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| Titel |
Using empirical mode decomposition to correlate paleoclimatic time-series |
| VerfasserIn |
J. Solé, A. Turiel, J. E. Llebot |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1561-8633
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| Digitales Dokument |
URL |
| Erschienen |
In: Natural Hazards and Earth System Science ; 7, no. 2 ; Nr. 7, no. 2 (2007-04-17), S.299-307 |
| Datensatznummer |
250004454
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| Publikation (Nr.) |
 copernicus.org/nhess-7-299-2007.pdf |
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| Zusammenfassung |
| Determination of the timing and duration of paleoclimatic events is a
challenging task. Classical techniques for time-series analysis rely too
strongly on having a constant sampling rate, which poorly adapts to
the uneven time recording of paleoclimatic variables; new, more flexible
methods issued from Non-Linear Physics are hence required. In this paper, we
have used Huang's Empirical Mode Decomposition (EMD) for
the analysis of paleoclimatic series. We have studied three
different time series of temperature proxies, characterizing oscillation
patterns by using EMD. To measure the degree of temporal
correlation of two variables,
we have developed a method that relates
couples of modes from different series by calculating the instantaneous phase
differences among the associated modes.
We observed that when two modes exhibited a constant phase
difference, their frequencies were nearly equal to that of Milankovich cycles.
Our results show that
EMD is a good methodology not only for synchronization of different records
but also for determination of the different local frequencies in each time
series. Some of the obtained modes may be interpreted as the result of global
forcing mechanisms. |
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