Mesoscale Parallel Experiment Log

Experiment Name
Eta-32 with modified thermal conductivity through snow cover
Parallel Slot
ETAL
Control Slot
ETAV
Start date of parallel experiment
00Z 2002/01/23
End date of parallel experiment
00Z 2002/02/22
Environmental Modeling Center scientists
Mike Ek, Ken Mitchell, Eric Rogers
Abstract (including Motivation, Hypothesis and Method)
The Eta-32 parallel system is being used to test a modification to the thermal conductivity through snow and the inclusion of snow cover patchiness in the ground heat flux calculation.
FORECAST MODEL CHANGES
  • The change to the land-surface scheme (SFLX) in the operational mesoscale Eta model reflects a modification to the thermal conductivity through snow and the inclusion of snow cover patchiness in the ground heat flux calculation, where snowcover can be less than one if snow cover is less that some threshold snow depth (nominally about 12.5-40 cm depending on model surface type and snow density). As such, the ground heat flux is increased, especially under shallow snow cover conditions, resulting in more heat flux from below at night, partially offseting snow-surface nighttime radiative cooling, and subsequently reducing the cold bias in the 2-meter air temperature at night.
  • Experiment changes log
    Implementation changes list
    Product changes list
    Background links
    Evaluation of parallel results
    Daily forecast maps
    Daily forecast stats
    Verification of precipitation and against rawinsondes / surface data
    Conclusion

    IMPLEMENTED 12Z 2/26/2002

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    Page Last Modified: January 16, 2002