wrf svn trunk commit r4103
[wrffire.git] / wrfv2_fire / var / da / da_transfer_model / da_transfer_kmatoxb.inc
blob8d071ed243e5cfc46a18c13d689b0762448d07ea
1 subroutine da_transfer_kmatoxb(xbx, grid)
3    !---------------------------------------------------------------------------
4    ! Purpose: Transfers fields from KMA to first guess (xb) structure.
5    !---------------------------------------------------------------------------
7    implicit none
8    
9    type (xbx_type), intent(inout)     :: xbx          ! Header & non-gridded vars.
11    type(domain), intent(inout)        :: grid
13    integer :: i, j, k
14    integer :: is, ie, js, je, ks, ke
15    real    :: tmpvar, earth_radius_sq,conv
16    real    :: tmpp,tmp_p,tmpps,tmp_ps
17    ! real    :: rgh_fac(grid%xp%ims:grid%xp%ime,grid%xp%jms:grid%xp%jme)
18    character(len=19) :: current_date
20    real :: TV(grid%xp%kms:grid%xp%kme)
21    real :: ALPHA(grid%xp%kms:grid%xp%kme)
22    real :: PHALF(grid%xp%kms:grid%xp%kme)
23    real :: PHALFL(grid%xp%kms:grid%xp%kme)                  
25    real :: pu, pd, coef, delp, hydro, rgasg, shgt
27    real, dimension(jds:jde) :: loc_latc_mean
29    real, allocatable :: arrayglobal(:,:) 
31    if (trace_use) call da_trace_entry("da_transfer_kmatoxb")
33    if (use_ssmiretrievalobs) then
34       call da_error(__FILE__,__LINE__, &
35          (/"Cannot use ssmi obs with kma global runs"/))
36    end if
38    conv = pi/180.0
39    earth_radius_sq = earth_radius*1000.0 * earth_radius*1000.0 * &
40                      conv*(360.0/(coarse_ix-1))*(180.0/(coarse_jy-2))*conv
41    COEF=0.6080                                               
42    RGASG = gas_constant/gravity                                            
44    !---------------------------------------------------------------------------
45    ! Set xb array range indices for processor subdomain.
46    !---------------------------------------------------------------------------
48    is = grid%xp % its
49    ie = grid%xp % ite
50    js = grid%xp % jts
51    je = grid%xp % jte
52    ks = grid%xp % kts
53    ke = grid%xp % kte
55    grid%xb % ds    = grid%dx
56    grid%xb % kma_a = grid%kma_a
57    grid%xb % kma_b = grid%kma_b
59    if (print_detail_xb) then
60        write(unit=stdout, fmt='(/a/)') &
61           'lvl         kma_a                 kma_b'
63        do k=ks,ke
64           write(unit=stdout, fmt='(i3,8e20.12)') k, grid%xb%kma_a(k), grid%xb%kma_b(k)
65       end do
66    end if
68    grid%xb % mix = grid%xp % ide - grid%xp % ids + 1
69    grid%xb % mjy = grid%xp % jde - grid%xp % jds + 1
70    grid%xb % mkz = grid%xp % kde - grid%xp % kds + 1
72    !---------------------------------------------------------------------------
73    ! KMA-specific fields:
74    !---------------------------------------------------------------------------
76    ! Fix ptop as 0.4 hPa.
