Geoscience Reference
In-Depth Information
a
b
Fig. 5.17
Wavelet power spectrum for the synthetic data series contained in
series_3.txt
.
h e plot clearly shows signii cant periodicities at frequencies of 0.01, 0.025, and 0.05 kyr-1
corresponding to the 100, 40, and 20 kyr cycles. h e 100 kyr cycle is present throughout the
entire time series, whereas the 40 kyr cycle only appears at around 450 kyrs before present.
h e 20 kyr cycle is relatively weak but is probably present throughout the entire time series.
h e wavelet power spectrum has been calculated using
a
the continuous 1D wavelet transform
cwt
and
b
the continuous wavelet transform using FFT algorithm
cwtft
.
