Bromine chemistry mechanism

NOTE: Page under construction!

Overview

Bromine chemistry has been added as an option to run with SMVGEAR or KPP in v.8-03-01 as an extension to the standard model's full chemistry simulation. Important features include:

1.) Add 10 bromine tracers: Br2, Br, BrO, HOBr, HBr, BrNO2, BrONO2, CHBr3, CH2Br2, and CH3Br
2.) 4 source gases:
     - CH3Br: concentrations are set to average CMDL measured concentrations prior to each chemistry step.
     - Very short lived (VSL) source gases:
         - CH2Br2 and CHBr3. These account for > 80% of the VSL organic bromine through the troposphere (WMO, 2007).
         - Emissions are taken from Q. Liang et al. [2010] + a seasonal scaling for CHBr3 at lat > 30N described in J. Parrella et al. [in prep.]
             - 429 Gg CHBr3 / yr; 62 Gg CH2Br2 / yr
     - Sea-salt debromination:
         - Largely follows Yang et al. [2005], treating the debromination as an emission of Br2, constrained to measured bromide depletion factors.
3.) Wet and dry deposition for HBr, HOBr, and BrONO2.