1 |
C $Header: /u/gcmpack/MITgcm/pkg/seaice/SEAICE_OPTIONS.h,v 1.21 2007/04/30 00:15:09 jmc Exp $ |
2 |
C $Name: $ |
3 |
|
4 |
C /==========================================================\ |
5 |
C | SEAICE_OPTIONS.h | |
6 |
C | o CPP options file for sea ice package. | |
7 |
C |==========================================================| |
8 |
C | Use this file for selecting options within the sea ice | |
9 |
C | package. | |
10 |
C \==========================================================/ |
11 |
|
12 |
#ifndef SEAICE_OPTIONS_H |
13 |
#define SEAICE_OPTIONS_H |
14 |
#include "PACKAGES_CONFIG.h" |
15 |
#include "CPP_OPTIONS.h" |
16 |
|
17 |
C-- Write "text-plots" of certain fields in STDOUT for debugging. |
18 |
#undef SEAICE_DEBUG |
19 |
|
20 |
C-- Allow sea-ice dynamic code. |
21 |
C This option is provided to allow use of TAMC |
22 |
C on the thermodynamics component of the code only. |
23 |
C Sea-ice dynamics can also be turned off at runtime |
24 |
C using variable SEAICEuseDYNAMICS. |
25 |
#define SEAICE_ALLOW_DYNAMICS |
26 |
|
27 |
C-- By default, pkg/seaice defines forcing variable internally, in |
28 |
C SEAICE_FFIELDS.h, and reads them in from files. When CPP option |
29 |
C SEAICE_EXTERNAL_FORCING is defined, the above forcing variables |
30 |
C are defined and provided by an external package. At present this |
31 |
C option is hardwired for pkg/exf and the variables are passed using |
32 |
C include file EXF_FIELDS.h (=> cannot be defined without pkg/EXF ) |
33 |
#define SEAICE_EXTERNAL_FORCING |
34 |
#ifndef ALLOW_EXF |
35 |
# undef SEAICE_EXTERNAL_FORCING |
36 |
#endif |
37 |
|
38 |
#ifdef SEAICE_EXTERNAL_FORCING |
39 |
# include "EXF_OPTIONS.h" |
40 |
C-- By default, the sea-ice package uses its own integrated bulk |
41 |
C formulae to compute fluxes (fu, fv, EmPmR, Qnet, and Qsw) over |
42 |
C open-ocean. When this flag is set, these variables are computed |
43 |
C in a separate external package, for example, pkg/exf, and then |
44 |
C modified for sea-ice effects by pkg/seaice. |
45 |
# define SEAICE_EXTERNAL_FLUXES |
46 |
|
47 |
#else /* SEAICE_EXTERNAL_FORCING */ |
48 |
C- current implementation requires those options to be set: |
49 |
# undef SEAICE_EXTERNAL_FLUXES |
50 |
# define ALLOW_ATM_TEMP |
51 |
# define ALLOW_DOWNWARD_RADIATION |
52 |
|
53 |
#endif /* SEAICE_EXTERNAL_FORCING */ |
54 |
|
55 |
|
56 |
C-- By default, the sea-ice package uses 2-category thermodynamics. |
57 |
C When this flag is set, an 8-category calculation of ice |
58 |
C thermodynamics is carried out in groatb.F |
59 |
C Note the pickup_seaice.* generated by this option differ |
60 |
C from those generated with the default 2-category model. |
61 |
C Therefore it is not possible to switch between the two |
62 |
C in the middle of an integration. |
63 |
#undef SEAICE_MULTICATEGORY |
64 |
|
65 |
C-- By default cdm wind stress under sea-ice is set to the |
66 |
C same value as it would be if there was no sea-ice. |
67 |
C This is a placeholder until a more physically-sensible |
68 |
C stable solution is developed. Apparently ocean stress |
69 |
C that is based on sea-ice velocity can cause trouble in |
70 |
C Arctic Ocean configurations. This temporary solution |
71 |
C also corresponds to that adopted by CCSM-2. For the |
72 |
C adventurous user who requires ice-modified stress, |
73 |
C following options are available. |
74 |
#undef SEAICE_ORIGINAL_BAD_ICE_STRESS |
75 |
#undef SEAICE_TEST_ICE_STRESS_1 |
76 |
|
77 |
C-- By default the freezing point of water is set to the value of |
78 |
C the parameter SEAICE_freeze (=-1.96 by default). To use a |
79 |
C simple linear dependence of the freezing point on salinity, |
80 |
C set the following flag (pressure is assumed to have no effect, |
81 |
C which is a good assumption for the top 20 meters). With this |
82 |
C option defined the parameter SEAICE_freeze has no effect. |
83 |
#undef SEAICE_VARIABLE_FREEZING_POINT |
84 |
|
85 |
C-- Allow SEAICEuseFlooding, which converts snow to ice if submerged. |
86 |
#undef ALLOW_SEAICE_FLOODING |
87 |
|
88 |
C-- By default the seaice model is discretized on a B-Grid (for |
89 |
C historical reasons). Define the following flag to use a new |
90 |
C (not thoroughly) test version on a C-grid |
91 |
#define SEAICE_CGRID |
92 |
|
93 |
C-- Only for the C-grid version it is possible to enable EVP code by |
94 |
C defining the following flag |
95 |
#ifdef SEAICE_CGRID |
96 |
#define SEAICE_ALLOW_EVP |
97 |
#endif /* SEAICE_CGRID */ |
98 |
|
99 |
#endif /* SEAICE_OPTIONS_H */ |
100 |
|
101 |
CEH3 ;;; Local Variables: *** |
102 |
CEH3 ;;; mode:fortran *** |
103 |
CEH3 ;;; End: *** |