Experimental "Fourier-Ray" Mountain Wave Forecasts
Jun Ma: Computational Physics, Inc., Springfield, VA
Stephen Eckermann: Code 7646, Naval Research Laboratory, Washington, DC
   During PAVE, Code 7646 at NRL is issuing a series of tests forecasts using our entirely new Fourier-ray method to assess its suitability (longer term) as a next-generation dynamical core for the Mountain Wave Forecast Model (MWFM).  For more information and background, consult the references listed below.
   The forecasts, provided for nominal New England and Greenland geographical domains, are being  issued here sporadically as purely experimental products. Our goal here is to compare the output from early versions of the Fourier-ray code during PAVE with more operational forecast products provided by the MWFM and 3DLOM. While mission scientists are welcome to peruse these forecasts, please note that all the forecasts on this page are 100% experimental, and as such should not be used as a basis for any kind of mission planning.

REFERENCES:
Broutman, D., J. W. Rottman and S. D. Eckermann, A hybrid method for analyzing wave propagation from a localized source, with application to mountain waves, Q. J. R. Meteorol. Soc., 127, 129-146, 2001.
Broutman, D., J. W. Rottman and S. D. Eckermann, Maslov's method for stationary hydrostatic mountain waves, Q. J. R. Meteorol. Soc., 128, 1159-1172, 2002.
Broutman, D., J. W. Rottman and S. D. Eckermann, A simplified Fourier method for nonhydrostatic mountain waves, J. Atmos. Sci., 60, 2686–2696, 2003.
Broutman, D., J. W. Rottman and S. D. Eckermann, Ray methods for internal waves in the atmosphere and ocean, Ann. Rev. Fluid Mech., 36, 233-253, 2004.

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Latest Test Fourier-Ray Forecasts
 Initialized 9_February_2005 at 12:00Z

NEW ENGLAND

Fourier-Ray Runs

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 0/12 Hour 24/36 Hour 48/60 Hour 72/84 Hour

GREENLAND

Fourier-Ray Runs

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 0/12 Hour 24/36 Hour 48/60 Hour 72/84 Hour

NORTHERN CANADA

Fourier-Ray Runs

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 0/12 Hour 24/36 Hour 48/60 Hour 72/84 Hour

Comparison MWFM-2 Forecasts

 

 0/6/12/18 Hour 24/30/36/42 Hour 48/54/60/66 Hour 72/78/84/90 Hour

MWFM-2 100 hPa Temperature Amplitudes using NOGAPS

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MWFM-2 200-250 hPa Turbulence using NOGAPS

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ECMWF IFS Prognostic Divergence Fields

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