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A wavelet analysis of Plio‐Pleistocene climate indicators: A new view of periodicity evolution
Author(s) -
Bolton Edward W.,
Maasch Kirk A.,
Lilly Jonathan M.
Publication year - 1995
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/95gl02799
Subject(s) - morlet wavelet , wavelet , normalization (sociology) , geology , fourier analysis , fourier transform , frequency analysis , amplitude , climatology , wavelet transform , mathematics , physics , discrete wavelet transform , statistics , computer science , mathematical analysis , optics , artificial intelligence , sociology , anthropology
Wavelet analysis offers an alternative to Fourier based time‐series analysis, and is particularly useful when the amplitudes and periods of dominant cycles are time dependent. We analyze climatic records derived from oxygen isotopic ratios of marine sediment cores with modified Morlet wavelets. We use a normalization of the Morlet wavelets which allows direct correspondence with Fourier analysis. This provides a direct view of the oscillations at various frequencies, and illustrates the nature of the time‐dependence of the dominant cycles.