Adaptive filtering and maximum entropy spectra with application to changes in atmospheric angular momentum

Details Adaptive filtering and maximum entropy spectra with application to changes in atmospheric angular momentum Adaptive filtering and maximum entropy spectra with application to changes in atmospheric angular momentum

Dec 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991jgr....9622659p&link_type=abstract

Journal of Geophysical Research, Volume 96, Issue D12, p. 22659-22671

Physics

51

Meteorology And Atmospheric Dynamics: General Circulation, Meteorology And Atmospheric Dynamics: Instruments And Techniques, Oceanography: Physical: Air/Sea Interactions, Planetology: Solid Surface Planets: Orbital And Rotational Dynamics

Scientific paper

The spectral resolution and statistical significance of a harmonic analysis obtained by low-order maximum entropy methods (MEM) can be improved by subjecting the data to an adaptive filter. This adaptive filter consists of projecting the data onto the leading temporal empirical orthogonal functions obtained from singular spectrum analysis (SSA). The combined SSA-MEM method is applied both to a synthetic time series and a time series of atmospheric angular momentum (AAM) data. The procedure is very effective when the background noise is white and less so when the background noise is red. The latter case obtains in the AAM data. Nevertheless, we detect reliable evidence for intraseasonal and interannual oscillations in AAM. The interannual periods include a quasi-biennial one and low-frequency one of 5 years, both related to the El Niño/Southern Oscillation. In the intraseaonal band, separate oscillations of about 48..5 and 51 days are ascertained.

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