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update MYNN PBL code to WRF 4.6 #3

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update MYNN PBL code to WRF 4.6 #3

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@weiwangncar weiwangncar commented Oct 30, 2024

This PR updates MYNN code to WRF 4.6 based on WRF PR-2037. It corrects the following issues:

  1. overly diminished TKE in stable PBL - always dropping to the lower limit
  2. negative mass flux area fractions found (rarely) with activation criteria change from flt to fltv.
  3. edmf diagnostics erroneously included rho.

@mgduda mgduda requested a review from ldfowler58 June 16, 2025 20:40
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