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C $Header: /u/gcmpack/MITgcm/pkg/salt_plume/SALT_PLUME.h,v 1.9 2014/04/06 09:34:00 atn Exp $ |
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C $Name: $ |
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#ifdef ALLOW_SALT_PLUME |
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C-- SALT_PLUME parameters |
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C Find surface where the potential density (ref.lev=surface) is |
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C larger than surface density plus SaltPlumeCriterion. |
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C SaltPlumeSouthernOcean: TRUE = apply salt plume globally |
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C FALSE = apply salt plume in Arctic Ocean only |
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LOGICAL SaltPlumeSouthernOcean |
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COMMON /SALT_PLUME_PARAMS_L/ SaltPlumeSouthernOcean |
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C CriterionType: 1=delta_rho, 2=drhodz, default is 1 |
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C PlumeMethod: method of distributing salt plume vertically |
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C 1=power, 2=exp, 3=overshoot, 5=dump_at_top, 6=reverse of 1 |
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C default is 1 |
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C Npower: choices of distributing salt uniformly (0), linear (1), |
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C or higher power (Npower>1); default is 0 when PlumeMethod = 1 |
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INTEGER CriterionType, PlumeMethod, Npower |
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COMMON /SALT_PLUME_PARAMS_I/ CriterionType, PlumeMethod, Npower |
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C SaltPlumeCriterion |
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C for CriterionType=1, default is 0.4 kg/m^3 of Duffy et al 1999 |
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C for CriterionType=2, default is 0.005 kg/m^3/m |
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C SPovershoot: overshooting depth of penetrating salt plume, |
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C so that 1.0 = no-overshoot, 1.2 = 20% overshoot. |
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C default is 1.0 |
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C SPsalFRAC: fraction of the salt by-product of seaice growth (not melt) that |
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C will be re-distributed vertically according to the salt_plume_frac.F |
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C Its default is 1. (for 100% effect), and its range is [0. 1.] |
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C SPinflectionPoint: the inflection point of a nonlinear function |
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C f(AREA) controlling saltPlumeFlux. f(AREA) is a logistic curve |
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C (sigmoid) with range [0. 1.] and f(SPinflectionPoint) == 0.5. |
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C Usage: pkg/salt_plume activates when AREA>=SPinflectionPoint. |
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C To assure only narrow leads generate plumes: |
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C set SPinflectionPoint >= 0.8. |
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C SPalpha :: fraction of grid volume designated to be brine, [0. 1.] |
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C If grid cell 18km x 18km x 10m, take SPalpha=0.001 gives |
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C volume of 0.001*drF(1)*[dx*dy] of brine. Thus SPbrineSalt |
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C can be calc as adding SaltPlumeFlux into this fractional vol. |
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C Default: 0.008 -> SPbrineSalt ~37 if SSS is ~32. |
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_RL SPsalFRAC, SaltPlumeCriterion, SPovershoot |
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#ifdef SALT_PLUME_IN_LEADS |
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_RL SPinflectionPoint |
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#endif |
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COMMON /SALT_PLUME_PARAMS_R/ |
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& SPsalFRAC, SaltPlumeCriterion, SPovershoot |
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#ifdef SALT_PLUME_IN_LEADS |
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& , SPinflectionPoint |
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#endif |
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#ifdef SALT_PLUME_VOLUME |
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& , SPalpha |
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#endif |
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C-- SALT_PLUME 2-dim. fields |
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C SaltPlumeDepth :: depth of penetration of salt plumes |
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C rejected during sea ice growth |
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C saltPlumeFlux :: Net downward salt flux in psu.kg/m^2/s |
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C Note: a) only used when salty sea-ice forms. |
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C b) units: when salinity (unit= psu) is expressed |
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C in g/kg, saltPlumeFlux unit becomes g/m^2/s. |
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C > 0 for increasing in SSS. |
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C Southwest C-grid tracer point |
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C dSPvolSurfDown :: downward volume frac from klev=1 associated w/ saltPlumeFlux |
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C dSPvolfromBelow:: upward volume frac from grid below |
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C dSPvol2Above :: upward volume frac to grid above |
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C SPbrineSalt :: salinity of brine, read in or a function of SPalpha |
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_RL SaltPlumeDepth (1-OLx:sNx+OLx,1-OLy:sNy+OLy,nSx,nSy) |
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_RL saltPlumeFlux (1-OLx:sNx+OLx,1-OLy:sNy+OLy,nSx,nSy) |
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#ifdef SALT_PLUME_VOLUME |
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_RL SPbrineSalt (1-OLx:sNx+OLx,1-OLy:sNy+OLy) |
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_RL dSPvolSurfDown (1-OLx:sNx+OLx,1-OLy:sNy+OLy,Nr) |
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& ,dSPvolfromBelow(1-OLx:sNx+OLx,1-OLy:sNy+OLy,Nr) |
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& ,dSPvol2Above (1-OLx:sNx+OLx,1-OLy:sNy+OLy,Nr+1) |
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#endif |
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COMMON /DYNVARS_SALT_PLUME/ SaltPlumeDepth |
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COMMON /FFIELDS_saltPlumeFlux/ saltPlumeFlux |
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COMMON /FFIELDS_SaltPlumeVol/ |
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& SPbrineSalt,dSPvolSurfDown,dSPvolfromBelow,dSPvol2Above |
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#endif /* ALLOW_SALT_PLUME */ |
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