Merge pull request ESCOMP#96 from gold2718/add_taper_fix

noresm_v6_cam6_3_123: Add taper fix

Summary: New version of CAM-Nor FV dycore with extended taper for AM fixer with supporting namelist changes
Contributors: tto061, gold2718
Reviewers: oyvindseland, tto061
Purpose of changes:  Add capability for extended taper of FV AM fixer (Issue ESCOMP#95) 
Github PR URL: NorESMhub#96
Changes made to build system: None
Changes made to the namelist: 
- fv_am_fix_taper: Added flag to taper the AM fixer
- fv_am_fix_tpr_h: Added height (pressure) at which to begin the taper
- fv_am_fix_tpr_w: Height (pressure) interval for fixer
Changes to the defaults for the boundary datasets: None
Substantial timing or memory changes: None
- Externals_CAM.cfg: New CAM-Nor-physics tag (containing code changes to implement AM fixer)
- bld/namelist_files/namelist_definition.xml: Added new namelist variables (see above)
Tested with aux_cam_noresm, all tests pass
Issues addressed by this PR:
closes NorESMhub#95

Externals_CAM.cfg

@@ -63,7 +63,7 @@ required = True
 
 [camnor_phys]
 protocol = git
-tag = camnor_noresm_v0.0.3
+tag = camnor_noresm_v0.0.4
 repo_url = https://github.com/NorESMhub/CAM-Nor-physics
 local_path = src/physics/camnor_phys
 required = True

bld/namelist_files/namelist_definition.xml

@@ -766,6 +766,28 @@ Flag to determine how to handle dpcoup warning messages
 Default: off
 </entry>
 
+<entry id="fv_am_fix_taper" type="logical"  category="dyn_fv"
+       group="dyn_fv_inparm" valid_values="" >
+Flag to taper the fixer (regardless of whether applied level by level or
+as a global constant) from full to nil (def. above 95hPa).  This further
+limits the artifical effect of the fixer in the stratosphere where the gw
+forcing can be very sensitive to its increments. This option is experimental.
+Default: .false.
+</entry>
+
+<entry id="fv_am_fix_tpr_h" type="real"  category="dyn_fv"
+       group="dyn_fv_inparm" valid_values="" >
+Height (pressure) to start tapering the fixer. This option is experimental.
+Default: 9500._r8
+</entry>
+
+<entry id="fv_am_fix_tpr_w" type="real"  category="dyn_fv"
+       group="dyn_fv_inparm" valid_values="" >
+Height (pressure) interval over which the fixer taper function drops to zero.
+This option is experimental.
+Default: 1000._r8
+</entry>
+
 <!-- MPI configuration for FV dycore -->
 
 <entry id="force_2d" type="integer"  category="dyn_fv"
@@ -4936,6 +4958,16 @@ neutral thermosphere, and off for no WACCM-X.
 Default: 'off'
 </entry>
 
+<!--==============================================-->
+<!-- Hydrostatic pressure work in mass adjustment -->
+<entry id="dme_energy_adjust" type="logical"  category="NorESM"
+       group="phys_ctl_nl" valid_values="" >
+Switch to use appropriate energy adjustment in dry-mass adjustment at the
+end of tphysac.
+Default: .false.
+</entry>
+<!--==============================================-->
+
 <entry id="oplus_adiff_limiter" type="real" category="waccmx"
        group="ionosphere_nl" valid_values="" >
 Limiter for ambipolar diffusion coefficient used in O+ transport in the