A multimodel examination of climate extremes in an idealized geoengineering experiment

Compared to the preindustrial climate, changes in climate extremes under G1 are generally much smaller than under 4 × CO2 alone. However, it is also the case that extremes of temperature and precipitation in G1 differ significantly from those under preindustrial conditions.

Probability density functions of standardized anomalies of monthly surface temperature T and precipitation T in G1 exhibit an extension of the high-T tail over land, of the low-T tail over ocean, and a shift of T to drier conditions. Using daily model output, we analyzed the frequency of extreme events, such as the coldest night (TNn), warmest day (TXx), and maximum 5 day precipitation amount, and also duration indicators such as cold and warm spells and consecutive dry days.