diff --git a/Makefile b/Makefile
index b569fe250..a73b8ddd9 100644
--- a/Makefile
+++ b/Makefile
@@ -23,10 +23,13 @@ xlf:
 	"LDFLAGS_DEBUG = -O0 -g" \
 	"FFLAGS_OMP = -qsmp=omp" \
 	"CFLAGS_OMP = -qsmp=omp" \
+	"FFLAGS_ACC =" \
+	"CFLAGS_ACC =" \
 	"CORE = $(CORE)" \
 	"DEBUG = $(DEBUG)" \
 	"USE_PAPI = $(USE_PAPI)" \
 	"OPENMP = $(OPENMP)" \
+	"OPENACC = $(OPENACC)" \
 	"CPPFLAGS = $(MODEL_FORMULATION) -D_MPI" )
  
 ftn:
@@ -44,10 +47,13 @@ ftn:
 	"LDFLAGS_OPT = " \
 	"FFLAGS_OMP = -mp" \
 	"CFLAGS_OMP = -mp" \
+	"FFLAGS_ACC =" \
+	"CFLAGS_ACC =" \
 	"CORE = $(CORE)" \
 	"DEBUG = $(DEBUG)" \
 	"USE_PAPI = $(USE_PAPI)" \
 	"OPENMP = $(OPENMP)" \
+	"OPENACC = $(OPENACC)" \
 	"CPPFLAGS = $(MODEL_FORMULATION) -D_MPI -DUNDERSCORE" )
 
 titan-cray:
@@ -62,10 +68,13 @@ titan-cray:
 	"LDFLAGS_OPT = -O3" \
 	"FFLAGS_OMP = " \
 	"CFLAGS_OMP = " \
+	"FFLAGS_ACC =" \
+	"CFLAGS_ACC =" \
 	"CORE = $(CORE)" \
 	"DEBUG = $(DEBUG)" \
 	"USE_PAPI = $(USE_PAPI)" \
 	"OPENMP = $(OPENMP)" \
+	"OPENACC = $(OPENACC)" \
 	"CPPFLAGS = $(MODEL_FORMULATION) -D_MPI -DUNDERSCORE" )
 
 pgi:
@@ -87,10 +96,13 @@ pgi:
 	"LDFLAGS_DEBUG = -O0 -g -Mbounds -Mchkptr -Ktrap=divz,fp,inv,ovf -traceback" \
 	"FFLAGS_OMP = -mp" \
 	"CFLAGS_OMP = -mp" \
+	"FFLAGS_ACC = -Mnofma -acc -ta=tesla:cc60 -Minfo" \
+	"CFLAGS_ACC =" \
 	"CORE = $(CORE)" \
 	"DEBUG = $(DEBUG)" \
 	"USE_PAPI = $(USE_PAPI)" \
 	"OPENMP = $(OPENMP)" \
+	"OPENACC = $(OPENACC)" \
 	"CPPFLAGS = $(MODEL_FORMULATION) -D_MPI -DUNDERSCORE" )
 
 pgi-nersc:
@@ -108,10 +120,13 @@ pgi-nersc:
 	"LDFLAGS_OPT = -O3" \
 	"FFLAGS_OMP = -mp" \
 	"CFLAGS_OMP = -mp" \
+	"FFLAGS_ACC =" \
+	"CFLAGS_ACC =" \
 	"CORE = $(CORE)" \
 	"DEBUG = $(DEBUG)" \
 	"USE_PAPI = $(USE_PAPI)" \
 	"OPENMP = $(OPENMP)" \
+	"OPENACC = $(OPENACC)" \
 	"CPPFLAGS = $(MODEL_FORMULATION) -D_MPI -DUNDERSCORE" )
 
 pgi-llnl:
@@ -129,10 +144,13 @@ pgi-llnl:
 	"LDFLAGS_OPT = " \
 	"FFLAGS_OMP = -mp" \
 	"CFLAGS_OMP = -mp" \
+	"FFLAGS_ACC =" \
+	"CFLAGS_ACC =" \
 	"CORE = $(CORE)" \
 	"DEBUG = $(DEBUG)" \
 	"USE_PAPI = $(USE_PAPI)" \
 	"OPENMP = $(OPENMP)" \
+	"OPENACC = $(OPENACC)" \
 	"CPPFLAGS = $(MODEL_FORMULATION) -D_MPI -DUNDERSCORE" )
 
 ifort:
@@ -154,10 +172,13 @@ ifort:
 	"LDFLAGS_DEBUG = -g -fpe0 -traceback" \
 	"FFLAGS_OMP = -qopenmp" \
 	"CFLAGS_OMP = -qopenmp" \
+	"FFLAGS_ACC =" \
+	"CFLAGS_ACC =" \
 	"CORE = $(CORE)" \
 	"DEBUG = $(DEBUG)" \
 	"USE_PAPI = $(USE_PAPI)" \
 	"OPENMP = $(OPENMP)" \
+	"OPENACC = $(OPENACC)" \
 	"CPPFLAGS = $(MODEL_FORMULATION) -D_MPI -DUNDERSCORE" )
 
