| 1 | subroutine scops(npoints,nlev,ncol,seed,cc,conv, & |
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| 2 | overlap,frac_out,ncolprint) |
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| 3 | |
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| 4 | |
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| 5 | ! *****************************COPYRIGHT**************************** |
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| 6 | ! (c) British Crown Copyright 2009, the Met Office. |
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| 7 | ! All rights reserved. |
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| 8 | ! $Revision: 23 $, $Date: 2011-03-31 15:41:37 +0200 (jeu. 31 mars 2011) $ |
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| 9 | ! $URL: http://cfmip-obs-sim.googlecode.com/svn/stable/v1.4.0/icarus-scops-4.1-bsd/scops.f $ |
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| 10 | ! |
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| 11 | ! Redistribution and use in source and binary forms, with or without |
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| 12 | ! modification, are permitted provided that the |
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| 13 | ! following conditions are met: |
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| 14 | ! |
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| 15 | ! * Redistributions of source code must retain the above |
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| 16 | ! copyright notice, this list of conditions and the following |
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| 17 | ! disclaimer. |
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| 18 | ! * Redistributions in binary form must reproduce the above |
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| 19 | ! copyright notice, this list of conditions and the following |
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| 20 | ! disclaimer in the documentation and/or other materials |
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| 21 | ! provided with the distribution. |
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| 22 | ! * Neither the name of the Met Office nor the names of its |
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| 23 | ! contributors may be used to endorse or promote products |
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| 24 | ! derived from this software without specific prior written |
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| 25 | ! permission. |
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| 26 | ! |
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| 27 | ! THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
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| 28 | ! "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
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| 29 | ! LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
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| 30 | ! A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
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| 31 | ! OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
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| 32 | ! SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
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| 33 | ! LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
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| 34 | ! DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
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| 35 | ! THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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| 36 | ! (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
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| 37 | ! OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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| 38 | ! |
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| 39 | ! *****************************COPYRIGHT******************************* |
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| 40 | ! *****************************COPYRIGHT******************************* |
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| 41 | ! *****************************COPYRIGHT******************************* |
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| 42 | |
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| 43 | implicit none |
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| 44 | |
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| 45 | INTEGER :: npoints ! number of model points in the horizontal |
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| 46 | INTEGER :: nlev ! number of model levels in column |
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| 47 | INTEGER :: ncol ! number of subcolumns |
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| 48 | |
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| 49 | |
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| 50 | INTEGER :: overlap ! overlap type |
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| 51 | ! ! 1=max |
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| 52 | ! ! 2=rand |
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| 53 | ! ! 3=max/rand |
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| 54 | REAL :: cc(npoints,nlev) |
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| 55 | ! ! input cloud cover in each model level (fraction) |
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| 56 | ! ! NOTE: This is the HORIZONTAL area of each |
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| 57 | ! ! grid box covered by clouds |
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| 58 | |
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| 59 | REAL :: conv(npoints,nlev) |
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| 60 | ! ! input convective cloud cover in each model |
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| 61 | ! ! level (fraction) |
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| 62 | ! ! NOTE: This is the HORIZONTAL area of each |
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| 63 | ! ! grid box covered by convective clouds |
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| 64 | |
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| 65 | INTEGER :: i,j,ilev,ibox,ncolprint,ilev2 |
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| 66 | |
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| 67 | REAL :: frac_out(npoints,ncol,nlev) ! boxes gridbox divided up into |
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| 68 | ! ! Equivalent of BOX in original version, but |
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| 69 | ! ! indexed by column then row, rather than |
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| 70 | ! ! by row then column |
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| 71 | |
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| 72 | |
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| 73 | INTEGER :: seed(npoints) |
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| 74 | ! ! seed values for marsaglia random number generator |
