Fig. 4: Simulated climate changes resulting from minimum and maximum obliquity in NCAR CESM1.2.
From: Zonally asymmetric changes in the Antarctic Circumpolar Current strength over the past million years
Anomalies are presented by obliquity minimum minus obliquity maximum. a, Sea-level pressure anomalies (colour) and zonal wind anomalies (black vectors), showing positive Southern Annual Mode-like responses with low sea-level pressure at the South Pole and higher sea-level pressure in the mid-latitudes. b, Zonal wind strength at 850 hPa during austral winter in the Atlantic–Indian sector (red and orange) and Pacific sector (blue and cyan) during minimum and maximum obliquity (obl_min and obl_max), respectively. Vertical dashed lines mark the peaks of the jet stream. c, Integrated density anomalies. Basemaps in a and c based on simulation datasets from NCAR CESM50. SB, Southern boundary. These boundaries are defined from satellite altimetry and in situ observations10. d, ACC transport (42° S–58° S) anomalies across the Atlantic–Indian sector (0°–160° E) and Pacific sector (160° E–60° W) of the Southern Ocean. Panels a and c adapted from ref. 49 under a Creative Commons license CC BY 4.0.
