Fig. 3: Periodicity–variance spectrum of NH sea ice and perennial sea ice.
From: Northern Hemisphere sea ice variability in a transient CGCM simulation of the past 2.6 Ma
The periodicity–variance spectrum of sea ice is shown in colors (units show standardized variance) during the (a) post-MPT, (b) MPT, and (c) pre-MPT periods. Dots indicate significance at red noise with a 95% confidence interval. Purple lines at 70° N indicate the mean lowest latitudinal position of perennial sea ice. d–f Green lines show the periodicity–variance spectrum of perennial sea ice. Red line indicates red noise with a 95% confidence interval.
