da_transform_xtoy_airsr_adj.inc

1 subroutine da_transform_xtoy_airsr_adj(iv, xp, jo_grad_y, jo_grad_x)
2 
3    !----------------------------------------------------------------------
4    ! Purpose: Does adjoint computation at AIRS retrieval locations
5    !----------------------------------------------------------------------
6 
7    implicit none
8 
9    type (ob_type), intent(in)    :: iv          ! obs. inc vector (o-b).
10    type (xpose_type), intent(in) :: xp          ! Domain decomposition vars.
11    type (y_type) , intent(in)    :: jo_grad_y   ! grad_y(jo)
12    type (x_type) , intent(inout) :: jo_grad_x   ! grad_x(jo)
13 
14    integer                       :: n        ! Loop counter.
15    integer                       :: i, j, k  ! Index dimension.
16    real                          :: dx, dxm  ! 
17    real                          :: dy, dym  !
18 
19    if (iv%num_airsr > 0) then
20       do n=iv%ob_numb(iv%current_ob_time-1)%airsr + 1, iv%ob_numb(iv%current_ob_time)%airsr
21 
22          ! [1.1] Get horizontal interpolation weights:
23 
24          i = iv%airsr(n)%loc%i
25          j = iv%airsr(n)%loc%j
26          dx = iv%airsr(n)%loc%dx
27          dy = iv%airsr(n)%loc%dy
28          dxm = iv%airsr(n)%loc%dxm
29          dym = iv%airsr(n)%loc%dym
30 
31          k = iv % airsr(n) % info % levels
32 
33          if (k < 1) cycle
34 
35          ! [1.2] Interpolate horizontally:
36          call da_interp_lin_3d_adj(jo_grad_x % t, xp, i, j, dx, dy, dxm, dym, &
37                                 jo_grad_y%airsr(n)%t, k, iv%airsr(n)%zk, k)
38          call da_interp_lin_3d_adj(jo_grad_x % q, xp, i, j, dx, dy, dxm, dym, &
39                                 jo_grad_y%airsr(n)%q, k, iv%airsr(n)%zk, k)
40       end do
41    end if
42 
43 end subroutine da_transform_xtoy_airsr_adj
44 
45