Changeset 4146 for trunk/LMDZ.GENERIC/changelog.txt

Timestamp:

Mar 19, 2026, 2:35:46 PM (13 days ago)

Author:

gmilcareck

Message:

Thermodynamics update on LMDZ.GENERIC

File:

• trunk/LMDZ.GENERIC/changelog.txt (modified) (1 diff)

trunk/LMDZ.GENERIC/changelog.txt

@@ -2216 +2216 @@
 == 17/03/2026 == GM
 The nlines were not reset to 0 when reading tracer profiles during the newstart.
+
+== 19/03/2026 == GM
+***THERMODYNAMICS UPDATE ON LMDZ.GENERIC ***
+- The specific heat capacity, the specific gas constant and the R/Cp factor 
+  are now calculated in the new thermo_mod module.
+- Calculations of the potential temperature and the Exner function are now performed 
+  in the thermodynamics subroutine. This routine is called in physiq_mod whenever 
+  the temperature is updated after a subroutine is called. 
+  PLEASE NOTE: for future updates to LMDZ_GENERIC, if you wish to add a new subroutine 
+  that modifies the temperature or pressure in `physiq_mod`, you must call this 
+  subroutine to update `theta` and `exner` (see examples on physiq_mod), 
+  otherwise, the thermodynamics will be incorrect.
+- IMPORTANT: The constants cpp and mugaz are now called cppd_ref and mugaz_ref. 
+  You must therefore update your callphys.def. The cpp_mugaz_mode option is still 
+  valid, where mode 0 reads the cpp from the dynamics, mode 1 reads cppd_ref and 
+  mugaz_ref from callphys.def, and mode 2 calculates cppd_ref and mugaz_ref itself 
+  using the calc_cpp_mugaz routine.
+- For the moment, only the ideal single-gas option (thermo_uni_ideal) is available 
+  (i.e. the current case). It is set by default in the model with the thermo_phy flag.
+  You do not need to change or add anything to your .def files. 
+  The ideal gas mixture option will be added at a later date.
+- If the `generic_condensation` option is enabled, you must now add 
+  the constant `cppv_ref`, which represents the specific heat capacity of 
+  the pure condensable gas you have chosen.
+- Normally, this commit will not change your previous simulations, but, 
+  a difference of around 1K may occur in some configurations because theta was 
+  not well updated before for example.
+ === RESUME ===
+- If you add a new subroutine on physiq_mod that changes the temperature or pressure, 
+  call thermodynamics after that to update potential temperature and exner function.
+- cpp becomes cppd_ref in callphys.def
+- mugaz becomes mugaz_ref in callphys.def
+- NEW -> add cppv_ref if generic_condensation=.true.
+This update changes a lot of things, then some problems can occur. 
+Some fixes will be added as the model is tested in various configurations.
+