source: trunk/src/gridcheck.f90 @ 4

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1!**********************************************************************
2! Copyright 1998,1999,2000,2001,2002,2005,2007,2008,2009,2010         *
3! Andreas Stohl, Petra Seibert, A. Frank, Gerhard Wotawa,             *
4! Caroline Forster, Sabine Eckhardt, John Burkhart, Harald Sodemann   *
5!                                                                     *
6! This file is part of FLEXPART.                                      *
7!                                                                     *
8! FLEXPART is free software: you can redistribute it and/or modify    *
9! it under the terms of the GNU General Public License as published by*
10! the Free Software Foundation, either version 3 of the License, or   *
11! (at your option) any later version.                                 *
12!                                                                     *
13! FLEXPART is distributed in the hope that it will be useful,         *
14! but WITHOUT ANY WARRANTY; without even the implied warranty of      *
15! MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the       *
16! GNU General Public License for more details.                        *
17!                                                                     *
18! You should have received a copy of the GNU General Public License   *
19! along with FLEXPART.  If not, see <http://www.gnu.org/licenses/>.   *
20!**********************************************************************
21
22subroutine gridcheck
23
24  !**********************************************************************
25  !                                                                     *
26  !             FLEXPART MODEL SUBROUTINE GRIDCHECK                     *
27  !                                                                     *
28  !**********************************************************************
29  !                                                                     *
30  !             AUTHOR:      G. WOTAWA                                  *
31  !             DATE:        1997-08-06                                 *
32  !             LAST UPDATE: 1997-10-10                                 *
33  !                                                                     *
34  !             Update:      1999-02-08, global fields allowed, A. Stohl*
35  !             CHANGE: 11/01/2008, Harald Sodemann, GRIB1/2 input with *
36  !                                 ECMWF grib_api                      *
37  !             CHANGE: 03/12/2008, Harald Sodemann, update to f90 with *
38  !                                 ECMWF grib_api                      *
39  !                                                                     *
40  !**********************************************************************
41  !                                                                     *
42  ! DESCRIPTION:                                                        *
43  !                                                                     *
44  ! THIS SUBROUTINE DETERMINES THE GRID SPECIFICATIONS (LOWER LEFT      *
45  ! LONGITUDE, LOWER LEFT LATITUDE, NUMBER OF GRID POINTS, GRID DIST-   *
46  ! ANCE AND VERTICAL DISCRETIZATION OF THE ECMWF MODEL) FROM THE       *
47  ! GRIB HEADER OF THE FIRST INPUT FILE. THE CONSISTANCY (NO CHANGES    *
48  ! WITHIN ONE FLEXPART RUN) IS CHECKED IN THE ROUTINE "READWIND" AT    *
49  ! ANY CALL.                                                           *
50  !                                                                     *
51  ! XLON0                geographical longitude of lower left gridpoint *
52  ! YLAT0                geographical latitude of lower left gridpoint  *
53  ! NX                   number of grid points x-direction              *
54  ! NY                   number of grid points y-direction              *
55  ! DX                   grid distance x-direction                      *
56  ! DY                   grid distance y-direction                      *
57  ! NUVZ                 number of grid points for horizontal wind      *
58  !                      components in z direction                      *
59  ! NWZ                  number of grid points for vertical wind        *
60  !                      component in z direction                       *
61  ! sizesouth, sizenorth give the map scale (i.e. number of virtual grid*
62  !                      points of the polar stereographic grid):       *
63  !                      used to check the CFL criterion                *
64  ! UVHEIGHT(1)-         heights of gridpoints where u and v are        *
65  ! UVHEIGHT(NUVZ)       given                                          *
66  ! WHEIGHT(1)-          heights of gridpoints where w is given         *
67  ! WHEIGHT(NWZ)                                                        *
68  !                                                                     *
69  !**********************************************************************
70
71  use grib_api
72  use par_mod
73  use com_mod
74  use conv_mod
75  use cmapf_mod, only: stlmbr,stcm2p
76
77  implicit none
78
79  !HSO  parameters for grib_api
80  integer :: ifile
81  integer :: iret
82  integer :: igrib
83  integer :: gotGrid
84  real(kind=4) :: xaux1,xaux2,yaux1,yaux2
85  real(kind=8) :: xaux1in,xaux2in,yaux1in,yaux2in
86  integer :: gribVer,parCat,parNum,typSurf,valSurf,discipl
87  !HSO  end
88  integer :: ix,jy,i,ifn,ifield,j,k,iumax,iwmax,numskip
89  real :: sizesouth,sizenorth,xauxa,pint
90
91  ! VARIABLES AND ARRAYS NEEDED FOR GRIB DECODING
92
93  ! dimension of isec2 at least (22+n), where n is the number of parallels or
94  ! meridians in a quasi-regular (reduced) Gaussian or lat/long grid
95
96  ! dimension of zsec2 at least (10+nn), where nn is the number of vertical
97  ! coordinate parameters
98
99  integer :: isec1(56),isec2(22+nxmax+nymax)
100  real(kind=4) :: zsec2(60+2*nuvzmax),zsec4(jpunp)
101  character(len=1) :: opt
102
103  !HSO  grib api error messages
104  character(len=24) :: gribErrorMsg = 'Error reading grib file'
105  character(len=20) :: gribFunction = 'gridcheck'
106
107  iumax=0
108  iwmax=0
109
110  if(ideltas.gt.0) then
111    ifn=1
112  else
113    ifn=numbwf
114  endif
115  !
