| 1 |
C $Header: /u/gcmpack/MITgcm/pkg/exf/EXF_CONSTANTS.h,v 1.4 2007/05/08 03:48:08 jmc Exp $ |
| 2 |
C $Name: $ |
| 3 |
c |
| 4 |
c |
| 5 |
c ================================================================== |
| 6 |
c HEADER exf_constants |
| 7 |
c ================================================================== |
| 8 |
c |
| 9 |
c o Header file for constants. |
| 10 |
c These include - numbers (e.g. 1, 2, 1/2, ...) |
| 11 |
c - physical constants (e.g. gravitational const.) |
| 12 |
c - empirical parameters |
| 13 |
c - control parameters (e.g. max. no of iteration) |
| 14 |
c |
| 15 |
c started: Patrick Heimbach heimbach@mit.edu 06-May-2000 |
| 16 |
c mods for pkg/seaice: menemenlis@jpl.nasa.gov 20-Dec-2002 |
| 17 |
c |
| 18 |
c ================================================================== |
| 19 |
c HEADER exf_constants |
| 20 |
c ================================================================== |
| 21 |
|
| 22 |
c 1. numbers |
| 23 |
|
| 24 |
c exf_half 0.5 |
| 25 |
c exf_one 1.0 |
| 26 |
c exf_two 2.0 |
| 27 |
|
| 28 |
_RL exf_half |
| 29 |
_RL exf_one |
| 30 |
_RL exf_two |
| 31 |
|
| 32 |
PARAMETER( |
| 33 |
& exf_half = 0.5 _d 0 , |
| 34 |
& exf_one = 1.0 _d 0 , |
| 35 |
& exf_two = 2.0 _d 0 |
| 36 |
& ) |
| 37 |
|
| 38 |
c real exf_undef |
| 39 |
c PARAMETER( exf_undef = -9000. ) |
| 40 |
|
| 41 |
c 2. physical constants |
| 42 |
|
| 43 |
c stefanBoltzmann :: Stefan-Boltzmann constant [J*K^-4*m^-2*s^-1] |
| 44 |
c sigma = (2*pi^5*k^4)/(15*h^3*c^2) |
| 45 |
c karman :: von Karman constant |
| 46 |
_RL stefanBoltzmann |
| 47 |
_RL karman |
| 48 |
PARAMETER ( stefanBoltzmann = 5.670 _d -8 ) |
| 49 |
PARAMETER ( karman = 0.4 _d 0 ) |
| 50 |
|
| 51 |
c 3. empirical parameters |
| 52 |
|
| 53 |
c To invert the relationship ustar = ustar(umagn) the following |
| 54 |
c parameterization is used: |
| 55 |
c |
| 56 |
c ustar**2 = umagn**2 * CDN(umagn) |
| 57 |
c |
| 58 |
c / cquadrag_1 * umagn**2 + cquadrag_2; 0 < u < 11 m/s |
| 59 |
c CDN(umagn) = |
| 60 |
c \ clindrag_1 * umagn + clindrag_2 ; u > 11 m/s |
| 61 |
c |
| 62 |
c clindrag_[n] - n = 1, 2 coefficients used to evaluate |
| 63 |
c LINEAR relationship of Large and Pond 1981 |
| 64 |
c cquadrag_[n] - n = 1, 2 coefficients used to evaluate |
| 65 |
c quadratic relationship |
| 66 |
c u11 - u = 11 m/s wind speed |
| 67 |
c ustofu11 - ustar = 0.3818 m/s, corresponding to u = 11 m/s |
| 68 |
|
| 69 |
_RL clindrag_1, clindrag_2 |
| 70 |
_RL cquadrag_1, cquadrag_2 |
| 71 |
_RL u11 |
| 72 |
_RL ustofu11 |
| 73 |
|
| 74 |
PARAMETER ( |
| 75 |
& ustofu11 = 0.381800 _d 0 , |
| 76 |
& u11 = 11. _d 0 , |
| 77 |
& clindrag_1 = 0.000065 _d 0 , |
| 78 |
& clindrag_2 = 0.000490 _d 0 , |
| 79 |
& cquadrag_1 = clindrag_1/u11/2 , |
| 80 |
& cquadrag_2 = clindrag_1*u11/2 + clindrag_2 |
| 81 |
& ) |
| 82 |
|
| 83 |
c 4. control parameters |
| 84 |
|
| 85 |
c niter_bulk - Number of iterations to be performed for the |
| 86 |
c evaluation of the bulk surface fluxes. The ncom |
| 87 |
c model uses 2 hardwired interation steps (loop |
| 88 |
c unrolled). |
| 89 |
c |
| 90 |
INTEGER niter_bulk |
| 91 |
PARAMETER ( niter_bulk = 2 ) |
| 92 |
|
| 93 |
C 5. other constants or parameters |
| 94 |
|
| 95 |
C COMMON /EXF_PARAM_R_2/ |
| 96 |
C cen2kel :: conversion of deg. Centigrade to Kelvin |
| 97 |
C gravity_mks :: gravitational acceleration [m/s^2] |
| 98 |
C atmrho :: mean atmospheric density [kg/m^3] |
| 99 |
