Table 1

Description of simulations (Simulations include two that differ only by CO2 amount (1×CO2 and 2×CO2), and simulations for a world with twice the CO2 in which solar insolation is decreased at various levels globally, or north of 61° N, or north of 71° N. Simulations are designed to differ from other simulations in only one respect.)

simulationatmospheric CO2 concentration (ppm)global mean insolation reduction (%)region of insolation reductioninsolation reduction in engineered region (%)
1×CO22800
2×CO25600
Arctic61_0.375600.3761° N–90° N10
Arctic71_0.375600.3771° N–90° N25
Global_1.845601.84global1.84
Global_0.735600.73global0.73
Arctic61_1.845601.8461° N–90° N50
Arctic71_0.735600.7371° N–90° N50