Fig. 4
From: Millennium time-scale experiments on climate-carbon cycle with doubled CO2 concentration
Definitions of quantities for evaluating temperature and carbon (C) in 1pctCO2 and FULL2 × CO2 experiments, illustrated in the context of global surface air temperature change (ΔT)–cumulative anthropogenic C emission (CE): transient climate response (TCR); transient C emission (TCE); quasi-equilibrium climate sensitivity (qECS); quasi-equilibrium C emission (qECE); unrealized warming (ΔTUNR); unrealized C uptake (ΔCUNR); additional C uptake (ΔCADD); transient climate response to cumulative C emission (TCRE); quasi-equilibrium climate response to cumulative C emission (qECRE); and the ratio of unrealized warming to unrealized C uptake (RUNR). Note that TCRE is usually defined as the ratio of ΔT to CE when CE reaches 1000 PgC, but we evaluate it here when the CO2 concentration in the 1pctCO2 experiment reaches 2 × CO2 level