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Environ Sci Technol

Title:		Constraints on Arctic Atmospheric Chlorine Production through Measurements and Simulations of Cl(2) and ClO
Author(s):		Custard KD; Pratt KA; Wang S; Shepson PB;
Address:		"Department of Chemistry, Purdue University , West Lafayette, Indiana 47907, United States. Department of Chemistry, University of Michigan , Ann Arbor, Michigan 48109, United States. Department of Earth & Environmental Sciences, University of Michigan , Ann Arbor, Michigan 48109, United States. Department of Earth, Atmospheric, and Planetary Sciences and Purdue Climate Change Research Center, Purdue University , West Lafayette, Indiana 47907, United States"
Journal Title:		Environ Sci Technol
Year:		2016
Volume:		20161107
Issue:		22
Page Number:		12394 - 12400
DOI:		10.1021/acs.est.6b03909
ISSN/ISBN:		1520-5851 (Electronic) 0013-936X (Linking)
Abstract:		"During springtime, unique halogen chemistry involving chlorine and bromine atoms controls the prevalence of volatile organic compounds, ozone, and mercury in the Arctic lower troposphere. In situ measurements of the chlorine monoxide radical, ClO, and its precursor, Cl(2), along with BrO and Br(2), were conducted using chemical ionization mass spectrometry (CIMS) during the Bromine, Ozone, and Mercury Experiment (BROMEX) near Barrow, Alaska, in March 2012. To our knowledge, these data represent the first ClO measurements made using CIMS. A maximum daytime ClO concentration of 28 ppt was observed following an early morning peak of 75 ppt of Cl(2). A zero-dimensional photochemistry model was constrained to Cl(2) observations and used to simulate ClO during a 7-day period of the field campaign. The model simulates ClO within the measurement uncertainty, and the model results highlight the importance of chlorine chemistry participation in bromine radical cycling, as well as the dependence of halogen chemistry on NO(x) levels. The ClO measurements and simulations are consistent with Cl(2) being the dominant Cl atom source in the Arctic boundary layer. Simulated Cl atom concentrations, up to approximately 1 x 10(6) molecules cm(-3), highlight the importance of chlorine chemistry in the degradation of volatile organic compounds, including the greenhouse gas methane"
Keywords:		Arctic Regions *Atmosphere Bromine/chemistry Chlorine/*chemistry Halogens/chemistry Ozone/*chemistry;
Notes:		"MedlineCustard, Kyle D Pratt, Kerri A Wang, Siyuan Shepson, Paul B eng Research Support, U.S. Gov't, Non-P.H.S. 2016/10/22 Environ Sci Technol. 2016 Nov 15; 50(22):12394-12400. doi: 10.1021/acs.est.6b03909. Epub 2016 Nov 7"