| 1 | SUBROUTINE SUGWD(nlayer,sigtest) |
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| 2 | ! ============================================================================== |
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| 3 | ! Initialize common variables in yoegwd.h to control the orographic |
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| 4 | ! gravity wave drag parameterization. That means, all the tunable parameters |
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| 5 | ! for oro-GW scheme are in this subroutine. |
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| 6 | ! MARTIN MILLER *ECMWF* ORIGINAL : 90-01-01 |
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| 7 | ! Update: Jiandong Liu 2022/03/15 Rewirite into .F90 and |
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| 8 | ! comment. |
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| 9 | ! REFERENCE. |
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| 10 | ! ---------- |
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| 11 | ! ECMWF Research Department documentation of the IFS |
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| 12 | !=============================================================================== |
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| 13 | |
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| 14 | USE yoegwd_h, ONLY: GFRCRIT, GRCRIT, GVCRIT |
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| 15 | USE yoegwd_h, ONLY: GKDRAG, GKDRAGL, GHMAX |
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| 16 | USE yoegwd_h, ONLY: GRAHILO, GSIGCR, GSSEC |
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| 17 | USE yoegwd_h, ONLY: GTSEC, GVSEC, GKWAKE |
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| 18 | USE yoegwd_h, ONLY: NKTOPG |
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| 19 | |
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| 20 | implicit none |
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| 21 | |
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| 22 | ! 0.1 Inputs: |
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| 23 | integer,intent(in):: nlayer ! Number of model levels |
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| 24 | REAL,intent(in):: sigtest(nlayer+1) ! Vertical coordinate table |
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| 25 | |
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| 26 | ! 0.2 Outputs: |
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| 27 | ! None. |
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| 28 | |
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| 29 | ! 0.3 Local variables |
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| 30 | real zsigt ! Top of the sigma coordinates? |
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| 31 | real zpr ! Reference pressure ? |
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| 32 | real zpm1r ! Pressure at full layer ? |
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| 33 | integer jk |
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| 34 | |
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| 35 | !------------------------------------------------------------------------------- |
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| 36 | ! 1. Set the values of the parameters |
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| 37 | !------------------------------------------------------------------------------- |
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| 38 | ! PRINT *,' Dans sugwd nlayer=',nlayer,' SIG=',sigtest |
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| 39 | GHMAX=10000. |
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| 40 | |
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| 41 | ! old ZSIGT=0.94 |
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| 42 | ! old ZPR=80000. |
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| 43 | ZSIGT=0.85 ! Sigmal levels |
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| 44 | ZPR=100000. ! Surface (Reference) Pressure? |
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| 45 | |
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| 46 | ! ! Condition to find NKTOPG layer, which NKTOPG is a condition to set |
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| 47 | ! 1*pvar and 2*pvar layers (OROSETUP) |
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| 48 | DO JK=1,nlayer-1 |
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| 49 | ZPM1R=0.5*ZPR*(sigtest(JK)+sigtest(JK+1)) |
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| 50 | IF((ZPM1R/ZPR).GE.ZSIGT)THEN |
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| 51 | NKTOPG=JK |
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| 52 | ENDIF |
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| 53 | ENDDO |
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| 54 | WRITE(*,*) 'In sugwd NKTOPG=',NKTOPG |
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| 55 | |
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| 56 | GSIGCR=0.80 ! Sigmal levels to found the top of low level flow height (OROSETUP) |
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| 57 | GKDRAG= 0.1 ! used to be 0.1 for mcd Version 1 and 2 (before 10/2000) (OROSETUP) |
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| 58 | |
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| 59 | GFRCRIT=1.0 |
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| 60 | GKWAKE=1.0 ! The G in equation (16) |
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| 61 | GRCRIT=0.25 ! Critical value for Mean flow richardson number(OROSETUP) |
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| 62 | GKDRAGL=4.*GKDRAG |
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| 63 | GRAHILO=1. |
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| 64 | GVCRIT =0.0 |
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| 65 | !------------------------------------------------------------------------------- |
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| 66 | ! 2. Set values of security parameters |
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| 67 | !------------------------------------------------------------------------------- |
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| 68 | GVSEC=0.10 ! Security values for For normal wind (pu^2+pv^2)^0.5(OROSETUP,GWSTRESS) |
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| 69 | GSSEC=1.E-12 ! Security values for Brunt–Väisälä frequency N^2 (OROSETUP) |
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| 70 | GTSEC=1.E-07 ! Security values for Sub-grid scale anisotropy(OROSETUP,GWSTRESS) |
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| 71 | |
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| 72 | RETURN |
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| 73 | END |
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