Method for assessing the amplitude modulation of the stationary planetary waves
This short-communication presents a new method for assessing the amplitude modulation of the stationary planetary waves (SPWs). The suggested procedure allows estimating the contribution of the amplitude modulated SPWs to the field of the zonally travelling planetary waves. The root of the method...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
| Published: |
Copernicus Publications
2009-02-01
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| Series: | Annales Geophysicae |
| Online Access: | https://www.ann-geophys.net/27/617/2009/angeo-27-617-2009.pdf |
| Summary: | This short-communication presents a new method for assessing the amplitude
modulation of the stationary planetary waves (SPWs). The suggested procedure
allows estimating the contribution of the amplitude modulated SPWs to the
field of the zonally travelling planetary waves. The root of the method
consists in calculating of a quantity that is analogous to 2-D Lomb-Scargle amplitude
spectrum and also the relative error of the approximation. The amplitude
"spectra" of the SPWs give information about the period(s) of modulation,
while the relative errors - define the coefficient(s) of modulation. The
suggested method is applied to the UKMO temperature data for the Arctic
winter of 2004–2005. |
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| ISSN: | 0992-7689 1432-0576 |