C atmcp :: mean atmospheric specific heat [J/kg/K] |
| 100 |
C flamb :: latent heat of evaporation [J/kg] |
| 101 |
C flami :: latent heat of melting of pure ice [J/kg] |
| 102 |
C cvapor_[] :: Coeff to calculate Saturation Specific Humidity |
| 103 |
C see e.g. Gill (1982) p.41 Eq. (3.1.15) |
| 104 |
C humid_fac :: constant entering the evaluation of the virtual |
| 105 |
C temperature |
| 106 |
C gamma_blk :: adiabatic lapse rate |
| 107 |
C saltsat :: reduction of saturation vapor pressure over salt water |
| 108 |
C sstExtrapol :: extrapolation coeff from 1rst 2 levels up to surface |
| 109 |
C snow_emissivity :: longwave snow emissivity [-] (with pkg thsice/seaice) |
| 110 |
C-- to evaluate turbulent transfert coefficients: |
| 111 |
C cdrag_[n] :: n = 1,2,3 coefficients used to evaluate |
| 112 |
C drag coefficient |
| 113 |
C cstanton_[n] :: n = 1,2 coefficients used to evaluate |
| 114 |
C the Stanton number (stable/unstable cond.) |
| 115 |
C cdalton :: coefficient used to evaluate the Dalton number |
| 116 |
C zolmin :: minimum stability parameter |
| 117 |
C psim_fac :: coef used in turbulent fluxes calculation [-] |
| 118 |
C zref :: reference height |
| 119 |
C hu :: height of mean wind |
| 120 |
C ht :: height of mean temperature |
| 121 |
C hq :: height of mean rel. humidity |
| 122 |
C umin :: minimum absolute wind speed used to evaluate |
| 123 |
C drag coefficient [m/s] |
| 124 |
C exf_iceCd :: drag coefficient over sea-ice (fixed) |
| 125 |
C exf_iceCe :: transfert coeff. over sea-ice, for Evaporation (fixed) |
| 126 |
C exf_iceCh :: transfert coeff. over sea-ice, for Sens.Heating (fixed) |
| 127 |
C-- radiation: |
| 128 |
C exf_albedo :: Sea-water albedo |
| 129 |
C ocean_emissivity :: longwave ocean-surface emissivity [-] |
| 130 |
C ice_emissivity :: longwave seaice emissivity [-] (with pkg thsice/seaice) |
| 131 |
C snow_emissivity :: longwave snow emissivity [-] (with pkg thsice/seaice) |
| 132 |
|
| 133 |
_RL cen2kel |
| 134 |
_RL gravity_mks |
| 135 |
_RL atmrho |
| 136 |
_RL atmcp |
| 137 |
_RL flamb, flami |
| 138 |
_RL cvapor_fac, cvapor_exp |
| 139 |
_RL cvapor_fac_ice, cvapor_exp_ice |
| 140 |
_RL humid_fac |
| 141 |
_RL gamma_blk |
| 142 |
_RL saltsat |
| 143 |
_RL sstExtrapol |
| 144 |
_RL cdrag_1, cdrag_2, cdrag_3 |
| 145 |
_RL cstanton_1, cstanton_2 |
| 146 |
_RL cdalton |
| 147 |
_RL zolmin |
| 148 |
_RL psim_fac |
| 149 |
_RL zref |
| 150 |
_RL hu |
| 151 |
_RL ht |
| 152 |
_RL hq |
| 153 |
_RL umin |
| 154 |
_RL exf_iceCd |
| 155 |
_RL exf_iceCe |
| 156 |
_RL exf_iceCh |
| 157 |
_RL exf_albedo |
| 158 |
_RL ocean_emissivity |
| 159 |
_RL ice_emissivity |
| 160 |
_RL snow_emissivity |
| 161 |
|
| 162 |
COMMON /EXF_PARAM_R_2/ |
| 163 |
& cen2kel, |
| 164 |
& gravity_mks, |
| 165 |
& atmrho, |
| 166 |
& atmcp, |
| 167 |
& flamb, |
| 168 |
& flami, |
| 169 |
& cvapor_fac, cvapor_exp, |
| 170 |
& cvapor_fac_ice, cvapor_exp_ice, |
| 171 |
& humid_fac, |
| 172 |
& gamma_blk, |
| 173 |
& saltsat, |
| 174 |
& sstExtrapol, |
| 175 |
& cdrag_1, cdrag_2, cdrag_3, |
| 176 |
& cstanton_1, cstanton_2, |
| 177 |
& cdalton, |
| 178 |
& zolmin, |
| 179 |
& psim_fac, |
| 180 |
& zref, |
| 181 |
& hu, |
| 182 |
& ht, |
| 183 |
& hq, |
| 184 |
& umin, |
| 185 |
& exf_iceCd, exf_iceCe, exf_iceCh, |
| 186 |
& exf_albedo, |
| 187 |
& ocean_emissivity, |
| 188 |
& ice_emissivity, |
| 189 |
& snow_emissivity |
| 190 |
|
Parent Directory
| 
Revision Log
| 
Revision Graph