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c $Header: /u/gcmpack/MITgcm/pkg/exf/exf_constants.h,v 1.8 2006/06/05 14:56:59 heimbach Exp $ |
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c |
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c |
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c ================================================================== |
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c HEADER exf_constants |
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c ================================================================== |
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c |
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c o Header file for constants. |
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c These include - numbers (e.g. 1, 2, 1/2, ...) |
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c - physical constants (e.g. gravitational const.) |
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c - empirical parameters |
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c - control parameters (e.g. max. no of iteration) |
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c |
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c started: Patrick Heimbach heimbach@mit.edu 06-May-2000 |
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c mods for pkg/seaice: menemenlis@jpl.nasa.gov 20-Dec-2002 |
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c |
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c ================================================================== |
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c HEADER exf_constants |
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c ================================================================== |
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|
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c 1. numbers |
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|
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c exf_half 0.5 |
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c exf_one 1.0 |
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c exf_two 2.0 |
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|
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_RL exf_half |
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_RL exf_one |
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_RL exf_two |
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|
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parameter( |
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& exf_half = 0.5d0 , |
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& exf_one = 1.0d0 , |
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& exf_two = 2.0d0 |
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& ) |
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|
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real exf_undef |
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parameter( exf_undef = -9000. ) |
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|
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c 2. physical constants |
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|
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c Stefan-Boltzmann constant [J*K^-4*m^-2s^-1] |
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c sigma = (2*pi^5*k^4)/(15*h^3*c^2) |
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_RL stefanBoltzmann |
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parameter ( stefanBoltzmann = 5.670D-8 ) |
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|
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#ifdef ALLOW_ATM_TEMP |
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c is identical to "gravity" used in MITgcmUV |
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c needs to be marmonized through common constants.h file |
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_RL gravity_mks |
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parameter ( gravity_mks = 9.81d0 ) |
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#endif |
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|
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c 3. empirical parameters |
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|
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c umin - minimum absolute wind speed used to evaluate |
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c drag coefficient [m/s] |
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c atmrho - mean atmospheric density [kg/(m*3)] |
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_RL umin |
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_RL atmrho |
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parameter ( umin = 0.5 _d 0 |
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& , atmrho = 1.200 d0 ) |
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|
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c To invert the relationship ustar = ustar(umagn) the following |
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c parameterization is used: |
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c |
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c ustar**2 = umagn**2 * CDN(umagn) |
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c |
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c / cquadrag_1 * umagn**2 + cquadrag_2; 0 < u < 11 m/s |
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c CDN(umagn) = |
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c \ clindrag_1 * umagn + clindrag_2 ; u > 11 m/s |
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c |
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c clindrag_[n] - n = 1, 2 coefficients used to evaluate |
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c LINEAR relationship of Large and Pond 1981 |
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c cquadrag_[n] - n = 1, 2 coefficients used to evaluate |
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c quadratic relationship |
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c u11 - u = 11 m/s wind speed |
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c ustofu11 - ustar = 0.3818 m/s, corresponding to u = 11 m/s |
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|
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_RL clindrag_1, clindrag_2 |
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_RL cquadrag_1, cquadrag_2 |
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_RL u11 |
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_RL ustofu11 |
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|
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parameter ( |
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& ustofu11 = 0.381800d0 , |
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& u11 = 11. d0 , |
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& clindrag_1 = 0.000065d0 , |
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& clindrag_2 = 0.000490d0 , |
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& cquadrag_1 = clindrag_1/u11/2 , |
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& cquadrag_2 = clindrag_1*u11/2 + clindrag_2 |
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& ) |
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|
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#ifdef ALLOW_BULKFORMULAE |
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|
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c atmcp - mean atmospheric specific heat [J/kg/deg K] |
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c flamb - latent heat of evaporation [J/kg] |
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C flami - latent heat of melting of pure ice [J/kg] |
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c cdrag_[n] - n = 1,2,3 coefficients used to evaluate |
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c drag coefficient |
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c cstanton_[n] - n = 1,2 coefficients used to evaluate |
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c the Stanton number (stable/unstable cond.) |
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c dalton - coefficient used to evaluate the Dalton number |
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c zolmin - minimum stability parameter |
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c zref - reference height |
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c |
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c karman - von Karman constant |
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c cvapor - see e.g. Gill (1982) p.41 Eq. (3.1.15) |
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c humid_fac - constant entering the evaluation of the virtual |
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c temperature |
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c gamma_blk - adiabatic lapse rate |
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c saltsat - reduction of saturation vapor pressure over salt water |
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c psim_fac - |
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c cen2kel - conversion of deg. Centigrade to Kelvin |
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c hu - height of mean wind |
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c ht - height of mean temperature |
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c hq - height of mean rel. humidity |
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|
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_RL atmcp |
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_RL flamb, flami |
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_RL cdrag_1, cdrag_2, cdrag_3 |
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_RL cstanton_1, cstanton_2 |
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_RL cdalton |
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_RL zolmin |
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_RL zref |
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_RL karman |
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_RL cvapor_fac, cvapor_exp |
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_RL cvapor_fac_ice, cvapor_exp_ice |
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_RL humid_fac |
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_RL gamma_blk |
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_RL saltsat |
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_RL psim_fac |
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_RL cen2kel |
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_RL hu |
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_RL ht |
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_RL hq |
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|
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parameter ( cdrag_1 = 0.0027000d0 , |
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& cdrag_2 = 0.0001420d0 , |
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& cdrag_3 = 0.0000764d0 , |
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& cstanton_1 = 0.0327000d0 , |
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& cstanton_2 = 0.0180000d0 , |
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& cdalton = 0.0346000d0 , |
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& atmcp = 1005.000 d0 , |
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& flamb = 2500000.000 d0 , |
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& flami = 334000.000 d0 , |
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& zolmin = -100.000 d0 , |
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& zref = 10.000 d0 , |
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& karman = 0.400 d0 , |
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& cvapor_fac = 640380.000 d0 , |
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& cvapor_exp = 5107.400 d0 , |
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& cvapor_fac_ice = 11637800.000 d0 , |
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& cvapor_exp_ice = 5897.800 d0 , |
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& humid_fac = 0.606 d0 , |
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& gamma_blk = 0.010 d0 , |
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& saltsat = 0.980 d0 , |
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& psim_fac = 5.000 d0 , |
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& cen2kel = 273.150 d0 , |
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& hu = 10.000 d0 , |
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& ht = 2.000 d0 , |
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& hq = 2.000 d0 |
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& ) |
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|
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#ifdef ALLOW_ATM_TEMP |
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_RL czol |
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parameter ( czol = hu*karman*gravity_mks ) |
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#endif |
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|
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c 4. control parameters |
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|
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c niter_bulk - Number of iterations to be performed for the |
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c evaluation of the bulk surface fluxes. The ncom |
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c model uses 2 hardwired interation steps (loop |
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c unrolled). |
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c |
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integer niter_bulk |
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parameter ( niter_bulk = 2 ) |
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|
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#endif /* ALLOW_BULKFORMULAE */ |
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