ChangeLog draft

Author: fvitt

cime

@@ -1,5 +1,128 @@
 ===============================================================
 
+Tag name: cam6_4_077
+Originator(s): fvitt
+Date: 17 Mar 2025
+One-line Summary: Introduce HIST WACCM7(X) compsets
+Github PR URL: https://github.com/ESCOMP/CAM/pull/1262
+
+Purpose of changes (include the issue number and title text for each relevant GitHub issue):
+
+ Add WACCM(X)7 compsets #1248
+ Add WACCM T4MA chemistry mechanism
+ Fix: Vertical indexing mismatch in rrtmgp/mcica_subcol_gen.F90 in high-top configuration #1261
+
+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: brian-eaton, cacraigucar, PeterHjortLauritzen
+
+List all files eliminated: N/A
+
+List all files added and what they do:
+A       bld/namelist_files/use_cases/waccm_ma_hist_cam7.xml
+A       bld/namelist_files/use_cases/waccm_sc_hist_cam7.xml
+ - build-namelist use case files for WACCM7(X) compsets
+
+A       src/chemistry/pp_waccm_t4ma_mam5/chem_mech.doc
+A       src/chemistry/pp_waccm_t4ma_mam5/chem_mech.in
+A       src/chemistry/pp_waccm_t4ma_mam5/chem_mods.F90
+A       src/chemistry/pp_waccm_t4ma_mam5/m_rxt_id.F90
+A       src/chemistry/pp_waccm_t4ma_mam5/m_spc_id.F90
+A       src/chemistry/pp_waccm_t4ma_mam5/mo_adjrxt.F90
+A       src/chemistry/pp_waccm_t4ma_mam5/mo_exp_sol.F90
+A       src/chemistry/pp_waccm_t4ma_mam5/mo_imp_sol.F90
+A       src/chemistry/pp_waccm_t4ma_mam5/mo_indprd.F90
+A       src/chemistry/pp_waccm_t4ma_mam5/mo_lin_matrix.F90
+A       src/chemistry/pp_waccm_t4ma_mam5/mo_lu_factor.F90
+A       src/chemistry/pp_waccm_t4ma_mam5/mo_lu_solve.F90
+A       src/chemistry/pp_waccm_t4ma_mam5/mo_nln_matrix.F90
+A       src/chemistry/pp_waccm_t4ma_mam5/mo_phtadj.F90
+A       src/chemistry/pp_waccm_t4ma_mam5/mo_prod_loss.F90
+A       src/chemistry/pp_waccm_t4ma_mam5/mo_rxt_rates_conv.F90
+A       src/chemistry/pp_waccm_t4ma_mam5/mo_setrxt.F90
+A       src/chemistry/pp_waccm_t4ma_mam5/mo_sim_dat.F90
+ - new WACCM T4MA chemistry mechanism
+
+List all existing files that have been modified, and describe the changes:
+
+M       bld/build-namelist
+ - namelist setting for
+   . T4MA chemistry
+   . HT model top
+
+M       bld/config_files/definition.xml
+ - expand model_top to include
+   . "ht" -- high-top waccm
+   . "xt" -- extended-top waccmx
+ - include waccmx_t4ma_mam5 chemistry mechanism
+
+M       bld/configure
+ - set default nlev according to model_top
+
+M       bld/namelist_files/namelist_defaults_cam.xml
+ - update igrf_geomag_coefs files to IGRF14
+ - default namelist settings for model_top ht and xt (se_* and gw)
+
+M       cime_config/config_component.xml
+M       cime_config/config_compsets.xml
+ - implement WACCM7(X) compsets
+
+M       cime_config/config_pes.xml
+ - default PE-layouts for  ACCM7(X) compsets on derecho
+
+M       cime_config/testdefs/testlist_cam.xml
+ - add regression test for WACCM7(X) compsets
+ - fix broken WACCMX AMIE test by using aqua-planet mode
+
+M       src/physics/rrtmgp/mcica_subcol_gen.F90
+ - fix indexing mismatch issue with higher top models
+
+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:
+
+derecho/nvhpc/aux_cam:
+
+izumi/nag/aux_cam:
+
+izumi/gnu/aux_cam:
+
+CAM tag used for the baseline comparison tests if different than previous
+tag:
+
+Summarize any changes to answers, i.e.,
+- what code configurations:
+- what platforms/compilers:
+- nature of change (roundoff; larger than roundoff but same climate; new
+  climate):
+
+If bitwise differences were observed, how did you show they were no worse
+than roundoff?
+
+If this tag changes climate describe the run(s) done to evaluate the new
+climate in enough detail that it(they) could be reproduced, i.e.,
+- source tag (all code used must be in the repository):
+- platform/compilers:
+- configure commandline:
+- build-namelist command (or complete namelist):
+- MSS location of output:
+
+MSS location of control simulations used to validate new climate:
+
+URL for AMWG diagnostics output used to validate new climate:
+
+===============================================================
+===============================================================
+
 Tag name: cam6_4_076
 Originator(s): eaton
 Date: 17 March 2025