77    ptop = 40.0     
79    grid%xb % ptop = ptop
80       
81    !---------------------------------------------------------------------------
82    ! Convert KMA fields to xb:
83    !---------------------------------------------------------------------------
85    grid%xb%lat(is:ie,js:je) =  grid%xlat(is:ie,js:je)
86    grid%xb%lon(is:ie,js:je) = grid%xlong(is:ie,js:je)
88 #ifdef DM_PARALLEL
89 #include "HALO_PSICHI_UV_ADJ.inc"
90 #endif
92    tmpvar  = 1.0/real(ide-ids+1)
94    !---------------------------------------------------------------
95    ! transfer u,v,t & q(specific humidity in g/g)
96    !---------------------------------------------------------------
98    do k=ks,ke
99       do j=js,je
100          do i=is,ie
101             grid%xb%u(i,j,k) = grid%u_2(i,j,k)
102             grid%xb%v(i,j,k) = grid%v_2(i,j,k)
103             grid%xb%t(i,j,k) = grid%t_2(i,j,k)
104             grid%xb%q(i,j,k) = grid%moist(i,j,k,P_QV)
105          end do
106       end do
107    end do
109    !---------------------------------------------------------------------------
110    ! Fix wind at Poles
111    !---------------------------------------------------------------------------
113     call da_get_vpoles(grid%xb%u,grid%xb%v,          &
114        ids,ide,jds,jde, &
115        grid%xp%ims,grid%xp%ime,grid%xp%jms,grid%xp%jme,grid%xp%kms,grid%xp%kme, &
116        grid%xp%its,grid%xp%ite,grid%xp%jts,grid%xp%jte,grid%xp%kts,grid%xp%kte )
118    if (print_detail_xb) then
119       write(unit=stdout,fmt='(A,2I5)') 'grid%xp%its, grid%xp%ite=', grid%xp%its, grid%xp%ite
120       write(unit=stdout,fmt='(A,2I5)') 'grid%xp%jts, grid%xp%jte=', grid%xp%jts, grid%xp%jte
121       write(unit=stdout,fmt='(A,2I5)') 'grid%xp%kts, grid%xp%kte=', grid%xp%kts, grid%xp%kte
122       write(unit=stdout,fmt='(A,2I5)') 'grid%xp%ims, grid%xp%ime=', grid%xp%ims, grid%xp%ime
123       write(unit=stdout,fmt='(A,2I5)') 'grid%xp%jms, grid%xp%jme=', grid%xp%jms, grid%xp%jme
124       write(unit=stdout,fmt='(A,2I5)') 'grid%xp%kms, grid%xp%kme=', grid%xp%kms, grid%xp%kme
125       write(unit=stdout,fmt='(A,2I5)') 'ids, ide=', ids, ide
126       write(unit=stdout,fmt='(A,2I5)') 'jds, jde=', jds, jde
127       write(unit=stdout,fmt='(A,2I5)') 'grid%xp%kds, grid%xp%kde=', grid%xp%kds, grid%xp%kde
129       write(unit=stdout,fmt='(A,I5)') 'size(grid%xb%u, dim=1)=', size(grid%xb%u, dim=1)
130       write(unit=stdout,fmt='(A,I5)') 'size(grid%xb%u, dim=2)=', size(grid%xb%u, dim=2)
131       write(unit=stdout,fmt='(A,I5)') 'size(grid%xb%u, dim=3)=', size(grid%xb%u, dim=3)
132       write(unit=stdout,fmt='(A,I5)') 'size(grid%xb%v, dim=1)=', size(grid%xb%v, dim=1)
133       write(unit=stdout,fmt='(A,I5)') 'size(grid%xb%v, dim=2)=', size(grid%xb%v, dim=2)
134       write(unit=stdout,fmt='(A,I5)') 'size(grid%xb%v, dim=3)=', size(grid%xb%v, dim=3)
136       write(unit=stdout,fmt='(A,I5)') 'size(grid%xa%u, dim=1)=', size(grid%xa%u, dim=1)
137       write(unit=stdout,fmt='(A,I5)') 'size(grid%xa%u, dim=2)=', size(grid%xa%u, dim=2)