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| 75 | ! ! It is recommended that the seed is set |
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| 76 | ! ! to a different value for each model |
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| 77 | ! ! gridbox it is called on, as it is |
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| 78 | ! ! possible that the choice of the same |
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| 79 | ! ! seed value every time may introduce some |
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| 80 | ! ! statistical bias in the results, particularly |
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| 81 | ! ! for low values of NCOL. |
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| 82 | |
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| 83 | REAL :: tca(npoints,0:nlev) ! total cloud cover in each model level (fraction) |
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| 84 | ! ! with extra layer of zeroes on top |
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| 85 | ! ! in this version this just contains the values input |
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| 86 | ! ! from cc but with an extra level |
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| 87 | |
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| 88 | REAL :: threshold(npoints,ncol) ! pointer to position in gridbox |
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| 89 | REAL :: maxocc(npoints,ncol) ! Flag for max overlapped conv cld |
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| 90 | REAL :: maxosc(npoints,ncol) ! Flag for max overlapped strat cld |
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| 91 | |
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| 92 | REAL :: boxpos(npoints,ncol) ! ordered pointer to position in gridbox |
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| 93 | |
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| 94 | REAL :: threshold_min(npoints,ncol) ! minimum value to define range in with new threshold |
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| 95 | ! ! is chosen |
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| 96 | |
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| 97 | REAL :: ran(npoints) ! vector of random numbers |
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| 98 | |
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| 99 | INTEGER :: irand,i2_16,huge32,overflow_32 ! variables for RNG |
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| 100 | PARAMETER(huge32=2147483647) |
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| 101 | i2_16=65536 |
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| 102 | |
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| 103 | do ibox=1,ncol |
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| 104 | do j=1,npoints |
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| 105 | boxpos(j,ibox)=(ibox-.5)/ncol |
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| 106 | enddo |
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| 107 | enddo |
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| 108 | |
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| 109 | ! ---------------------------------------------------! |
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| 110 | ! Initialise working variables |
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| 111 | ! ---------------------------------------------------! |
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| 112 | |
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| 113 | ! Initialised frac_out to zero |
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| 114 | |
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| 115 | do ilev=1,nlev |
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| 116 | do ibox=1,ncol |
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| 117 | do j=1,npoints |
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| 118 | frac_out(j,ibox,ilev)=0.0 |
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| 119 | enddo |
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| 120 | enddo |
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| 121 | enddo |
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| 122 | |
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| 123 | ! assign 2d tca array using 1d input array cc |
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| 124 | |
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| 125 | do j=1,npoints |
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| 126 | tca(j,0)=0 |
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| 127 | enddo |
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| 128 | |
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| 129 | do ilev=1,nlev |
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| 130 | do j=1,npoints |
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| 131 | tca(j,ilev)=cc(j,ilev) |
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| 132 | enddo |
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| 133 | enddo |
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| 134 | |
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| 135 | if (ncolprint.ne.0) then |
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| 136 | write (6,'(a)') 'frac_out_pp_rev:' |
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| 137 | do j=1,npoints,1000 |
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| 138 | write(6,'(a10)') 'j=' |
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| 139 | write(6,'(8I10)') j |
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| 140 | write (6,'(8f5.2)') & |
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| 141 | ((frac_out(j,ibox,ilev),ibox=1,ncolprint),ilev=1,nlev) |
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| 142 | |
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| 143 | enddo |
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| 144 | write (6,'(a)') 'ncol:' |
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| 145 | write (6,'(I3)') ncol |
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| 146 | endif |
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| 147 | if (ncolprint.ne.0) then |
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| 148 | write (6,'(a)') 'last_frac_pp:' |
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| 149 | do j=1,npoints,1000 |
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| 150 | write(6,'(a10)') 'j=' |
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| 151 | write(6,'(8I10)') j |
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| 152 | write (6,'(8f5.2)') (tca(j,0)) |
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| 153 | enddo |
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| 154 | endif |
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| 155 | |
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| 156 | ! ---------------------------------------------------! |
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| 157 | ! ALLOCATE CLOUD INTO BOXES, FOR NCOLUMNS, NLEVELS |
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| 158 | ! frac_out is the array that contains the information |
