| 1 | SUBROUTINE pbl_parameters(ngrid,nlay,ps,pplay,pz0, |
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| 2 | & pg,zzlay,zzlev,pu,pv,wstar_in,hfmax,zmax,pts,ph,z_out,n_out, |
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| 3 | & T_out,u_out,ustar,tstar,L_mo,vhf,vvv) |
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| 4 | USE comcstfi_h |
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| 5 | IMPLICIT NONE |
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| 6 | !======================================================================= |
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| 7 | ! |
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| 8 | ! Anlysis of the PBL from input temperature, wind field and thermals outputs. |
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| 9 | ! |
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| 10 | ! ------- |
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| 11 | ! |
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| 12 | ! Author: Arnaud Colaitis 09/01/12 |
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| 13 | ! ------- |
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| 14 | ! |
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| 15 | ! Arguments: |
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| 16 | ! ---------- |
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| 17 | ! |
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| 18 | ! inputs: |
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| 19 | ! ------ |
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| 20 | ! ngrid size of the horizontal grid |
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| 21 | ! nlay size of the vertical grid |
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| 22 | ! pz0(ngrid) surface roughness length |
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| 23 | ! pg gravity (m s -2) |
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| 24 | ! zzlay(ngrid,nlay) height of mid-layers |
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| 25 | ! zzlev(ngrid,nlay+1) height of layers interfaces |
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| 26 | ! pu(ngrid,nlay) u component of the wind |
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| 27 | ! pv(ngrid,nlay) v component of the wind |
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| 28 | ! wstar_in(ngrid) free convection velocity in PBL |
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| 29 | ! hfmax(ngrid) maximum vertical turbulent heat flux in thermals |
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| 30 | ! zmax(ngrid) height reached by the thermals (pbl height) |
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| 31 | ! pts(ngrid) surface temperature |
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| 32 | ! ph(ngrid,nlay) potential temperature T*(p/ps)^kappa |
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| 33 | ! z_out(n_out) heights of interpolation |
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| 34 | ! n_out number of points for interpolation |
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| 35 | ! |
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| 36 | ! outputs: |
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| 37 | ! ------ |
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| 38 | ! |
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| 39 | ! Teta_out(ngrid,n_out) interpolated teta |
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| 40 | ! u_out(ngrid,n_out) interpolated u |
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| 41 | ! ustar(ngrid) friction velocity |
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| 42 | ! tstar(ngrid) friction temperature |
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| 43 | ! L_mo(ngrid) monin_obukhov length |
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| 44 | ! |
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| 45 | ! |
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| 46 | !======================================================================= |
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| 47 | ! |
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| 48 | !----------------------------------------------------------------------- |
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| 49 | ! Declarations: |
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| 50 | ! ------------- |
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| 51 | |
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| 52 | #include "callkeys.h" |
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| 53 | |
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| 54 | ! Arguments: |
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| 55 | ! ---------- |
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| 56 | |
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| 57 | INTEGER, INTENT(IN) :: ngrid,nlay,n_out |
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| 58 | REAL, INTENT(IN) :: pz0(ngrid),ps(ngrid),pplay(ngrid,nlay) |
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| 59 | REAL, INTENT(IN) :: pg,zzlay(ngrid,nlay),zzlev(ngrid,nlay) |
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| 60 | REAL, INTENT(IN) :: pu(ngrid,nlay),pv(ngrid,nlay) |
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| 61 | REAL, INTENT(IN) :: wstar_in(ngrid),hfmax(ngrid),zmax(ngrid) |
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| 62 | REAL, INTENT(IN) :: pts(ngrid),ph(ngrid,nlay) |
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| 63 | REAL, INTENT(IN) :: z_out(n_out) |
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| 64 | |
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| 65 | ! Outputs: |
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| 66 | ! -------- |
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| 67 | |
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| 68 | REAL, INTENT(OUT) :: T_out(ngrid,n_out),u_out(ngrid,n_out) |
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| 69 | REAL Teta_out(ngrid,n_out) |
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| 70 | REAL, INTENT(OUT) :: ustar(ngrid), tstar(ngrid) |
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| 71 | REAL, INTENT(OUT) :: L_mo(ngrid) |
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| 72 | |
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| 73 | ! Local: |
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| 74 | ! ------ |
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| 75 | |
