| 1 |
guez |
52 |
|
| 2 |
|
|
SUBROUTINE cv_unsat(nloc,ncum,nd,inb,t,q,qs,gz,u,v,p,ph & |
| 3 |
|
|
,h,lv,ep,sigp,clw,m,ment,elij & |
| 4 |
|
|
,iflag,mp,qp,up,vp,wt,water,evap) |
| 5 |
|
|
use cvthermo |
| 6 |
|
|
use cvparam |
| 7 |
|
|
implicit none |
| 8 |
|
|
|
| 9 |
|
|
|
| 10 |
|
|
|
| 11 |
|
|
! inputs: |
| 12 |
|
|
integer ncum, nd, nloc |
| 13 |
|
|
integer inb(nloc) |
| 14 |
|
|
real t(nloc,nd), q(nloc,nd), qs(nloc,nd) |
| 15 |
|
|
real gz(nloc,nd), u(nloc,nd), v(nloc,nd) |
| 16 |
|
|
real p(nloc,nd), ph(nloc,nd+1), h(nloc,nd) |
| 17 |
|
|
real lv(nloc,nd), ep(nloc,nd), sigp(nloc,nd), clw(nloc,nd) |
| 18 |
|
|
real m(nloc,nd), ment(nloc,nd,nd), elij(nloc,nd,nd) |
| 19 |
|
|
|
| 20 |
|
|
! outputs: |
| 21 |
|
|
integer iflag(nloc) ! also an input |
| 22 |
|
|
real mp(nloc,nd), qp(nloc,nd), up(nloc,nd), vp(nloc,nd) |
| 23 |
|
|
real water(nloc,nd), evap(nloc,nd), wt(nloc,nd) |
| 24 |
|
|
|
| 25 |
|
|
! local variables: |
| 26 |
|
|
integer i,j,k,ij,num1 |
| 27 |
|
|
integer jtt(nloc) |
| 28 |
|
|
real awat, coeff, qsm, afac, sigt, b6, c6, revap |
| 29 |
|
|
real dhdp, fac, qstm, rat |
| 30 |
|
|
real wdtrain(nloc) |
| 31 |
|
|
logical lwork(nloc) |
| 32 |
|
|
|
| 33 |
|
|
!===================================================================== |
| 34 |
|
|
! --- PRECIPITATING DOWNDRAFT CALCULATION |
| 35 |
|
|
!===================================================================== |
| 36 |
|
|
! |
| 37 |
|
|
! Initializations: |
| 38 |
|
|
! |
| 39 |
|
|
do i = 1, ncum |
| 40 |
|
|
do k = 1, nl+1 |
| 41 |
|
|
wt(i,k) = omtsnow |
| 42 |
|
|
mp(i,k) = 0.0 |
| 43 |
|
|
evap(i,k) = 0.0 |
| 44 |
|
|
water(i,k) = 0.0 |
| 45 |
|
|
enddo |
| 46 |
|
|
enddo |
| 47 |
|
|
|
| 48 |
|
|
do 420 i=1,ncum |
| 49 |
|
|
qp(i,1)=q(i,1) |
| 50 |
|
|
up(i,1)=u(i,1) |
| 51 |
|
|
vp(i,1)=v(i,1) |
| 52 |
|
|
420 continue |
| 53 |
|
|
|
| 54 |
|
|
do 440 k=2,nl+1 |
| 55 |
|
|
do 430 i=1,ncum |
| 56 |
|
|
qp(i,k)=q(i,k-1) |
| 57 |
|
|
up(i,k)=u(i,k-1) |
| 58 |
|
|
vp(i,k)=v(i,k-1) |
| 59 |
|
|
430 continue |
| 60 |
|
|
440 continue |
| 61 |
|
|
|
| 62 |
|
|
|
| 63 |
|
|
! *** Check whether ep(inb)=0, if so, skip precipitating *** |
| 64 |
|
|
! *** downdraft calculation *** |
| 65 |
|
|
! |
| 66 |
|
|
! |
| 67 |
|
|
! *** Integrate liquid water equation to find condensed water *** |
| 68 |
|
|
! *** and condensed water flux *** |
