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A study of the extended-range forecasting problem blockingWavenumber frequency spectral analysis of a 90 day winter (Jan. 15 - April 14) wind field simulated by a climate experiment of the GLAS atmospheric circulation model is made using the space time Fourier analysis which is modified with Tukey's numerical spectral analysis. Computations are also made to examine how the model wave disturbances in the wavenumber frequency domain are maintained by nonlinear interactions. Results are compared with observation. It is found that equatorial easterlies do not show up in this climate experiment at 200 mb. The zonal kinetic energy and momentum transport of stationary waves are too small in the model's Northern Hemisphere. The wavenumber and frequency spectra of the model are generally in good agreement with observation. However, some distinct features of the model's spectra are revealed. The wavenumber spectra of kinetic energy show that the eastward moving waves of low wavenumbers have stronger zonal motion while the eastward moving waves of intermediate wavenumbers have larger meridional motion compared with observation. Furthermore, the eastward moving waves show a band of large spectral value in the medium frequency regime.
Document ID
19810014127
Acquisition Source
Legacy CDMS
Document Type
Technical Memorandum (TM)
Authors
Chen, T. C. (Iowa State Univ. Greenbelt, MD, United States)
Marshall, H. G. (Iowa State Univ.)
Shukla, J. (NASA Goddard Space Flight Center)
Date Acquired
September 4, 2013
Publication Date
March 1, 1981
Subject Category
Meteorology And Climatology
Report/Patent Number
NASA-TM-82343
Accession Number
81N22660
Funding Number(s)
CONTRACT_GRANT: NSG-5339
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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