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| 76 | INTEGER ig,k,n |
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| 77 | REAL karman,nu |
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| 78 | DATA karman,nu/.41,0.001/ |
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| 79 | SAVE karman,nu |
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| 80 | |
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| 81 | ! Local(2): |
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| 82 | ! --------- |
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| 83 | |
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| 84 | REAL zout |
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| 85 | REAL rib(ngrid) ! Bulk Richardson number |
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| 86 | REAL fm(ngrid) ! stability function for momentum |
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| 87 | REAL fh(ngrid) ! stability function for heat |
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| 88 | REAL z1z0,z1z0t ! ratios z1/z0 and z1/z0T |
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| 89 | ! phim = 1+betam*zeta or (1-bm*zeta)**am |
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| 90 | ! phih = alphah + betah*zeta or alphah(1.-bh*zeta)**ah |
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| 91 | REAL betam, betah, alphah, bm, bh, lambda |
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| 92 | ! ah and am are assumed to be -0.25 and -0.5 respectively |
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| 93 | REAL cdn(ngrid),chn(ngrid) ! neutral momentum and heat drag coefficient |
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| 94 | REAL pz0t ! initial thermal roughness length. (local) |
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| 95 | REAL ric ! critical richardson number |
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| 96 | REAL reynolds(ngrid) ! reynolds number for UBL |
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| 97 | REAL prandtl(ngrid) ! prandtl number for UBL |
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| 98 | REAL pz0tcomp(ngrid) ! computed z0t |
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| 99 | REAL ite |
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| 100 | REAL residual,zcd0,z1 |
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| 101 | REAL pcdv(ngrid),pcdh(ngrid) |
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| 102 | REAL zu2(ngrid) ! Large-scale wind at first layer |
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| 103 | REAL pbl_teta(ngrid) ! mixed-layer potential temperature |
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| 104 | INTEGER pbl_height_index(ngrid) ! index of nearest vertical grid point for zmax |
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| 105 | REAL dteta(ngrid,nlay),x(ngrid) ! potential temperature gradient and z/zi |
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| 106 | REAL dvhf(ngrid),dvvv(ngrid) ! dimensionless vertical heat flux and |
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| 107 | ! dimensionless vertical velocity variance |
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| 108 | REAL vhf(ngrid),vvv(ngrid) ! vertical heat flux and vertical velocity variance |
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| 109 | INTEGER ii(1) |
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| 110 | ! temporary |
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| 111 | INTEGER dimout |
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| 112 | |
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| 113 | !------------------------------------------------------------------------ |
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| 114 | !------------------------------------------------------------------------ |
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| 115 | ! PART I : RICHARDSON/REYNOLDS/THERMAL_ROUGHNESS/STABILITY_COEFFICIENTS |
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| 116 | !------------------------------------------------------------------------ |
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| 117 | !------------------------------------------------------------------------ |
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| 118 | |
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| 119 | DO n=1,n_out |
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| 120 | |
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| 121 | c Initialisation : |
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| 122 | |
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| 123 | L_mo(:)=0. |
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| 124 | ustar(:)=0. |
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| 125 | tstar(:)=0. |
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| 126 | zout=z_out(n) |
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| 127 | reynolds(:)=0. |
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| 128 | pz0t = 0. |
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| 129 | pz0tcomp(:) = 0.1*pz0(:) |
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| 130 | rib(:)=0. |
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| 131 | pcdv(:)=0. |
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| 132 | pcdh(:)=0. |
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| 133 | |
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| 134 | ! this formulation assumes alphah=1., implying betah=betam |
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| 135 | ! We use Dyer et al. parameters, as they cover a broad range of Richardson numbers : |
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| 136 | |
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| 137 | bm=16. !UBL |
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| 138 | bh=16. !UBL |
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| 139 | alphah=1. |
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| 140 | betam=5. !SBL |
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| 141 | betah=5. !SBL |
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| 142 | lambda=(sqrt(bh/bm))/alphah |
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| 143 | ric=betah/(betam**2) |
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| 144 | DO ig=1,ngrid |
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| 145 | ite=0. |
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| 146 | residual=abs(pz0tcomp(ig)-pz0t) |
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| 147 | |
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| 148 | zu2(ig)=pu(ig,1)*pu(ig,1)+pv(ig,1)*pv(ig,1) |
