Difference between revisions of "Bromine chemistry mechanism"

From Geos-chem
Jump to: navigation, search
(New page: '''''NOTE: Page under construction!''''' == Overview == == Source code and data files == == References == == Known issues ==)
 
(Overview)
Line 2: Line 2:
  
 
== Overview ==
 
== 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.
  
 
== Source code and data files ==
 
== Source code and data files ==

Revision as of 19:02, 1 July 2010

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.

Source code and data files

References

Known issues