da_jo_and_grady_qscat.inc

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