MPAS-Dev/MPAS-Model: MPAS Version 8.3.1

Published June 18, 2025 | Version v8.3.1

Software Open

1. NSF National Center for Atmospheric Research
2. @Google
3. Los Alamos National Laboratory
4. LANL
5. National Center for Atmospheric Research
6. NSF NCAR
7. Los Alamos National Lab
8. United States Naval Research Lab / University Corporation for Atmospheric Research
9. OU
10. @NCAR

This bugfix release corrects two issues in the MPAS-Atmosphere model:

Fix a bug in the vertical interpolation of humidity for LBCs when first-guess levels are given in top-to-bottom order. Incorrect logic in the init_atm_case_lbc routine previously assumed that first-guess levels would be given in bottom-to-top order when attempting to vertically extrapolate to model levels below the lowest first-guess level, resulting in a copy of the vertically interpolated relative humidity at level k+1 to level k if levels were given in top-to-bottom order. This bug resulted in an unreasonably low water vapor mixing ratio field (lbc_qv) in LBC files. (PR #1335)

NB: This bug is present in most older releases of MPAS, and it should be possible to cherry-pick the fix onto any branch or release based on MPAS v7.0 or later.
Fix an issue with .F90 files in the src/core_atmosphere/physics/physics_mmm/ directory not being re-compiled by updating the MMM-physics external tag to acquire a new Makefile.mpas file for MMM-physics. With the updated tag, compiling the atmosphere core, then making changes to any of the .F90 files in src/core_atmosphere/physics/physics_mmm/, then running make again (without first cleaning) leads to the modified .F90 files being correctly re-compiled. (PR #1337)

Files

Name	Size	Download all
MPAS-Dev/MPAS-Model-v8.3.1.zip md5:63c9fd61fa0a1d619ce1d061b9773f47	11.6 MB	Preview Download

Is supplement to: Software: https://github.com/MPAS-Dev/MPAS-Model/tree/v8.3.1 (URL)