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Date of report: February 2023
Title: Topography file error 2022
Issue: Regional refined topography was in the incorrect location/orientation
Model tags affected: NCAR_Topo_2_0_1 files for regional refinement. An erroneous topography file was specified for use when creating variable resolution grids between April 2022 and Jan 2023. 
Model response: Gravity waves impacted, incorrect transport, chemistry fields displaced
Fix: Reprocess topography and re-run model simulations. If you created your own grid during that period please checkout the updated code at:  https://GitHub.com/NCAR/Topo and recreate your topography file for your grid and re-run any simulations. To check if your topography file has this error, plot ANGLL vs ANGLX.  In a "good" topo-file these variables should have large differences. In a "bad" file they will be very close everywhere.
More information: AMWG Github issue 213

Chemistry mechanism bug

Date of report: 2021
Title: MPAN+M chemistry bug
Issue: In the TS1 and TSMLT1 chemistry mechanisms (compsets FCnudged, FCHIST, FWHIST, etc.) the MPAN+M reaction is not calculated because the user reaction refers to a reaction not in the mechanism (tag_MCO3_NO2 instead of usr_MCO3_NO2).  This error does not exist in the TS2 chemical mechanisms.
Model tags affected: Not in versions CESM2.1 and prior. Found in version CESM2.2, May 2021. Fixed in version CAM6_3_019.
Model response: Missing chemistry.
Fix: Update chemical mechanism from:

[usr_MCO3_NO2] MCO3 + NO2 + M -> MPAN + M
to:
[tag_MCO3_NO2] MCO3 + NO2 + M -> MPAN + M. ; 9.7e-29, 5.6, 9.3e-12, 1.5, 0.6

More information:  CAM GitHub issue #364 
Contact Louisa Emmons with any questions.