Climate sensitivity
; Climate state
; CMIP5
; Radiative forcings
; Radiative-convective equilibrium
; Surface temperatures
; Warm climates
; Warming climate
; Atmospheric radiation
; Atmospheric temperature
; Global warming
; Vapors
; Climate models
; climate feedback
; climate modeling
; equilibrium
; global warming
; radiative forcing
; radiative transfer
; surface temperature
; tropopause
; water vapor
英文摘要:
Equilibrium climate sensitivity (ECS) is a widely accepted measure of Earth's susceptibility to radiative forcing. While ECS is often assumed to be constant to a first order of approximation, recent studies suggested that ECS might depend on the climate state. Here it is shown that the latest generation of climate models consistently exhibits an increasing ECS in warmer climates due to a strengthening of the water-vapor feedback with increasing surface temperatures. The increasing ECS is replicated by a one-dimensional radiative-convective equilibrium model, which further shows that the enhanced water-vapor feedback follows from the rising of the tropopause in a warming climate. This mechanism is potentially important for understanding both warm climates of Earth's past and projections of future high-emission scenarios.
Max Planck Institute for Meteorology, Bundesstrasse 53, 20146 Hamburg, Germany
Recommended Citation:
Meraner K.,Mauritsen T.,Voigt A.. Robust increase in equilibrium climate sensitivity under global warming[J]. Geophysical Research Letters,2013-01-01,40(22).