pism

[fork] customized build of PISM, the parallel ice sheet model (tillflux branch)
git clone git://src.adamsgaard.dk/pism # fast
git clone https://src.adamsgaard.dk/pism.git # slow
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disabling.rst (1184B)


      1 .. include:: ../../global.txt
      2 
      3 .. _sec-turning-off:
      4 
      5 Disabling sub-models
      6 --------------------
      7 
      8 Certain major model components, unlike more peripheral ones like bed deformation or
      9 calving, are "on" by default. They do not need to be turned on explicitly. For example,
     10 the SIA computation is so common that it would be a hassle to require an option to turn it
     11 on every time you need it.
     12 
     13 But sometimes one wants to disable particular components, during model spin-up, for
     14 example. PISM has the following "off" switches:
     15 
     16 - :opt:`-no_mass` disables the mass-continuity (conservation of mass) step
     17 - :opt:`-energy none` disables the conservation of energy computation
     18 - :opt:`-energy cold` makes PISM use temperature instead of enthalpy in the energy
     19   conservation code
     20 - :opt:`-stress_balance none` disables the stress balance computation (useful for testing
     21   surface mass balance inputs)
     22 - :opt:`-dry` essentially disables ocean models: ice is always considered to be grounded,
     23   the sub-shelf melt rate and temperature is not used, and the calving-front boundary
     24   condition is computed ignoring the water pressure exerted on the vertical face at a
     25   (possibly submerged) terminus.