138       write(unit=stdout,fmt='(A,I5)') 'size(grid%xa%u, dim=3)=', size(grid%xa%u, dim=3)
139       write(unit=stdout,fmt='(A,I5)') 'size(grid%xa%v, dim=1)=', size(grid%xa%v, dim=1)
140       write(unit=stdout,fmt='(A,I5)') 'size(grid%xa%v, dim=2)=', size(grid%xa%v, dim=2)
141       write(unit=stdout,fmt='(A,I5)') 'size(grid%xa%v, dim=3)=', size(grid%xa%v, dim=3)
143       write(unit=stdout,fmt='(A,I5)') 'size(grid%u_2, dim=1)=', size(grid%u_2, dim=1)
144       write(unit=stdout,fmt='(A,I5)') 'size(grid%u_2, dim=2)=', size(grid%u_2, dim=2)
145       write(unit=stdout,fmt='(A,I5)') 'size(grid%u_2, dim=3)=', size(grid%u_2, dim=3)
146       write(unit=stdout,fmt='(A,I5)') 'size(grid%v_2, dim=1)=', size(grid%v_2, dim=1)
147       write(unit=stdout,fmt='(A,I5)') 'size(grid%v_2, dim=2)=', size(grid%v_2, dim=2)
148       write(unit=stdout,fmt='(A,I5)') 'size(grid%v_2, dim=3)=', size(grid%v_2, dim=3)
149    end if
151    ALPHA(ke) = LOG(2.0)                                           
153    do j=js,je
154       do i=is,ie
155          grid%xb%cori(i,j) = grid%f(i,j)
156          grid%xb%psfc(i,j) = grid%psfc(i,j)
157          grid%xb%terr(i,j) = grid%ht(i,j)
159          ! Zhiquan Liu add some RTTOV variables
160          !--------------------------------------
161          grid%xb%t2(i,j) = grid%t2(i,j)
162          grid%xb%q2(i,j) = grid%q2(i,j)
163          grid%xb%u10(i,j) = grid%u10(i,j)
164          grid%xb%v10(i,j) = grid%v10(i,j)
165          grid%xb%tsk(i,j) = grid%tsk(i,j)
166          ! currently KMA guess have no SST, replaced by TSK
167          ! grid%xb%tgrn(i,j) = grid%sst(i,j)
168          grid%xb%tgrn(i,j) = grid%tsk(i,j)
169          grid%xb%landmask(i,j) = grid%landmask(i,j)
170          grid%xb%xland(i,j) = grid%xland(i,j)
172          grid%xb%smois(i,j) = grid%smois(i,j,1)
173          grid%xb%tslb(i,j) = grid%tslb(i,j,1)
174          grid%xb%xice(i,j) = grid%xice(i,j)
175          grid%xb%ivgtyp(i,j) = grid%ivgtyp(i,j)
176          grid%xb%isltyp(i,j) = grid%isltyp(i,j)
177          grid%xb%vegfra(i,j) = grid%vegfra(i,j)
178          ! convert snow water equivalent kg/m2 to snow depth(mm)
179          grid%xb%snowh(i,j) = grid%snow(i,j)*10.0 
181          !---------------------------------------------------------------------
182          !  Syed RH Rizvi
183          ! 
184          ! The following code is to be activated after
185          ! getting sst, land use, land mask and snow information for KMA grid
186          ! This infor needs to be packed in "KMA2NETCDF" convertor
187          !                              
188          !---------------------------------------------------------------------
190          ! grid%xb%tgrn(i,j) = grid%sst(i,j)
191          ! if (grid%xb%tgrn(i,j) < 100.0) grid%xb%tgrn(i,j) = tmn(i,j)
192          ! grid%xb%lanu(i,j)     = grid%lu_index(i,j)
193          ! grid%xb%landmask(i,j) = grid%landmask(i,j)
194          ! grid%xb%xland(i,j) = grid%xland(i,j)
195          ! grid%xb%snow(i,j)     = grid%snowc(i,j)
197          ! Since data is on full levels get full level pr & ht.