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| 159 | ! where 0 is no cloud, 1 is a stratiform cloud and 2 is a |
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| 160 | ! convective cloud |
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| 161 | |
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| 162 | ! !loop over vertical levels |
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| 163 | DO ilev = 1,nlev |
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| 164 | |
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| 165 | ! Initialise threshold |
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| 166 | |
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| 167 | IF (ilev.eq.1) then |
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| 168 | ! ! If max overlap |
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| 169 | IF (overlap.eq.1) then |
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| 170 | ! ! select pixels spread evenly |
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| 171 | ! ! across the gridbox |
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| 172 | DO ibox=1,ncol |
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| 173 | do j=1,npoints |
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| 174 | threshold(j,ibox)=boxpos(j,ibox) |
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| 175 | enddo |
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| 176 | enddo |
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| 177 | ELSE |
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| 178 | DO ibox=1,ncol |
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| 179 | include 'congvec.h' |
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| 180 | ! ! select random pixels from the non-convective |
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| 181 | ! ! part the gridbox ( some will be converted into |
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| 182 | ! ! convective pixels below ) |
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| 183 | do j=1,npoints |
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| 184 | threshold(j,ibox)= & |
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| 185 | conv(j,ilev)+(1-conv(j,ilev))*ran(j) |
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| 186 | enddo |
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| 187 | enddo |
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| 188 | ENDIF |
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| 189 | IF (ncolprint.ne.0) then |
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| 190 | write (6,'(a)') 'threshold_nsf2:' |
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| 191 | do j=1,npoints,1000 |
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| 192 | write(6,'(a10)') 'j=' |
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| 193 | write(6,'(8I10)') j |
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| 194 | write (6,'(8f5.2)') (threshold(j,ibox),ibox=1,ncolprint) |
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| 195 | enddo |
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| 196 | ENDIF |
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| 197 | ENDIF |
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| 198 | |
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| 199 | IF (ncolprint.ne.0) then |
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| 200 | write (6,'(a)') 'ilev:' |
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| 201 | write (6,'(I2)') ilev |
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| 202 | ENDIF |
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| 203 | |
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| 204 | DO ibox=1,ncol |
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| 205 | |
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| 206 | ! ! All versions |
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| 207 | do j=1,npoints |
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| 208 | if (boxpos(j,ibox).le.conv(j,ilev)) then |
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| 209 | maxocc(j,ibox) = 1 |
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| 210 | else |
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| 211 | maxocc(j,ibox) = 0 |
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| 212 | end if |
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| 213 | enddo |
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| 214 | |
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| 215 | ! ! Max overlap |
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| 216 | if (overlap.eq.1) then |
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| 217 | do j=1,npoints |
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| 218 | threshold_min(j,ibox)=conv(j,ilev) |
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| 219 | maxosc(j,ibox)=1 |
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| 220 | enddo |
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| 221 | endif |
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| 222 | |
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| 223 | ! ! Random overlap |
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| 224 | if (overlap.eq.2) then |
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| 225 | do j=1,npoints |
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| 226 | threshold_min(j,ibox)=conv(j,ilev) |
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| 227 | maxosc(j,ibox)=0 |
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| 228 | enddo |
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| 229 | endif |
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| 230 | |
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| 231 | ! ! Max/Random overlap |
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| 232 | if (overlap.eq.3) then |
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| 233 | do j=1,npoints |
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| 234 | threshold_min(j,ibox)=max(conv(j,ilev), & |
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| 235 | min(tca(j,ilev-1),tca(j,ilev))) |
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| 236 | if (threshold(j,ibox) & |
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| 237 | .lt.min(tca(j,ilev-1),tca(j,ilev)) & |
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| 238 | .and.(threshold(j,ibox).gt.conv(j,ilev))) then |
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| 239 | maxosc(j,ibox)= 1 |
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| 240 | else |
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| 241 | maxosc(j,ibox)= 0 |
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| 242 | end if |
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| 243 | enddo |
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| 244 | endif |
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| 245 | |
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| 246 | ! ! Reset threshold |
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| 247 | |
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| 248 | include 'congvec.h' |
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| 249 | |
