source: trunk/src/gridcheck_fnl.f90 @ 20

Last change on this file since 20 was 20, checked in by igpis, 9 years ago

move version 9.1.8 form branches to trunk. Contributions from HSO, saeck, pesei, NIK, RT, XKF, IP and others

File size: 18.8 KB
RevLine 
[20]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: 17/11/2005, Caroline Forster, GFS data          *
36  !             CHANGE: 11/01/2008, Harald Sodemann, GRIB1/2 input with *
37  !                                 ECMWF grib_api                      *
38  !             CHANGE: 03/12/2008, Harald Sodemann, update to f90 with *
39  !                                 ECMWF grib_api                      *
40  !                                                                     *
41  !**********************************************************************
42  !                                                                     *
43  ! DESCRIPTION:                                                        *
44  !                                                                     *
45  ! THIS SUBROUTINE DETERMINES THE GRID SPECIFICATIONS (LOWER LEFT      *
46  ! LONGITUDE, LOWER LEFT LATITUDE, NUMBER OF GRID POINTS, GRID DIST-   *
47  ! ANCE AND VERTICAL DISCRETIZATION OF THE ECMWF MODEL) FROM THE       *
48  ! GRIB HEADER OF THE FIRST INPUT FILE. THE CONSISTANCY (NO CHANGES    *
49  ! WITHIN ONE FLEXPART RUN) IS CHECKED IN THE ROUTINE "READWIND" AT    *
50  ! ANY CALL.                                                           *
51  !                                                                     *
52  ! XLON0                geographical longitude of lower left gridpoint *
53  ! YLAT0                geographical latitude of lower left gridpoint  *
54  ! NX                   number of grid points x-direction              *
55  ! NY                   number of grid points y-direction              *
56  ! DX                   grid distance x-direction                      *
57  ! DY                   grid distance y-direction                      *
58  ! NUVZ                 number of grid points for horizontal wind      *
59  !                      components in z direction                      *
60  ! NWZ                  number of grid points for vertical wind        *
61  !                      component in z direction                       *
62  ! sizesouth, sizenorth give the map scale (i.e. number of virtual grid*
63  !                      points of the polar stereographic grid):       *
64  !                      used to check the CFL criterion                *
65  ! VHEIGHT(1)-         heights of gridpoints where u and v are        *
66  ! UVHEIGHT(NUVZ)       given                                          *
67  ! WHEIGHT(1)-          heights of gridpoints where w is given         *
68  ! WHEIGHT(NWZ)                                                        *
69  !                                                                     *
70  !**********************************************************************
71
72  use grib_api
73  use par_mod
74  use com_mod
75  use conv_mod
76  use cmapf_mod, only: stlmbr,stcm2p
77
78  implicit none
79
80  !HSO  parameters for grib_api
81  integer :: ifile
82  integer :: iret
83  integer :: igrib
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  real :: akm_usort(nwzmax)
91  real,parameter :: eps=0.0001
92
93  ! NCEP GFS
94  real :: pres(nwzmax), help
95
96  integer :: i179,i180,i181
97
98  ! VARIABLES AND ARRAYS NEEDED FOR GRIB DECODING
99
100  integer :: isec1(8),isec2(3)
101  real(kind=4) :: zsec4(jpunp)
102  character(len=1) :: opt
103
104  !HSO  grib api error messages
105  character(len=24) :: gribErrorMsg = 'Error reading grib file'
106  character(len=20) :: gribFunction = 'gridcheckwind_gfs'
107  !
108  if (numbnests.ge.1) then
109  write(*,*) ' ###########################################'
110  write(*,*) ' FLEXPART ERROR SUBROUTINE GRIDCHECK:'
111  write(*,*) ' NO NESTED WINDFIELDAS ALLOWED FOR GFS!      '
112  write(*,*) ' ###########################################'
113  stop
114  endif
115
116  iumax=0
117  iwmax=0
118
119  if(ideltas.gt.0) then
120    ifn=1
121  else
122    ifn=numbwf
123  endif
124  !
125  ! OPENING OF DATA FILE (GRIB CODE)
126  !
1275   call grib_open_file(ifile,path(3)(1:length(3)) &
128         //trim(wfname(ifn)),'r',iret)
129  if (iret.ne.GRIB_SUCCESS) then
130    goto 999   ! ERROR DETECTED
131  endif
132  !turn on support for multi fields messages
133  call grib_multi_support_on
134
135  ifield=0
13610   ifield=ifield+1
137  !
