| 1 | ! |
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| 2 | ! $Header$ |
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| 3 | ! |
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| 4 | MODULE icefrac_lsc_mod |
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| 5 | |
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| 6 | IMPLICIT NONE |
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| 7 | |
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| 8 | CONTAINS |
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| 9 | !******************************************************************* |
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| 10 | |
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| 11 | SUBROUTINE icefrac_lsc(np,temp, sig, icefrac) |
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| 12 | ! |
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| 13 | ! Compute the ice fraction 1-xliq (see e.g. |
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| 14 | ! Doutriaux-Boucher & Quaas 2004, section 2.2.) |
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| 15 | ! |
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| 16 | ! (JBM 3/14 8/14 5/16) |
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| 17 | |
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| 18 | USE print_control_mod, ONLY: lunout, prt_level |
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| 19 | INCLUDE "nuage.h" |
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| 20 | |
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| 21 | ! nuage.h contains: |
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| 22 | ! t_glace_min: if T < Tmin, the cloud is only made of water ice |
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| 23 | ! t_glace_max: if T > Tmax, the cloud is only made of liquid water |
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| 24 | ! exposant_glace: controls the sharpness of the transition |
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| 25 | INTEGER :: np |
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| 26 | REAL, DIMENSION(np), INTENT(IN) :: temp ! temperature |
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| 27 | REAL, DIMENSION(np), INTENT(IN) :: sig |
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| 28 | REAL, DIMENSION(np), INTENT(OUT) :: icefrac |
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| 29 | |
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| 30 | REAL :: sig0,www,tmin_tmp,liqfrac_tmp |
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| 31 | INTEGER :: ip |
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| 32 | |
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| 33 | sig0=0.8 |
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| 34 | |
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| 35 | DO ip=1,np |
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| 36 | IF (iflag_t_glace.EQ.1) THEN |
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| 37 | ! Transition to ice close to surface for T<Tmax |
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| 38 | ! w=1 at the surface and 0 for sig < sig0 |
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| 39 | www=(max(sig(ip)-sig0,0.))/(1.-sig0) |
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| 40 | ELSEIF (iflag_t_glace.GE.2) THEN |
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| 41 | ! No convertion to ice close to surface |
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| 42 | www = 0. |
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| 43 | ENDIF |
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| 44 | tmin_tmp=www*t_glace_max+(1.-www)*t_glace_min |
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| 45 | liqfrac_tmp= (temp(ip)-tmin_tmp) / (t_glace_max-tmin_tmp) |
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| 46 | liqfrac_tmp = MIN(MAX(liqfrac_tmp,0.0),1.0) |
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| 47 | IF (iflag_t_glace.GE.3) THEN |
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| 48 | icefrac(ip) = 1.0-liqfrac_tmp**exposant_glace |
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| 49 | ELSE |
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| 50 | icefrac(ip) = (1.0-liqfrac_tmp)**exposant_glace |
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| 51 | ENDIF |
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| 52 | ENDDO |
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| 53 | |
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| 54 | RETURN |
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| 55 | END SUBROUTINE icefrac_lsc |
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| 56 | |
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| 57 | !******************************************************************* |
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| 58 | ! |
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| 59 | END MODULE icefrac_lsc_mod |
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