Figure 6: Diagrams showing the continuous wavelet timefrequency spectrum for the Svalbard winter (DJF) and summer (JJA) temperature series 1912–2010. The time (AD) and frequency (yr^{−1}) of cyclic variations embedded in the temperature data shown along the horizontal axes. Frequencies higher than 0.25 yr^{−1} are not shown, corresponding to showing only periods longer than 4 yr. The vertical axis (and colour scale) shows the magnitude of the Continuous Wavelet Spectrum at a given time and frequency. The magnitude is calculated as sqrt(Re*Re + Im*Im), where Re is the real component of a given segment’s FFT at a given frequency and Im is the imaginary component. Usually the magnitude is 34 times the corresponding amplitude. The dotted line indicates the extent of the cone of influence. Identical colour scales have been used for both diagrams to emphasise the wintersummer difference as to signal magnitude. The winter data shows the edge effect of zero padding, see, for example, the 5.2 and 9.2 yr oscillations. 
