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A collection of diagnostic and interpolation routines for use with output from the Weather Research and Forecasting (WRF-ARW) Model.
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wrf-python/fortran/rip_cape.f90

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!======================================================================
!
! !IROUTINE: VIRTUAL -- Calculate virtual temperature (K)
!
! !DESCRIPTION:
!
! This function returns a single value of virtual temperature in
! K, given temperature in K and mixing ratio in kg/kg. For an
! array of virtual temperatures, use subroutine VIRTUAL_TEMP.
!
! !INPUT:
! RATMIX - water vapor mixing ratio (kg/kg)
! TEMP - temperature (K)
!
! !OUTPUT:
! TV - Virtual temperature (K)
!
! NCLFORTSTART
REAL(KIND=8) FUNCTION TVIRTUAL(temp, ratmix)
USE constants, ONLY : EPS
!f2py threadsafe
IMPLICIT NONE
REAL(KIND=8), INTENT(IN) :: temp, ratmix
! NCLEND
TVIRTUAL = temp*(EPS + ratmix)/(EPS*(1.D0 + ratmix))
RETURN
END FUNCTION TVIRTUAL
! NCLFORTSTART
REAL(KIND=8) FUNCTION TONPSADIABAT(thte,prs,psadithte,psadiprs,psaditmk,gamma,&
errstat, errmsg)
USE constants, ONLY : ALGERR
!f2py threadsafe
!f2py intent(in,out) :: cape, cin
IMPLICIT NONE
REAL(KIND=8), INTENT(IN) :: thte
REAL(KIND=8), INTENT(IN) :: prs
REAL(KIND=8), DIMENSION(150), INTENT(IN) :: psadithte
REAL(KIND=8), DIMENSION(150), INTENT(IN) :: psadiprs
REAL(KIND=8), DIMENSION(150,150), INTENT(IN) :: psaditmk
REAL(KIND=8), INTENT(IN) :: gamma
INTEGER, INTENT(INOUT) :: errstat
CHARACTER(LEN=*), INTENT(INOUT) :: errmsg
! NCLEND
REAL(KIND=8) :: fracjt
REAL(KIND=8) :: fracjt2
REAL(KIND=8) :: fracip
REAL(KIND=8) :: fracip2
INTEGER :: ip, ipch, jt, jtch
! This function gives the temperature (in K) on a moist adiabat
! (specified by thte in K) given pressure in hPa. It uses a
! lookup table, with data that was generated by the Bolton (1980)
! formula for theta_e.
! First check if pressure is less than min pressure in lookup table.
! If it is, assume parcel is so dry that the given theta-e value can
! be interpretted as theta, and get temperature from the simple dry
! theta formula.
IF (prs .LE. psadiprs(150)) THEN
TONPSADIABAT = thte * (prs/1000.D0)**gamma
RETURN
END IF
! Otherwise, look for the given thte/prs point in the lookup table.
jt = -1
DO jtch = 1, 150-1
IF (thte .GE. psadithte(jtch) .AND. thte .LT. psadithte(jtch+1)) THEN
jt = jtch
EXIT
!GO TO 213
END IF
END DO
ip = -1
DO ipch = 1, 150-1
IF (prs .LE. psadiprs(ipch) .AND. prs .GT. psadiprs(ipch+1)) THEN
ip = ipch
EXIT
!GO TO 215
END IF
END DO
IF (jt .EQ. -1 .OR. ip .EQ. -1) THEN
! Set the error and return
TONPSADIABAT = -1
errstat = ALGERR
WRITE(errmsg, *) "capecalc3d: Outside of lookup table bounds. prs,thte=", prs, thte
RETURN
END IF
fracjt = (thte-psadithte(jt)) / (psadithte(jt+1)-psadithte(jt))
fracjt2 = 1.D0 - fracjt
fracip = (psadiprs(ip)-prs) / (psadiprs(ip)-psadiprs(ip+1))
fracip2 = 1.D0 - fracip
IF (psaditmk(ip,jt) .GT. 1D9 .OR. psaditmk(ip+1,jt) .GT. 1D9 .OR. &
psaditmk(ip,jt+1) .GT. 1D9 .OR. psaditmk(ip+1,jt+1) .GT. 1D9) THEN
! Set the error and return
TONPSADIABAT = -1
