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Contents of /MITgcm/verification/offline_exf_seaice/README

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Revision 1.2 - (show annotations) (download)
Sat Mar 30 15:07:23 2013 UTC (7 years ago) by jmc
Branch: MAIN
CVS Tags: checkpoint64y, checkpoint64x, checkpoint64z, checkpoint64o, checkpoint64q, checkpoint64p, checkpoint64s, checkpoint64r, checkpoint64u, checkpoint64t, checkpoint64w, checkpoint64v, checkpoint66g, checkpoint66f, checkpoint66e, checkpoint66d, checkpoint66c, checkpoint66b, checkpoint66a, checkpoint64n, checkpoint66o, checkpoint66n, checkpoint66m, checkpoint66l, checkpoint66k, checkpoint66j, checkpoint66i, checkpoint66h, checkpoint64g, checkpoint64f, checkpoint65z, checkpoint65x, checkpoint65y, checkpoint65r, checkpoint65s, checkpoint65p, checkpoint65q, checkpoint65v, checkpoint65w, checkpoint65t, checkpoint65u, checkpoint65j, checkpoint65k, checkpoint65h, checkpoint65i, checkpoint65n, checkpoint65o, checkpoint65l, checkpoint65m, checkpoint65b, checkpoint65c, checkpoint65a, checkpoint65f, checkpoint65g, checkpoint65d, checkpoint65e, checkpoint64i, checkpoint64h, checkpoint64k, checkpoint65, checkpoint64j, checkpoint64m, checkpoint64l, HEAD
Changes since 1.1: +92 -108 lines
Updated to reflect new set-up (idealised channel, was previously using
 lab_sea config); to improve and to complete (missing input_ad description).

1 Seaice-only verification experiment in idealized periodic channel
2 -----------------------------------------------------------------
4 1) main forward experiment (code, input)
6 Re-entrant zonally periodic channel (80x42 grid points) with just level (Nr=1)
7 uniform resolution (5.km, 10m), solid Southern boundary with triangular shape
8 coastline ("bathy_3c.bin")
10 Use seaice (dynamics & thermodynamics from pkg/thsice) with EXF (see data.pkg)
11 with initial ice thickness of 0.2 m (but no snow)
12 (thSIceThick_InitFile='const+20.bin', in "input/data.ice")
13 Initial seaice concentration is 100 % everywhere
14 (thSIceFract_InitFile='const100.bin', in "input/data.ice")
15 and seaice is initially at rest.
17 At runtime turn off time-stepping in 'data', PARM01, using:
18 momStepping = .FALSE.,
19 saltStepping = .FALSE.,
20 tempAdvection=.FALSE.,
21 And just keep surface temp relaxation (tauRelax = 1 month) toward fixed SST:
22 in data.exf :
23 > climsstperiod = 0.0,
24 > climsstTauRelax = 2592000.,
25 > climsstfile = 'tocn.bin',
27 Forcing:
28 None of the forcing vary with time; Most of the input files have been
29 generated using matlab script "input/gendata.m".
30 SST relaxation field is uniform in X, parabolic function of Y with
31 maximum close to Southern boundary.
33 Atmospheric air temp is uniform in Y, and only vary with X (~sin(2.pi.x/Lx))
34 with an amplitude of 4.K ('tair_4x.bin');
35 Uses constant Relative Humidity (70%, file 'qa70_4x.bin')
36 constant and uniform downward shortwave (100.W/m2, 'dsw_100.bin'),
37 downward longwave (250.W/m^2, 'dlw_250.bin'),
38 zonal wind (10.m/s, 'windx.bin'),
39 no meridional wind, no precip.
41 Ocean surface currents comes from a 3 levels ocean-only run (without seaice)
42 using the same wind forcing (uVel_3c0.bin, vVel_3c0.bin) (matlab script:
43 "input/getdata.m")
45 Two matlab scripts ("input/grph_res.m" and "input/grph_diag.m")
46 are provided to make some basic plots (snap-shot and time-averaged
47 diagnostics).
49 2) other (secondary) experiments (using the same executable)
51 a) seaice-dynamics only with LSR solver (input.dyn_lsr/)
52 use same forcing as main forward experiment,
53 ( link input files from "input.dyn_lsr/" dir 1rst, then from "input/" dir )
54 but does not use at all pkg/thsice (advect pkg/seaice properties using
55 pkg/seaice advection S/R.); turn off seaice thermodynamics
56 (usePW79thermodynamics=.FALSE., in input.dyn_lsr/data.seaice).
58 b) seaice-dynamics only with JNFK solver (input.dyn_jfnk/)
59 use same forcing as main forward experiment,
60 ( link input files from "input.dyn_jfnk/" dir 1rst, then from "input/" dir )
61 turn off seaice thermodynamics (thSIce_skipThermo=.TRUE., in file
62 "input.dyn_jfnk/data.ice") and advect pkg/thsice properties using
63 pkg/thsice advection S/R.
65 c) seaice-thermodynamics only from pkg/seaice (input.thermo/)
66 use same forcing as main forward experiment,
67 ( link input files from "input.thermo/" dir 1rst, then from "input/" dir )
68 Except a different bathymetry (no triangular shape coast line in the South,
69 just a simple channel of constant width, with constant and uniform
70 zonal current of 0.2 m/s):
71 in "input.thermo/data":
72 bathyFile = 'channel.bin',
73 uVelInitFile = 'const+20.bin',
74 vVelInitFile = 'const_00.bin',
75 And use different initial seaice concentration from the main forward experiment:
76 (in "input.thermo/data.seaice", AreaFile = 'ice0_area.bin',
77 and HeffFile = 'ice0_heff.bin',)
78 100 % everywhere except in the 1rst and last 2 rows: 0., 10.% in the South
79 and 1.%, 0. in the North:
80 Turn off seaice dynamics (SEAICEuseDYNAMICS =.FALSE., in
81 "input.thermo/data.seaice") which implies no advection (zero ice velocity).
83 d) seaice-thermodynamics only from pkg/thsice (input.thsice/)
84 use same forcing as main forward experiment,
85 ( link input files from "input.thsice/" dir 1rst, then from "input/" dir )
86 Except for bathymetry and initial seaice concentration which are identical
87 to the one used in input.thermo/ :
88 (thSIceFract_InitFile='ice0_area.bin', in "input.thsice/data.ice")
89 No seaice dynamics and no seaice advection, so that none of pkg/seaice S/R
90 are used (useSEAICE = .TRUE., commented out in "input.thsice/data.pkg"),
92 3) main adjoint experiment (code_ad, input_ad)
93 Use similar forward set-up as "input.thermo/".
94 (to be completed ...)

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