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In current tests of GEOSgcm v11 with ifx 2025.2, Debug runs were crashing in dyn_core (in fvdycore) on a line concerning the use of q_con.

Running in a graphical debugger found that q_con was full of NaNs. Tracing the code, it was found that q_con was never initialized.

GEOSgcm v12 Debug did run because the line that v11 failed on was removed by @wmputman.

So this PR initializes q_con to tiny_number. My tests show that GEOSgcm v11 with ifort is zero-diff both with Release and Debug flags.

@mathomp4 mathomp4 self-assigned this Sep 24, 2025
@mathomp4 mathomp4 requested a review from a team as a code owner September 24, 2025 15:35
@mathomp4 mathomp4 added the 0 diff The changes in this pull request have verified to be zero-diff with the target branch. label Sep 24, 2025
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