116  ! OPENING OF DATA FILE (GRIB CODE)
117  !
1185   call grib_open_file(ifile,path(3)(1:length(3)) &
119         //trim(wfname(ifn)),'r',iret)
120  if (iret.ne.GRIB_SUCCESS) then
121    goto 999   ! ERROR DETECTED
122  endif
123  !turn on support for multi fields messages
124  !call grib_multi_support_on
125
126  gotGrid=0
127  ifield=0
12810   ifield=ifield+1
129
130  !
131  ! GET NEXT FIELDS
132  !
133  call grib_new_from_file(ifile,igrib,iret)
134  if (iret.eq.GRIB_END_OF_FILE )  then
135    goto 30    ! EOF DETECTED
136  elseif (iret.ne.GRIB_SUCCESS) then
137    goto 999   ! ERROR DETECTED
138  endif
139
140  !first see if we read GRIB1 or GRIB2
141  call grib_get_int(igrib,'editionNumber',gribVer,iret)
142  call grib_check(iret,gribFunction,gribErrorMsg)
143
144  if (gribVer.eq.1) then ! GRIB Edition 1
145
146  !print*,'GRiB Edition 1'
147  !read the grib2 identifiers
148  call grib_get_int(igrib,'indicatorOfParameter',isec1(6),iret)
149  call grib_check(iret,gribFunction,gribErrorMsg)
150  call grib_get_int(igrib,'level',isec1(8),iret)
151  call grib_check(iret,gribFunction,gribErrorMsg)
152
153  !change code for etadot to code for omega
154  if (isec1(6).eq.77) then
155    isec1(6)=135
156  endif
157
158  !print*,isec1(6),isec1(8)
159
160  else
161
162  !print*,'GRiB Edition 2'
163  !read the grib2 identifiers
164  call grib_get_int(igrib,'discipline',discipl,iret)
165  call grib_check(iret,gribFunction,gribErrorMsg)
166  call grib_get_int(igrib,'parameterCategory',parCat,iret)
167  call grib_check(iret,gribFunction,gribErrorMsg)
168  call grib_get_int(igrib,'parameterNumber',parNum,iret)
169  call grib_check(iret,gribFunction,gribErrorMsg)
170  call grib_get_int(igrib,'typeOfFirstFixedSurface',typSurf,iret)
171  call grib_check(iret,gribFunction,gribErrorMsg)
172  call grib_get_int(igrib,'level',valSurf,iret)
173  call grib_check(iret,gribFunction,gribErrorMsg)
174
175  !print*,discipl,parCat,parNum,typSurf,valSurf
176
177  !convert to grib1 identifiers
178  isec1(6)=-1
179  isec1(7)=-1
180  isec1(8)=-1
181  isec1(8)=valSurf     ! level
182  if ((parCat.eq.0).and.(parNum.eq.0).and.(typSurf.eq.105)) then ! T
183    isec1(6)=130         ! indicatorOfParameter
184  elseif ((parCat.eq.2).and.(parNum.eq.2).and.(typSurf.eq.105)) then ! U
185    isec1(6)=131         ! indicatorOfParameter
186  elseif ((parCat.eq.2).and.(parNum.eq.3).and.(typSurf.eq.105)) then ! V
187    isec1(6)=132         ! indicatorOfParameter
188  elseif ((parCat.eq.1).and.(parNum.eq.0).and.(typSurf.eq.105)) then ! Q
189    isec1(6)=133         ! indicatorOfParameter
190  elseif ((parCat.eq.3).and.(parNum.eq.0).and.(typSurf.eq.1)) then !SP
191    isec1(6)=134         ! indicatorOfParameter
192  elseif ((parCat.eq.2).and.(parNum.eq.32)) then ! W, actually eta dot
193    isec1(6)=135         ! indicatorOfParameter
194  elseif ((parCat.eq.3).and.(parNum.eq.0).and.(typSurf.eq.101)) then !SLP
195    isec1(6)=151         ! indicatorOfParameter
196  elseif ((parCat.eq.2).and.(parNum.eq.2).and.(typSurf.eq.103)) then ! 10U