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| 250 | do j=1,npoints |
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| 251 | threshold(j,ibox)= & |
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| 252 | ! !if max overlapped conv cloud |
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| 253 | maxocc(j,ibox) * ( & |
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| 254 | boxpos(j,ibox) & |
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| 255 | ) + & |
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| 256 | ! !else |
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| 257 | (1-maxocc(j,ibox)) * ( & |
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| 258 | ! !if max overlapped strat cloud |
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| 259 | (maxosc(j,ibox)) * ( & |
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| 260 | ! !threshold=boxpos |
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| 261 | threshold(j,ibox) & |
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| 262 | ) + & |
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| 263 | ! !else |
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| 264 | (1-maxosc(j,ibox)) * ( & |
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| 265 | ! !threshold_min=random[thrmin,1] |
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| 266 | threshold_min(j,ibox)+ & |
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| 267 | (1-threshold_min(j,ibox))*ran(j) & |
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| 268 | ) & |
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| 269 | ) |
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| 270 | enddo |
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| 271 | |
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| 272 | ENDDO ! ibox |
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| 273 | |
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| 274 | ! Fill frac_out with 1's where tca is greater than the threshold |
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| 275 | |
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| 276 | DO ibox=1,ncol |
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| 277 | do j=1,npoints |
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| 278 | if (tca(j,ilev).gt.threshold(j,ibox)) then |
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| 279 | frac_out(j,ibox,ilev)=1 |
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| 280 | else |
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| 281 | frac_out(j,ibox,ilev)=0 |
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| 282 | end if |
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| 283 | enddo |
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| 284 | ENDDO |
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| 285 | |
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| 286 | ! Code to partition boxes into startiform and convective parts |
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| 287 | ! goes here |
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| 288 | |
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| 289 | DO ibox=1,ncol |
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| 290 | do j=1,npoints |
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| 291 | if (threshold(j,ibox).le.conv(j,ilev)) then |
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| 292 | ! ! = 2 IF threshold le conv(j) |
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| 293 | frac_out(j,ibox,ilev) = 2 |
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| 294 | else |
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| 295 | ! ! = the same IF NOT threshold le conv(j) |
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| 296 | frac_out(j,ibox,ilev) = frac_out(j,ibox,ilev) |
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| 297 | end if |
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| 298 | enddo |
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| 299 | ENDDO |
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| 300 | |
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| 301 | ! Set last_frac to tca at this level, so as to be tca |
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| 302 | ! from last level next time round |
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| 303 | |
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| 304 | if (ncolprint.ne.0) then |
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| 305 | |
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| 306 | do j=1,npoints ,1000 |
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| 307 | write(6,'(a10)') 'j=' |
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| 308 | write(6,'(8I10)') j |
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| 309 | write (6,'(a)') 'last_frac:' |
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| 310 | write (6,'(8f5.2)') (tca(j,ilev-1)) |
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| 311 | |
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| 312 | write (6,'(a)') 'conv:' |
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| 313 | write (6,'(8f5.2)') (conv(j,ilev),ibox=1,ncolprint) |
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| 314 | |
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| 315 | write (6,'(a)') 'max_overlap_cc:' |
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| 316 | write (6,'(8f5.2)') (maxocc(j,ibox),ibox=1,ncolprint) |
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| 317 | |
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| 318 | write (6,'(a)') 'max_overlap_sc:' |
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| 319 | write (6,'(8f5.2)') (maxosc(j,ibox),ibox=1,ncolprint) |
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| 320 | |
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| 321 | write (6,'(a)') 'threshold_min_nsf2:' |
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| 322 | write (6,'(8f5.2)') (threshold_min(j,ibox),ibox=1,ncolprint) |
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| 323 | |
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| 324 | write (6,'(a)') 'threshold_nsf2:' |
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| 325 | write (6,'(8f5.2)') (threshold(j,ibox),ibox=1,ncolprint) |
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| 326 | |
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| 327 | write (6,'(a)') 'frac_out_pp_rev:' |
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| 328 | write (6,'(8f5.2)') & |
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| 329 | ((frac_out(j,ibox,ilev2),ibox=1,ncolprint),ilev2=1,nlev) |
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| 330 | enddo |
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| 331 | endif |
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| 332 | |
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| 333 | END DO |
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| 334 | |
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| 335 | |
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| 336 | end subroutine scops |
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| 337 | |
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