module intsstmod !$$$ module documentation block ! . . . . ! module: intsstmod module for intsst and its tangent linear intsst_tl ! prgmmr: ! ! abstract: module for intsst and its tangent linear intsst_tl ! ! program history log: ! 2005-05-16 Yanqiu zhu - wrap intsst and its tangent linear intsst_tl into one module ! 2005-11-16 Derber - remove interfaces ! 2008-11-26 Todling - remove intsst_tl ! 2009-08-13 lueken - update documentation ! ! subroutines included: ! sub intsst ! ! variable definitions: ! ! attributes: ! language: f90 ! machine: ! !$$$ end documentation block implicit none PRIVATE PUBLIC intsst contains subroutine intsst(ssthead,rsst,ssst) !$$$ subprogram documentation block ! . . . . ! subprogram: intsst apply nonlin qc obs operator for conv. sst ! prgmmr: derber org: np23 date: 2004-07-20 ! ! abstract: apply observation operator and adjoint for conventional sst ! observations with nonlinear qc operator ! ! program history log: ! 2004-07-20 derber ! 2004-08-02 treadon - add only to module use, add intent in/out ! 2004-10-09 parrish - add nonlinear qc option ! 2005-03-01 parrish - nonlinear qc change to account for inflated obs error ! 2005-04-11 treadon - merge intsst and intsst_qc into single routine ! 2005-08-02 derber - modify for variational qc parameters for each ob ! 2005-09-28 derber - consolidate location and weight arrays ! 2006-07-28 derber - modify to use new inner loop obs data structure ! - unify NL qc ! 2007-03-19 tremolet - binning of observations ! 2007-06-05 tremolet - use observation diagnostics structure ! 2007-07-09 tremolet - observation sensitivity ! 2008-01-04 tremolet - Don't apply H^T if l_do_adjoint is false ! ! input argument list: ! ssthead ! ssst - increment in grid space ! rsst ! ! output argument list: ! rsst - results from observation operator (0 for no data) ! ! attributes: ! language: f90 ! machine: ibm RS/6000 SP ! !$$$ use kinds, only: r_kind,i_kind use constants, only: half,one,tiny_r_kind,cg_term use obsmod, only: sst_ob_type, lsaveobsens, l_do_adjoint use qcmod, only: nlnqc_iter,varqc_iter use gridmod, only: latlon11 use jfunc, only: jiter implicit none ! Declare passed variables type(sst_ob_type),pointer ,intent(in ) :: ssthead real(r_kind),dimension(latlon11),intent(in ) :: ssst real(r_kind),dimension(latlon11),intent(inout) :: rsst ! Declare local variables integer(i_kind) j1,j2,j3,j4 ! real(r_kind) penalty real(r_kind) w1,w2,w3,w4 real(r_kind) val real(r_kind) cg_sst,p0,grad,wnotgross,wgross,pg_sst type(sst_ob_type), pointer :: sstptr sstptr => ssthead do while (associated(sstptr)) j1=sstptr%ij(1) j2=sstptr%ij(2) j3=sstptr%ij(3) j4=sstptr%ij(4) w1=sstptr%wij(1) w2=sstptr%wij(2) w3=sstptr%wij(3) w4=sstptr%wij(4) ! Forward model val=w1*ssst(j1)+w2*ssst(j2)& +w3*ssst(j3)+w4*ssst(j4) if (lsaveobsens) then sstptr%diags%obssen(jiter) = val*sstptr%raterr2*sstptr%err2 else if (sstptr%luse) sstptr%diags%tldepart(jiter)=val endif if (l_do_adjoint) then if (lsaveobsens) then grad = sstptr%diags%obssen(jiter) else val=val-sstptr%res ! gradient of nonlinear operator if (nlnqc_iter .and. sstptr%pg > tiny_r_kind .and. & sstptr%b > tiny_r_kind) then pg_sst=sstptr%pg*varqc_iter cg_sst=cg_term/sstptr%b wnotgross= one-pg_sst wgross = pg_sst*cg_sst/wnotgross p0 = wgross/(wgross+exp(-half*sstptr%err2*val**2)) val = val*(one-p0) endif grad = val*sstptr%raterr2*sstptr%err2 endif ! Adjoint rsst(j1)=rsst(j1)+w1*grad rsst(j2)=rsst(j2)+w2*grad rsst(j3)=rsst(j3)+w3*grad rsst(j4)=rsst(j4)+w4*grad endif sstptr => sstptr%llpoint end do return end subroutine intsst end module intsstmod