气候变化领域集成服务门户(CCPortal): Aircraft-based measurements of High Arctic springtime aerosol show evidence for vertically varying sources; transport and composition

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DOI	10.5194/acp-19-57-2019
	Aircraft-based measurements of High Arctic springtime aerosol show evidence for vertically varying sources; transport and composition
	Willis M.D.; Bozem H.; Kunkel D.; Lee A.K.Y.; Schulz H.; Burkart J.; Aliabadi A.A.; Herber A.B.; Richard Leaitch W.; Abbatt J.P.D.
发表日期	2019
ISSN	16807316
起始页码	57
结束页码	76
卷号	19 期号:1
英文摘要	The sources, chemical transformations and removal mechanisms of aerosol transported to the Arctic are key factors that control Arctic aerosol-climate interactions. Our understanding of sources and processes is limited by a lack of vertically resolved observations in remote Arctic regions. We present vertically resolved observations of trace gases and aerosol composition in High Arctic springtime, made largely north of 80°N, during the NETCARE campaign. Trace gas gradients observed on these flights defined the polar dome as north of 66-68°30′N and below potential temperatures of 283.5-287.5K. In the polar dome, we observe evidence for vertically varying source regions and chemical processing. These vertical changes in sources and chemistry lead to systematic variation in aerosol composition as a function of potential temperature. We show evidence for sources of aerosol with higher organic aerosol (OA), ammonium and refractory black carbon (rBC) content in the upper polar dome. Based on FLEXPART-ECMWF calculations, air masses sampled at all levels inside the polar dome (i.e., potential temperature < 280.5K, altitude < ∼ 3.5km) subsided during transport over transport times of at least 10 days. Air masses at the lowest potential temperatures, in the lower polar dome, had spent long periods (> 10 days) in the Arctic, while air masses in the upper polar dome had entered the Arctic more recently. Variations in aerosol composition were closely related to transport history. In the lower polar dome, the measured sub-micron aerosol mass was dominated by sulfate (mean 74%), with lower contributions from rBC (1%), ammonium (4%) and OA (20%). At higher altitudes and higher potential temperatures, OA, ammonium and rBC contributed 42%, 8% and 2% of aerosol mass, respectively. A qualitative indication for the presence of sea salt showed that sodium chloride contributed to sub-micron aerosol in the lower polar dome, but was not detectable in the upper polar dome. Our observations highlight the differences in Arctic aerosol chemistry observed at surface-based sites and the aerosol transported throughout the depth of the Arctic troposphere in spring. © 2019 Author(s).
语种	英语
scopus关键词	aerial survey; aerosol composition; atmospheric transport; polar region; spring (season); trace gas; vertical distribution; Canada; Canadian 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/144745
作者单位	Department of Chemistry, University of Toronto, Toronto, ON, Canada; Institute for Atmospheric Physics, Johannes Gutenberg University of Mainz, Mainz, Germany; Department of Civil and Environmental Engineering, National University of Singapore, Singapore; Alfred Wegener Institute, Helmholtz Center for Polar and Marine Research, Bremerhaven, Germany; Faculty of Physics, Aerosol Physics and Environmental Physics, University of Vienna, Vienna, Austria; School of Engineering, University of Guelph, Guelph, ON, Canada; Environment and Climate Change Canada, Toronto, ON, Canada; Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA, United States
推荐引用方式 GB/T 7714	Willis M.D.,Bozem H.,Kunkel D.,et al. Aircraft-based measurements of High Arctic springtime aerosol show evidence for vertically varying sources; transport and composition[J],2019,19(1).
APA	Willis M.D..,Bozem H..,Kunkel D..,Lee A.K.Y..,Schulz H..,...&Abbatt J.P.D..(2019).Aircraft-based measurements of High Arctic springtime aerosol show evidence for vertically varying sources; transport and composition.Atmospheric Chemistry and Physics,19(1).
MLA	Willis M.D.,et al."Aircraft-based measurements of High Arctic springtime aerosol show evidence for vertically varying sources; transport and composition".Atmospheric Chemistry and Physics 19.1(2019).