 ifort-scorep:
@@ -179,10 +200,13 @@ ifort-scorep:
 	"LDFLAGS_DEBUG = -g -fpe0 -traceback" \
 	"FFLAGS_OMP = -qopenmp" \
 	"CFLAGS_OMP = -qopenmp" \
+	"FFLAGS_ACC =" \
+	"CFLAGS_ACC =" \
 	"CORE = $(CORE)" \
 	"DEBUG = $(DEBUG)" \
 	"USE_PAPI = $(USE_PAPI)" \
 	"OPENMP = $(OPENMP)" \
+	"OPENACC = $(OPENACC)" \
 	"CPPFLAGS = $(MODEL_FORMULATION) -D_MPI -DUNDERSCORE" )
 
 ifort-gcc:
@@ -204,10 +228,13 @@ ifort-gcc:
 	"LDFLAGS_DEBUG = -g -fpe0 -traceback" \
 	"FFLAGS_OMP = -qopenmp" \
 	"CFLAGS_OMP = -fopenmp" \
+	"FFLAGS_ACC =" \
+	"CFLAGS_ACC =" \
 	"CORE = $(CORE)" \
 	"DEBUG = $(DEBUG)" \
 	"USE_PAPI = $(USE_PAPI)" \
 	"OPENMP = $(OPENMP)" \
+	"OPENACC = $(OPENACC)" \
 	"CPPFLAGS = $(MODEL_FORMULATION) -D_MPI -DUNDERSCORE" )
 
 gfortran:
@@ -229,10 +256,13 @@ gfortran:
 	"LDFLAGS_DEBUG = -g -m64" \
 	"FFLAGS_OMP = -fopenmp" \
 	"CFLAGS_OMP = -fopenmp" \
+	"FFLAGS_ACC =" \
+	"CFLAGS_ACC =" \
 	"CORE = $(CORE)" \
 	"DEBUG = $(DEBUG)" \
 	"USE_PAPI = $(USE_PAPI)" \
 	"OPENMP = $(OPENMP)" \
+	"OPENACC = $(OPENACC)" \
 	"CPPFLAGS = $(MODEL_FORMULATION) -D_MPI -DUNDERSCORE" )
 
 gfortran-clang:
@@ -254,10 +284,13 @@ gfortran-clang:
 	"LDFLAGS_DEBUG = -g -m64" \
 	"FFLAGS_OMP = -fopenmp" \
 	"CFLAGS_OMP = -fopenmp" \
+	"FFLAGS_ACC =" \
+	"CFLAGS_ACC =" \
 	"CORE = $(CORE)" \
 	"DEBUG = $(DEBUG)" \
 	"USE_PAPI = $(USE_PAPI)" \
 	"OPENMP = $(OPENMP)" \
+	"OPENACC = $(OPENACC)" \
 	"CPPFLAGS = $(MODEL_FORMULATION) -D_MPI -DUNDERSCORE" )
 
 g95:
@@ -275,10 +308,13 @@ g95:
 	"LDFLAGS_OPT = -O3" \
 	"FFLAGS_OMP = -fopenmp" \
 	"CFLAGS_OMP = -fopenmp" \
+	"FFLAGS_ACC =" \
+	"CFLAGS_ACC =" \
 	"CORE = $(CORE)" \
 	"DEBUG = $(DEBUG)" \
 	"USE_PAPI = $(USE_PAPI)" \
 	"OPENMP = $(OPENMP)" \
+	"OPENACC = $(OPENACC)" \
 	"CPPFLAGS = $(MODEL_FORMULATION) -D_MPI -DUNDERSCORE" )
 
 pathscale-nersc:
@@ -296,10 +332,13 @@ pathscale-nersc:
 	"LDFLAGS_OPT = -O3" \
 	"FFLAGS_OMP = -mp" \
 	"CFLAGS_OMP = -mp" \
+	"FFLAGS_ACC =" \
+	"CFLAGS_ACC =" \
 	"CORE = $(CORE)" \
 	"DEBUG = $(DEBUG)" \
 	"USE_PAPI = $(USE_PAPI)" \
 	"OPENMP = $(OPENMP)" \
+	"OPENACC = $(OPENACC)" \
 	"CPPFLAGS = $(MODEL_FORMULATION) -D_MPI -DUNDERSCORE" )
 
