GENIE:RokGeM

Greg Colbourn (g.colbourn@uea.ac.uk)

Summary

 * Name of model: RokGeM (Rock Geochemistry Module)


 * Authors/Constructors: Greg Colbourn (UEA) & Andy Ridgwell (Bristol)


 * Reference and description: None as yet, Geoscientific Model Development paper forthcoming


 * Original version: n/a


 * Units: SI (but some things use yr-1 instead of s-1 at the moment)


 * Sign convention: n/a


 * Grid: As ocean (only currently available on 36x36 equal area grid)


 * Timestep: default 5 per ocean timestep (500/year, as for EMBM)


 * Checks to ensure continuity: n/a


 * Dynamical variables: DIC into coastal ocean.

Processes modelled

 * Global average weathering, with temperatue and Productivity feedback
 * Spatially explicit lithology dependent weathering

Model tuning
Nothing yet.

Values for key parameters

 * {| border="1" cellpadding="3"

!Parameter !Label !Value !Units
 * Reference global mean average land surface temperature
 * par_weather_T0
 * 8.45
 * C
 * Reference global mean average productivity
 * par_weather_P0
 * 0.76
 * kgC m-2 yr-1
 * CO2 outgassing rate (mol C yr-1)
 * par_outgas_CO2
 * 5E12
 * mol C yr-1
 * Mean volcanic/metamorphic d13C
 * par_outgas_CO2_13C
 * '-5.0'
 * o/oo
 * Global silicate weathering rate
 * par_weather_CaSiO3
 * 10.0E12
 * mol CaSiO3 yr-1
 * Global carbonate weathering rate
 * par_weather_CaCO3
 * 10.0E12
 * mol CaCO3 yr-1
 * Mean carbonate d13C
 * par_weather_CaCO3_13C
 * 0.0
 * o/oo
 * }
 * mol CaCO3 yr-1
 * Mean carbonate d13C
 * par_weather_CaCO3_13C
 * 0.0
 * o/oo
 * }
 * }
 * }

Couplings to other modules

 * Land-Atmosphere (EMBM)
 * Ocean-Biogeochemistry (BioGeM)
 * Land Vegetation (ENTS)
 * Atmosphere Chemistry (AtCheM)

Land-Atmosphere I/O

 * Inputs:
 * Air temperature (K)
 * Run-off


 * Outputs:
 * None

Land-Ocean I/O

 * Outputs:
 * ALK
 * DIC
 * Ca

Land-Atmospheric Chemistry I/O

 * Inputs:
 * None

CO2 (negative flux)
 * Outputs:

Prescribed inputs
None

Empirical relationships
There are a couple of new empirical relationships used in the model:
 * Flux of bicarbonate ($$F$$)
 * $$ F = k R ^ f $$ (Gibbs et al., 1999; $$r $$= run-off, $$k$$ and $$f$$ empirical constants dependent on lithology)
 * $$F = k R $$ (Amoitte-Suchet et al., 2003; $$r$$ = run-off, $$k$$ empirical constant dependent on lithology)