errstat = ALGERR
WRITE(errmsg, *) "capecalc3d: Tried to access missing temperature in lookup table. ", &
"Prs and Thte probably unreasonable. prs,thte=", prs, thte
RETURN
END IF
TONPSADIABAT = fracip2*fracjt2*psaditmk(ip,jt) + fracip*fracjt2*psaditmk(ip+1,jt) + &
fracip2*fracjt*psaditmk(ip,jt+1) + fracip*fracjt*psaditmk(ip+1,jt+1)
RETURN
END FUNCTION TONPSADIABAT
!NCLFORTSTART
SUBROUTINE DLOOKUP_TABLE(psadithte, psadiprs, psaditmk, fname, errstat, errmsg)
USE constants, ONLY : ALGERR
!f2py threadsafe
REAL(KIND=8), DIMENSION(150), INTENT(INOUT) :: psadithte, psadiprs
REAL(KIND=8), DIMENSION(150,150), INTENT(INOUT) :: psaditmk
CHARACTER(LEN=*), INTENT(IN) :: fname
INTEGER, INTENT(INOUT) :: errstat
CHARACTER(LEN=*), INTENT(INOUT) :: errmsg
!NCLEND
! Locals
INTEGER :: iustnlist, i, nthte, nprs, ip, jt
! FNAME = 'psadilookup.dat'
iustnlist = 33
OPEN (UNIT=iustnlist, FILE=fname, FORM='formatted', STATUS='old')
DO i = 1,14
READ (iustnlist, FMT=*)
END DO
READ (iustnlist, FMT=*) nthte, nprs
IF (nthte .NE. 150 .OR. nprs .NE. 150) THEN
errstat = ALGERR
errmsg = "Number of pressure or theta_e levels in lookup table file not 150"
RETURN
END IF
READ (iustnlist, FMT="(5D15.7)") (psadithte(jt),jt=1,nthte)
READ (iustnlist, FMT="(5D15.7)") (psadiprs(ip),ip=1,nprs)
READ (iustnlist, FMT="(5D15.7)") ((psaditmk(ip,jt),ip=1,nprs),jt=1,nthte)
CLOSE (iustnlist)
RETURN
END SUBROUTINE DLOOKUP_TABLE
! Historically, this routine calculated the pressure at full sigma
! levels when RIP was specifically designed for MM4/MM5 output.
! With the new generalized RIP (Feb '02), this routine is still
! intended to calculate a set of pressure levels that bound the
! layers represented by the vertical grid points, although no such
! layer boundaries are assumed to be defined. The routine simply
! uses the midpoint between the pressures of the vertical grid
! points as the bounding levels. The array only contains mkzh
! levels, so the pressure of the top of the uppermost layer is
! actually excluded. The kth value of pf is the lower bounding
! pressure for the layer represented by kth data level. At the
! lower bounding level of the lowest model layer, it uses the
! surface pressure, unless the data set is pressure-level data, in
! which case it assumes the lower bounding pressure level is as far
! below the lowest vertical level as the upper bounding pressure
! level is above.
SUBROUTINE DPFCALC(prs, sfp, pf, miy, mjx, mkzh, ter_follow)
REAL(KIND=8), DIMENSION(miy,mjx,mkzh), INTENT(IN) :: prs
REAL(KIND=8), DIMENSION(miy,mjx), INTENT(IN) :: sfp
REAL(KIND=8), DIMENSION(miy,mjx,mkzh), INTENT(OUT) :: pf
INTEGER, INTENT(IN) :: ter_follow,miy,mjx,mkzh
INTEGER :: i,j,k
! do j=1,mjx-1 Artifact of MM5
DO j = 1,mjx
! do i=1,miy-1 staggered grid
DO i = 1,miy
DO k = 1,mkzh
IF (k .EQ. mkzh) THEN
! terrain-following data
IF (ter_follow .EQ. 1) THEN
pf(i,j,k) = sfp(i,j)
! pressure-level data
ELSE
pf(i,j,k) = .5D0 * (3.D0*prs(i,j,k) - prs(i,j,k-1))
END IF
ELSE
pf(i,j,k) = .5D0 * (prs(i,j,k+1) + prs(i,j,k))
END IF
END DO
END DO
END DO
RETURN
END SUBROUTINE DPFCALC
!======================================================================
!