138  ! GET NEXT FIELDS
139  !
140  call grib_new_from_file(ifile,igrib,iret)
141  if (iret.eq.GRIB_END_OF_FILE )  then
142    goto 30    ! EOF DETECTED
143  elseif (iret.ne.GRIB_SUCCESS) then
144    goto 999   ! ERROR DETECTED
145  endif
146
147  !first see if we read GRIB1 or GRIB2
148  call grib_get_int(igrib,'editionNumber',gribVer,iret)
149  call grib_check(iret,gribFunction,gribErrorMsg)
150
151  if (gribVer.eq.1) then ! GRIB Edition 1
152
153  !read the grib1 identifiers
154  call grib_get_int(igrib,'indicatorOfParameter',isec1(6),iret)
155  call grib_check(iret,gribFunction,gribErrorMsg)
156  call grib_get_int(igrib,'indicatorOfTypeOfLevel',isec1(7),iret)
157  call grib_check(iret,gribFunction,gribErrorMsg)
158  call grib_get_int(igrib,'level',isec1(8),iret)
159  call grib_check(iret,gribFunction,gribErrorMsg)
160
161  !get the size and data of the values array
162  call grib_get_real4_array(igrib,'values',zsec4,iret)
163  call grib_check(iret,gribFunction,gribErrorMsg)
164
165  else ! GRIB Edition 2
166
167  !read the grib2 identifiers
168  call grib_get_int(igrib,'discipline',discipl,iret)
169  call grib_check(iret,gribFunction,gribErrorMsg)
170  call grib_get_int(igrib,'parameterCategory',parCat,iret)
171  call grib_check(iret,gribFunction,gribErrorMsg)
172  call grib_get_int(igrib,'parameterNumber',parNum,iret)
173  call grib_check(iret,gribFunction,gribErrorMsg)
174  call grib_get_int(igrib,'typeOfFirstFixedSurface',typSurf,iret)
175  call grib_check(iret,gribFunction,gribErrorMsg)
176  call grib_get_int(igrib,'scaledValueOfFirstFixedSurface', &
177       valSurf,iret)
178  call grib_check(iret,gribFunction,gribErrorMsg)
179
180  !convert to grib1 identifiers
181  isec1(6)=-1
182  isec1(7)=-1
183  isec1(8)=-1
184  if ((parCat.eq.2).and.(parNum.eq.2).and.(typSurf.eq.100)) then ! U
185    isec1(6)=33          ! indicatorOfParameter
186    isec1(7)=100         ! indicatorOfTypeOfLevel
187    isec1(8)=valSurf/100 ! level, convert to hPa
188  elseif ((parCat.eq.3).and.(parNum.eq.5).and.(typSurf.eq.1)) then ! TOPO
189    isec1(6)=7           ! indicatorOfParameter
190    isec1(7)=1           ! indicatorOfTypeOfLevel
191    isec1(8)=0
192  elseif ((parCat.eq.0).and.(parNum.eq.0).and.(typSurf.eq.1) &
193       .and.(discipl.eq.2)) then ! LSM
194    isec1(6)=81          ! indicatorOfParameter
195    isec1(7)=1           ! indicatorOfTypeOfLevel
196    isec1(8)=0
197  endif
198
199  if (isec1(6).ne.-1) then
200  !  get the size and data of the values array
201    call grib_get_real4_array(igrib,'values',zsec4,iret)
202    call grib_check(iret,gribFunction,gribErrorMsg)
203  endif
204
205  endif ! gribVer
206
207  if(ifield.eq.1) then
208
209  !get the required fields from section 2
210  !store compatible to gribex input
211  call grib_get_int(igrib,'numberOfPointsAlongAParallel', &
212       isec2(2),iret)
213  call grib_check(iret,gribFunction,gribErrorMsg)
214  call grib_get_int(igrib,'numberOfPointsAlongAMeridian', &
215       isec2(3),iret)
216  call grib_check(iret,gribFunction,gribErrorMsg)
217  call grib_get_real8(igrib,'longitudeOfFirstGridPointInDegrees', &
218       xaux1in,iret)
219  call grib_check(iret,gribFunction,gribErrorMsg)
220  call grib_get_real8(igrib,'longitudeOfLastGridPointInDegrees', &
221       xaux2in,iret)