198          ! Note p = A + B * Psfc formula needs Psfc to be in hPa 
200          do K = ks,ke-1    
201             PU  = grid%xb%KMA_A(K+1) + grid%xb%KMA_B(K+1)*grid%xb%psfc(i,j)/100.0
202             PD  = grid%xb%KMA_A(K ) + grid%xb%KMA_B(K )*grid%xb%psfc(i,j)/100.0
203             if (PU == PD)then
204                message(1)='PU, PD equal and so denominator will be zero'
205                write(unit=message(2),fmt='(A,3I5)') ' i, j, k = ',i,j,k
206                write(unit=message(3),fmt='(A,2F10.2)') &
207                   ' KMA_A ',grid%KMA_A(k),grid%KMA_A(K+1)
208                write(unit=message(4),fmt='(A,2F10.2)') &
209                   ' KMA_B ',grid%KMA_B(k),grid%KMA_B(K+1)
210                write(unit=message(5),fmt='(A,2F10.2)') &
211                   ' psfc(Pa) = ',grid%xb%psfc(i,j)
212                call da_error(__FILE__,__LINE__,message(1:5))
213             end if
214             grid%xb%p(i,j,k)= 100.0 * exp ((PD*LOG(PD)-PU*LOG(PU))/(PD-PU) -1.0)
215          end do 
217          grid%xb%p(i,j,ke) = 100.0*(grid%xb%KMA_A(ke)+grid%xb%KMA_B(ke)*grid%xb%psfc(i,j)/100.0)/2.0
219          do k=ks,ke
220             if (grid%xb%t(i,j,k) <= 0.0) then
221                write(unit=message(1),fmt='(A,3I5,F10.2)') &
222                   'Problem in  temp = ',i,j,k,grid%xb%t(i,j,k)   
223                call da_error(__FILE__,__LINE__,message(1:1))
224             end if
226             grid%xb%rho(i,j,k)=grid%xb%p(i,j,k)/(gas_constant*  &
227                (1.0+COEF*grid%xb%q(I,J,K))*grid%xb%t(I,J,K))   
228          end do
230          ! compute full level height
232          do K = ks,ke    
233             PHALF(K) = grid%xb%KMA_A(K) + grid%xb%KMA_B(K)*grid%xb%psfc(I,J)/100.0                             
234             TV   (K) = (1.0+COEF*grid%xb%q(I,J,K))*grid%xb%t(I,J,K)*rgasg    
235          end do                                                           
237          do K = ks,ke-1                                              
238             DELP     = PHALF(K) - PHALF(K+1)                              
239             PHALFL(K)= LOG(PHALF(K)/PHALF(K+1))                           
240             ALPHA(K) = 1.0-PHALF(K+1)*PHALFL(K)/DELP                     
241          end do  
243          SHGT = grid%xb%terr(i,j)
244          do K = ks, ke                                               
245             grid%xb%h(I,J,K) = SHGT + ALPHA(K)*TV(K)                           
246          end do 
248          HYDRO = 0.0                                                    
249          do K = ks+1, ke
250             HYDRO = HYDRO + TV(K-1)*PHALFL(K-1)                           
251             grid%xb%h(I,J,K) = grid%xb%h(I,J,K) + HYDRO                             
252          end do                                                        
253       end do
254    end do
256    !---------------------------------------------------------------------------
257    ! Sigma values are needed for interpolating 
258    ! background error statistics in vertical
259    ! Fix sigmah values based on global average surface pressure 
260    !                    and level wise pressure
261    !---------------------------------------------------------------------------
263    tmp_ps = sum(grid%xb%psfc(is:ie,js:je)) /real((ide-ids+1)*(jde-jds+1))
