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subroutine da_calculate_grady_qscat(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_qscat")
do n=1, iv%info(qscat)%nlocal
if (iv%qscat(n)%u%qc < obs_qc_pointer) re%qscat(n)%u = 0.0
if (iv%qscat(n)%v%qc < obs_qc_pointer) re%qscat(n)%v = 0.0
jo_grad_y%qscat(n)%u = -re%qscat(n)%u / (iv%qscat(n)%u%error * iv%qscat(n)%u%error)
jo_grad_y%qscat(n)%v = -re%qscat(n)%v / (iv%qscat(n)%v%error * iv%qscat(n)%v%error)
end do
if (trace_use_dull) call da_trace_exit("da_calculate_grady_qscat")
end subroutine da_calculate_grady_qscat