气候变化领域集成服务门户(CCPortal): Seasonal Cycle of Isotope-Based Source Apportionment of Elemental Carbon in Airborne Particulate Matter and Snow at Alert, Canada

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DOI	10.1029/2020JD033125
	Seasonal Cycle of Isotope-Based Source Apportionment of Elemental Carbon in Airborne Particulate Matter and Snow at Alert, Canada
	Rodríguez B.T.; Huang L.; Santos G.M.; Zhang W.; Vetro V.; Xu X.; Kim S.; Czimczik C.I.
发表日期	2020
ISSN	2169897X
卷号	125 期号:23
英文摘要	Elemental carbon (EC) is a major light-absorbing component of atmospheric aerosol particles. Here, we report the seasonal variation in EC concentrations and sources in airborne particulate matter (PM) and snow at Alert, Canada, from March 2014 to June 2015. We isolated the EC fraction with the EnCan-Total-900 (ECT9) protocol and quantified its stable carbon isotope composition (δ13C) and radiocarbon content (∆14C) to apportion EC into contributions from fossil fuel combustion and biomass burning (wildfires and biofuel combustion). Ten-day backward trajectories show EC aerosols reaching Alert by traveling over the Arctic Ocean from the Russian Arctic during winter and from North America (>40°N) during summer. EC concentrations range from 1.8–135.3 ng C m−3 air (1.9–41.2% of total carbon [TC], n = 48), with lowest values in summer (1.8–44.5 ng C m−3 air, n = 9). EC in PM (Δ14C = -532 ± 114‰ [ave. ± SD, n = 20]) and snow (−257 ± 131‰, n = 7) was depleted in 14C relative to current ambient CO2 year-round. EC in PM mainly originated from liquid and solid fossil fuels from fall to spring (47–70% fossil), but had greater contributions from biomass burning in summer (48–80% modern carbon). EC in snow was mostly from biomass burning (53–88%). Our data show that biomass burning EC is preferentially incorporated into snow because of scavenging processes within the Arctic atmosphere or long-range transport in storm systems. This work provides a comprehensive view of EC particles captured in the High Arctic through wet and dry deposition and demonstrates that surface stations monitoring EC in PM might underestimate biomass burning and transport. ©2020. American Geophysical Union. All Rights Reserved.
英文关键词	Arctic; black carbon; carbonaceous aerosol; ECT9; organic carbon; radiocarbon
语种	英语
来源期刊	Journal of Geophysical Research: Atmospheres
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/185607
作者单位	Department of Earth System Science, University of California, Irvine, CA, United States; Climate Research Division, Atmospheric Science and Technology Directorate/Science and Technology Branch, Environment and Climate Change Canada, Toronto, ON, Canada
推荐引用方式 GB/T 7714	Rodríguez B.T.,Huang L.,Santos G.M.,et al. Seasonal Cycle of Isotope-Based Source Apportionment of Elemental Carbon in Airborne Particulate Matter and Snow at Alert, Canada[J],2020,125(23).
APA	Rodríguez B.T..,Huang L..,Santos G.M..,Zhang W..,Vetro V..,...&Czimczik C.I..(2020).Seasonal Cycle of Isotope-Based Source Apportionment of Elemental Carbon in Airborne Particulate Matter and Snow at Alert, Canada.Journal of Geophysical Research: Atmospheres,125(23).
MLA	Rodríguez B.T.,et al."Seasonal Cycle of Isotope-Based Source Apportionment of Elemental Carbon in Airborne Particulate Matter and Snow at Alert, Canada".Journal of Geophysical Research: Atmospheres 125.23(2020).