diff --git a/config/acme/machines/Depends.titan.pgi b/config/acme/machines/Depends.titan.pgi
index 35dbb90f58d..4091a527d85 100644
--- a/config/acme/machines/Depends.titan.pgi
+++ b/config/acme/machines/Depends.titan.pgi
@@ -1,11 +1,29 @@
+# lowered optimization to speed-up compilation time
 dyn_comp.o: dyn_comp.F90
 	$(FC) -c $(INCLDIR) $(INCS) $(FFLAGS_NOOPT) $(FREEFLAGS) $<
 
-#uwshcu.o: uwshcu.F90
-#	$(FC) -c $(INCLDIR) $(INCS) $(FFLAGS_NOOPT) $(FREEFLAGS) $<
+# following need -target-cpu=istanbul for reproducibility
+interpolate_data.o: interpolate_data.F90
+	$(FC) -c $(INCLDIR) $(INCS) $(FFLAGS) $(FREEFLAGS) -target-cpu=istanbul $<
 
-#mo_drydep.o: mo_drydep.F90
-#	$(FC) -c $(INCLDIR) $(INCS) $(FFLAGS_NOOPT) $(FREEFLAGS) $<
+tracer_data.o: tracer_data.F90
+	$(FC) -c $(INCLDIR) $(INCS) $(FFLAGS) $(FREEFLAGS) -target-cpu=istanbul $<
+
+aero_model.o: aero_model.F90
+	$(FC) -c $(INCLDIR) $(INCS) $(FFLAGS) $(FREEFLAGS) -target-cpu=istanbul $<
+
+modal_aero_deposition.o: modal_aero_deposition.F90
+	$(FC) -c $(INCLDIR) $(INCS) $(FFLAGS) $(FREEFLAGS) -target-cpu=istanbul $<
+
+dust_sediment_mod.o: dust_sediment_mod.F90
+	$(FC) -c $(INCLDIR) $(INCS) $(FFLAGS) $(FREEFLAGS) -target-cpu=istanbul $<
+
+mo_gas_phase_chemdr.o: mo_gas_phase_chemdr.F90
+	$(FC) -c $(INCLDIR) $(INCS) $(FFLAGS) $(FREEFLAGS) -target-cpu=istanbul $<
+
+modal_aer_opt.o: modal_aer_opt.F90
+	$(FC) -c $(INCLDIR) $(INCS) $(FFLAGS) $(FREEFLAGS) -target-cpu=istanbul $<
+
+zm_conv.o: zm_conv.F90
+	$(FC) -c $(INCLDIR) $(INCS) $(FFLAGS) $(FREEFLAGS) -target-cpu=istanbul $<
 
-#micro_mg1_5.o: micro_mg1_5.F90
-#	$(FC) -c $(INCLDIR) $(INCS) $(FFLAGS_NOOPT) $(FREEFLAGS) $<
diff --git a/config/acme/machines/Depends.titan.pgiacc b/config/acme/machines/Depends.titan.pgiacc
index fa35f103679..3263d83704c 100644
--- a/config/acme/machines/Depends.titan.pgiacc
+++ b/config/acme/machines/Depends.titan.pgiacc
@@ -7,46 +7,46 @@ microp_aero.o: microp_aero.F90
 
 
 bndry_mod.o: bndry_mod.F90
-	$(FC) -c $(INCLDIR) $(INCS) $(FFLAGS) -DUSE_OPENACC=1 -acc -ta=tesla,pin,cc35,cuda7.5,ptxinfo -Minfo=accel $(FREEFLAGS) $<
+	$(FC) -c $(INCLDIR) $(INCS) $(FFLAGS) -DUSE_OPENACC=1 -acc -ta=tesla,pinned,cc35,cuda7.5,ptxinfo -Minfo=accel $(FREEFLAGS) $<
 
 derivative_mod.o: derivative_mod.F90
-	$(FC) -c $(INCLDIR) $(INCS) $(FFLAGS) -DUSE_OPENACC=1 -acc -ta=tesla,pin,cc35,cuda7.5,ptxinfo -Minfo=accel $(FREEFLAGS) $<
+	$(FC) -c $(INCLDIR) $(INCS) $(FFLAGS) -DUSE_OPENACC=1 -acc -ta=tesla,pinned,cc35,cuda7.5,ptxinfo -Minfo=accel $(FREEFLAGS) $<
 
