NASA Logo

NTRS

NTRS - NASA Technical Reports Server

Back to Results
An introduction to wavelet analysis in oceanography and meteorology - With application to the dispersion of Yanai wavesWavelet analysis is a relatively new technique that is an important addition to standard signal analysis methods. Unlike Fourier analysis that yields an average amplitude and phase for each harmonic in a dataset, the wavelet transform produces an instantaneous estimate or local value for the amplitude and phase of each harmonic. This allows detailed study of nonstationary spatial or time-dependent signal characteristics. The wavelet transform is discussed, examples are given, and some methods for preprocessing data for wavelet analysis are compared. By studying the dispersion of Yanai waves in a reduced gravity equatorial model, the usefulness of the transform is demonstrated. The group velocity is measured directly over a finite range of wavenumbers by examining the time evolution of the transform. The results agree well with linear theory at higher wavenumber but the measured group velocity is reduced at lower wavenumbers, possibly due to interaction with the basin boundaries.
Document ID
19940035567
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Meyers, Steven D.
(NASA Headquarters Washington, DC United States)
Kelly, B. G.
(NASA Headquarters Washington, DC United States)
O'Brien, J. J.
(Florida State Univ. Tallahassee, United States)
Date Acquired
August 16, 2013
Publication Date
October 1, 1993
Publication Information
Publication: Monthly Weather Review
Volume: 121
Issue: 10
ISSN: 0027-0644
Subject Category
Meteorology And Climatology
Accession Number
94A12222
Distribution Limits
Public
Copyright
Other

Available Downloads

There are no available downloads for this record.
No Preview Available