Anthropogenic Influence on Tropospheric Reactive Bromine Since the Pre-industrial: Implications for Arctic Ice-Core Bromine Trends

Shuting Zhai; Joseph R. McConnell; Nathan Chellman; Michel Legrand; Thomas Opel; Hanno Meyer; Lyatt Jaeglé; Kaitlyn Confer; Koji Fujita; Xuan Wang; Becky Alexander

doi:10.1029/2023GL107733

Anthropogenic Influence on Tropospheric Reactive Bromine Since the Pre-industrial: Implications for Arctic Ice-Core Bromine Trends

Shuting Zhai, Joseph R. McConnell, Nathan Chellman, Michel Legrand, Thomas Opel, Hanno Meyer, Lyatt Jaeglé, Kaitlyn Confer, Koji Fujita, Xuan Wang, Becky Alexander^*

^*Corresponding author for this work

School of Energy and Environment

Research output: Journal Publications and Reviews › RGC 21 - Publication in refereed journal › peer-review

7 Citations (Scopus)

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Abstract

Tropospheric reactive bromine (Br_y) influences the oxidation capacity of the atmosphere by acting as a sink for ozone and nitrogen oxides. Aerosol acidity plays a crucial role in Br_y abundances through acid-catalyzed debromination from sea-salt-aerosol, the largest global source. Bromine concentrations in a Russian Arctic ice-core, Akademii Nauk, show a 3.5-fold increase from pre-industrial (PI) to the 1970s (peak acidity, PA), and decreased by half to 1999 (present day, PD). Ice-core acidity mirrors this trend, showing robust correlation with bromine, especially after 1940 (r = 0.9). Model simulations considering anthropogenic emission changes alone show that atmospheric acidity is the main driver of Br_y changes, consistent with the observed relationship between acidity and bromine. The influence of atmospheric acidity on Br_y should be considered in interpretation of ice-core bromine trends. © 2024. The Authors.

Original language	English
Article number	e2023GL107733
Journal	Geophysical Research Letters
Volume	51
Issue number	5
Online published	27 Feb 2024
DOIs	https://doi.org/10.1029/2023GL107733
Publication status	Published - 16 Mar 2024

Funding

Becky Alexander and Shuting Zhai acknowledge support from U.S. National Science Foundation (NSF) grants AGS 2202287 and 1702266. For the ice-core data, Joseph R. McConnell acknowledges support from NSF grants 0909541, 1023672, 1204176, and 1702830, and Nathan Chellman acknowledges support from NSF Grant 2102917. The authors also thank the Alfred Wegener Institute, the U.S. Ice Drilling Program, as well as staff and students of the DRI ice-core laboratory including O. Maselli, D. Pasteris, and L. Layman. Becky Alexander and Shuting Zhai acknowledge support from U.S. National Science Foundation (NSF) grants AGS 2202287 and 1702266. For the ice‐core data, Joseph R. McConnell acknowledges support from NSF grants 0909541, 1023672, 1204176, and 1702830, and Nathan Chellman acknowledges support from NSF Grant 2102917. The authors also thank the Alfred Wegener Institute, the U.S. Ice Drilling Program, as well as staff and students of the DRI ice‐core laboratory including O. Maselli, D. Pasteris, and L. Layman.

Research Keywords

anthropogenic emissions
atmospheric acidity
GEOS-Chem
halogen chemistry
ice core bromine
Russian Arctic

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Zhai, S., McConnell, J. R., Chellman, N., Legrand, M., Opel, T., Meyer, H., Jaeglé, L., Confer, K., Fujita, K., Wang, X., & Alexander, B. (2024). Anthropogenic Influence on Tropospheric Reactive Bromine Since the Pre-industrial: Implications for Arctic Ice-Core Bromine Trends. Geophysical Research Letters, 51(5), Article e2023GL107733. https://doi.org/10.1029/2023GL107733

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abstract = "Tropospheric reactive bromine (Bry) influences the oxidation capacity of the atmosphere by acting as a sink for ozone and nitrogen oxides. Aerosol acidity plays a crucial role in Bry abundances through acid-catalyzed debromination from sea-salt-aerosol, the largest global source. Bromine concentrations in a Russian Arctic ice-core, Akademii Nauk, show a 3.5-fold increase from pre-industrial (PI) to the 1970s (peak acidity, PA), and decreased by half to 1999 (present day, PD). Ice-core acidity mirrors this trend, showing robust correlation with bromine, especially after 1940 (r = 0.9). Model simulations considering anthropogenic emission changes alone show that atmospheric acidity is the main driver of Bry changes, consistent with the observed relationship between acidity and bromine. The influence of atmospheric acidity on Bry should be considered in interpretation of ice-core bromine trends. {\textcopyright} 2024. The Authors.",

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Anthropogenic Influence on Tropospheric Reactive Bromine Since the Pre-industrial: Implications for Arctic Ice-Core Bromine Trends. / Zhai, Shuting; McConnell, Joseph R.; Chellman, Nathan et al.
In: Geophysical Research Letters, Vol. 51, No. 5, e2023GL107733, 16.03.2024.

Research output: Journal Publications and Reviews › RGC 21 - Publication in refereed journal › peer-review

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T2 - Implications for Arctic Ice-Core Bromine Trends

AU - Zhai, Shuting

AU - McConnell, Joseph R.

AU - Chellman, Nathan

AU - Legrand, Michel

AU - Opel, Thomas

AU - Meyer, Hanno

AU - Jaeglé, Lyatt

AU - Confer, Kaitlyn

AU - Fujita, Koji

AU - Wang, Xuan

AU - Alexander, Becky

PY - 2024/3/16

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N2 - Tropospheric reactive bromine (Bry) influences the oxidation capacity of the atmosphere by acting as a sink for ozone and nitrogen oxides. Aerosol acidity plays a crucial role in Bry abundances through acid-catalyzed debromination from sea-salt-aerosol, the largest global source. Bromine concentrations in a Russian Arctic ice-core, Akademii Nauk, show a 3.5-fold increase from pre-industrial (PI) to the 1970s (peak acidity, PA), and decreased by half to 1999 (present day, PD). Ice-core acidity mirrors this trend, showing robust correlation with bromine, especially after 1940 (r = 0.9). Model simulations considering anthropogenic emission changes alone show that atmospheric acidity is the main driver of Bry changes, consistent with the observed relationship between acidity and bromine. The influence of atmospheric acidity on Bry should be considered in interpretation of ice-core bromine trends. © 2024. The Authors.

AB - Tropospheric reactive bromine (Bry) influences the oxidation capacity of the atmosphere by acting as a sink for ozone and nitrogen oxides. Aerosol acidity plays a crucial role in Bry abundances through acid-catalyzed debromination from sea-salt-aerosol, the largest global source. Bromine concentrations in a Russian Arctic ice-core, Akademii Nauk, show a 3.5-fold increase from pre-industrial (PI) to the 1970s (peak acidity, PA), and decreased by half to 1999 (present day, PD). Ice-core acidity mirrors this trend, showing robust correlation with bromine, especially after 1940 (r = 0.9). Model simulations considering anthropogenic emission changes alone show that atmospheric acidity is the main driver of Bry changes, consistent with the observed relationship between acidity and bromine. The influence of atmospheric acidity on Bry should be considered in interpretation of ice-core bromine trends. © 2024. The Authors.

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Anthropogenic Influence on Tropospheric Reactive Bromine Since the Pre-industrial: Implications for Arctic Ice-Core Bromine Trends

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Funding

Research Keywords

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