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(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, k
15 
16    jo % polaramv_u = 0.0
17    jo % polaramv_v = 0.0
18 
19    if (iv%num_polaramv > 0) then
20       do n=1, iv%num_polaramv
21          do k=1, iv%polaramv(n)%info%levels
22 
23             jo_grad_y%polaramv(n)%u(k) = -re%polaramv(n)%u(k) / &
24                                      ( iv%polaramv(n)%u(k)%error * &
25                                         iv%polaramv(n)%u(k)%error)
26             jo_grad_y%polaramv(n)%v(k) = -re%polaramv(n)%v(k) / &
27                                      ( iv%polaramv(n)%v(k)%error * &
28                                         iv%polaramv(n)%v(k)%error)
29          end do
30 
31          if (iv%polaramv(n)%loc%proc_domain) then
32             do k=1, iv%polaramv(n)%info%levels
33                jo % polaramv_u = jo % polaramv_u - &
34                         re%polaramv(n)%u(k) * jo_grad_y%polaramv(n)%u(k)
35                jo % polaramv_v = jo % polaramv_v - &
36                          re%polaramv(n)%v(k) * jo_grad_y%polaramv(n)%v(k)
37             end do
38          end if
39       end do
40 
41       jo % polaramv_u = 0.5 * jo % polaramv_u
42       jo % polaramv_v = 0.5 * jo % polaramv_v
43 
44    end if
45      
46 end subroutine da_jo_and_grady_polaramv
47 
48