摘要：The transient response of global-mean precipitation to an increase in atmospheric carbon dioxide levels
of 1% yr − 1 is investigated in 13 fully coupled atmosphere–ocean general circulation models
(AOGCMs) and compared to a period of stabilization. During the period
of stabilization, when carbon dioxide levels are held constant at twice their
unperturbed level and the climate left to warm, precipitation increases at a rate of ~ 2.4% per unit of global-mean surface-air-temperature change in the AOGCMs. However, when
carbon dioxide levels are increasing, precipitation increases at a smaller rate of ~ 1.5% per unit of global-mean surface-air-temperature change. This difference can be understood
by decomposing the precipitation response into an increase from the response to the global
surface-temperature increase (and the climate feedbacks it induces), and a fast atmospheric
response to the carbon dioxide radiative forcing that acts to decrease precipitation.
According to the multi-model mean, stabilizing atmospheric levels of carbon dioxide would
lead to a greater rate of precipitation change per unit of global surface-temperature change.
