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subroutine da_calculate_grady_ssmt2(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_ssmt2")
do n=1, iv%info(ssmt2)%nlocal
do k=1, iv%info(ssmt2)%levels(n)
if (iv%ssmt2(n)%rh(k)%qc < obs_qc_pointer) re%ssmt2(n)%rh(k) = 0.0
jo_grad_y%ssmt2(n)%rh(k) = -re%ssmt2(n)%rh(k) / &
(iv%ssmt2(n)%rh(k)%error * iv%ssmt2(n)%rh(k)%error)
end do
end do
if (trace_use_dull) call da_trace_exit("da_calculate_grady_ssmt2")
end subroutine da_calculate_grady_ssmt2