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Climate Science Glossary
Return to glossary listTransient climate response
Transient climate response (TCR)
The TCR is defined as the immediate change in global average surface temperature as a result of doubling the atmospheric CO2 concentration over a period of 70 years, at a rate 1% per year (compounded), measured by taking the average global temperature over a 20-year period centered at year 70, i.e., 60 – 80 years after the increase starts.
TCR represents the immediate warming effect of carbon dioxide, while the more commonly-cited ECS (equilibrium climate sensitivity) measures the long-term warming effect.
All IPCC definitions taken from Climate Change 2007: The Physical Science Basis. Working Group I Contribution to the Fourth Assessment Report of the Intergovernmental Panel on Climate Change, Annex I, Glossary, pp. 941-954. Cambridge University Press.
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