197    isec1(6)=165         ! indicatorOfParameter
198  elseif ((parCat.eq.2).and.(parNum.eq.3).and.(typSurf.eq.103)) then ! 10V
199    isec1(6)=166         ! indicatorOfParameter
200  elseif ((parCat.eq.0).and.(parNum.eq.0).and.(typSurf.eq.103)) then ! 2T
201    isec1(6)=167         ! indicatorOfParameter
202  elseif ((parCat.eq.0).and.(parNum.eq.6).and.(typSurf.eq.103)) then ! 2D
203    isec1(6)=168         ! indicatorOfParameter
204  elseif ((parCat.eq.1).and.(parNum.eq.11).and.(typSurf.eq.1)) then ! SD
205    isec1(6)=141         ! indicatorOfParameter
206  elseif ((parCat.eq.6).and.(parNum.eq.1)) then ! CC
207    isec1(6)=164         ! indicatorOfParameter
208  elseif ((parCat.eq.1).and.(parNum.eq.9)) then ! LSP
209    isec1(6)=142         ! indicatorOfParameter
210  elseif ((parCat.eq.1).and.(parNum.eq.10)) then ! CP
211    isec1(6)=143         ! indicatorOfParameter
212  elseif ((parCat.eq.0).and.(parNum.eq.11).and.(typSurf.eq.1)) then ! SHF
213    isec1(6)=146         ! indicatorOfParameter
214  elseif ((parCat.eq.4).and.(parNum.eq.9).and.(typSurf.eq.1)) then ! SR
215    isec1(6)=176         ! indicatorOfParameter
216  elseif ((parCat.eq.2).and.(parNum.eq.17)) then ! EWSS
217    isec1(6)=180         ! indicatorOfParameter
218  elseif ((parCat.eq.2).and.(parNum.eq.18)) then ! NSSS
219    isec1(6)=181         ! indicatorOfParameter
220  elseif ((parCat.eq.3).and.(parNum.eq.4)) then ! ORO
221    isec1(6)=129         ! indicatorOfParameter
222  elseif ((parCat.eq.3).and.(parNum.eq.7)) then ! SDO
223    isec1(6)=160         ! indicatorOfParameter
224  elseif ((discipl.eq.2).and.(parCat.eq.0).and.(parNum.eq.0).and. &
225       (typSurf.eq.1)) then ! LSM
226    isec1(6)=172         ! indicatorOfParameter
227  else
228    print*,'***ERROR: undefined GRiB2 message found!',discipl, &
229         parCat,parNum,typSurf
230  endif
231
232  endif
233
234  !get the size and data of the values array
235  if (isec1(6).ne.-1) then
236    call grib_get_real4_array(igrib,'values',zsec4,iret)
237    call grib_check(iret,gribFunction,gribErrorMsg)
238  endif
239
240  if (ifield.eq.1) then
241
242  !HSO  get the required fields from section 2 in a gribex compatible manner
243    call grib_get_int(igrib,'numberOfPointsAlongAParallel', &
244         isec2(2),iret)
245    call grib_check(iret,gribFunction,gribErrorMsg)
246    call grib_get_int(igrib,'numberOfPointsAlongAMeridian', &
247         isec2(3),iret)
248    call grib_check(iret,gribFunction,gribErrorMsg)
249    call grib_get_real8(igrib,'longitudeOfFirstGridPointInDegrees', &
250         xaux1in,iret)
251    call grib_check(iret,gribFunction,gribErrorMsg)
252    call grib_get_int(igrib,'numberOfVerticalCoordinateValues', &
253         isec2(12),iret)
254    call grib_check(iret,gribFunction,gribErrorMsg)
255
256  !  get the size and data of the vertical coordinate array
257    call grib_get_real4_array(igrib,'pv',zsec2,iret)
258    call grib_check(iret,gribFunction,gribErrorMsg)
