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DOI	10.1029/2020JD033015
	Measurements of Tropospheric Bromine Monoxide Over Four Halogen Activation Seasons in the Canadian High Arctic
	Bognar K.; Zhao X.; Strong K.; Chang R.Y.W.; Frieß U.; Hayes P.L.; McClure-Begley A.; Morris S.; Tremblay S.; Vicente-Luis A.
发表日期	2020
ISSN	2169897X
卷号	125 期号:18
英文摘要	Bromine explosions and corresponding ozone depletion events are common in the Arctic spring. The snowpack on sea ice and sea salt aerosols (SSA) are both thought to release bromine, but the relative contribution of each source is not yet known. Furthermore, the role of atmospheric conditions is not fully understood. Long-term measurements of bromine monoxide (BrO) provide useful insight into the underlying processes of bromine activation. Here we present a 4-year data set (2016–2019) of springtime BrO partial columns retrieved from Multi-AXis Differential Optical Absorption Spectroscopy (MAX-DOAS) measurements in Eureka, Canada (80.1°N, 86.4°W, 610 m asl). Due to the elevation of the measurement site, the instrument often measures BrO in the free troposphere, except during strong wind episodes and storms that generate a deep boundary layer. Enhanced vertical mixing due to strong winds leads to increasing BrO values and reduced ozone depletion. We find that BrO enhancements show two modes differentiated by local wind direction and air mass history. Longer time spent by the airmass in first-year sea ice areas corresponds to increased BrO for one of these modes only. Furthermore, we argue that snow on multiyear ice might also contribute to bromine release. High aerosol optical depth is required to maintain lofted BrO, and we show that the presence of coarse-mode aerosols (>0.5 μm, likely SSA) is a necessary and sufficient condition for observing BrO at our elevated measurement site in Eureka. This work highlights the importance of considering variable local conditions when characterizing bromine activation. ©2020. American Geophysical Union. All Rights Reserved.
英文关键词	bromine monoxide; halogen activation; high Arctic; PEARL
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/185775
作者单位	Department of Physics, University of Toronto, Toronto, ON, Canada; Air Quality Research Division, Environment and Climate Change Canada, Toronto, ON, Canada; Department of Physics and Atmospheric Science, Dalhousie University, Halifax, NS, Canada; Institute of Environmental Physics, University of Heidelberg, Heidelberg, Germany; Department of Chemistry, University of Montreal, Montreal, QC, Canada; NOAA Earth System Research Laboratory, Boulder, CO, United States
推荐引用方式 GB/T 7714	Bognar K.,Zhao X.,Strong K.,et al. Measurements of Tropospheric Bromine Monoxide Over Four Halogen Activation Seasons in the Canadian High Arctic[J],2020,125(18).
APA	Bognar K..,Zhao X..,Strong K..,Chang R.Y.W..,Frieß U..,...&Vicente-Luis A..(2020).Measurements of Tropospheric Bromine Monoxide Over Four Halogen Activation Seasons in the Canadian High Arctic.Journal of Geophysical Research: Atmospheres,125(18).
MLA	Bognar K.,et al."Measurements of Tropospheric Bromine Monoxide Over Four Halogen Activation Seasons in the Canadian High Arctic".Journal of Geophysical Research: Atmospheres 125.18(2020).