 870 nm correlates with scattering coefficient (Bsca) and not with Babs due to a greater sensitivity to the ambient particle size distribution for 870 nm scattering. Smaller particles with higher SAE that are prevalent during less polluted periods only weakly scatter at 870 nm leading to lower SSA when Bsca is also low. Lastly, FLEXPART back-trajectories show that lower aerosol SSA and higher Babs correspond to air masses which are more influenced by Eurasian and Alaskan regions, including regions known to have important BC emissions. This work emphasizes the important variability in Arctic aerosol optical properties during winter and spring, which is likely due to changes in source regions. © 2021 Elsevier Ltd
关键词	Aerosol optical properties Arctic haze Black carbon Canadian High Arctic Particle size distributions Photoacoustic extinctiometer (PAX)
语种	英语
scopus关键词	Atmospheric radiation; Light scattering; Particle size; Particle size analysis; Refractive index; Size distribution; Absorption co-efficient; Aerosol radiative forcing; Aerosol size distributions; Complex refractive index; Light scattering and absorptions; Microphysical property; Scattering co-efficient; Single scattering albedo; Aerosols; black carbon; sodium chloride; absorption; atmospheric pollution; black carbon; light scattering; mineral dust; optical property; particle size; radiative forcing; refractive index; scattering; size distribution; absorption; aerosol; altitude; Arctic; Article; atmospheric transport; Canada; climate; cold climate; comparative study; dry climate; light absorption; light scattering; mineral dust; optics; physical parameters; priority journal; refraction index; spring; troposphere; winter; Canada; Ellesmere Island; Eureka; Nunavut; Queen Elizabeth Islands
来源期刊	ATMOSPHERIC ENVIRONMENT
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/248542
作者单位	Department of Chemistry, Université de Montréal, Montréal, Québec H3T 1J4, Canada; Department of Physics and Atmospheric Science, Dalhousie University, Halifax, NS B3H 4R2, Canada; Department of Physics, University of Toronto, Toronto, ON M5S 1A7, Canada; Climate Research Division, Environment and Climate Change Canada, Toronto, ON M3H 5T4, Canada; Watershed Hydrology and Ecology Research Division, Environment and Climate Change Canada, Victoria, BC V8N 1V8, Canada
推荐引用方式 GB/T 7714	Vicente-Luis A.,Tremblay S.,Dionne J.,et al. In situ optical and microphysical properties of tropospheric aerosols in the Canadian High Arctic from 2016 to 2019[J],2021,250.
APA	Vicente-Luis A..,Tremblay S..,Dionne J..,Chang R.Y.-W..,Fogal P.F..,...&Hayes P.L..(2021).In situ optical and microphysical properties of tropospheric aerosols in the Canadian High Arctic from 2016 to 2019.ATMOSPHERIC ENVIRONMENT,250.
MLA	Vicente-Luis A.,et al."In situ optical and microphysical properties of tropospheric aerosols in the Canadian High Arctic from 2016 to 2019".ATMOSPHERIC ENVIRONMENT 250(2021).