! !IROUTINE: capecalc3d -- Calculate CAPE and CIN
!
! !DESCRIPTION:
!
! If i3dflag=1, this routine calculates CAPE and CIN (in m**2/s**2,
! or J/kg) for every grid point in the entire 3D domain (treating
! each grid point as a parcel). If i3dflag=0, then it
! calculates CAPE and CIN only for the parcel with max theta-e in
! the column, (i.e. something akin to Colman's MCAPE). By "parcel",
! we mean a 500-m deep parcel, with actual temperature and moisture
! averaged over that depth.
!
! In the case of i3dflag=0,
! CAPE and CIN are 2D fields that are placed in the k=mkzh slabs of
! the cape and cin arrays. Also, if i3dflag=0, LCL and LFC heights
! are put in the k=mkzh-1 and k=mkzh-2 slabs of the cin array.
!
! Important! The z-indexes must be arranged so that mkzh (max z-index) is the
! surface pressure. So, pressure must be ordered in ascending order before
! calling this routine. Other variables must be ordered the same (p,tk,q,z).
! Also, be advised that missing data values are not checked during the computation.
! Also also, Pressure must be hPa
! NCLFORTSTART
SUBROUTINE DCAPECALC3D(prs,tmk,qvp,ght,ter,sfp,cape,cin,&
cmsg,miy,mjx,mkzh,i3dflag,ter_follow,&
psafile, errstat, errmsg)
USE constants, ONLY : ALGERR, CELKEL, G, EZERO, ESLCON1, ESLCON2, &
EPS, RD, CP, GAMMA, CPMD, RGASMD, GAMMAMD, TLCLC1, &
TLCLC2, TLCLC3, TLCLC4, THTECON1, THTECON2, THTECON3
IMPLICIT NONE
!f2py threadsafe
!f2py intent(in,out) :: cape, cin
INTEGER, INTENT(IN) :: miy,mjx,mkzh,i3dflag,ter_follow
REAL(KIND=8), DIMENSION(miy,mjx,mkzh), INTENT(IN) :: prs
REAL(KIND=8), DIMENSION(miy,mjx,mkzh), INTENT(IN) :: tmk
REAL(KIND=8), DIMENSION(miy,mjx,mkzh), INTENT(IN) :: qvp
REAL(KIND=8), DIMENSION(miy,mjx,mkzh), INTENT(IN) :: ght
REAL(KIND=8), DIMENSION(miy,mjx), INTENT(IN) :: ter
REAL(KIND=8), DIMENSION(miy,mjx), INTENT(IN) ::sfp
REAL(KIND=8), DIMENSION(miy,mjx,mkzh), INTENT(OUT) :: cape
REAL(KIND=8), DIMENSION(miy,mjx,mkzh), INTENT(OUT) :: cin
REAL(KIND=8), INTENT(IN) :: cmsg
CHARACTER(LEN=*), INTENT(IN) :: psafile
INTEGER, INTENT(INOUT) :: errstat
CHARACTER(LEN=*), INTENT(INOUT) :: errmsg
! NCLFORTEND
! local variables
INTEGER :: i, j, k, ilcl, kel, kk, klcl, klev, klfc, kmax, kpar, kpar1, kpar2
REAL(KIND=8) :: davg, ethmax, q, t, p, e, eth, tlcl, zlcl
REAL(KIND=8) :: pavg, tvirtual, p1, p2, pp1, pp2, th, totthe, totqvp, totprs
REAL(KIND=8) :: cpm, deltap, ethpari, gammam, ghtpari, qvppari, prspari, tmkpari
REAL(KIND=8) :: facden, fac1, fac2, qvplift, tmklift, tvenv, tvlift, ghtlift
REAL(KIND=8) :: eslift, tmkenv, qvpenv, tonpsadiabat
REAL(KIND=8) :: benamin, dz, pup, pdn
REAL(KIND=8), DIMENSION(150) :: buoy, zrel, benaccum
REAL(KIND=8), DIMENSION(miy,mjx,mkzh) :: prsf
REAL(KIND=8), DIMENSION(150) :: psadithte, psadiprs
REAL(KIND=8), DIMENSION(150,150) :: psaditmk
LOGICAL :: elfound
! To remove compiler warnings
tmkpari = 0
qvppari = 0
klev = 0
klcl = 0
kel = 0
! the comments were taken from a mark stoelinga email, 23 apr 2007,
! in response to a user getting the "outside of lookup table bounds"
! error message.
