Abrupt-4xCO2 (150y): POP pH solver instability — changed dt_count and PE layout mid-run; OK to analyze together?

C

CCl

ccl
New Member
Hi all,
I’m running a CESM2 CMIP-style abrupt-4xCO2 for 150 years. Around year ~42 the run became unstable due to a POP pH solver issue. Based on forum suggestions I fixed it by changing dt_count, but this slowed the run a lot, so starting from year 41 (restart) I also changed the PE layout to regain speed.
Is it acceptable to combine years 1–40 and 41–150 for analysis?
Thanks!
 
C

CCl

ccl
New Member
1768188865678.png
After the branch (year 40→41), my global-mean TS shows a small decrease / shift (see figure).
 
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