265    tmpps = wrf_dm_sum_real(tmp_ps)
267    do k=ks,ke
268       tmp_p = sum(grid%xb%p(is:ie,js:je,k)) /real((ide-ids+1)*(jde-jds+1))
269       tmpp = wrf_dm_sum_real(tmp_p)
271       ! 0.01 is added to see that sigmah should not become negative
272       grid%xb%sigmah(ke+ks-k) = (tmpp - ptop+0.01) / (tmpps- ptop+0.01) 
273       if (grid%xb%sigmah(ke+ks-k) < 0.0) then
274          write(unit=message(1),fmt='(A,F10.2)') &
275             ' average surface pressure = ',tmpps  
276          write(unit=message(2),fmt='(A,I5,A,F10.2)') &
277             ' average pressure at this level= ',k,' = ',tmpp  
278          write(unit=message(3),fmt='(A,I5,A,F10.2)') &
279             ' negative sigmah(',ke+ks-k,') = ',grid%xb%sigmah(ke+ks-k) 
280          call da_error(__FILE__,__LINE__,message(1:3))
281       end if
282    end do
284    ! Fix ztop
285    
286    grid%xb%ztop = grid%xb%h(is,js,ke)
288    if (print_detail_xb) then
289       write(unit=stdout, fmt='(/5a/)') &
290          'lvl         h                 p                t'
292       do k=ks,ke
293          write(unit=stdout, fmt='(i3,8e20.12)') k, &
294             grid%xb%h(is,js,k), grid%xb%p(is,js,k), grid%xb%t(is,js,k)
295       end do
297       write (unit=stdout,fmt=*) ' '
298       write (unit=stdout,fmt=*) 'grid%xb%u(is,je,ke)=', grid%xb%u(is,je,ke)
299       write (unit=stdout,fmt=*) 'grid%xb%v(ie,js,ke)=', grid%xb%v(ie,js,ke)
300       write (unit=stdout,fmt=*) 'grid%xb%w(is,js,ke)=', grid%xb%w(is,js,ke)
301       write (unit=stdout,fmt=*) 'grid%xb%t(is,js,ke)=', grid%xb%t(is,js,ke)
302       write (unit=stdout,fmt=*) 'grid%xb%p(is,js,ke)=', grid%xb%p(is,js,ke)
303       write (unit=stdout,fmt=*) 'grid%xb%q(is,js,ke)=', grid%xb%q(is,js,ke)
304       write (unit=stdout,fmt=*) 'grid%xb%hf(is,js,ke)=', grid%xb%hf(is,js,ke)
305       write (unit=stdout,fmt=*) 'grid%xb%map_factor(is,js)=', grid%xb%map_factor(is,js)
306       write (unit=stdout,fmt=*) 'grid%xb%cori(is,js)=', grid%xb%cori(is,js)
307       write (unit=stdout,fmt=*) 'grid%xb%tgrn(is,js)=', grid%xb%tgrn(is,js)
308       write (unit=stdout,fmt=*) 'grid%xb%lat(is,js)=', grid%xb%lat(is,js)
309       write (unit=stdout,fmt=*) 'grid%xb%lon(is,js)=', grid%xb%lon(is,js)
310       write (unit=stdout,fmt=*) 'grid%xb%terr(is,js)=', grid%xb%terr(is,js)
311       write (unit=stdout,fmt=*) 'grid%xb%snow(is,js)=', grid%xb%snow(is,js)
312       write (unit=stdout,fmt=*) 'grid%xb%lanu(is,js)=', grid%xb%lanu(is,js)
313       write (unit=stdout,fmt=*) 'grid%xb%landmask(is,js)=', grid%xb%landmask(is,js)
314       write (unit=stdout,fmt=*) ' '
315    end if
317    write(current_date(1:19), fmt='(i4.4, 5(a1, i2.2))') &
318       grid%start_year, '-', &
319       grid%start_month, '-', &
320       grid%start_day,   '_', &
321       grid%start_hour,  ':', &
322       grid%start_minute,':', &
323       grid%start_second
325    write(unit=stdout,fmt='(2A)') 'Current date is ',current_date 
327    !---------------------------------------------------------------------------
328    ! Syed RH Rizvi
329    ! 
330    ! Following code for calculating roughness length needs to be activated  
331    ! after getting land use data for KMA grid 
332    !---------------------------------------------------------------------------
334    !
