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 (ob_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    jo % qscat_u = 0.0
17    jo % qscat_v = 0.0
18 
19    if (iv%num_qscat > 0) then
20 
21       do n=1, iv%num_qscat
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%qscat(n)%loc%proc_domain) 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    end if
37      
38 end subroutine da_jo_and_grady_qscat
39 
40