Using Satellite Observations to Constrain Parameterizations of Gravity Wave Effects for Global Model

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Using Satellite Observations to Constrain
Parameterizations of Gravity Wave Effects for
Global Models
Alexander and Barnet, 2006 accepted JAS
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September 17, 2004 Granule 183
4th order fitting effectively limits horizontal
wavelengths lt 500 km
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Mountain Wave Study Select All Granules
intersecting -56ltlatlt-36, -76ltlonlt-56 Month of
September 2003
40 AIRS Granule locations
High point at each latitude
Ridge definition for this study.
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• The short waves with horizontal wavelengths 100
  km have the largest amplitudes!
• (Reverse result from a red Fourier spectrum.)

NUMBER OF PIXELS
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• The strongest wave events occur at 180o.
• (-gt longest vertical wavelength when wave
  propagates upstream)
• The weak events that occur far from 180o are
  likely stronger events with short vertical
  wavelengths that are more highly attenuated.

NUMBER OF PIXELS
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4d radar precipitation
Example process study for improving GCM
gravity wave source parameterization
AIRS Observation and Model Comparison
AIRS
Model
Model domain
Input to mesoscale model
Verify with observations
Modeled wave fields
2d parameterized spectra
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Param. improve- ment
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2d Wave Spectrum
Wave analysis
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PDF of Patagonian mountain waves