Fig. 4: Periodicity–variance spectrum of sea ice in the Atlantic and Pacific Ocean sectors.
From: Northern Hemisphere sea ice variability in a transient CGCM simulation of the past 2.6 Ma
The periodicity–variance spectrum of sea ice extent in the (a–c) Atlantic (35° N–90° N, 85° W–5° E) and (d–f) Pacific Ocean (35° N–90° N, 130° E–130° W) sectors are shown in black lines during the post-MPT, MPT, and pre-MPT periods. The periodicity–variance spectrum of Atlantic perennial sea ice is shown in blue lines, and the Pacific perennial sea ice is shown in green lines. Red and orange lines indicate red noise with a 95% confidence interval for the sea ice extent and perennial sea ice, respectively.
