diff --git a/.gitmodules b/.gitmodules
index b74aac6f02..69c521f4f7 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -80,7 +80,7 @@
 	url = https://github.com/MPAS-Dev/MPAS-Model.git
         fxrequired = AlwaysRequired
         fxsparse = ../.mpas_sparse_checkout
-        fxtag = b8c33daa
+        fxtag = v8.2.1
 	fxDONOTUSEurl = https://github.com/MPAS-Dev/MPAS-Model.git
 
 [submodule "cosp2"]
diff --git a/doc/ChangeLog b/doc/ChangeLog
index 06acd1fa7f..294d616fc7 100644
--- a/doc/ChangeLog
+++ b/doc/ChangeLog
@@ -1,5 +1,71 @@
 ===============================================================
 
+Tag name: cam6_4_036
+Originator(s): gdicker
+Date: Sep 24, 2024
+One-line Summary: Update MPAS-A to v8.2.1
+Github PR URL: https://github.com/ESCOMP/CAM/pull/1145
+
+Purpose of changes (include the issue number and title text for each relevant GitHub issue):
+- Update MPAS-A within CAM to 'v8.2.1'  https://github.com/ESCOMP/CAM/issue/1144
+
+Describe any changes made to build system:
+
+Describe any changes made to the namelist:
+
+List any changes to the defaults for the boundary datasets:
+
+Describe any substantial timing or memory changes:
+
+Code reviewed by:
+
+List all files eliminated:
+
+List all files added and what they do:
+
+List all existing files that have been modified, and describe the changes:
+M       .gitmodules
+ - Update the mpas fxTag to v8.2.1
+
+M      src/dynamics/mpas/Makefile
+ - Add rules to build stream_inquiry and mpas_stream_inquiry
+ - Pass CPPFLAGS to the registry command
+ - Edit CPPFLAGS: add MPAS_BUILD_TARGET and add the GIT_VERSION using a shell command
+ - Also a commented out addition to enable mpi_f08 support in MPAS
+
+M      src/dynamics/mpas/driver/cam_mpas_subdriver.F90
+ - Add streamInfo to the MPAS domain_ptr
+ - Modify function calls for updated variables
+ - Optional mpi_f08 change
+
+If there were any failures reported from running test_driver.sh on any test
+platform, and checkin with these failures has been OK'd by the gatekeeper,
+then copy the lines from the td.*.status files for the failed tests to the
+appropriate machine below.  All failed tests must be justified.
+
+derecho/intel/aux_cam:
+
+  FAIL ERP_Ln9.f09_f09_mg17.FCSD_HCO.derecho_intel.cam-outfrq9s COMPARE_base_rest
+  FAIL SMS_Ld1.f09_f09_mg17.FCHIST_GC.derecho_intel.cam-outfrq1d ... DIFF
+ - pre-existing failure due to HEMCO not having reproducible results issues #1018 and #856
+
+  PEND SMS_D_Ln9_P1280x1.ne0CONUSne30x8_ne0CONUSne30x8_mt12.FCHIST.derecho_intel.cam-outfrq9s
+ - pre-existing failures -- need fix in CLM external
+
+derecho/nvhpc/aux_cam: ALL PASS
+
+izumi/nag/aux_cam:
+
+  FAIL DAE.f45_f45_mg37.FHS94.izumi_nag.cam-dae
+ - pre-existing failure - issue #670
+
+izumi/gnu/aux_cam: ALL PASS
+
+Summarize any changes to answers: bit-for-bit
+
+===============================================================
+===============================================================
+
 Tag name: cam6_4_035
 Originator(s): fvitt
 Date: 23 Sep 2024
diff --git a/src/dynamics/mpas/Makefile b/src/dynamics/mpas/Makefile
index 216be0ff1a..f79b718aa0 100644
--- a/src/dynamics/mpas/Makefile
+++ b/src/dynamics/mpas/Makefile
@@ -1,10 +1,13 @@
-CPPFLAGS := -D_MPI -DMPAS_NATIVE_TIMERS -DMPAS_GIT_VERSION=unknown -DMPAS_NAMELIST_SUFFIX=atmosphere -DMPAS_CAM_DYCORE -DMPAS_PIO_SUPPORT -DMPAS_NO_ESMF_INIT
+GIT_VERSION=$(shell git -C "$(MPAS_SRC_ROOT)/dycore" describe --always --dirty --tags || echo "N/A" )
+CPPFLAGS := -D_MPI -DMPAS_NATIVE_TIMERS -DMPAS_CAM_DYCORE -DMPAS_PIO_SUPPORT -DMPAS_NO_ESMF_INIT -DMPAS_GIT_VERSION="$(GIT_VERSION)" -DMPAS_BUILD_TARGET="N/A" -DMPAS_NAMELIST_SUFFIX="atmosphere"
 ifdef PIODEF
   CPPFLAGS += $(PIODEF)
 endif
 ifeq ($(strip $(COMP_INTERFACE)),nuopc)
   CPPFLAGS += -DMPAS_EXTERNAL_ESMF_LIB
 endif
+# Uncomment next line to enable MPAS to use mpi_f08 module
+#CPPFLAGS += -DMPAS_USE_MPI_F08
 