335    ! Set proper value for "mminlu" if using KMA info
337    !xbx % mminlu = 'USGS'
338    !call da_roughness_from_lanu(19, xbx % mminlu, current_date, grid%xp, &
339    !   grid%xb % lanu(grid%xp%ims,grid%xp%jms), grid%xb % rough(grid%xp%ims,grid%xp%jms))
341    do j=js,je
342       do i=is,ie
343          if (grid%xb%ztop < grid%xb%hf(i,j,ke+1)) grid%xb%ztop = grid%xb%hf(i,j,ke+1)
344          ! Calculate grid_box area and vertical inner product for use in 
345          ! vertical transform:
346          grid%xb % grid_box_area(i,j) = earth_radius_sq * cos(grid%xlat(i,j)*conv)
348          if (vertical_ip == vertical_ip_sqrt_delta_p) then
349             ! Vertical inner product is sqrt(Delta p):
350             do k=1,grid%xb%mkz
351                grid%xb % vertical_inner_product(i,j,k) = &
352                   sqrt(grid%xb%p(i,j,k)-grid%xb%p(i,j,k+1))
353             end do
354          else if (vertical_ip == vertical_ip_delta_p) then
355             ! Vertical inner product is Delta p:
356             do k=1,grid%xb%mkz
357             grid%xb % vertical_inner_product(i,j,k) = grid%xb%p(i,j,k)-grid%xb%p(i,j,k+1)
358             end do
359          end if
361          !------------------------------------------------------------------------------
362          !  Syed RH Rizvi
363          ! 
364          ! Following code for calculating roughness length needs to be activated  
365          ! to calculate surface variables (10-m wind, and 2-m T, Q) , 
366          ! After testing KMA-WRFVAR for SFC_ASSIM_OPTIONS = 2
367          !
368          !------------------------------------------------------------------------------
370          ! call da_sfc_wtq(grid%xb%psfc(i,j), grid%xb%tgrn(i,j), &
371          !    grid%xb%p(i,j,ks), grid%xb%t(i,j,ks), grid%xb%q(i,j,ks), &
372          !    grid%xb%u(i,j,ks), grid%xb%v(i,j,ks), &
373          !    grid%xb%p(i,j,ks+1), grid%xb%t(i,j,ks+1), grid%xb%q(i,j,ks+1), &
374          !    grid%xb%h(i,j,ks), grid%xb%rough(i,j),grid%xb%landmask(i,j), &
375          !    grid%xb%u10(i,j), grid%xb%v10(i,j), grid%xb%t2(i,j), grid%xb%q2(i,j), &
376          !    grid%xb%regime(i,j))
378          ! write (unit=stdout,fmt='(7I5)') &
379          !    i,j,grid%xb%psfc(i,j),grid%xb%t2(i,j),grid%xb%q2(i,j), &
380          !    grid%xb%u10(i,j),grid%xb%v10(i,j)
381          ! ------------------------------------------------------------------------------
383       end do
384    end do
386    !---------------------------------------------------------------------------
387    ! Calculate saturation vapour pressure and relative humidity:
388    !---------------------------------------------------------------------------
390    do j=js,je
391       do k=ks,ke
392          do i=is,ie
393             call da_tpq_to_rh(grid%xb % t(i,j,k), grid%xb % p(i,j,k), &
394                grid%xb % q(i,j,k), &
395                grid%xb %es(i,j,k), grid%xb %qs(i,j,k), grid%xb %rh(i,j,k))
396          end do
397       end do
398    end do
400    !---------------------------------------------------------------------------
401    ! Calculate dew point temperature:
402    !---------------------------------------------------------------------------
404    call da_trh_to_td (grid)
406    if (print_detail_xb) then
407       i=is; j=js; k=ks
409       write (unit=stdout,fmt='(A,3I5)') 'i,j,k=', i,j,k
410       write (unit=stdout,fmt='(A,F10.2)') 'grid%xb % td(i,j,k)=', grid%xb % td(i,j,k)
411       write (unit=stdout,fmt='(A,F10.2)') 'grid%xb % es(i,j,k)=', grid%xb % es(i,j,k)
412       write (unit=stdout,fmt='(A,F10.2)') 'grid%xb % rh(i,j,k)=', grid%xb % rh(i,j,k)
413       write (unit=stdout,fmt='(A,F10.2)') 'grid%xb % qs(i,j,k)=', grid%xb % qs(i,j,k)
414       write (unit=stdout,fmt='(A)') ' '
415    end if
417    !---------------------------------------------------------------------------
418    ! Sea level pressure and total precipitable water
419    !---------------------------------------------------------------------------
421    !---------------------------------------------------------------------------
422    ! Following code for calculating roughness length needs to be activated  
423    ! for calculating roughness length if sea level pressure is desired
424    !---------------------------------------------------------------------------
426    ! call da_wrf_tpq_2_slp (grid)
428    call da_integrat_dz(grid)
429    !---------------------------------------------------------------------------
430    ! Following code for calculating roughness length needs to be activated  
431    ! for surface wind speed for SFC_ASSIM_OPTIONS = 2 
432    ! 
