Fig. 2: Hysteresis and reversibility of surface temperature.
From: Widespread irreversible changes in surface temperature and precipitation in response to CO2 forcing
a, The hysteresis map for surface temperature. The map shows the hysteresis area (unit: °C ppm) as colour and the closed-loop region as a hatched pattern. b, Zonal mean hysteresis area for the globe (black), ocean (blue) and land (orange). c, A trajectory of surface temperature anomaly during a CO2 ramp-up (orange) and ramp-down (blue) period for selected points. The panels show the Southern Ocean (70° S, 30° W), the eastern equatorial Pacific (0°, 120° W), East Asia (50° N, 120° E), the North Atlantic Ocean (60° N, 30° W), and the Arctic Ocean (80° N, 140° W). The geographical locations are marked as numbered dots in a. Additionally, the globally averaged trajectory is presented on the top left side of the panel.
