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C $Header: /u/gcmpack/MITgcm/pkg/seaice/SEAICE_OPTIONS.h,v 1.81 2017/04/28 17:20:33 mlosch Exp $ |
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C $Name: $ |
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C *==========================================================* |
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C | SEAICE_OPTIONS.h |
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C | o CPP options file for sea ice package. |
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C *==========================================================* |
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C | Use this file for selecting options within the sea ice |
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C | package. |
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C *==========================================================* |
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#ifndef SEAICE_OPTIONS_H |
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#define SEAICE_OPTIONS_H |
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#include "PACKAGES_CONFIG.h" |
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#include "CPP_OPTIONS.h" |
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#ifdef ALLOW_SEAICE |
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C Package-specific Options & Macros go here |
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C-- Write "text-plots" of certain fields in STDOUT for debugging. |
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#undef SEAICE_DEBUG |
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C-- Allow sea-ice dynamic code. |
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C This option is provided to allow use of TAMC |
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C on the thermodynamics component of the code only. |
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C Sea-ice dynamics can also be turned off at runtime |
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C using variable SEAICEuseDYNAMICS. |
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#define SEAICE_ALLOW_DYNAMICS |
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C-- By default, the sea-ice package uses its own integrated bulk |
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C formulae to compute fluxes (fu, fv, EmPmR, Qnet, and Qsw) over |
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C open-ocean. When this flag is set, these variables are computed |
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C in a separate external package, for example, pkg/exf, and then |
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C modified for sea-ice effects by pkg/seaice. |
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#define SEAICE_EXTERNAL_FLUXES |
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C-- Exclude Wind-Stress common block (in SEAICE.h). This option |
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C should ALWAYS been left undef (just listed here for the record) |
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#undef SEAICE_EXCLUDE_WIND_STRESS |
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C-- This CPP flag has been retired. The number of ice categories |
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C used to solve for seaice flux is now specified by run-time |
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C parameter SEAICE_multDim. |
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C Note: be aware of pickup_seaice.* compatibility issues when |
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C restarting a simulation with a different number of categories. |
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c#define SEAICE_MULTICATEGORY |
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C-- run with sea Ice Thickness Distribution (ITD); |
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C set number of categories (nITD) in SEAICE_SIZE.h |
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#undef SEAICE_ITD |
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C-- Since the missing sublimation term is now included |
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C this flag is needed for backward compatibility |
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#undef SEAICE_DISABLE_SUBLIM |
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C-- Suspected missing term in coupled ocn-ice heat budget (to be confirmed) |
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#undef SEAICE_DISABLE_HEATCONSFIX |
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C-- Default is constant seaice salinity (SEAICE_salt0); Define the following |
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C flag to consider (space & time) variable salinity: advected and forming |
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C seaice with a fraction (=SEAICE_saltFrac) of freezing seawater salinity. |
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C- Note: SItracer also offers an alternative way to handle variable salinity. |
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#define SEAICE_VARIABLE_SALINITY |
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C-- Tracers of ice and/or ice cover. |
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#undef ALLOW_SITRACER |
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#ifdef ALLOW_SITRACER |
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C-- To try avoid 'spontaneous generation' of tracer maxima by advdiff. |
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# define ALLOW_SITRACER_ADVCAP |
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#endif |
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C-- Enable grease ice parameterization |
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C The grease ice parameterization delays formation of solid |
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C sea ice from frazil ice by a time constant and provides a |
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C dynamic calculation of the initial solid sea ice thickness |
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C HO as a function of winds, currents and available grease ice |
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C volume. Grease ice does not significantly reduce heat loss |
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C from the ocean in winter and area covered by grease is thus |
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C handled like open water. |
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C (For details see Smedsrud and Martin, 2014, Ann.Glac.) |
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C Set SItrName(1) = 'grease' in namelist SEAICE_PARM03 in data.seaice |
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C then output SItr01 is SItrNameLong(1) = 'grease ice volume fraction', |
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C with SItrUnit(1) = '[0-1]', which needs to be multiplied by SIheff |
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C to yield grease ice volume. Additionally, the actual grease ice |
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C layer thickness (diagnostic SIgrsLT) can be saved. |
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#undef SEAICE_GREASE |
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C-- grease ice uses SItracer: |
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#ifdef SEAICE_GREASE |
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# define ALLOW_SITRACER |
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# define ALLOW_SITRACER_ADVCAP |
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#endif |
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C-- By default the seaice model is discretized on a B-Grid (for |
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C historical reasons). Define the following flag to use a new |