 REGISTRY_FILE := $(MPAS_SRC_ROOT)/dycore/src/core_atmosphere/Registry.xml
 
@@ -80,6 +83,8 @@ FRAME_OBJS = \
 	mpas_io_streams.o \
 	mpas_bootstrapping.o \
 	mpas_io_units.o \
+	mpas_stream_inquiry.o \
+	stream_inquiry.o \
 	mpas_stream_manager.o \
 	mpas_stream_list.o \
 	mpas_forcing.o \
@@ -179,6 +184,8 @@ mpas_io_units.o: mpas_kind_types.o
 
 mpas_threading.o: mpas_kind_types.o
 
+mpas_stream_inquiry.o: mpas_derived_types.o mpas_log.o mpas_c_interfacing.o stream_inquiry.o
+
 mpas_stream_list.o: mpas_derived_types.o mpas_kind_types.o mpas_io_streams.o mpas_timekeeping.o regex_matching.o mpas_log.o
 
 mpas_stream_manager.o: mpas_io_streams.o mpas_timekeeping.o mpas_derived_types.o mpas_kind_types.o mpas_c_interfacing.o mpas_stream_list.o mpas_dmpar.o mpas_io.o mpas_threading.o mpas_log.o
@@ -226,7 +233,7 @@ streams_gen: $(STREAMS_GEN_OBJS) ezxml.o
 #
 incs: $(REGISTRY_FILE)
 	( cpp -P -traditional $(CPPFLAGS) -I$(MPAS_SRC_ROOT)/dycore/src/core_atmosphere/diagnostics $(REGISTRY_FILE) > Registry_processed.xml )
-	( ./registry Registry_processed.xml )
+	( ./registry Registry_processed.xml $(CPPFLAGS) )
 
 #
 # Dycore
diff --git a/src/dynamics/mpas/driver/cam_mpas_subdriver.F90 b/src/dynamics/mpas/driver/cam_mpas_subdriver.F90
index 676bacd4af..59d9c462ee 100644
--- a/src/dynamics/mpas/driver/cam_mpas_subdriver.F90
+++ b/src/dynamics/mpas/driver/cam_mpas_subdriver.F90
@@ -73,13 +73,20 @@ end subroutine halt_model
     !-----------------------------------------------------------------------
     subroutine cam_mpas_init_phase1(mpicom, endrun, logUnits, realkind)
 
+#ifdef MPAS_USE_MPI_F08
+       use mpi_f08, only : mpi_comm_type => mpi_comm
+#endif
        use mpas_domain_routines, only : mpas_allocate_domain
        use mpas_framework, only : mpas_framework_init_phase1
        use atm_core_interface, only : atm_setup_core, atm_setup_domain
        use mpas_kind_types, only : RKIND
 
        ! Dummy argument
+#ifdef MPAS_USE_MPI_F08
+       type(mpi_comm_type), intent(in) :: mpicom
+#else
        integer, intent(in) :: mpicom
+#endif
        procedure(halt_model) :: endrun
        integer, dimension(2), intent(in) :: logUnits
        integer, intent(in) :: realkind
@@ -108,7 +115,7 @@ subroutine cam_mpas_init_phase1(mpicom, endrun, logUnits, realkind)
        !
        ! Initialize MPAS infrastructure (principally, the mpas_dmpar module)
        !
-       call mpas_framework_init_phase1(domain_ptr % dminfo, mpi_comm=mpicom)
+       call mpas_framework_init_phase1(domain_ptr % dminfo, external_comm=mpicom)
 
        call atm_setup_core(corelist)
        call atm_setup_domain(domain_ptr)
@@ -152,6 +159,7 @@ subroutine cam_mpas_init_phase2(pio_subsystem, endrun, cam_calendar)
 
        use mpas_framework, only : mpas_framework_init_phase2
        use mpas_timer, only : mpas_timer_start
+       use mpas_stream_inquiry, only : mpas_stream_inquiry_new_streaminfo
 
        type (iosystem_desc_t), pointer :: pio_subsystem
        procedure(halt_model) :: endrun
@@ -181,12 +189,20 @@ subroutine cam_mpas_init_phase2(pio_subsystem, endrun, cam_calendar)
 
        call mpas_timer_start('total time')
 
+       ! Since MPAS is being used as a dycore and is not responsible for IO, it's enough to create this
+       ! object without running its init(). Any queries made to it will always return `.false.`
+       domain_ptr % streamInfo => mpas_stream_inquiry_new_streaminfo()
+       if (.not. associated(domain_ptr % streamInfo)) then
+          call endrun(subname//': FATAL: streamInfo instantiation failed for core '//trim(domain_ptr % core % coreName))
+       end if
+
        ierr = domain_ptr % core % define_packages(domain_ptr % packages)
        if ( ierr /= 0 ) then
           call endrun(subname//': FATAL: Package definition failed for core '//trim(domain_ptr % core % coreName))
        end if
 
-       ierr = domain_ptr % core % setup_packages(domain_ptr % configs, domain_ptr % packages, domain_ptr % iocontext)
+       ierr = domain_ptr % core % setup_packages(domain_ptr % configs, domain_ptr % streamInfo, &
+                                                 domain_ptr % packages, domain_ptr % iocontext)
        if ( ierr /= 0 ) then
           call endrun(subname//': FATAL: Package setup failed for core '//trim(domain_ptr % core % coreName))
        end if
@@ -2353,6 +2369,7 @@ subroutine cam_mpas_finalize()
        !
        ! Finalize infrastructure
        !
+       deallocate(domain_ptr % streamInfo) ! created by mpas_stream_inquiry_new_streaminfo
 
        ! Print out log stats and close log file
        !   (Do this after timer stats are printed and stream mgr finalized,
diff --git a/src/dynamics/mpas/dycore b/src/dynamics/mpas/dycore
index b8c33daa4b..b566fc8a95 160000
--- a/src/dynamics/mpas/dycore
+++ b/src/dynamics/mpas/dycore
@@ -1 +1 @@
-Subproject commit b8c33daa4b124f116b0ba1b1386968c4c15b42e4
+Subproject commit b566fc8a959390d838aba08fd03c81edae986f6a