da_jo_and_grady_ssmt2.inc

1 subroutine da_jo_and_grady_ssmt2(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, k
15 
16    if (trace_use_dull) call da_trace_entry("da_jo_and_grady_ssmt2")
17 
18    jo % ssmt2_rh = 0.0
19    
20    do n=1, iv%info(ssmt2)%nlocal
21       do k=1, iv%info(ssmt2)%levels(n)
22          jo_grad_y%ssmt2(n)%rh(k) = -re%ssmt2(n)%rh(k) / &
23             (iv%ssmt2(n)%rh(k)%error * iv%ssmt2(n)%rh(k)%error)
24 
25          jo % ssmt2_rh = jo % ssmt2_rh - re%ssmt2(n)%rh(k) * jo_grad_y%ssmt2(n)%rh(k)
26       end do
27    end do
28 
29    jo % ssmt2_rh = 0.5 * jo % ssmt2_rh
30 
31    if (trace_use_dull) call da_trace_exit("da_jo_and_grady_ssmt2")
32 
33 end subroutine da_jo_and_grady_ssmt2
34 
35