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C (not thoroughly) test version on a C-grid |
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#define SEAICE_CGRID |
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C-- Only for the C-grid version it is possible to |
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#ifdef SEAICE_CGRID |
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C enable advection of sea ice momentum |
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# undef SEAICE_ALLOW_MOM_ADVECTION |
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C enable JFNK code by defining the following flag |
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# define SEAICE_ALLOW_JFNK |
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C enable Krylov code by defining the following flag |
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# define SEAICE_ALLOW_KRYLOV |
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C enable LSR to use global (multi-tile) tri-diagonal solver |
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# undef SEAICE_GLOBAL_3DIAG_SOLVER |
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C enable EVP code by defining the following flag |
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# define SEAICE_ALLOW_EVP |
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# ifdef SEAICE_ALLOW_EVP |
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C-- When set use SEAICE_zetaMin and SEAICE_evpDampC to limit viscosities |
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C from below and above in seaice_evp: not necessary, and not recommended |
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# undef SEAICE_ALLOW_CLIPZETA |
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# endif /* SEAICE_ALLOW_EVP */ |
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C smooth regularization (without max-function) of delta for |
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C better differentiability |
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# undef SEAICE_DELTA_SMOOTHREG |
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C regularize zeta to zmax with a smooth tanh-function instead |
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C of a min(zeta,zmax). This improves convergence of iterative |
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C solvers (Lemieux and Tremblay 2009, JGR). No effect on EVP |
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# undef SEAICE_ZETA_SMOOTHREG |
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C allow the truncated ellipse rheology (runtime flag SEAICEuseTEM) |
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# undef SEAICE_ALLOW_TEM |
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C Use LSR vector code; not useful on non-vector machines, because it |
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C slows down convergence considerably, but the extra iterations are |
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C more than made up by the much faster code on vector machines. For |
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C the only regularly test vector machine these flags a specified |
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C in the build options file SUPER-UX_SX-8_sxf90_awi, so that we comment |
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C them out here. |
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# undef SEAICE_VECTORIZE_LSR |
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C Use zebra-method (alternate lines) for line-successive-relaxation |
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C This modification improves the convergence of the vector code |
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C dramatically, so that is may actually be useful in general, but |
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C that needs to be tested. Can be used without vectorization options. |
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# undef SEAICE_LSR_ZEBRA |
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C Use parameterisation of grounding ice for a better representation |
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C of fastice in shallow seas |
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# undef SEAICE_ALLOW_BOTTOMDRAG |
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#else /* not SEAICE_CGRID, but old B-grid */ |
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C-- By default for B-grid dynamics solver wind stress under sea-ice is |
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C set to the same value as it would be if there was no sea-ice. |
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C Define following CPP flag for B-grid ice-ocean stress coupling. |
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# define SEAICE_BICE_STRESS |
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C-- By default for B-grid dynamics solver surface tilt is obtained |
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C indirectly via geostrophic velocities. Define following CPP |
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C in order to use ETAN instead. |
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# define EXPLICIT_SSH_SLOPE |
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C-- Defining this flag turns on FV-discretization of the B-grid LSOR solver. |
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C It is smoother and includes all metric terms, similar to C-grid solvers. |
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C It is here for completeness, but its usefulness is unclear. |
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# undef SEAICE_LSRBNEW |
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#endif /* SEAICE_CGRID */ |
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C-- When set limit the Ice-Loading to mass of 1/5 of Surface ocean grid-box |
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#undef SEAICE_CAP_ICELOAD |
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C-- When set use SEAICE_clipVelocties = .true., to clip U/VICE at 40cm/s, |
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C not recommended |
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#undef SEAICE_ALLOW_CLIPVELS |
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C-- When set cap the sublimation latent heat flux in solve4temp according |
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C to the available amount of ice+snow. Otherwise this term is treated |
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C like all of the others -- residuals heat and fw stocks are passed to |
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C the ocean at the end of seaice_growth in a conservative manner. |
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C SEAICE_CAP_SUBLIM is not needed as of now, but kept just in case. |
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#undef SEAICE_CAP_SUBLIM |
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C-- Enable free drift code |
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#undef SEAICE_ALLOW_FREEDRIFT |
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C-- pkg/seaice cost functions compile flags |
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c >>> Sea-ice volume (requires pkg/cost) |
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#undef ALLOW_COST_ICE |
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c >>> Sea-ice misfit to obs (requires pkg/cost and ecco) |
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#undef ALLOW_SEAICE_COST_SMR_AREA |
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#endif /* ALLOW_SEAICE */ |
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#endif /* SEAICE_OPTIONS_H */ |
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CEH3 ;;; Local Variables: *** |
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CEH3 ;;; mode:fortran *** |
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CEH3 ;;; End: *** |
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