Articles | Volume 24, issue 6
Research article
 | Highlight paper
20 Mar 2024
Research article | Highlight paper |  | 20 Mar 2024

Observations of cyanogen bromide (BrCN) in the global troposphere and their relation to polar surface O3 destruction

James M. Roberts, Siyuan Wang, Patrick R. Veres, J. Andrew Neuman, Michael A. Robinson, Ilann Bourgeois, Jeff Peischl, Thomas B. Ryerson, Chelsea R. Thompson, Hannah M. Allen, John D. Crounse, Paul O. Wennberg, Samuel R. Hall, Kirk Ullmann, Simone Meinardi, Isobel J. Simpson, and Donald Blake


Interactive discussion

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on egusphere-2023-860', Anonymous Referee #1, 19 Jun 2023
    • AC1: 'Reply on RC1', James Roberts, 21 Oct 2023
  • RC2: 'Comment on egusphere-2023-860', Anonymous Referee #2, 11 Jul 2023
    • AC2: 'Reply on RC2', James Roberts, 21 Oct 2023

Peer review completion

AR: Author's response | RR: Referee report | ED: Editor decision | EF: Editorial file upload
AR by James Roberts on behalf of the Authors (16 Nov 2023)  Author's response   Author's tracked changes   Manuscript 
ED: Referee Nomination & Report Request started (27 Nov 2023) by Markus Ammann
RR by Anonymous Referee #2 (11 Dec 2023)
ED: Publish subject to minor revisions (review by editor) (11 Dec 2023) by Markus Ammann
AR by James Roberts on behalf of the Authors (16 Jan 2024)  Author's response   Author's tracked changes   Manuscript 
ED: Publish as is (18 Jan 2024) by Markus Ammann
AR by James Roberts on behalf of the Authors (02 Feb 2024)  Manuscript 
Executive editor
Bromine chemistry in polar regions is important for the composition of the atmosphere as well as climate. Reactive bromine strongly affects the oxidation capacity and the local ozone budget, and through the export to lower latitudes, it affects the ozone budget and the atmosphere's radiative properties outside polar regions. The newly identified bromine reservoir changes our understanding of the chemical budgets of polar halogens which will have implications for the ozone and mercury removal cycles.
Short summary
We measured cyanogen bromide (BrCN) in the troposphere for the first time. BrCN is a product of the same active bromine chemistry that destroys ozone and removes mercury in polar surface environments and is a previously unrecognized sink for active Br compounds. BrCN has an apparent lifetime against heterogeneous loss in the range 1–10 d, so it serves as a cumulative marker of Br-radical chemistry. Accounting for BrCN chemistry is an important part of understanding polar Br cycling.
Final-revised paper