A “simulation” of Mid‐Cretaceous climate

摘要: A series of general circulation model experiments utilizing GENESIS have been completed for the mid-Cretaceous based on geography, variable atmospheric carbon dioxide concentrations (2 to 6 times present-day concentrations), and poleward oceanic heat flux (.6 1.2 × 1015 W increased from present day). By combining all three major variables (CO2, flux), distribution temperatures can be achieved. In simulations, CO2 is required promote global warmth, prevent tropics overheating with higher levels CO2. Four provided best match data. The Cretaceous observations was achieved a globally averaged surface temperature increase 6.2°C, at lower end past estimates warmth. This value may better estimate warming. Finally, used provide “paleocalibration” warming expected doubling dioxide. appear 2.5 4.0°C sensitivity, in mid upper range sensitivity current climate models assess future change.