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| 149 | & + (log(1.+0.7*wstar_in(ig) + 2.3*wstar_in(ig)**2))**2 |
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| 150 | |
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| 151 | DO WHILE((residual .gt. 0.01*pz0(ig)) .and. (ite .lt. 10.)) |
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| 152 | |
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| 153 | pz0t=pz0tcomp(ig) |
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| 154 | IF (zu2(ig) .ne. 0.) THEN |
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| 155 | ! Richardson number formulation proposed by D.E. England et al. (1995) |
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| 156 | rib(ig) = (pg/pts(ig)) |
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| 157 | & *sqrt(zzlay(ig,1)*pz0(ig)) |
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| 158 | & *(((log(zzlay(ig,1)/pz0(ig)))**2)/(log(zzlay(ig,1)/pz0t))) |
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| 159 | & *(ph(ig,1)-pts(ig))/(pu(ig,1)*pu(ig,1)+pv(ig,1)*pv(ig,1)) |
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| 160 | ELSE |
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| 161 | print*,'warning, infinite Richardson at surface' |
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| 162 | print*,pu(ig,1),pv(ig,1) |
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| 163 | rib(ig) = ric |
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| 164 | ENDIF |
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| 165 | |
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| 166 | z1z0=zzlay(ig,1)/pz0(ig) |
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| 167 | z1z0t=zzlay(ig,1)/pz0t |
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| 168 | |
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| 169 | cdn(ig)=karman/log(z1z0) |
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| 170 | cdn(ig)=cdn(ig)*cdn(ig) |
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| 171 | chn(ig)=cdn(ig)*log(z1z0)/log(z1z0t) |
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| 172 | |
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| 173 | ! STABLE BOUNDARY LAYER : |
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| 174 | IF (rib(ig) .gt. 0.) THEN |
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| 175 | ! From D.E. England et al. (95) |
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| 176 | prandtl(ig)=1. |
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| 177 | if(rib(ig) .lt. ric) then |
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| 178 | ! Assuming alphah=1. and bh=bm for stable conditions : |
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| 179 | fm(ig)=((ric-rib(ig))/ric)**2 |
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| 180 | fh(ig)=((ric-rib(ig))/ric)**2 |
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| 181 | else |
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| 182 | ! For Ri>Ric, we consider Ri->Infinity => no turbulent mixing at surface |
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| 183 | fm(ig)=0. |
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| 184 | fh(ig)=0. |
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| 185 | endif |
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| 186 | ! UNSTABLE BOUNDARY LAYER : |
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| 187 | ELSE |
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| 188 | ! From D.E. England et al. (95) |
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| 189 | fm(ig)=sqrt(1.-lambda*bm*rib(ig)) |
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| 190 | fh(ig)=(1./alphah)*((1.-lambda*bh*rib(ig))**0.5)* |
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| 191 | & (1.-lambda*bm*rib(ig))**0.25 |
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| 192 | prandtl(ig)=alphah*((1.-lambda*bm*rib(ig))**0.25)/ |
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| 193 | & ((1.-lambda*bh*rib(ig))**0.5) |
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| 194 | ENDIF |
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| 195 | |
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| 196 | reynolds(ig)=karman*sqrt(fm(ig)) |
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| 197 | & *sqrt(zu2(ig)) |
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| 198 | & *pz0(ig)/(log(z1z0)*nu) |
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| 199 | pz0tcomp(ig)=pz0(ig)*exp(-karman*7.3* |
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| 200 | & (reynolds(ig)**0.25)*(prandtl(ig)**0.5)) |
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| 201 | residual = abs(pz0t-pz0tcomp(ig)) |
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| 202 | ite = ite+1 |
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| 203 | |
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| 204 | ENDDO ! of while |
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| 205 | pz0t=0. |
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| 206 | |
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| 207 | ! Drag computation: |
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| 208 | |
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| 209 | pcdv(ig)=cdn(ig)*fm(ig) |
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| 210 | pcdh(ig)=chn(ig)*fh(ig) |
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| 211 | |
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| 212 | ENDDO ! of ngrid |
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| 213 | |
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| 214 | !------------------------------------------------------------------------ |
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| 215 | !------------------------------------------------------------------------ |
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| 216 | ! PART II : USTAR/TSTAR/U_OUT/TETA_OUT COMPUTATIONS |
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| 217 | !------------------------------------------------------------------------ |
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| 218 | !------------------------------------------------------------------------ |
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| 219 | |
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| 220 | |
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| 221 | ! u* theta* computation: |
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| 222 | |
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| 223 | DO ig=1,ngrid |