433    ! It is not working because KMA terrain height output from wave to grid 
434    ! transform is negative at many grid points
435    !---------------------------------------------------------------------------
437    ! tmpvar = log(10.0/0.0001)
438    ! do j=js,je
439    !    do i=is,ie
440    !       if (grid%xb%hf(i,j,ks) <= 0) then
441    !          write(unit=message(1), fmt=*) ' zero hf at i/j ',i,j,' ks= ',ks
442    !          call da_error(__FILE__,__LINE__,message(1:1))
443    !       end if
444    !       rgh_fac(i,j) = 1.0/log(grid%xb%hf(i,j,ks)/0.0001)
446    !       grid%xb%speed(i,j) = sqrt(grid%xb%u(i,j,ks)*grid%xb%u(i,j,ks) &
447    !          + grid%xb%v(i,j,ks)*grid%xb%v(i,j,ks) + 1.0e-6) &
448    !          *tmpvar*rgh_fac(i,j)
449    !    end do
450    ! end do
452    !---------------------------------------------------------------------------
453    ! Following code for calculating roughness length needs to be activated  
454    ! if SSMI brightness temperature are used
455    !---------------------------------------------------------------------------
457    ! call da_transform_xtotb(xa)
459    !---------------------------------------------------------------------------
460    ! Calculate means for later use in setting up background errors.
461    !---------------------------------------------------------------------------
463    allocate (xbx % latc_mean(jds:jde))
465    tmpvar = 1.0/real(ide-ids+1)
466    loc_latc_mean(:) = 0.0
468    ! Bitwise-exact reduction preserves operation order of serial code for
469    ! testing, at the cost of much-increased run-time.  Turn it off when not     
470    ! testing.  This will always be .false. for a serial or 1-process MPI run.  
471    if (test_dm_exact) then
472       allocate(arrayglobal(ids:ide, jds:jde))
473       call da_patch_to_global(grid, grid%xb%lat, arrayglobal)
474       do j=jds,jde
475          loc_latc_mean(j) = tmpvar*sum(arrayglobal(ids:ide, j))
476       end do
477       deallocate(arrayglobal)
478       ! Broadcast result from monitor to other tasks.
479       call wrf_dm_bcast_real(loc_latc_mean, (jde-jds+1))
480       xbx % latc_mean = loc_latc_mean
481    else
482       do j=js,je
483          loc_latc_mean(j) = tmpvar*sum(grid%xb % lat(is:ie, j))
484       end do
485       call wrf_dm_sum_reals (loc_latc_mean, xbx % latc_mean)
486    end if
488    ! WHY?
489    !  do j=js,je
490    !    do i=is,ie
491    !       write(unit=stdout,fmt='(2i4,3f12.2,e12.4,2f12.2)') &
492    !          j,i,grid%xb%psfc(i,j),grid%xb%tsk(i,j),grid%xb%t2(i,j), &
493    !          grid%xb%q2(i,j),grid%xb%u10(i,j),grid%xb%v10(i,j)
494    !    end do
495    ! end do
497    if (trace_use) call da_trace_exit("da_transfer_kmatoxb")
499 end subroutine da_transfer_kmatoxb