! tmkpari - initial temperature of parcel, k
! values of 300 okay. (not sure how much from this you can stray.)
! prspari - initial pressure of parcel, hpa
! values of 980 okay. (not sure how much from this you can stray.)
! thtecon1, thtecon2, thtecon3
! these are all constants, the first in k and the other two have
! no units. values of 3376, 2.54, and 0.81 were stated as being
! okay.
! tlcl - the temperature at the parcel's lifted condensation level, k
! should be a reasonable atmospheric temperature around 250-300 k
! (398 is "way too high")
! qvppari - the initial water vapor mixing ratio of the parcel,
! kg/kg (should range from 0.000 to 0.025)
!
! calculated the pressure at full sigma levels (a set of pressure
! levels that bound the layers represented by the vertical grid points)
CALL DPFCALC(prs, sfp, prsf, miy, mjx, mkzh, ter_follow)
! before looping, set lookup table for getting temperature on
! a pseudoadiabat.
CALL DLOOKUP_TABLE(psadithte, psadiprs, psaditmk, psafile, errstat, errmsg)
IF (errstat .NE. 0) THEN
RETURN
END IF
! do j=1,mjx-1
DO j = 1,mjx
! do i=1,miy-1
DO i = 1,miy
cape(i,j,1) = 0.d0
cin(i,j,1) = 0.d0
IF (i3dflag .EQ. 1) THEN
kpar1 = 2
kpar2 = mkzh
ELSE
! find parcel with max theta-e in lowest 3 km agl.
ethmax = -1.d0
DO k = mkzh,1,-1
IF (ght(i,j,k)-ter(i,j) .LT. 3000.d0) THEN
q = MAX(qvp(i,j,k), 1.d-15)
t = tmk(i,j,k)
p = prs(i,j,k)
e = q*p/(EPS + q)
tlcl = TLCLC1 / (LOG(t**TLCLC2/e)-TLCLC3) + TLCLC4
eth = t * (1000.d0/p)**(GAMMA*(1.d0 + GAMMAMD*q))*&
EXP((THTECON1/tlcl - THTECON2)*q*(1.d0 + THTECON3*q))
IF (eth .GT. ethmax) THEN
klev = k
ethmax = eth
END IF
END IF
END DO
kpar1 = klev
kpar2 = klev
! Establish average properties of that parcel
! (over depth of approximately davg meters)
! davg=.1
davg = 500.d0
pavg = davg*prs(i,j,kpar1)*&
G/(RD*tvirtual(tmk(i,j,kpar1), qvp(i,j,kpar1)))
p2 = MIN(prs(i,j,kpar1)+.5d0*pavg, prsf(i,j,mkzh))
p1 = p2 - pavg
totthe = 0.d0
totqvp = 0.d0
totprs = 0.d0
DO k = mkzh,2,-1
IF (prsf(i,j,k) .LE. p1) EXIT !GOTO 35
IF (prsf(i,j,k-1) .GE. p2) CYCLE !GOTO 34
p = prs(i,j,k)
pup = prsf(i,j,k)
pdn = prsf(i,j,k-1)
q = MAX(qvp(i,j,k),1.d-15)
th = tmk(i,j,k)*(1000.d0/p)**(GAMMA*(1.d0 + GAMMAMD*q))
pp1 = MAX(p1,pdn)
pp2 = MIN(p2,pup)
IF (pp2 .GT. pp1) THEN
deltap = pp2 - pp1
totqvp = totqvp + q*deltap
totthe = totthe + th*deltap
totprs = totprs + deltap
END IF
! 34 CONTINUE
END DO
! 35 CONTINUE
qvppari = totqvp/totprs
tmkpari = (totthe/totprs)*&
(prs(i,j,kpar1)/1000.d0)**(GAMMA*(1.d0+GAMMAMD*qvp(i,j,kpar1)))
END IF
DO kpar = kpar1, kpar2
! Calculate temperature and moisture properties of parcel
! (note, qvppari and tmkpari already calculated above for 2d case.)
