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subroutine da_calculate_grady_gpspw(iv, re, jo_grad_y) 1,2
!-----------------------------------------------------------------------
! Purpose: Applies obs inverse on re-vector
!-----------------------------------------------------------------------
implicit none
type (iv_type), intent(in) :: iv ! Innovation vector.
type (y_type), intent(inout) :: re ! Residual vector.
type (y_type), intent(inout) :: jo_grad_y ! Grad_y(Jo)
integer :: n
if (trace_use_dull) call da_trace_entry
("da_calculate_grady_gpspw")
do n=1, iv%info(gpspw)%nlocal
if (iv%gpspw(n)%tpw%qc < obs_qc_pointer) then
re%gpspw(n)%tpw = 0.0
end if
jo_grad_y%gpspw(n)%tpw = -re%gpspw(n)%tpw / (iv%gpspw(n)%tpw%error * iv%gpspw(n)%tpw%error)
end do
if (trace_use_dull) call da_trace_exit("da_calculate_grady_gpspw")
end subroutine da_calculate_grady_gpspw