full hydrometeor building and clearing where it's cold at the surface #58
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…ace temperature is less than 5 deg C.
daviddowellNOAA
requested review from
christinaholtNOAA,
christopherwharrop-noaa,
chunhuazhou,
guoqing-noaa and
hu5970
as code owners
hu5970
approved these changes
Dec 6, 2023
chunhuazhou
approved these changes
Dec 6, 2023
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DESCRIPTION OF CHANGES:
RRFSv1 currently underpredicts snowfall in the first hour of the forecast and thus underpredicts accumulated snow in the hourly-cycled system. The proposed change addresses this specific problem by turning on hydrometeor building for columns where the surface temperature is less than 5 deg C. The new code for hydrometeor building, applied when "l_precip_clear_only" is .true., is based on previously existing code.
TESTS CONDUCTED:
Tests of the two-way coupled CONUS RRFS produced favorable results -- increased snowfall, more consistent with observations -- for a February 2022 test period. Results are summarized in slides 68-82:
https://docs.google.com/presentation/d/1Yu1ALkNwveP4vSeLFB5VNH1WoUOROAXBOBQzGjdEmqI/edit?pli=1#slide=id.g2a1fddb0476_0_17
The change will also be tested for the July 2022 retro period, to confirm no significant impact in the warm season.
DEPENDENCIES:
None
DOCUMENTATION:
ISSUE (optional):
CONTRIBUTORS (optional):
David Dowell and Chunhua Zhou