| 69 |
|
|
! |
| 70 |
|
|
! |
| 71 |
|
|
do 890 i=1,ncum |
| 72 |
|
|
jtt(i)=2 |
| 73 |
|
|
if(ep(i,inb(i)).le.0.0001)iflag(i)=2 |
| 74 |
|
|
if(iflag(i).eq.0)then |
| 75 |
|
|
lwork(i)=.true. |
| 76 |
|
|
else |
| 77 |
|
|
lwork(i)=.false. |
| 78 |
|
|
endif |
| 79 |
|
|
890 continue |
| 80 |
|
|
! |
| 81 |
|
|
! *** Begin downdraft loop *** |
| 82 |
|
|
! |
| 83 |
|
|
! |
| 84 |
|
|
call zilch(wdtrain,ncum) |
| 85 |
|
|
do 899 i=nl+1,1,-1 |
| 86 |
|
|
! |
| 87 |
|
|
num1=0 |
| 88 |
|
|
do 879 ij=1,ncum |
| 89 |
|
|
if((i.le.inb(ij)).and.lwork(ij))num1=num1+1 |
| 90 |
|
|
879 continue |
| 91 |
|
|
if(num1.le.0)go to 899 |
| 92 |
|
|
! |
| 93 |
|
|
! |
| 94 |
|
|
! *** Calculate detrained precipitation *** |
| 95 |
|
|
! |
| 96 |
|
|
do 891 ij=1,ncum |
| 97 |
|
|
if((i.le.inb(ij)).and.(lwork(ij)))then |
| 98 |
|
|
wdtrain(ij)=g*ep(ij,i)*m(ij,i)*clw(ij,i) |
| 99 |
|
|
endif |
| 100 |
|
|
891 continue |
| 101 |
|
|
! |
| 102 |
|
|
if(i.gt.1)then |
| 103 |
|
|
do 893 j=1,i-1 |
| 104 |
|
|
do 892 ij=1,ncum |
| 105 |
|
|
if((i.le.inb(ij)).and.(lwork(ij)))then |
| 106 |
|
|
awat=elij(ij,j,i)-(1.-ep(ij,i))*clw(ij,i) |
| 107 |
|
|
awat=max(0.0,awat) |
| 108 |
|
|
wdtrain(ij)=wdtrain(ij)+g*awat*ment(ij,j,i) |
| 109 |
|
|
endif |
| 110 |
|
|
892 continue |
| 111 |
|
|
893 continue |
| 112 |
|
|
endif |
| 113 |
|
|
! |
| 114 |
|
|
! *** Find rain water and evaporation using provisional *** |
| 115 |
|
|
! *** estimates of qp(i)and qp(i-1) *** |
| 116 |
|
|
! |
| 117 |
|
|
! |
| 118 |
|
|
! *** Value of terminal velocity and coeffecient of evaporation for snow *** |
| 119 |
|
|
! |
| 120 |
|
|
do 894 ij=1,ncum |
| 121 |
|
|
if((i.le.inb(ij)).and.(lwork(ij)))then |
| 122 |
|
|
coeff=coeffs |
| 123 |
|
|
wt(ij,i)=omtsnow |
| 124 |
|
|
! |
| 125 |
|
|
! *** Value of terminal velocity and coeffecient of evaporation for rain *** |
| 126 |
|
|
! |
| 127 |
|
|
if(t(ij,i).gt.273.0)then |
| 128 |
|
|
coeff=coeffr |
| 129 |
|
|
wt(ij,i)=omtrain |
| 130 |
|
|
endif |
| 131 |
|
|
qsm=0.5*(q(ij,i)+qp(ij,i+1)) |
| 132 |
|
|
afac=coeff*ph(ij,i)*(qs(ij,i)-qsm) & |
| 133 |
|
|
/(1.0e4+2.0e3*ph(ij,i)*qs(ij,i)) |
| 134 |
|
|
afac=max(afac,0.0) |
| 135 |
|
|
sigt=sigp(ij,i) |
| 136 |
|
|
sigt=max(0.0,sigt) |
| 137 |
|
|
sigt=min(1.0,sigt) |
| 138 |
|
|
b6=100.*(ph(ij,i)-ph(ij,i+1))*sigt*afac/wt(ij,i) |
| 139 |
|
|