 edge_mod.o: edge_mod.F90
-	$(FC) -c $(INCLDIR) $(INCS) $(FFLAGS) -DUSE_OPENACC=1 -acc -ta=tesla,pin,cc35,cuda7.5,ptxinfo -Minfo=accel $(FREEFLAGS) $<
+	$(FC) -c $(INCLDIR) $(INCS) $(FFLAGS) -DUSE_OPENACC=1 -acc -ta=tesla,pinned,cc35,cuda7.5,ptxinfo -Minfo=accel $(FREEFLAGS) $<
 
 element_mod.o: element_mod.F90
-	$(FC) -c $(INCLDIR) $(INCS) $(FFLAGS) -DUSE_OPENACC=1 -acc -ta=tesla,pin,cc35,cuda7.5,ptxinfo -Minfo=accel $(FREEFLAGS) $<
+	$(FC) -c $(INCLDIR) $(INCS) $(FFLAGS) -DUSE_OPENACC=1 -acc -ta=tesla,pinned,cc35,cuda7.5,ptxinfo -Minfo=accel $(FREEFLAGS) $<
 
 openacc_utils_mod.o: openacc_utils_mod.F90
-	$(FC) -c $(INCLDIR) $(INCS) $(FFLAGS) -DUSE_OPENACC=1 -acc -ta=tesla,pin,cc35,cuda7.5,ptxinfo -Minfo=accel $(FREEFLAGS) $<
+	$(FC) -c $(INCLDIR) $(INCS) $(FFLAGS) -DUSE_OPENACC=1 -acc -ta=tesla,pinned,cc35,cuda7.5,ptxinfo -Minfo=accel $(FREEFLAGS) $<
 
 prim_advance_mod.o: prim_advance_mod.F90
-	$(FC) -c $(INCLDIR) $(INCS) $(FFLAGS) -DUSE_OPENACC=1 -acc -ta=tesla,pin,cc35,cuda7.5,ptxinfo -Minfo=accel $(FREEFLAGS) $<
+	$(FC) -c $(INCLDIR) $(INCS) $(FFLAGS) -DUSE_OPENACC=1 -acc -ta=tesla,pinned,cc35,cuda7.5,ptxinfo -Minfo=accel $(FREEFLAGS) $<
 
 prim_advection_mod.o: prim_advection_mod.F90
-	$(FC) -c $(INCLDIR) $(INCS) $(FFLAGS) -DUSE_OPENACC=1 -acc -ta=tesla,pin,cc35,cuda7.5,ptxinfo -Minfo=accel $(FREEFLAGS) $<
+	$(FC) -c $(INCLDIR) $(INCS) $(FFLAGS) -DUSE_OPENACC=1 -acc -ta=tesla,pinned,cc35,cuda7.5,ptxinfo -Minfo=accel $(FREEFLAGS) $<
 
 prim_si_mod.o: prim_si_mod.F90
-	$(FC) -c $(INCLDIR) $(INCS) $(FFLAGS) -DUSE_OPENACC=1 -acc -ta=tesla,pin,cc35,cuda7.5,ptxinfo -Minfo=accel $(FREEFLAGS) $<
+	$(FC) -c $(INCLDIR) $(INCS) $(FFLAGS) -DUSE_OPENACC=1 -acc -ta=tesla,pinned,cc35,cuda7.5,ptxinfo -Minfo=accel $(FREEFLAGS) $<
 
 solver_init_mod.o: solver_init_mod.F90
-	$(FC) -c $(INCLDIR) $(INCS) $(FFLAGS) -DUSE_OPENACC=1 -acc -ta=tesla,pin,cc35,cuda7.5,ptxinfo -Minfo=accel $(FREEFLAGS) $<
+	$(FC) -c $(INCLDIR) $(INCS) $(FFLAGS) -DUSE_OPENACC=1 -acc -ta=tesla,pinned,cc35,cuda7.5,ptxinfo -Minfo=accel $(FREEFLAGS) $<
 
 vertremap_mod.o: vertremap_mod.F90
-	$(FC) -c $(INCLDIR) $(INCS) $(FFLAGS) -DUSE_OPENACC=1 -acc -ta=tesla,pin,cc35,cuda7.5,ptxinfo -Minfo=accel $(FREEFLAGS) $<
+	$(FC) -c $(INCLDIR) $(INCS) $(FFLAGS) -DUSE_OPENACC=1 -acc -ta=tesla,pinned,cc35,cuda7.5,ptxinfo -Minfo=accel $(FREEFLAGS) $<
 
