Fig. 2: Multidecadal variability of Antarctic SIE anomalies reconstructed during 1700–2000.
From: Antarctic sea ice multidecadal variability triggered by Southern Annular Mode and deep convection
a Time series of detrended Antarctic SIE anomalies (in million km2) reconstructed via the paleoclimate data assimilation in the past 300 years. Here DL2023 stands for the reconstruction data from Dalaiden et al. (2023)48. b Fourier power spectrum of the detrended Antarctic SIE anomalies. The power density is normalized by its variance (\({\sigma }^{2}\)). A dashed line corresponds to 95% confidence level of the normalized power density using a chi-squared test. c Wavelet power spectrum (color) of the Antarctic SIE anomalies. The power density is normalized by its variance (\({\sigma }^{2}\)). Black contour encloses regions with 90% confidence level of the normalized power density using a chi-squared test.