222  call grib_check(iret,gribFunction,gribErrorMsg)
223  call grib_get_real8(igrib,'latitudeOfLastGridPointInDegrees', &
224       yaux1in,iret)
225  call grib_check(iret,gribFunction,gribErrorMsg)
226  call grib_get_real8(igrib,'latitudeOfFirstGridPointInDegrees', &
227       yaux2in,iret)
228  call grib_check(iret,gribFunction,gribErrorMsg)
229
230  xaux1=xaux1in
231!  xaux2=xaux2in
232  xaux2=xaux2in+360.    !!! Transform FNL xauu2in from -1 to 359 (Xuekue Fang, 31 Jan 2013)
233  yaux1=yaux1in
234  yaux2=yaux2in
235  write(*,*) 'xaux1,xaux2,yaux1,yaux2',xaux1,xaux2,yaux1,yaux2
236  nxfield=isec2(2)
237  ny=isec2(3)
238
239 
240
241  if((abs(xaux1).lt.eps).and.(xaux2.ge.359)) then ! NCEP DATA FROM 0 TO
242    xaux1=-179.0                             ! 359 DEG EAST ->
243    xaux2=-179.0+360.-360./real(nxfield)    ! TRANSFORMED TO -179
244  endif                                      ! TO 180 DEG EAST
245  if (xaux1.gt.180) xaux1=xaux1-360.0
246  if (xaux2.gt.180) xaux2=xaux2-360.0
247  if (xaux1.lt.-180) xaux1=xaux1+360.0
248  if (xaux2.lt.-180) xaux2=xaux2+360.0
249  if (xaux2.lt.xaux1) xaux2=xaux2+360.
250  xlon0=xaux1
251  ylat0=yaux1
252  write(*,*) 'xlon0,ylat0',xlon0,ylat0
253
254  dx=(xaux2-xaux1)/real(nxfield-1)
255  dy=(yaux2-yaux1)/real(ny-1)
256  dxconst=180./(dx*r_earth*pi)
257  dyconst=180./(dy*r_earth*pi)
258  write(*,*) 'dx,dy,dxconst,dyconst',dx,dy,dxconst,dyconst
259  !HSO end edits
260
261
262  ! Check whether fields are global
263  ! If they contain the poles, specify polar stereographic map
264  ! projections using the stlmbr- and stcm2p-calls
265  !***********************************************************
266
267    xauxa=abs(xaux2+dx-360.-xaux1)
268    if (xauxa.lt.0.001) then
269      nx=nxfield+1                 ! field is cyclic
270      xglobal=.true.
271      if (abs(nxshift).ge.nx) &
272           stop 'nxshift in file par_mod is too large'
273      xlon0=xlon0+real(nxshift)*dx
274    else
275      nx=nxfield
276      xglobal=.false.
277      if (nxshift.ne.0) &
278           stop 'nxshift (par_mod) must be zero for non-global domain'
279    endif
280    nxmin1=nx-1
281    nymin1=ny-1
282    if (xlon0.gt.180.) xlon0=xlon0-360.
283    xauxa=abs(yaux1+90.)
284    if (xglobal.and.xauxa.lt.0.001) then
285      sglobal=.true.               ! field contains south pole
286  ! Enhance the map scale by factor 3 (*2=6) compared to north-south
287  ! map scale
288      sizesouth=6.*(switchsouth+90.)/dy
289      call stlmbr(southpolemap,-90.,0.)
290      call stcm2p(southpolemap,0.,0.,switchsouth,0.,sizesouth, &
291           sizesouth,switchsouth,180.)
292      switchsouthg=(switchsouth-ylat0)/dy
293    else
294      sglobal=.false.
295      switchsouthg=999999.
296    endif
297    xauxa=abs(yaux2-90.)
298    if (xglobal.and.xauxa.lt.0.001) then
299      nglobal=.true.               ! field contains north pole
300  ! Enhance the map scale by factor 3 (*2=6) compared to north-south
301  ! map scale
302      sizenorth=6.*(90.-switchnorth)/dy
303      call stlmbr(northpolemap,90.,0.)
304      call stcm2p(northpolemap,0.,0.,switchnorth,0.,sizenorth, &
305           sizenorth,switchnorth,180.)
306      switchnorthg=(switchnorth-ylat0)/dy
307    else
308      nglobal=.false.
309      switchnorthg=999999.
