cam6_4_101: Write cam_in%cflx for all constituents, not just Q

doc/ChangeLog

@@ -1,5 +1,57 @@
 ===============================================================
 
+Tag name: cam6_4_101
+Originator(s): jimmielin
+Date: July 1, 2025
+One-line Summary: Write cam_in%cflx for all constituents in snapshots, not just Q
+Github PR URL: https://github.com/ESCOMP/CAM/pull/1336
+
+Purpose of changes (include the issue number and title text for each relevant GitHub issue):
+- For CAM snaphots, write cam_in%cflx for all constituents instead of just Q as it was declared horiz_only. Now write out as cam_in_cflx_(constituent name) - https://github.com/ESCOMP/CAM/issues/1335
+
+Describe any changes made to build system: N/A
+
+Describe any changes made to the namelist: N/A
+
+List any changes to the defaults for the boundary datasets: N/A
+
+Describe any substantial timing or memory changes: N/A
+
+Code reviewed by: cacraig
+
+List all files eliminated: N/A
+
+List all files added and what they do: N/A
+
+List all existing files that have been modified, and describe the changes:
+M       src/control/cam_snapshot_common.F90
+  - fix #1335
+M       src/control/cam_history.F90
+  - fix typo in comment
+
+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:
+
+SMS_D_Ln9_P1280x1.ne0CONUSne30x8_ne0CONUSne30x8_mt12.FCHIST.derecho_intel.cam-outfrq9s (Overall: FAIL)
+- pre-existing failure due to build-namelist error requiring CLM/CTSM external update
+
+derecho/nvhpc/aux_cam: All PASS
+
+izumi/nag/aux_cam: All PASS
+
+izumi/gnu/aux_cam: All PASS
+
+CAM tag used for the baseline comparison tests if different than previous
+tag:
+
+Summarize any changes to answers: B4B - only new fields to snapshots
+
+===============================================================
+
 Tag name: cam6_4_100
 Originator(s): peverwhee, gdicker1
 Date: 26 June 2025
@@ -69,7 +121,7 @@ Github PR URL: https://github.com/ESCOMP/CAM/pull/1331
 
 Purpose of changes (include the issue number and title text for each relevant GitHub issue):
 
-. Resolve #1329 - Create an F compset for CAM4 
+. Resolve #1329 - Create an F compset for CAM4
   - Add compset FHIST_C4
 
 . Modify some MPAS tests.
@@ -79,7 +131,7 @@ Purpose of changes (include the issue number and title text for each relevant Gi
 . Resolve #1332 - ne0ARCTICne30x4 test fails with 1280 tasks and fixed CTSM,
                   because of too few processors
   - increase pe count from 1280 to 1920.  Make this the default in the
-    config_pes.xml file. 
+    config_pes.xml file.
 
 . Resolve #1326 - Add MPAS-O and MPAS-SI from EarthWorksOrg/EarthWorks
   - add "mpaso" as a valid value in the configure definition file
@@ -157,7 +209,7 @@ cime_config/testdefs/testlist_cam.xml
   ERC_D_Ln9.f10_f10_mg37.QPC5.izumi_gnu.cam-outfrq3s_unicon
 . Increase PEs for ARCTIC test by modifying config_pes.xml and remove the
   specification from the test definition.
-  Replace 
+  Replace
   SMS_D_Ln9_P1280x1.ne0CONUSne30x8_ne0CONUSne30x8_mt12.FCHIST.derecho_intel.cam-outfrq9s
   by
   SMS_D_Ln9.ne0CONUSne30x8_ne0CONUSne30x8_mt12.FCHIST.derecho_intel.cam-outfrq9s

src/control/cam_history.F90

@@ -7023,7 +7023,7 @@ end subroutine cam_history_snapshot_deactivate
 
   subroutine cam_history_snapshot_activate(name, tape)
 
-  ! This subroutine activates (set aftflag to true) for the requested tape number
+  ! This subroutine activates (set actflag to true) for the requested tape number
 
   character(len=*), intent(in) :: name
   integer,          intent(in) :: tape

src/control/cam_snapshot_common.F90

@@ -433,9 +433,16 @@ subroutine cam_in_snapshot_init(cam_snapshot_before_num, cam_snapshot_after_num,
 ! This subroutine does the addfld calls for cam_in fields
 !--------------------------------------------------------
 
