Bromine chemistry mechanism
NOTE: Page under construction!
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:
- Add 10 bromine tracers: Br2, Br, BrO, HOBr, HBr, BrNO2, BrONO2, CHBr3, CH2Br2, and CH3Br
- 4 source gases:
- CH3Br: PBL 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.  + 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. , treating the debromination as an emission of Br2, constrained to measured bromide depletion factors.
- 1.4 Tg Br2 / yr using the Monahan sea-salt production function and coarse aerosol bin range of 0.5 - 10 um.
- 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 (firstname.lastname@example.org) with any questions about the code.