气候变化领域集成服务门户(CCPortal): Arctic Reactive Bromine Events Occur in Two Distinct Sets of Environmental Conditions: A Statistical Analysis of 6 Years of Observations

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DOI	10.1029/2019JD032139
	Arctic Reactive Bromine Events Occur in Two Distinct Sets of Environmental Conditions: A Statistical Analysis of 6 Years of Observations
	Swanson W.; Graham K.A.; Halfacre J.W.; Holmes C.D.; Shepson P.B.; Simpson W.R.
发表日期	2020
ISSN	2169897X
卷号	125 期号:10
英文摘要	Tropospheric bromine radicals in the Arctic efficiently remove ambient ozone and oxidize gaseous elemental mercury. Ground-based bromine monoxide (BrO) observations from the Arctic Ocean and Utqiaġvik (formerly Barrow) are combined with Modern Era Retrospective Analysis for Research and Applications version 2 reanalysis meteorological fields to determine how BrO varies with environmental conditions. The mean seasonal BrO abundance varies from year to year (p < 0.001), while regional variance in mean BrO is not statistically significant (p > 0.11). Principal component analysis derived three important principal components from the environmental data set. The third principal component explains the most variance in BrO and is correlated with low ozone and cold temperatures. This principal component is consistent with high BrO during ozone depletion events at cold temperatures and can work concurrently with each of the other two principal components to generate two distinct environmental types of high BrO events. The first principal component consists of a less-stable, thick, mixed layer and low atmospheric pressure and is consistent with observations of high BrO in low-pressure systems (e.g., storms). The second principal component consists of cold and stable conditions and is consistent with high BrO under surface-based temperature inversions. Our principal component regression model predicted the both the vertical column density of BrO in the lowest 2 km of the troposphere (R = 0.45) and the vertical column density of BrO in the lowest 200 m (R = 0.54). This statistical description of two types of reactive bromine events may help to harmonize space-based and ground-based observations. ©2020. American Geophysical Union. All Rights Reserved.
英文关键词	Arctic; bromine; meteorology; sea ice; statistical analysis; tropospheric chemistry
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/186005
作者单位	Department of Chemistry and Biochemistry and Geophysical Institute, University of Alaska Fairbanks, Fairbanks, AK, United States; Department of Earth, Ocean and Atmospheric Science, Florida State University, Tallahassee, FL, United States; Department of Chemistry, University of York, York, United Kingdom; Department of Chemistry, Purdue University, West Lafayette, IN, United States; School of Marine and Atmospheric Sciences, Stony Brook University, Stony Brook, NY, United States
推荐引用方式 GB/T 7714	Swanson W.,Graham K.A.,Halfacre J.W.,et al. Arctic Reactive Bromine Events Occur in Two Distinct Sets of Environmental Conditions: A Statistical Analysis of 6 Years of Observations[J],2020,125(10).
APA	Swanson W.,Graham K.A.,Halfacre J.W.,Holmes C.D.,Shepson P.B.,&Simpson W.R..(2020).Arctic Reactive Bromine Events Occur in Two Distinct Sets of Environmental Conditions: A Statistical Analysis of 6 Years of Observations.Journal of Geophysical Research: Atmospheres,125(10).
MLA	Swanson W.,et al."Arctic Reactive Bromine Events Occur in Two Distinct Sets of Environmental Conditions: A Statistical Analysis of 6 Years of Observations".Journal of Geophysical Research: Atmospheres 125.10(2020).