da_jo_and_grady_polaramv.inc

1 subroutine da_jo_and_grady_polaramv( iv, re, jo, jo_grad_y)
2 
3    !----------------------------------------------------------------------
4    ! Purpose:  Calculates Cost function and Gradient for Polar AMVs Obs
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_polaramv")
17 
18    jo % polaramv_u = 0.0
19    jo % polaramv_v = 0.0
20 
21    do n=1, iv%info(polaramv)%nlocal
22       do k=1, iv%info(polaramv)%levels(n)
23          jo_grad_y%polaramv(n)%u(k) = -re%polaramv(n)%u(k) / &
24             ( iv%polaramv(n)%u(k)%error * iv%polaramv(n)%u(k)%error)
25          jo_grad_y%polaramv(n)%v(k) = -re%polaramv(n)%v(k) / &
26             ( iv%polaramv(n)%v(k)%error * iv%polaramv(n)%v(k)%error)
27       end do
28 
29       do k=1, iv%info(polaramv)%levels(n)
30          if (iv%info(polaramv)%proc_domain(k,n)) then
31             jo % polaramv_u = jo % polaramv_u - re%polaramv(n)%u(k) * jo_grad_y%polaramv(n)%u(k)
32             jo % polaramv_v = jo % polaramv_v - re%polaramv(n)%v(k) * jo_grad_y%polaramv(n)%v(k)
33          end if
34       end do
35    end do
36 
37    jo % polaramv_u = 0.5 * jo % polaramv_u
38    jo % polaramv_v = 0.5 * jo % polaramv_v
39 
40    if (trace_use_dull) call da_trace_exit("da_jo_and_grady_polaramv")
41      
42 end subroutine da_jo_and_grady_polaramv
43 
44