259
260    nxfield=isec2(2)
261    ny=isec2(3)
262    nlev_ec=isec2(12)/2-1
263   endif
264
265  !HSO  get the second part of the grid dimensions only from GRiB1 messages
266  if ((gribVer.eq.1).and.(gotGrid.eq.0)) then
267    call grib_get_real8(igrib,'longitudeOfLastGridPointInDegrees', &
268         xaux2in,iret)
269    call grib_check(iret,gribFunction,gribErrorMsg)
270    call grib_get_real8(igrib,'latitudeOfLastGridPointInDegrees', &
271         yaux1in,iret)
272    call grib_check(iret,gribFunction,gribErrorMsg)
273    call grib_get_real8(igrib,'latitudeOfFirstGridPointInDegrees', &
274         yaux2in,iret)
275    call grib_check(iret,gribFunction,gribErrorMsg)
276    xaux1=xaux1in
277    xaux2=xaux2in
278    yaux1=yaux1in
279    yaux2=yaux2in
280    if (xaux1.gt.180.) xaux1=xaux1-360.0
281    if (xaux2.gt.180.) xaux2=xaux2-360.0
282    if (xaux1.lt.-180.) xaux1=xaux1+360.0
283    if (xaux2.lt.-180.) xaux2=xaux2+360.0
284    if (xaux2.lt.xaux1) xaux2=xaux2+360.0
285    xlon0=xaux1
286    ylat0=yaux1
287    dx=(xaux2-xaux1)/real(nxfield-1)
288    dy=(yaux2-yaux1)/real(ny-1)
289    dxconst=180./(dx*r_earth*pi)
290    dyconst=180./(dy*r_earth*pi)
291    gotGrid=1
292
293  ! Check whether fields are global
294  ! If they contain the poles, specify polar stereographic map
295  ! projections using the stlmbr- and stcm2p-calls
296  !***********************************************************
297
298    xauxa=abs(xaux2+dx-360.-xaux1)
299    if (xauxa.lt.0.001) then
300      nx=nxfield+1                 ! field is cyclic
301      xglobal=.true.
302      if (abs(nxshift).ge.nx) &
303           stop 'nxshift in file par_mod is too large'
304      xlon0=xlon0+real(nxshift)*dx
305    else
306      nx=nxfield
307      xglobal=.false.
308      if (nxshift.ne.0) &
309           stop 'nxshift (par_mod) must be zero for non-global domain'
310    endif
311    nxmin1=nx-1
312    nymin1=ny-1
313    if (xlon0.gt.180.) xlon0=xlon0-360.
314    xauxa=abs(yaux1+90.)
315    if (xglobal.and.xauxa.lt.0.001) then
316      sglobal=.true.               ! field contains south pole
317  ! Enhance the map scale by factor 3 (*2=6) compared to north-south
318  ! map scale
319      sizesouth=6.*(switchsouth+90.)/dy
320      call stlmbr(southpolemap,-90.,0.)
321      call stcm2p(southpolemap,0.,0.,switchsouth,0.,sizesouth, &
322           sizesouth,switchsouth,180.)
323      switchsouthg=(switchsouth-ylat0)/dy
324    else
325      sglobal=.false.
326      switchsouthg=999999.
327    endif
328    xauxa=abs(yaux2-90.)
329    if (xglobal.and.xauxa.lt.0.001) then
330      nglobal=.true.               ! field contains north pole
331  ! Enhance the map scale by factor 3 (*2=6) compared to north-south
332  ! map scale
333      sizenorth=6.*(90.-switchnorth)/dy
334      call stlmbr(northpolemap,90.,0.)
335      call stcm2p(northpolemap,0.,0.,switchnorth,0.,sizenorth, &
336           sizenorth,switchnorth,180.)
337      switchnorthg=(switchnorth-ylat0)/dy
338    else
339      nglobal=.false.