 cray-nersc:
@@ -317,10 +356,13 @@ cray-nersc:
 	"LDFLAGS_OPT = -O3" \
 	"FFLAGS_OMP = " \
 	"CFLAGS_OMP = " \
+	"FFLAGS_ACC =" \
+	"CFLAGS_ACC =" \
 	"CORE = $(CORE)" \
 	"DEBUG = $(DEBUG)" \
 	"USE_PAPI = $(USE_PAPI)" \
 	"OPENMP = $(OPENMP)" \
+	"OPENACC = $(OPENACC)" \
 	"CPPFLAGS = $(MODEL_FORMULATION) -D_MPI -DUNDERSCORE" )
 
 gnu-nersc:
@@ -361,6 +403,8 @@ intel-nersc:
 	"LDFLAGS_OPT = -O3" \
 	"FFLAGS_OMP = -qopenmp" \
 	"CFLAGS_OMP = -qopenmp" \
+	"FFLAGS_ACC =" \
+	"CFLAGS_ACC =" \
 	"FFLAGS_DEBUG = -real-size 64 -g -convert big_endian -FR -CU -CB -check all -gen-interfaces -warn interfaces -traceback" \
 	"CFLAGS_DEBUG = -g -traceback" \
 	"CXXFLAGS_DEBUG = -g -traceback" \
@@ -369,6 +413,7 @@ intel-nersc:
 	"DEBUG = $(DEBUG)" \
 	"USE_PAPI = $(USE_PAPI)" \
 	"OPENMP = $(OPENMP)" \
+	"OPENACC = $(OPENACC)" \
 	"CPPFLAGS = $(MODEL_FORMULATION) -D_MPI -DUNDERSCORE" )
 
 bluegene:
@@ -390,10 +435,13 @@ bluegene:
 	"LDFLAGS_DEBUG = -O0 -g" \
 	"FFLAGS_OMP = -qsmp=omp" \
 	"CFLAGS_OMP = -qsmp=omp" \
+	"FFLAGS_ACC =" \
+	"CFLAGS_ACC =" \
 	"CORE = $(CORE)" \
 	"DEBUG = $(DEBUG)" \
 	"USE_PAPI = $(USE_PAPI)" \
 	"OPENMP = $(OPENMP)" \
+	"OPENACC = $(OPENACC)" \
 	"CPPFLAGS = $(MODEL_FORMULATION) -D_MPI" )
 
 CPPINCLUDES = 
@@ -514,6 +562,13 @@ ifeq "$(OPENMP)" "true"
 	LDFLAGS += $(FFLAGS_OMP)
 endif #OPENMP IF
 
+ifeq "$(OPENACC)" "true"
+	FFLAGS += $(FFLAGS_ACC)
+	CFLAGS += $(CFLAGS_ACC)
+	override CPPFLAGS += "-DMPAS_OPENACC"
+	LDFLAGS += $(FFLAGS_ACC)
+endif #OPENACC IF
+
 ifeq "$(PRECISION)" "single"
 	CFLAGS += "-DSINGLE_PRECISION"
 	CXXFLAGS += "-DSINGLE_PRECISION"
@@ -586,6 +641,12 @@ else
 	OPENMP_MESSAGE="MPAS was built without OpenMP support."
 endif
 
+ifeq "$(OPENACC)" "true"
+	OPENACC_MESSAGE="MPAS was built with OpenACC enabled."
+else
+	OPENACC_MESSAGE="MPAS was built without OpenACC support."
+endif
+
 ifneq ($(wildcard .mpas_core_*), ) # CHECK FOR BUILT CORE
 
 ifneq ($(wildcard .mpas_core_$(CORE)), ) # CHECK FOR SAME CORE AS ATTEMPTED BUILD.
@@ -686,6 +747,10 @@ ifeq "$(OPENMP)" "true"
 	@rm -fr conftest.*
 endif
 
+ifeq "$(OPENACC)" "true"
+	@echo "Testing compiler for OpenACC support"
+endif
+
 
 mpas_main: compiler_test
 ifeq "$(AUTOCLEAN)" "true"
@@ -723,6 +788,7 @@ endif
 	@echo $(PAPI_MESSAGE)
 	@echo $(TAU_MESSAGE)
 	@echo $(OPENMP_MESSAGE)
+	@echo $(OPENACC_MESSAGE)
 ifeq "$(AUTOCLEAN)" "true"
 	@echo $(AUTOCLEAN_MESSAGE)
 endif
@@ -804,6 +870,7 @@ errmsg:
 	@echo "                    TIMER_LIB=gptl - Uses gptl for the timer interface instead of the native interface"
 	@echo "                    TIMER_LIB=tau - Uses TAU for the timer interface instead of the native interface"
 	@echo "    OPENMP=true   - builds and links with OpenMP flags. Default is to not use OpenMP."
+	@echo "    OPENACC=true  - builds and links with OpenACC flags. Default is to not use OpenACC."
 	@echo "    USE_PIO2=true - links with the PIO 2 library. Default is to use the PIO 1.x library."
 	@echo "    PRECISION=single - builds with default single-precision real kind. Default is to use double-precision."
 	@echo ""
diff --git a/src/Makefile b/src/Makefile
index d5f158404..b0004ba4d 100644
--- a/src/Makefile
+++ b/src/Makefile
@@ -15,7 +15,7 @@ endif
 all: mpas
 
