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subroutine da_calculate_grady_satem(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, k
if (trace_use_dull) call da_trace_entry
("da_calculate_grady_satem")
do n=1, iv%info(satem)%nlocal
do k=1, iv%info(satem)%levels(n)
if (iv%satem(n)%thickness(k)%qc < obs_qc_pointer) then
re%satem(n)%thickness(k) = 0.0
end if
jo_grad_y%satem(n)%thickness(k) = -re%satem(n)%thickness(k) / &
(iv%satem(n)%thickness(k)%error * iv%satem(n)%thickness(k)%error)
end do
end do
if (trace_use_dull) call da_trace_exit("da_calculate_grady_satem")
end subroutine da_calculate_grady_satem