340      switchnorthg=999999.
341    endif
342    if (nxshift.lt.0) &
343         stop 'nxshift (par_mod) must not be negative'
344    if (nxshift.ge.nxfield) stop 'nxshift (par_mod) too large'
345  endif ! gotGrid
346
347  k=isec1(8)
348  if(isec1(6).eq.131) iumax=max(iumax,nlev_ec-k+1)
349  if(isec1(6).eq.135) iwmax=max(iwmax,nlev_ec-k+1)
350
351  if(isec1(6).eq.129) then
352    do jy=0,ny-1
353      do ix=0,nxfield-1
354        oro(ix,jy)=zsec4(nxfield*(ny-jy-1)+ix+1)/ga
355      end do
356    end do
357  endif
358  if(isec1(6).eq.172) then
359    do jy=0,ny-1
360      do ix=0,nxfield-1
361        lsm(ix,jy)=zsec4(nxfield*(ny-jy-1)+ix+1)
362      end do
363    end do
364  endif
365  if(isec1(6).eq.160) then
366    do jy=0,ny-1
367      do ix=0,nxfield-1
368        excessoro(ix,jy)=zsec4(nxfield*(ny-jy-1)+ix+1)
369      end do
370    end do
371  endif
372
373  call grib_release(igrib)
374  goto 10                      !! READ NEXT LEVEL OR PARAMETER
375  !
376  ! CLOSING OF INPUT DATA FILE
377  !
378
37930   call grib_close_file(ifile)
380
381  !error message if no fields found with correct first longitude in it
382  if (gotGrid.eq.0) then
383    print*,'***ERROR: input file needs to contain GRiB1 formatted'// &
384         'messages'
385    stop
386  endif
387
388  nuvz=iumax
389  nwz =iwmax
390  if(nuvz.eq.nlev_ec) nwz=nlev_ec+1
391
392  if (nx.gt.nxmax) then
393   write(*,*) 'FLEXPART error: Too many grid points in x direction.'
394    write(*,*) 'Reduce resolution of wind fields.'
395    write(*,*) 'Or change parameter settings in file par_mod.'
396    write(*,*) nx,nxmax
397    stop
398  endif
399
400  if (ny.gt.nymax) then
401   write(*,*) 'FLEXPART error: Too many grid points in y direction.'
402    write(*,*) 'Reduce resolution of wind fields.'
403    write(*,*) 'Or change parameter settings in file par_mod.'
404    write(*,*) ny,nymax
405    stop
406  endif
407
408  if (nuvz+1.gt.nuvzmax) then
409    write(*,*) 'FLEXPART error: Too many u,v grid points in z '// &
410         'direction.'
411    write(*,*) 'Reduce resolution of wind fields.'
412    write(*,*) 'Or change parameter settings in file par_mod.'
413    write(*,*) nuvz+1,nuvzmax
414    stop
415  endif
416
417  if (nwz.gt.nwzmax) then
418    write(*,*) 'FLEXPART error: Too many w grid points in z '// &
419         'direction.'
420    write(*,*) 'Reduce resolution of wind fields.'
421    write(*,*) 'Or change parameter settings in file par_mod.'
422    write(*,*) nwz,nwzmax
423    stop
424  endif
425
426  ! If desired, shift all grids by nxshift grid cells
427  !**************************************************
428
429  if (xglobal) then
430    call shift_field_0(oro,nxfield,ny)
431    call shift_field_0(lsm,nxfield,ny)
432    call shift_field_0(excessoro,nxfield,ny)
433  endif
434
435  ! Output of grid info
436  !********************
437
438  write(*,*)
439  write(*,*)
440  write(*,'(a,2i7)') '# of vertical levels in ECMWF data: ', &
441       nuvz+1,nwz
442  write(*,*)
443  write(*,'(a)') 'Mother domain:'
444  write(*,'(a,f10.2,a1,f10.2,a,f10.2)') '  Longitude range: ', &
445       xlon0,' to ',xlon0+(nx-1)*dx,'   Grid distance: ',dx
446  write(*,'(a,f10.2,a1,f10.2,a,f10.2)') '  Latitude range: ', &
447       ylat0,' to ',ylat0+(ny-1)*dy,'   Grid distance: ',dy
448  write(*,*)
449
450
451  ! CALCULATE VERTICAL DISCRETIZATION OF ECMWF MODEL
452  ! PARAMETER akm,bkm DESCRIBE THE HYBRID "ETA" COORDINATE SYSTEM
453
454  numskip=nlev_ec-nuvz  ! number of ecmwf model layers not used
455                        ! by trajectory model
456  !do 8940 i=1,244
457  !   write (*,*) 'zsec2:',i,ifield,zsec2(i),numskip
458  !940  continue
459  !   stop
460  ! SEC SEC SEC
461  ! for unknown reason zsec 1 to 10 is filled in this version
462  ! compared to the old one
463  ! SEC SEC SE
464  do i=1,nwz
465    j=numskip+i
466    k=nlev_ec+1+numskip+i
467    akm(nwz-i+1)=zsec2(j)
468  !   write (*,*) 'ifield:',ifield,k,j,zsec2(10+j)
469    bkm(nwz-i+1)=zsec2(k)
470  end do
471
472  !
