气候变化领域集成服务门户(CCPortal): Characterization of aerosol growth events over Ellesmere Island during the summers of 2015 and 2016

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DOI	10.5194/acp-19-5589-2019
	Characterization of aerosol growth events over Ellesmere Island during the summers of 2015 and 2016
	Tremblay S.; Picard J.-C.; Bachelder J.O.; Lutsch E.; Strong K.; Fogal P.; Richard Leaitch W.; Sharma S.; Kolonjari F.; Cox C.J.; Chang R.Y.-W.; Hayes P.L.
发表日期	2019
ISSN	16807316
起始页码	5589
结束页码	5604
卷号	19 期号:8
英文摘要	The occurrence of frequent aerosol nucleation and growth events in the Arctic during summertime may impact the region's climate through increasing the number of cloud condensation nuclei in the Arctic atmosphere. Measurements of aerosol size distributions and aerosol composition were taken during the summers of 2015 and 2016 at Eureka and Alert on Ellesmere Island in Nunavut, Canada. These results provide a better understanding of the frequency and spatial extent of elevated Aitken mode aerosol concentrations as well as of the composition and sources of aerosol mass during particle growth. Frequent appearances of small particles followed by growth occurred throughout the summer. These particle growth events were observed beginning in June with the melting of the sea ice rather than with the polar sunrise, which strongly suggests that influence from the marine boundary layer was the primary cause of the events. Correlated particle growth events at the two sites, separated by 480 km, indicate conditions existing over large scales play a key role in determining the timing and the characteristics of the events. In addition, aerosol mass spectrometry measurements were used to analyze the size-resolved chemical composition of aerosols during two selected growth events. It was found that particles with diameters between 50 and 80 nm (physical diameter) during these growth events were predominately organic with only a small sulfate contribution. The oxidation of the organics also changed with particle size, with the fraction of organic acids increasing with diameter from 80 to 400 nm. The growth events at Eureka were observed most often when the temperature inversion between the sea and the measurement site (at 610ma.s.l.) was non-existent or weak, presumably creating conditions with low aerosol condensation sink and allowing fresh marine emissions to be mixed upward to the observatory's altitude. While the nature of the gaseous precursors responsible for the growth events is still poorly understood, oxidation of dimethyl sulfide alone to produce particle-phase sulfate or methanesulfonic acid was inconsistent with the measured aerosol composition, suggesting the importance of other gas-phase organic compounds condensing for particle growth.. © Author(s) 2019.
语种	英语
scopus关键词	aerosol; cloud condensation nucleus; concentration (composition); oxidation; particle size; size distribution; summer; Canada; Ellesmere Island; Nunavut; Queen Elizabeth Islands
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/144456
作者单位	Department of Chemistry, Université de Montréal, Montréal, QC, Canada; Department of Physics, University of Toronto, Toronto, ON, Canada; Climate Research Division, Environment and Climate Change Canada, Toronto, ON, Canada; Cooperative Institute for Research in Environmental Sciences (CIRES), Boulder, CO, United States; NOAA Physical Sciences Division, Boulder, CO, United States; Department of Physics and Atmospheric Science, Dalhousie University, Halifax, NS, Canada
推荐引用方式 GB/T 7714	Tremblay S.,Picard J.-C.,Bachelder J.O.,et al. Characterization of aerosol growth events over Ellesmere Island during the summers of 2015 and 2016[J],2019,19(8).
APA	Tremblay S..,Picard J.-C..,Bachelder J.O..,Lutsch E..,Strong K..,...&Hayes P.L..(2019).Characterization of aerosol growth events over Ellesmere Island during the summers of 2015 and 2016.Atmospheric Chemistry and Physics,19(8).
MLA	Tremblay S.,et al."Characterization of aerosol growth events over Ellesmere Island during the summers of 2015 and 2016".Atmospheric Chemistry and Physics 19.8(2019).