Presentation on theme: "1 Use and Abuse of MM5 Chris Davis NCAR (MMM/RAP) Acknowledgements: Fei Chen, Kevin Manning, Simon Low-Nam, Jimy Dudhia, Jim Bresch, Wei Wang Presented."— Presentation transcript:
1 Use and Abuse of MM5 Chris Davis NCAR (MMM/RAP) Acknowledgements: Fei Chen, Kevin Manning, Simon Low-Nam, Jimy Dudhia, Jim Bresch, Wei Wang Presented at COMAP Symposium 99-1 Thursday, 20 May 1999
2 The MM5 modeling system flow chart * * from MM5 tutorial
3 Schematic representation of the vertical structure of the model. The example is for 15 layers. Dashed land solid lines denote half- and full-sigma levels, respectively.* * from MM5 tutorial
4 Example of a nesting configuration. The shading shows three different levels of nesting.* * from MM5 tutorial
11 Diurnal cycle: Comparison of 2-meter temperature for MM5 with Slab surface model, MM5 with new Land Surface Model (LSM), and observations from FIFE.
12 Diurnal cycle: Comparison of various surface quantities for MM5 with Slab surface model, MM5 with new Land Surface Model (LSM), and observations from FIFE. Incoming Solar Latent Heat Flux Surface RadiationSensible Heat Flux
13 q (g/kg) Mixing ratio at lowest model level compared to FIFE observations.
14 Profiles of potential temperature at selected times: comparison of MM5 with FIFE observations. 1200 Z1530 Z 1830 Z 2330 Z
15 Comparison of MM5 forecasts with RAOB data over the western U.S. from WISP’94.
16 Comparison of MM5 forecasts with RAOB data over the CONUS from WISP’94.
17 Distribution of the Scottish haar NOAA-8 1448 GMT 27 APRIL 1984 NOAA-7 0836 GMT 27 APRIL 1984
18 MM5 forecasts of the Scottish haar. 0800 UTC1600 UTC
20 4-domain configuration of MM5 for simulations over complex terrain of western Utah. Timeline of forecast cycle shown at bottom.
21 10-hour MM5 forecast on Domain 3 (3.3 km) of near-surface winds and potential temperature valid 2200 UTC 9 September, 1997.
22 4-hour MM5 forecast on Domain 4 (1.1 km) of near-surface winds and potential temperature valid 2200 UTC 9 September 1997.
23 Analysis of surface streamlines from Utah mesonet data on Domain 4 (1.1 km) for 0000 UTC 10 September 1997.
24 Mean absolute errors for 24-hour lagged persistence forecasts of surface meridional wind component. Mean absolute errors for MM5 forecasts of surface meridional wind component. Difference between persistence and MM5 forecasts. Blue bar indicates differences that are statistically significant at >95% confidence level.
25 Time-averaged MM5 24-hour forecasts and observations of surface temperature ( C) and wind (long barb = 1 m/s) valid at 1200 UTC for November-December 1997.