473  ! CALCULATION OF AKZ, BKZ
474  ! AKZ,BKZ: model discretization parameters at the center of each model
475  !     layer
476  !
477  ! Assign the 10 m winds to an artificial model level with akz=0 and bkz=1.0,
478  ! i.e. ground level
479  !*****************************************************************************
480
481  akz(1)=0.
482  bkz(1)=1.0
483  do i=1,nuvz
484     akz(i+1)=0.5*(akm(i+1)+akm(i))
485     bkz(i+1)=0.5*(bkm(i+1)+bkm(i))
486  end do
487  nuvz=nuvz+1
488
489  ! NOTE: In FLEXPART versions up to 4.0, the number of model levels was doubled
490  ! upon the transformation to z levels. In order to save computer memory, this is
491  ! not done anymore in the standard version. However, this option can still be
492  ! switched on by replacing the following lines with those below, that are
493  ! currently commented out. For this, similar changes are necessary in
494  ! verttransform.f and verttranform_nests.f
495  !*****************************************************************************
496
497  nz=nuvz
498  if (nz.gt.nzmax) stop 'nzmax too small'
499  do i=1,nuvz
500    aknew(i)=akz(i)
501    bknew(i)=bkz(i)
502  end do
503
504  ! Switch on following lines to use doubled vertical resolution
505  !*************************************************************
506  !nz=nuvz+nwz-1
507  !if (nz.gt.nzmax) stop 'nzmax too small'
508  !do 100 i=1,nwz
509  !  aknew(2*(i-1)+1)=akm(i)
510  !00     bknew(2*(i-1)+1)=bkm(i)
511  !do 110 i=2,nuvz
512  !  aknew(2*(i-1))=akz(i)
513  !10     bknew(2*(i-1))=bkz(i)
514  ! End doubled vertical resolution
515
516
517  ! Determine the uppermost level for which the convection scheme shall be applied
518  ! by assuming that there is no convection above 50 hPa (for standard SLP)
519  !*****************************************************************************
520
521  do i=1,nuvz-2
522    pint=akz(i)+bkz(i)*101325.
523    if (pint.lt.5000.) goto 96
524  end do
52596   nconvlev=i
526  if (nconvlev.gt.nconvlevmax-1) then
527    nconvlev=nconvlevmax-1
528    write(*,*) 'Attention, convection only calculated up to ', &
529         akz(nconvlev)+bkz(nconvlev)*1013.25,' hPa'
530  endif
531
532  return
533
534999   write(*,*)
535  write(*,*) ' ###########################################'// &
536       '###### '
537  write(*,*) '       TRAJECTORY MODEL SUBROUTINE GRIDCHECK:'
538  write(*,*) ' CAN NOT OPEN INPUT DATA FILE '//wfname(ifn)
539  write(*,*) ' ###########################################'// &
540       '###### '
541  write(*,*)
542  write(*,'(a)') '!!! PLEASE INSERT A NEW CD-ROM AND   !!!'
543  write(*,'(a)') '!!! PRESS ANY KEY TO CONTINUE...     !!!'
544  write(*,'(a)') '!!! ...OR TERMINATE FLEXPART PRESSING!!!'
545  write(*,'(a)') '!!! THE "X" KEY...                   !!!'
546  write(*,*)
547  read(*,'(a)') opt
548  if(opt.eq.'X') then
549    stop
550  else
551    goto 5
552  endif
553
554end subroutine gridcheck
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