da_calculate_grady_polaramv.inc

1 subroutine da_calculate_grady_polaramv(iv, re, jo_grad_y)
2 
3    !-------------------------------------------------------------------------
4    ! Purpose: Calculates Gradient of Polar AMVs  Obs.          
5    !-------------------------------------------------------------------------
6 
7    implicit none
8 
9 
10    type (iv_type), intent(in)     :: iv          ! Innovation vector.
11    type (y_type),  intent(inout)  :: re          ! Residual vector.
12    type (y_type),  intent(inout)  :: jo_grad_y   ! Grad_y(Jo)
13 
14    integer :: n , k
15    
16    if (trace_use_dull) call da_trace_entry("da_calculate_grady_polaramv")
17 
18    do n=1, iv%info(polaramv)%nlocal
19       do k=1, iv%info(polaramv)%levels(n)
20          if (iv%polaramv(n)%u(k)%qc < obs_qc_pointer) then
21             re%polaramv(n)%u(k) = 0.0
22          end if
23          if (iv%polaramv(n)%v(k)%qc < obs_qc_pointer) then
24             re%polaramv(n)%v(k) = 0.0
25          end if
26 
27          jo_grad_y%polaramv(n)%u(k) = -re%polaramv(n)%u(k) / &
28              (iv%polaramv(n)%u(k)%error * iv%polaramv(n)%u(k)%error)
29          jo_grad_y%polaramv(n)%v(k) = -re%polaramv(n)%v(k) / &
30             (iv%polaramv(n)%v(k)%error * iv%polaramv(n)%v(k)%error)
31       end do
32    end do
33    
34    if (trace_use_dull) call da_trace_exit("da_calculate_grady_polaramv")
35 
36 end subroutine da_calculate_grady_polaramv
37 
38