IF (i3dflag .EQ. 1) THEN
qvppari = qvp(i,j,kpar)
tmkpari = tmk(i,j,kpar)
END IF
prspari = prs(i,j,kpar)
ghtpari = ght(i,j,kpar)
gammam = GAMMA * (1.d0 + GAMMAMD*qvppari)
cpm = CP * (1.d0 + CPMD*qvppari)
e = MAX(1.d-20,qvppari*prspari/(EPS + qvppari))
tlcl = TLCLC1/(LOG(tmkpari**TLCLC2/e) - TLCLC3) + TLCLC4
ethpari = tmkpari*(1000.d0/prspari)**(GAMMA*(1.d0 + GAMMAMD*qvppari))*&
EXP((THTECON1/tlcl - THTECON2)*qvppari*(1.d0 + THTECON3*qvppari))
zlcl = ghtpari + (tmkpari - tlcl)/(G/cpm)
! Calculate buoyancy and relative height of lifted parcel at
! all levels, and store in bottom up arrays. add a level at the lcl,
! and at all points where buoyancy is zero.
!
! For arrays that go bottom to top
kk = 0
ilcl = 0
IF (ghtpari .GE. zlcl) THEN
! Initial parcel already saturated or supersaturated.
ilcl = 2
klcl = 1
END IF
k = kpar
DO WHILE (k .GE. 1)!k = kpar, 1, -1
!DO k = kpar, 1, -1
! For arrays that go bottom to top
! 33 kk = kk + 1
kk = kk + 1
! Model level is below lcl
IF (ght(i,j,k) .LT. zlcl) THEN
qvplift = qvppari
tmklift = tmkpari - G/cpm*(ght(i,j,k) - ghtpari)
tvenv = tvirtual(tmk(i,j,k), qvp(i,j,k))
tvlift = tvirtual(tmklift, qvplift)
ghtlift = ght(i,j,k)
ELSE IF (ght(i,j,k) .GE. zlcl .AND. ilcl .EQ. 0) THEN
! This model level and previous model level straddle the lcl,
! so first create a new level in the bottom-up array, at the lcl.
tmklift = tlcl
qvplift = qvppari
facden = ght(i,j,k) - ght(i,j,k+1)
fac1 = (zlcl-ght(i,j,k+1))/facden
fac2 = (ght(i,j,k)-zlcl)/facden
tmkenv = tmk(i,j,k+1)*fac2 + tmk(i,j,k)*fac1
qvpenv = qvp(i,j,k+1)*fac2 + qvp(i,j,k)*fac1
tvenv = tvirtual(tmkenv, qvpenv)
tvlift = tvirtual(tmklift, qvplift)
ghtlift = zlcl
ilcl = 1
ELSE
tmklift = TONPSADIABAT(ethpari, prs(i,j,k), psadithte, psadiprs,&
psaditmk, GAMMA, errstat, errmsg)
eslift = EZERO*EXP(ESLCON1*(tmklift - CELKEL)/(tmklift - ESLCON2))
qvplift = EPS*eslift/(prs(i,j,k) - eslift)
tvenv = tvirtual(tmk(i,j,k), qvp(i,j,k))
tvlift = tvirtual(tmklift, qvplift)
ghtlift = ght(i,j,k)
END IF
! Buoyancy
buoy(kk) = G*(tvlift - tvenv)/tvenv
zrel(kk) = ghtlift - ghtpari
IF ((kk .GT. 1) .AND. (buoy(kk)*buoy(kk-1) .LT. 0.0d0)) THEN
! Parcel ascent curve crosses sounding curve, so create a new level
! in the bottom-up array at the crossing.
kk = kk + 1
buoy(kk) = buoy(kk-1)
zrel(kk) = zrel(kk-1)
buoy(kk-1) = 0.d0
zrel(kk-1) = zrel(kk-2) + buoy(kk-2)/&
(buoy(kk-2) - buoy(kk))*(zrel(kk) - zrel(kk-2))
END IF
IF (ilcl .EQ. 1) THEN
klcl = kk
ilcl = 2
!GOTO 33
CYCLE
END IF
k = k - 1
END DO
kmax = kk
IF (kmax .GT. 150) THEN
errstat = ALGERR
WRITE(errmsg, *) 'capecalc3d: kmax got too big. kmax=',kmax
RETURN
END IF
! If no lcl was found, set klcl to kmax. it is probably not really
! at kmax, but this will make the rest of the routine behave
! properly.
