Stuck in Chemistry Dictionary (Group 11) despite MCHEM=0 and Group 12 headers.

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blanca rios

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Dec 23, 2025, 1:52:52 PM12/23/25
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Hi everyone, I'm experiencing a persistent error in CALPUFF v7.3.2. Even though I have set MCHEM = 0 in Input Group 2, the model seems to be stuck in the Chemistry Dictionary (Group 11).

When the model reaches Group 12, it fails with: Variable not found in variable dictionary: Variable: SYTDEP.

The Variable Dictionary shown in the error log still lists chemical variables (MOZ, BCKO3, NOX, etc.) instead of switching to Group 12 parameters. I have already verified that:

  1. MCHEM = 0 is correctly set in Group 2.

  2. Every preceding group is closed with a clean !END!.

  3. There are no hidden characters or spaces before the ! delimiters.

Has anyone encountered this 'dictionary leak' before or knows how to force the closure of Group 11?


Blanca

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