c6=(water(ij,i+1)*wt(ij,i+1)+wdtrain(ij)/sigd)/wt(ij,i) |
| 140 |
|
|
revap=0.5*(-b6+sqrt(b6*b6+4.*c6)) |
| 141 |
|
|
evap(ij,i)=sigt*afac*revap |
| 142 |
|
|
water(ij,i)=revap*revap |
| 143 |
|
|
! |
| 144 |
|
|
! *** Calculate precipitating downdraft mass flux under *** |
| 145 |
|
|
! *** hydrostatic approximation *** |
| 146 |
|
|
! |
| 147 |
|
|
if(i.gt.1)then |
| 148 |
|
|
dhdp=(h(ij,i)-h(ij,i-1))/(p(ij,i-1)-p(ij,i)) |
| 149 |
|
|
dhdp=max(dhdp,10.0) |
| 150 |
|
|
mp(ij,i)=100.*ginv*lv(ij,i)*sigd*evap(ij,i)/dhdp |
| 151 |
|
|
mp(ij,i)=max(mp(ij,i),0.0) |
| 152 |
|
|
! |
| 153 |
|
|
! *** Add small amount of inertia to downdraft *** |
| 154 |
|
|
! |
| 155 |
|
|
fac=20.0/(ph(ij,i-1)-ph(ij,i)) |
| 156 |
|
|
mp(ij,i)=(fac*mp(ij,i+1)+mp(ij,i))/(1.+fac) |
| 157 |
|
|
! |
| 158 |
|
|
! *** Force mp to decrease linearly to zero *** |
| 159 |
|
|
! *** between about 950 mb and the surface *** |
| 160 |
|
|
! |
| 161 |
|
|
if(p(ij,i).gt.(0.949*p(ij,1)))then |
| 162 |
|
|
jtt(ij)=max(jtt(ij),i) |
| 163 |
|
|
mp(ij,i)=mp(ij,jtt(ij))*(p(ij,1)-p(ij,i)) & |
| 164 |
|
|
/(p(ij,1)-p(ij,jtt(ij))) |
| 165 |
|
|
endif |
| 166 |
|
|
endif |
| 167 |
|
|
! |
| 168 |
|
|
! *** Find mixing ratio of precipitating downdraft *** |
| 169 |
|
|
! |
| 170 |
|
|
if(i.ne.inb(ij))then |
| 171 |
|
|
if(i.eq.1)then |
| 172 |
|
|
qstm=qs(ij,1) |
| 173 |
|
|
else |
| 174 |
|
|
qstm=qs(ij,i-1) |
| 175 |
|
|
endif |
| 176 |
|
|
if(mp(ij,i).gt.mp(ij,i+1))then |
| 177 |
|
|
rat=mp(ij,i+1)/mp(ij,i) |
| 178 |
|
|
qp(ij,i)=qp(ij,i+1)*rat+q(ij,i)*(1.0-rat)+100.*ginv* & |
| 179 |
|
|
sigd*(ph(ij,i)-ph(ij,i+1))*(evap(ij,i)/mp(ij,i)) |
| 180 |
|
|
up(ij,i)=up(ij,i+1)*rat+u(ij,i)*(1.-rat) |
| 181 |
|
|
vp(ij,i)=vp(ij,i+1)*rat+v(ij,i)*(1.-rat) |
| 182 |
|
|
else |
| 183 |
|
|
if(mp(ij,i+1).gt.0.0)then |
| 184 |
|
|
qp(ij,i)=(gz(ij,i+1)-gz(ij,i) & |
| 185 |
|
|
+qp(ij,i+1)*(lv(ij,i+1)+t(ij,i+1) & |
| 186 |
|
|
*(cl-cpd))+cpd*(t(ij,i+1)-t(ij,i))) & |
| 187 |
|
|
/(lv(ij,i)+t(ij,i)*(cl-cpd)) |
| 188 |
|
|
up(ij,i)=up(ij,i+1) |
| 189 |
|
|
vp(ij,i)=vp(ij,i+1) |
| 190 |
|
|
endif |
| 191 |
|
|
endif |
| 192 |
|
|
qp(ij,i)=min(qp(ij,i),qstm) |
| 193 |
|
|
qp(ij,i)=max(qp(ij,i),0.0) |
| 194 |
|
|
endif |
| 195 |
|
|
endif |
| 196 |
|
|
894 continue |
| 197 |
|
|
899 continue |
| 198 |
|
|
! |
| 199 |
|
|
return |
| 200 |
|
|
end |
Parent Directory
| 
Revision Log