气候变化领域集成服务门户(CCPortal): From a polar to a marine environment: Has the changing Arctic led to a shift in aerosol light scattering properties?

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DOI	10.5194/acp-20-13671-2020
	From a polar to a marine environment: Has the changing Arctic led to a shift in aerosol light scattering properties?
	Heslin-Rees D.; Burgos M.; Hansson H.C.; Krejci R.; Ström J.; Tunved P.; Zieger P.
发表日期	2020
ISSN	1680-7316
起始页码	13671
结束页码	13686
卷号	20 期号:21
英文摘要	The study of long-term trends in aerosol optical properties is an important task to understand the underlying aerosol processes influencing the change of climate. The Arctic, as the place where climate change manifests most, is an especially sensitive region of the world. Within this work, we use a unique long-term data record of key aerosol optical properties from the Zeppelin Observatory, Svalbard, to ask the question of whether the environmental changes of the last 2 decades in the Arctic are reflected in the observations. We perform a trend analysis of the measured particle light scattering and backscattering coefficients and the derived scattering Ångstrom exponent and hemispheric backscattering fraction. In contrast to previous studies, the effect of in-cloud scavenging and of potential sampling losses at the site are taken explicitly into account in the trend analysis. The analysis is combined with a back trajectory analysis and satellite-derived sea ice data to support the interpretation of the observed trends. We find that the optical properties of aerosol particles have undergone clear and significant changes in the past 2 decades. The scattering Ångstrom exponent exhibits statistically significant decreasing of between -4.9%yr-1 and -6.5%yr-1 (using wavelengths of λ= 450 and 550 nm), while the particle light scattering coefficient exhibits statistically significant increasing trends of between 2.6%yr-1 and 2.9%yr-1 (at a wavelength of λ = 550 nm). The magnitudes of the trends vary depending on the season. These trends indicate a shift to an aerosol dominated more by coarse-mode particles, most likely the result of increases in the relative amount of sea spray aerosol. We show that changes in air mass circulation patterns, specifically an increase in air masses from the south-west, are responsible for the shift in aerosol optical properties, while the decrease of Arctic sea ice in the last 2 decades only had a marginal influence on the observed trends. © Author(s) 2020.
语种	英语
scopus关键词	aerosol; light scattering; marine environment; optical property; sea ice; Arctic
来源期刊	ATMOSPHERIC CHEMISTRY AND PHYSICS
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/247378
作者单位	Department of Environmental Science, Stockholm University, Stockholm, Sweden; Bolin Centre for Climate Research, Stockholm University, Stockholm, Sweden
推荐引用方式 GB/T 7714	Heslin-Rees D.,Burgos M.,Hansson H.C.,et al. From a polar to a marine environment: Has the changing Arctic led to a shift in aerosol light scattering properties?[J],2020,20(21).
APA	Heslin-Rees D..,Burgos M..,Hansson H.C..,Krejci R..,Ström J..,...&Zieger P..(2020).From a polar to a marine environment: Has the changing Arctic led to a shift in aerosol light scattering properties?.ATMOSPHERIC CHEMISTRY AND PHYSICS,20(21).
MLA	Heslin-Rees D.,et al."From a polar to a marine environment: Has the changing Arctic led to a shift in aerosol light scattering properties?".ATMOSPHERIC CHEMISTRY AND PHYSICS 20.21(2020).