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Committed warming and its implications for climate change
Author(s) -
Wetherald Richard T.,
Stouffer Ronald J.,
Dixon Keith W.
Publication year - 2001
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/2000gl011786
Subject(s) - radiative forcing , environmental science , forcing (mathematics) , climatology , climate change , greenhouse gas , global warming , atmospheric sciences , climate sensitivity , climate commitment , climate model , transient climate simulation , atmosphere (unit) , radiative transfer , cloud forcing , greenhouse effect , lag , meteorology , effects of global warming , geology , geography , physics , computer network , oceanography , quantum mechanics , computer science
Time lags between changes in radiative forcing and the resulting simulated climate responses are investigated in a set of transient climate change experiments. Both surface air temperature (SAT) and soil moisture responses are examined. Results suggest that if the radiative forcing is held fixed at today's levels, the global mean SAT will rise an additional 1.0K before equilibrating. This unrealized warming commitment is larger than the 0.6K warming observed since 1900. The coupled atmosphere‐ocean GCM's transient SAT response for the year 2000 is estimated to be similar to its equilibration response to 1980 radiative forcings—a lag of ∼20 years. Both the time lag and the warming commitment are projected to increase in the future, and depend on the model‧s climate sensitivity, oceanic heat uptake, and the forcing scenario. These results imply that much of the warming due to current greenhouse gas levels is yet to be realized.