IF (ilcl .EQ. 0) klcl=kmax
! Get the accumulated buoyant energy from the parcel's starting
! point, at all levels up to the top level.
benaccum(1) = 0.0d0
benamin = 9d9
DO k = 2,kmax
dz = zrel(k) - zrel(k-1)
benaccum(k) = benaccum(k-1) + .5d0*dz*(buoy(k-1) + buoy(k))
IF (benaccum(k) .LT. benamin) THEN
benamin = benaccum(k)
END IF
END DO
! Determine equilibrium level (el), which we define as the highest
! level of non-negative buoyancy above the lcl. note, this may be
! the top level if the parcel is still buoyant there.
elfound = .FALSE.
DO k = kmax,klcl,-1
IF (buoy(k) .GE. 0.d0) THEN
! k of equilibrium level
kel = k
elfound = .TRUE.
EXIT
!GOTO 50
END IF
END DO
! If we got through that loop, then there is no non-negative
! buoyancy above the lcl in the sounding. in these situations,
! both cape and cin will be set to -0.1 j/kg. (see below about
! missing values in v6.1.0). also, where cape is
! non-zero, cape and cin will be set to a minimum of +0.1 j/kg, so
! that the zero contour in either the cin or cape fields will
! circumscribe regions of non-zero cape.
! In v6.1.0 of ncl, we added a _fillvalue attribute to the return
! value of this function. at that time we decided to change -0.1
! to a more appropriate missing value, which is passed into this
! routine as cmsg.
! cape(i,j,kpar) = -0.1d0
! cin(i,j,kpar) = -0.1d0
IF (.NOT. elfound) THEN
cape(i,j,kpar) = cmsg
cin(i,j,kpar) = cmsg
klfc = kmax
CYCLE
END IF
! GOTO 102
! 50 CONTINUE
! If there is an equilibrium level, then cape is positive. we'll
! define the level of free convection (lfc) as the point below the
! el, but at or above the lcl, where accumulated buoyant energy is a
! minimum. the net positive area (accumulated buoyant energy) from
! the lfc up to the el will be defined as the cape, and the net
! negative area (negative of accumulated buoyant energy) from the
! parcel starting point to the lfc will be defined as the convective
! inhibition (cin).
! First get the lfc according to the above definition.
benamin = 9d9
klfc = kmax
DO k = klcl,kel
IF (benaccum(k) .LT. benamin) THEN
benamin = benaccum(k)
klfc = k
END IF
END DO
! Now we can assign values to cape and cin
cape(i,j,kpar) = MAX(benaccum(kel)-benamin, 0.1d0)
cin(i,j,kpar) = MAX(-benamin, 0.1d0)
! cin is uninteresting when cape is small (< 100 j/kg), so set
! cin to -0.1 (see note about missing values in v6.1.0) in
! that case.
! In v6.1.0 of ncl, we added a _fillvalue attribute to the return
! value of this function. at that time we decided to change -0.1
! to a more appropriate missing value, which is passed into this
! routine as cmsg.
! IF (cape(i,j,kpar).lt.100.d0) cin(i,j,kpar) = -0.1d0
IF (cape(i,j,kpar) .LT. 100.d0) cin(i,j,kpar) = cmsg
! 102 CONTINUE
END DO
IF (i3dflag .EQ. 0) THEN
cape(i,j,mkzh) = cape(i,j,kpar1)
cin(i,j,mkzh) = cin(i,j,kpar1)
! meters agl
cin(i,j,mkzh-1) = zrel(klcl) + ghtpari - ter(i,j)
! meters agl
cin(i,j,mkzh-2) = zrel(klfc) + ghtpari - ter(i,j)
ENDIF
END DO
END DO
RETURN
END SUBROUTINE DCAPECALC3D