310    endif
311  endif ! ifield.eq.1
312
313  if (nxshift.lt.0) stop 'nxshift (par_mod) must not be negative'
314  if (nxshift.ge.nxfield) stop 'nxshift (par_mod) too large'
315
316  ! NCEP ISOBARIC LEVELS
317  !*********************
318
319  if((isec1(6).eq.33).and.(isec1(7).eq.100)) then ! check for U wind
320    iumax=iumax+1
321    pres(iumax)=real(isec1(8))*100.0
322  endif
323
324
325  i179=nint(179./dx)
326  if (dx.lt.0.7) then
327    i180=nint(180./dx)+1    ! 0.5 deg data
328  else
329    i180=nint(179./dx)+1    ! 1 deg data
330  endif
331  i181=i180+1
332
333
334  ! NCEP TERRAIN
335  !*************
336
337  if((isec1(6).eq.007).and.(isec1(7).eq.001)) then
338    do jy=0,ny-1
339      do ix=0,nxfield-1
340        help=zsec4(nxfield*(ny-jy-1)+ix+1)
341        if(ix.le.i180) then
342          oro(i179+ix,jy)=help
343          excessoro(i179+ix,jy)=0.0 ! ISOBARIC SURFACES: SUBGRID TERRAIN DISREGARDED
344        else
345          oro(ix-i181,jy)=help
346          excessoro(ix-i181,jy)=0.0 ! ISOBARIC SURFACES: SUBGRID TERRAIN DISREGARDED
347        endif
348      end do
349    end do
350  endif
351
352  ! NCEP LAND SEA MASK
353  !*******************
354
355  if((isec1(6).eq.081).and.(isec1(7).eq.001)) then
356    do jy=0,ny-1
357      do ix=0,nxfield-1
358        help=zsec4(nxfield*(ny-jy-1)+ix+1)
359        if(ix.le.i180) then
360          lsm(i179+ix,jy)=help
361        else
362          lsm(ix-i181,jy)=help
363        endif
364      end do
365    end do
366  endif
367
368  call grib_release(igrib)
369
370  goto 10                      !! READ NEXT LEVEL OR PARAMETER
371  !
372  ! CLOSING OF INPUT DATA FILE
373  !
374
375  ! HSO
37630   continue
377  call grib_close_file(ifile)
378  ! HSO end edits
379
380  nuvz=iumax
381  nwz =iumax
382  nlev_ec=iumax
383
384  if (nx.gt.nxmax) then
385   write(*,*) 'FLEXPART error: Too many grid points in x direction.'
386    write(*,*) 'Reduce resolution of wind fields.'
387    write(*,*) 'Or change parameter settings in file par_mod.'
388    write(*,*) nx,nxmax
389    stop
390  endif
391
392  if (ny.gt.nymax) then
393   write(*,*) 'FLEXPART error: Too many grid points in y direction.'
394    write(*,*) 'Reduce resolution of wind fields.'
395    write(*,*) 'Or change parameter settings in file par_mod.'
396    write(*,*) ny,nymax
397    stop
398  endif
399
400  if (nuvz.gt.nuvzmax) then
401    write(*,*) 'FLEXPART error: Too many u,v grid points in z '// &
402         'direction.'
403    write(*,*) 'Reduce resolution of wind fields.'
404    write(*,*) 'Or change parameter settings in file par_mod.'
405    write(*,*) nuvz,nuvzmax
406    stop
407  endif
408
409  if (nwz.gt.nwzmax) then
410    write(*,*) 'FLEXPART error: Too many w grid points in z '// &
411         'direction.'
412    write(*,*) 'Reduce resolution of wind fields.'
413    write(*,*) 'Or change parameter settings in file par_mod.'
