tdisabling.rst - pism - [fork] customized build of PISM, the parallel ice sheet model (tillflux branch)
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       tdisabling.rst (1184B)
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            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.