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.