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| Titel |
New significance test methods for Fourier analysis of geophysical time series |
| VerfasserIn |
Z. Zhang, J. Moore |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1023-5809
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| Digitales Dokument |
URL |
| Erschienen |
In: Nonlinear Processes in Geophysics ; 18, no. 5 ; Nr. 18, no. 5 (2011-09-27), S.643-652 |
| Datensatznummer |
250013972
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| Publikation (Nr.) |
 copernicus.org/npg-18-643-2011.pdf |
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| Zusammenfassung |
| When one applies the discrete Fourier transform to analyze
finite-length time series, discontinuities at the data boundaries
will distort its Fourier power spectrum. In this paper, based on a
rigid statistics framework, we present a new significance test
method which can extract the intrinsic feature of a geophysical time
series very well. We show the difference in significance level
compared with traditional Fourier tests by analyzing the Arctic
Oscillation (AO) and the Nino3.4 time series. In the AO, we find
significant peaks at about 2.8, 4.3, and 5.7 yr periods and in
Nino3.4 at about 12 yr period in tests against red noise. These
peaks are not significant in traditional tests. |
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