 mpas: $(AUTOCLEAN_DEPS) externals frame ops dycore drver
-	$(LINKER) $(LDFLAGS) -o $(EXE_NAME) driver/*.o -L. -ldycore -lops -lframework $(LIBS) -I./external/esmf_time_f90 -L./external/esmf_time_f90 -lesmf_time -r8 -O3 -byteswapio -Mfree -m64 -Mnofma -acc -ta=tesla:cc60
+	$(LINKER) $(LDFLAGS) -o $(EXE_NAME) driver/*.o -L. -ldycore -lops -lframework $(LIBS) -I./external/esmf_time_f90 -L./external/esmf_time_f90 -lesmf_time
 
 externals: $(AUTOCLEAN_DEPS)
 	( cd external; $(MAKE) FC="$(FC)" SFC="$(SFC)" CC="$(CC)" SCC="$(SCC)" FFLAGS="$(FFLAGS)" CFLAGS="$(CFLAGS)" CPP="$(CPP)" NETCDF="$(NETCDF)" CORE="$(CORE)" all )
diff --git a/src/core_atmosphere/dynamics/Makefile b/src/core_atmosphere/dynamics/Makefile
index 761ca07bc..97785deb4 100644
--- a/src/core_atmosphere/dynamics/Makefile
+++ b/src/core_atmosphere/dynamics/Makefile
@@ -18,5 +18,5 @@ ifeq "$(GEN_F90)" "true"
 	$(CPP) $(CPPFLAGS) $(PHYSICS) $(CPPINCLUDES) $< > $*.f90
 	$(FC) $(FFLAGS) -c $*.f90 $(FCINCLUDES) -I.. -I../../framework -I../../operators -I../physics -I../physics/physics_wrf -I../../external/esmf_time_f90
 else
-	$(FC) $(CPPFLAGS) $(PHYSICS) $(FFLAGS) -c $*.F $(CPPINCLUDES) $(FCINCLUDES) -I.. -I../../framework -I../../operators -I../physics -I../physics/physics_wrf -I../../external/esmf_time_f90 -r8 -O3 -byteswapio -Mfree -m64 -Mnofma -acc -ta=tesla:cc60 -Minfo
+	$(FC) $(CPPFLAGS) $(PHYSICS) $(FFLAGS) -c $*.F $(CPPINCLUDES) $(FCINCLUDES) -I.. -I../../framework -I../../operators -I../physics -I../physics/physics_wrf -I../../external/esmf_time_f90
 endif
diff --git a/src/core_atmosphere/dynamics/mpas_atm_time_integration.F b/src/core_atmosphere/dynamics/mpas_atm_time_integration.F
index 42c639d7d..41e5d401a 100644
--- a/src/core_atmosphere/dynamics/mpas_atm_time_integration.F
+++ b/src/core_atmosphere/dynamics/mpas_atm_time_integration.F
@@ -26,7 +26,11 @@ module atm_time_integration
 #endif
 
    use mpas_atm_iau  
+
+#ifdef MPAS_OPENACC
    use openacc
+#endif
+
    integer :: timerid, secs, u_secs
 
    ! Used to store physics tendencies for dynamics variables
@@ -211,11 +215,15 @@ subroutine atm_srk3(domain, dt, itimestep)
       real (kind=RKIND), dimension(:,:), pointer :: gpu_rtheta_pp, gpu_u_1, gpu_u_2, gpu_w_1, gpu_w_2
       real (kind=RKIND), dimension(:,:), pointer :: gpu_tend_u, gpu_ru_p, gpu_rw_p, gpu_rho_pp, gpu_pv_edge, gpu_rho_edge
       real (kind=RKIND), dimension(:,:,:), pointer :: gpu_scalars_1
+
+#ifdef MPAS_OPENACC
       integer :: rrpk_rank, rrpk_devices, rrpk_local_gpu_id
       rrpk_rank = domain % dminfo % my_proc_id
       rrpk_devices =  acc_get_num_devices(acc_device_nvidia)
       rrpk_local_gpu_id = mod(rrpk_rank,rrpk_devices)
       call acc_set_device_num(rrpk_local_gpu_id,acc_device_nvidia)
+#endif
+
       !
       ! Retrieve configuration options
       !