Mesoscale Parallel Experiment Log

Experiment Name
Eta-32 with reduced aerodynamic resistance and redeuced canopy resistance to transpiration
Parallel Slot
ETAL
Control Slot
ETAV
Start date of parallel experiment
12Z 2002/10/08
End date of parallel experiment
00Z 2002/10/30
Environmental Modeling Center scientists
Mike Ek, Ken Mitchell, Geoff Manikin, Eric Rogers
Abstract (including Motivation, Hypothesis and Method)
The Eta-32 parallel system is being used to test changes to the model land-surface scheme to reduce warm 2-m temperature biases
FORECAST MODEL CHANGES
  • Reduced parameter CZIL reduced from 0.2 to 0.07. This change will reduce aerodyamnic resistance (i.e. surface turbulent exchange coefficients are too low during mid-day)
  • Reduced canopy resistance to transpiration; the vapor pressure (relative humidity) stress term therein is too strong and acts in a too heavy handed fashion to close the canopy leaf stomata too agressively during mid-day transpiration. Hence the latent heat flux is modestly too low over non-sparse green vegetation regions (eastern half of U.S. from late spring, thru summer, thru early Fall), even when we have good soil moisture.
  • Experiment changes log
    Background links
    Evaluation of parallel results
    Daily forecast maps
    Daily forecast stats
    Verification of precipitation and against rawinsondes / surface data
    Conclusion

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    Page Last Modified: January 16, 2002