+   use constituents, only: cnst_name
+
    type(cam_in_t), intent(in) :: cam_in
 
-   integer,intent(in) :: cam_snapshot_before_num, cam_snapshot_after_num
+   integer, intent(in) :: cam_snapshot_before_num, cam_snapshot_after_num
+
+   ! for constituent loop.
+   integer :: mcnst
+   character(len=64)  :: fname
+   character(len=128) :: lname
 
    ncam_in_var = 0
 
@@ -464,8 +471,15 @@ subroutine cam_in_snapshot_init(cam_snapshot_before_num, cam_snapshot_after_num,
    call snapshot_addfld( ncam_in_var, cam_in_snapshot,  cam_snapshot_before_num, cam_snapshot_after_num, &
      'cam_in%shf',             'cam_in_shf',               'unset',          horiz_only)
 
-   call snapshot_addfld( ncam_in_var, cam_in_snapshot,  cam_snapshot_before_num, cam_snapshot_after_num, &
-     'cam_in%cflx',            'cam_in_cflx',              'unset',          horiz_only)
+   ! cam_in%cflx is sized (pcols, pcnst); because the constituent indices at the model that reads this
+   ! data may not match the indices in the model outputting the snapshot,
+   ! cam_in%cflx is split into a series of snapshot variables cam_in_cflx_(constituent name).
+   do mcnst = 1, pcnst
+      fname = 'cam_in_cflx_'//trim(cnst_name(mcnst))
+      lname = 'cam_in_cflx_'//trim(cnst_name(mcnst))
+      call snapshot_addfld( ncam_in_var, cam_in_snapshot,  cam_snapshot_before_num, cam_snapshot_after_num, &
+                            fname, lname, 'kg m-2 s-1', horiz_only)
+   enddo
 
    call snapshot_addfld( ncam_in_var, cam_in_snapshot,  cam_snapshot_before_num, cam_snapshot_after_num, &
      'cam_in%wsx',             'cam_in_wsx',               'unset',          horiz_only)
@@ -988,11 +1002,15 @@ end subroutine tend_snapshot_all_outfld
 
 subroutine cam_in_snapshot_all_outfld(lchnk, file_num, cam_in)
 
+   use constituents, only: cnst_name
+
    integer,         intent(in)  :: lchnk
    integer,         intent(in)  :: file_num
    type(cam_in_t),  intent(in)  :: cam_in
 
    integer :: i
+   integer :: mcnst
+   character(len=64) :: fname
 
    do i=1, ncam_in_var
 
@@ -1057,14 +1075,27 @@ subroutine cam_in_snapshot_all_outfld(lchnk, file_num, cam_in)
          call outfld(cam_in_snapshot(i)%standard_name, cam_in%dstflx, pcols, lchnk)
 
       case default
-         call endrun('ERROR in cam_in_snapshot_all_outfld: no match found for '//trim(cam_in_snapshot(i)%ddt_string))
+         if (cam_in_snapshot(i)%ddt_string(1:12) == 'cam_in_cflx_') then
+            ! This case is handled below in a loop (not looked up here as it would be i*pcnst iterations)
+         else
+            call endrun('ERROR in cam_in_snapshot_all_outfld: no match found for '//trim(cam_in_snapshot(i)%ddt_string))
+         endif
 
       end select
 
       call cam_history_snapshot_deactivate(trim(cam_in_snapshot(i)%standard_name))
 
    end do
 
+   ! Handle cam_in%cflx constituent loop
+   do mcnst = 1, pcnst
+      fname = 'cam_in_cflx_'//trim(cnst_name(mcnst))
+
+      call cam_history_snapshot_activate(trim(fname), file_num)
+      call outfld(fname, cam_in%cflx(:,mcnst), pcols, lchnk)
+      call cam_history_snapshot_deactivate(trim(fname))
+   end do
+
 end subroutine cam_in_snapshot_all_outfld
 
 subroutine cam_out_snapshot_all_outfld(lchnk, file_num, cam_out)