GENIE:ENTS

Summary

 * Name of model: ENTS (Efficient Numerical Terrestrial Scheme)


 * Authors/Constructors: Mark Williamson (Tyndall) & Tim Lenton (UEA)


 * Reference and description: Williamson et al. (2006)


 * Original version: n/a


 * Units: SI


 * Sign convention: positive into atmosphere (fluxes of heat, moisture and carbon)


 * 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:


 * Dynamical variables: Vegetation carbon, soil carbon, soil water (equilibrium land temperature is calculated analytically at each timestep)

Processes modelled

 * Vertical exchange of heat, moisture and carbon dioxide with atmosphere
 * Uptake of carbon dioxide in photosynthesis, release in vegetation respiration and soil respiration, exchange from vegetation to soil in litter fall
 * Accumulation (from precipitation) and loss (in runoff) of soil water using a simple bucket model but with bucket capacity a function of soil carbon content (sponge effect)
 * Precipitation as snow and maintenance of snow cover if land temperature less than 0 deg.C
 * Changes in land surface albedo due to changes in vegetation, soil and snow cover

Key parameters commonly used for tuning / model configuration

 * coming soon

Tuned values for key parameters
These are based on...


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Couplings to other modules

 * Land-Atmosphere (EMBM) – pending finalisation of modularisation
 * Land-Ocean (GOLDSTEIN)
 * Land-Atmospheric Chemistry (ATCHEM)

Land-Atmosphere I/O

 * Inputs:
 * some fluxes - to be completed


 * Outputs:
 * Land surface temperature (deg. C)
 * Soil Moisture (m water equivalent)


 * Runoff (m s-1 equivalent at coastal gridboxes, according to simple catchment areas) – optional (if not coupled to Land)

Land-Atmospheric Chemistry I/O

 * Inputs:
 * CO2 (ppm)


 * Outputs:
 * net CO2 exchange flux (PgC/yr)

Prescribed inputs

 * None?