414    write(*,*) nwz,nwzmax
415    stop
416  endif
417
418  ! If desired, shift all grids by nxshift grid cells
419  !**************************************************
420
421  if (xglobal) then
422    call shift_field_0(oro,nxfield,ny)
423    call shift_field_0(lsm,nxfield,ny)
424    call shift_field_0(excessoro,nxfield,ny)
425  endif
426
427  ! Output of grid info
428  !********************
429
430  write(*,*)
431  write(*,*)
432  write(*,'(a,2i7)') '# of vertical levels in NCEP data: ', &
433       nuvz,nwz
434  write(*,*)
435  write(*,'(a)') 'other domain:'
436  write(*,'(a,f10.2,a1,f10.2,a,f10.2)') '  Longitude range: ', &
437       xlon0,' to ',xlon0+(nx-1)*dx,'   Grid distance: ',dx
438  write(*,'(a,f10.2,a1,f10.2,a,f10.2)') '  Latitude range: ', &
439       ylat0,' to ',ylat0+(ny-1)*dy,'   Grid distance: ',dy
440  write(*,*)
441
442
443  ! CALCULATE VERTICAL DISCRETIZATION OF ECMWF MODEL
444  ! PARAMETER akm,bkm DESCRIBE THE HYBRID "ETA" COORDINATE SYSTEM
445
446  numskip=nlev_ec-nuvz  ! number of ecmwf model layers not used
447                        ! by trajectory model
448  do i=1,nwz
449    j=numskip+i
450    k=nlev_ec+1+numskip+i
451    akm_usort(nwz-i+1)=pres(nwz-i+1)
452    bkm(nwz-i+1)=0.0
453  end do
454
455  !******************************
456  ! change Sabine Eckhardt: akm should always be in descending order ... readwind adapted!
457  !******************************
458      do i=1,nwz
459         if (akm_usort(1).gt.akm_usort(2)) then
460            akm(i)=akm_usort(i)
461         else
462            akm(i)=akm_usort(nwz-i+1)
463         endif
464      end do
465
466  !
467  ! CALCULATION OF AKZ, BKZ
468  ! AKZ,BKZ: model discretization parameters at the center of each model
469  !     layer
470  !
471  ! Assign the 10 m winds to an artificial model level with akz=0 and bkz=1.0,
472  ! i.e. ground level
473  !*****************************************************************************
474
475  do i=1,nuvz
476     akz(i)=akm(i)
477     bkz(i)=bkm(i)
478  end do
479
480  ! NOTE: In FLEXPART versions up to 4.0, the number of model levels was doubled
481  ! upon the transformation to z levels. In order to save computer memory, this is
482  ! not done anymore in the standard version. However, this option can still be
483  ! switched on by replacing the following lines with those below, that are
484  ! currently commented out. For this, similar changes are necessary in
485  ! verttransform.f and verttranform_nests.f
486  !*****************************************************************************
487
488  nz=nuvz
489  if (nz.gt.nzmax) stop 'nzmax too small'
490  do i=1,nuvz
491    aknew(i)=akz(i)
492    bknew(i)=bkz(i)
493  end do
494
495  ! Switch on following lines to use doubled vertical resolution
496  !*************************************************************
497  !nz=nuvz+nwz-1
498  !if (nz.gt.nzmax) stop 'nzmax too small'
499  !do 100 i=1,nwz
500  !  aknew(2*(i-1)+1)=akm(i)
501  !00     bknew(2*(i-1)+1)=bkm(i)
502  !do 110 i=2,nuvz
503  !  aknew(2*(i-1))=akz(i)
504  !10     bknew(2*(i-1))=bkz(i)
505  ! End doubled vertical resolution
506
507
508  ! Determine the uppermost level for which the convection scheme shall be applied
509  ! by assuming that there is no convection above 50 hPa (for standard SLP)
510  !*****************************************************************************
511
512  do i=1,nuvz-2
513    pint=akz(i)+bkz(i)*101325.
514    if (pint.lt.5000.) goto 96
515  end do
51696   nconvlev=i
517  if (nconvlev.gt.nconvlevmax-1) then
518    nconvlev=nconvlevmax-1
519    write(*,*) 'Attention, convection only calculated up to ', &
520         akz(nconvlev)+bkz(nconvlev)*1013.25,' hPa'
521  endif
522
523  return
524
525999   write(*,*)
526  write(*,*) ' ###########################################'// &
527       '###### '
528  write(*,*) '       TRAJECTORY MODEL SUBROUTINE GRIDCHECK:'
529  write(*,*) ' CAN NOT OPEN INPUT DATA FILE '//wfname(ifn)
530  write(*,*) ' ###########################################'// &
531       '###### '
532  write(*,*)
533  write(*,'(a)') '!!! PLEASE INSERT A NEW CD-ROM AND   !!!'
534  write(*,'(a)') '!!! PRESS ANY KEY TO CONTINUE...     !!!'
535  write(*,'(a)') '!!! ...OR TERMINATE FLEXPART PRESSING!!!'
536  write(*,'(a)') '!!! THE "X" KEY...                   !!!'
537  write(*,*)
538  read(*,'(a)') opt
539  if(opt.eq.'X') then
540    stop
541  else
542    goto 5
543  endif
544
545end subroutine gridcheck
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