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| 224 | IF (rib(ig) .ge. ric) THEN |
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| 225 | ustar(ig)=0. |
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| 226 | tstar(ig)=0. |
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| 227 | |
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| 228 | ELSE |
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| 229 | ustar(ig)=sqrt(pcdv(ig)) |
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| 230 | & *sqrt(pu(ig,1)*pu(ig,1)+pv(ig,1)*pv(ig,1)) |
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| 231 | tstar(ig)=-pcdh(ig)*(pts(ig)-ph(ig,1)) |
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| 232 | & /sqrt(pcdv(ig)) |
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| 233 | |
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| 234 | ENDIF |
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| 235 | ENDDO |
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| 236 | |
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| 237 | DO ig=1,ngrid |
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| 238 | IF(zout .lt. pz0tcomp(ig)) THEN |
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| 239 | u_out(ig,n)=0. |
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| 240 | Teta_out(ig,n)=pts(ig) |
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| 241 | ELSE |
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| 242 | u_out(ig,n)= ustar(ig)*log(zout/pz0(ig))/ |
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| 243 | &(karman*sqrt(fm(ig))) |
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| 244 | |
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| 245 | Teta_out(ig,n)=pts(ig)+(tstar(ig)*sqrt(fm(ig))*log(zout/ |
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| 246 | & (pz0tcomp(ig)))/ |
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| 247 | &(karman*fh(ig))) |
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| 248 | |
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| 249 | ENDIF |
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| 250 | |
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| 251 | IF (zout .lt. pz0(ig)) THEN |
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| 252 | u_out(ig,n)=0. |
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| 253 | ENDIF |
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| 254 | |
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| 255 | ENDDO |
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| 256 | |
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| 257 | ! when using convective adjustment without thermals, a vertical potential temperature |
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| 258 | ! profile is assumed up to the thermal roughness length. Hence, theoretically, theta |
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| 259 | ! interpolated at any height in the surface layer is theta at the first level. |
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| 260 | |
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| 261 | IF ((.not.calltherm).and.(calladj)) THEN |
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| 262 | Teta_out(:,n)=ph(:,1) |
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| 263 | u_out(:,n)=(sqrt(cdn(:))*sqrt(pu(:,1)*pu(:,1)+pv(:,1)*pv(:,1)) |
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| 264 | & /karman)*log(zout/pz0(:)) |
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| 265 | ENDIF |
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| 266 | T_out(:,n) = Teta_out(:,n)*(exp( |
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| 267 | & (zout/zzlay(:,1))*(log(pplay(:,1)/ps)) |
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| 268 | & ) |
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| 269 | & )**rcp |
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| 270 | |
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| 271 | ENDDO !of n=1,n_out |
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| 272 | |
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| 273 | !------------------------------------------------------------------------ |
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| 274 | !------------------------------------------------------------------------ |
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| 275 | ! PART III : WSTAR COMPUTATION |
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| 276 | !------------------------------------------------------------------------ |
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| 277 | !------------------------------------------------------------------------ |
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| 278 | |
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| 279 | ! Detection of the mixed-layer potential temperature |
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| 280 | ! ------------ |
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| 281 | |
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| 282 | ! Nearest index for the pbl height |
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| 283 | |
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| 284 | IF (calltherm) THEN |
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| 285 | |
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| 286 | pbl_height_index(:)=1 |
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| 287 | |
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| 288 | DO k=1,nlay-1 |
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| 289 | DO ig=1, ngrid |
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| 290 | IF (abs(zmax(ig)-zzlay(ig,k)) .lt. |
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| 291 | & abs(zmax(ig)-zzlay(ig,pbl_height_index(ig)))) THEN |
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| 292 | pbl_height_index(ig)=k |
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| 293 | ENDIF |
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| 294 | ENDDO |
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| 295 | ENDDO |
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| 296 | |
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| 297 | ! Potential temperature gradient |
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| 298 | |
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| 299 | dteta(:,nlay)=0. |
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| 300 | DO k=1,nlay-1 |
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| 301 | DO ig=1, ngrid |