 viscosity_mod.o: viscosity_mod.F90
-	$(FC) -c $(INCLDIR) $(INCS) $(FFLAGS) -DUSE_OPENACC=1 -acc -ta=tesla,pin,cc35,cuda7.5,ptxinfo -Minfo=accel $(FREEFLAGS) $<
+	$(FC) -c $(INCLDIR) $(INCS) $(FFLAGS) -DUSE_OPENACC=1 -acc -ta=tesla,pinned,cc35,cuda7.5,ptxinfo -Minfo=accel $(FREEFLAGS) $<
 
 prim_driver_mod.o: prim_driver_mod.F90
-	$(FC) -c $(INCLDIR) $(INCS) $(FFLAGS) -DUSE_OPENACC=1 -acc -ta=tesla,pin,cc35,cuda7.5,ptxinfo -Minfo=accel $(FREEFLAGS) $<
+	$(FC) -c $(INCLDIR) $(INCS) $(FFLAGS) -DUSE_OPENACC=1 -acc -ta=tesla,pinned,cc35,cuda7.5,ptxinfo -Minfo=accel $(FREEFLAGS) $<
 
 physics_mod.o: physics_mod.F90
-	$(FC) -c $(INCLDIR) $(INCS) $(FFLAGS) -DUSE_OPENACC=1 -acc -ta=tesla,pin,cc35,cuda7.5,ptxinfo -Minfo=accel $(FREEFLAGS) $<
+	$(FC) -c $(INCLDIR) $(INCS) $(FFLAGS) -DUSE_OPENACC=1 -acc -ta=tesla,pinned,cc35,cuda7.5,ptxinfo -Minfo=accel $(FREEFLAGS) $<
 
 physconst.o: physconst.F90
-	$(FC) -c $(INCLDIR) $(INCS) $(FFLAGS) -DUSE_OPENACC=1 -acc -ta=tesla,pin,cc35,cuda7.5,ptxinfo -Minfo=accel $(FREEFLAGS) $<
+	$(FC) -c $(INCLDIR) $(INCS) $(FFLAGS) -DUSE_OPENACC=1 -acc -ta=tesla,pinned,cc35,cuda7.5,ptxinfo -Minfo=accel $(FREEFLAGS) $<
 
 
 #uwshcu.o: uwshcu.F90
diff --git a/config/acme/machines/config_compilers.xml b/config/acme/machines/config_compilers.xml
index 81f8be3db28..b3c714a447c 100644
--- a/config/acme/machines/config_compilers.xml
+++ b/config/acme/machines/config_compilers.xml
@@ -958,6 +958,7 @@ for mct, etc.
 <compiler COMPILER="pgi" MACH="titan">
   <ADD_CFLAGS DEBUG="FALSE"> -O2 </ADD_CFLAGS>
   <ADD_FFLAGS DEBUG="FALSE"> -O2 </ADD_FFLAGS>
+  <ADD_FFLAGS MODEL="glc"> -target-cpu=istanbul </ADD_FFLAGS>
   <NETCDF_PATH>$(NETCDFROOT)</NETCDF_PATH>
   <PNETCDF_PATH>$(PNETCDFROOT)</PNETCDF_PATH>
   <CONFIG_ARGS> --host=Linux </CONFIG_ARGS>
diff --git a/config/acme/machines/config_machines.xml b/config/acme/machines/config_machines.xml
index d8c7e2cfaa8..50cd619263f 100644
--- a/config/acme/machines/config_machines.xml
+++ b/config/acme/machines/config_machines.xml
@@ -2222,10 +2222,6 @@
         <env name="CRAY_CPU_TARGET">istanbul</env>
         <env name="CRAY_CUDA_MPS">1</env>
       </environment_variables>
-      <environment_variables compiler="pgi">
-        <!-- NOTE(wjs, 2015-03-12) The following line is needed for bit-for-bit reproducibility -->
-        <env name="CRAY_CPU_TARGET">istanbul</env>
-      </environment_variables>
       <environment_variables compiler="intel">
         <env name="CRAYPE_LINK_TYPE">dynamic</env>
       </environment_variables>