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:
   1. CH3Br: PBL concentrations are set to average CMDL measured concentrations prior to each chemistry step.
   2. 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
   3. Sea-salt debromination:
      1. Largely follows Yang et al. [2005], treating the debromination as an emission of Br2, constrained to measured bromide depletion factors.
      2. 1.4 Tg Br2 / yr using the Monahan sea-salt production function and coarse aerosol bin range of 0.5 - 10 um.
3. Wet and dry deposition for HBr, HOBr, and BrONO2.

Code should be made available soon. This wiki page is under construction, but feel free to contact Justin Parrella (parrella@fas.harvard.edu) with any questions about the code.