da_jo_and_grady_gpsref.inc

1 subroutine da_jo_and_grady_gpsref( iv, re, jo, jo_grad_y)
2 
3    !-----------------------------------------------------------------------
4    ! Purpose: TBD
5    !-----------------------------------------------------------------------
6 
7    !----------------------------------------------------------------------
8    ! Called by da_minimisation/da_jo_and_grady.inc
9    !----------------------------------------------------------------------
10 
11    implicit none
12 
13    type(iv_type), intent(in)    :: iv          ! Innovation vector.
14    type(y_type),  intent(in)    :: re          ! Residual vector.
15    type(y_type),  intent(inout) :: jo_grad_y   ! Grad_y(Jo)
16    type(jo_type), intent(inout) :: jo          ! Obs cost function.
17 
18    integer :: n, k
19 
20    if (trace_use_dull) call da_trace_entry("da_jo_and_grady_gpsref")
21 
22    jo % gpsref_ref = 0.0
23 
24    do n=1, iv%info(gpsref)%nlocal
25       do k=1, iv%info(gpsref)%levels(n)
26          jo_grad_y%gpsref(n)%ref(k) = -re%gpsref(n)%ref(k) / &
27             ( iv%gpsref(n)%ref(k)%error * iv%gpsref(n)%ref(k)%error)
28       end do
29 
30       if (iv%info(gpsref)%proc_domain(1,n)) then
31          do k=1, iv%info(gpsref)%levels(n)
32             jo % gpsref_ref = jo % gpsref_ref - &
33                 re%gpsref(n)%ref(k) * jo_grad_y%gpsref(n)%ref(k)
34          end do
35       end if
36 
37       jo % gpsref_ref = 0.5 * jo % gpsref_ref    
38    end do
39 
40    if (trace_use_dull) call da_trace_exit("da_jo_and_grady_gpsref")
41 
42 end subroutine da_jo_and_grady_gpsref
43 
44