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| 302 | dteta(ig,k) = (ph(ig,k+1)-ph(ig,k))/(zzlay(ig,k+1)-zzlay(ig,k)) |
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| 303 | ENDDO |
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| 304 | ENDDO |
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| 305 | |
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| 306 | ! Computation of the pbl mixed layer temperature |
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| 307 | |
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| 308 | DO ig=1, ngrid |
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| 309 | ii=MINLOC(abs(dteta(ig,1:pbl_height_index(ig)))) |
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| 310 | pbl_teta(ig) = ph(ig,ii(1)) |
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| 311 | ENDDO |
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| 312 | |
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| 313 | !------------------------------------------------------------------------ |
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| 314 | !------------------------------------------------------------------------ |
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| 315 | ! PART IV : VERTICAL_VELOCITY_VARIANCE/VERTICAL_TURBULENT_FLUX PROFILES |
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| 316 | !------------------------------------------------------------------------ |
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| 317 | !------------------------------------------------------------------------ |
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| 318 | |
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| 319 | ! We follow Spiga et. al 2010 (QJRMS) |
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| 320 | ! ------------ |
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| 321 | |
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| 322 | DO ig=1, ngrid |
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| 323 | IF (zmax(ig) .gt. 0.) THEN |
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| 324 | x(ig) = zout/zmax(ig) |
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| 325 | ELSE |
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| 326 | x(ig) = 999. |
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| 327 | ENDIF |
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| 328 | ENDDO |
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| 329 | |
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| 330 | DO ig=1, ngrid |
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| 331 | ! dimensionless vertical heat flux |
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| 332 | IF (x(ig) .le. 0.3) THEN |
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| 333 | dvhf(ig) = ((-3.85/log(x(ig)))+0.07*log(x(ig))) |
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| 334 | & *exp(-4.61*x(ig)) |
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| 335 | ELSEIF (x(ig) .le. 1.) THEN |
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| 336 | dvhf(ig) = -1.52*x(ig) + 1.24 |
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| 337 | ELSE |
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| 338 | dvhf(ig) = 0. |
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| 339 | ENDIF |
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| 340 | ! dimensionless vertical velocity variance |
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| 341 | IF (x(ig) .le. 1.) THEN |
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| 342 | dvvv(ig) = 2.05*(x(ig)**(2./3.))*(1.-0.64*x(ig))**2 |
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| 343 | ELSE |
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| 344 | dvvv(ig) = 0. |
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| 345 | ENDIF |
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| 346 | ENDDO |
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| 347 | |
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| 348 | vhf(:) = dvhf(:)*hfmax(:) |
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| 349 | vvv(:) = dvvv(:)*(wstar_in(:))**2 |
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| 350 | |
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| 351 | ENDIF ! of if calltherm |
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| 352 | |
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| 353 | #ifndef MESOSCALE |
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| 354 | call WRITEDIAGFI(ngrid,'rib_pbl', |
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| 355 | & 'Richardson in pbl parameter','m/s',2,rib) |
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| 356 | call WRITEDIAGFI(ngrid,'cdn_pbl', |
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| 357 | & 'neutral momentum coef','m/s',2,cdn) |
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| 358 | call WRITEDIAGFI(ngrid,'fm_pbl', |
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| 359 | & 'momentum stab function','m/s',2,fm) |
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| 360 | call WRITEDIAGFI(ngrid,'uv', |
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| 361 | & 'wind norm first layer','m/s',2,sqrt(zu2)) |
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| 362 | call WRITEDIAGFI(ngrid,'uvtrue', |
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| 363 | & 'wind norm first layer','m/s',2,sqrt(pu(:,1)**2+pv(:,1)**2)) |
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| 364 | call WRITEDIAGFI(ngrid,'chn_pbl', |
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| 365 | & 'neutral momentum coef','m/s',2,chn) |
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| 366 | call WRITEDIAGFI(ngrid,'fh_pbl', |
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| 367 | & 'momentum stab function','m/s',2,fh) |
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| 368 | call WRITEDIAGFI(ngrid,'B_pbl', |
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| 369 | & 'buoyancy','m/',2,(ph(:,1)-pts(:))/pts(:)) |
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| 370 | call WRITEDIAGFI(ngrid,'zot_pbl', |
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| 371 | & 'buoyancy','ms',2,pz0tcomp) |
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| 372 | call WRITEDIAGFI(ngrid,'zz1','buoyancy','m',2,zzlay(:,1)) |
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| 373 | #endif |
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| 374 | |
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| 375 | RETURN |
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| 376 | END |
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