Category Archives: Sensitivity & feedbacks

Gregory et al 2019: Unsound claims about bias in climate feedback and climate sensitivity estimation

By Nic Lewis

The recently published open-access paper “How accurately can the climate sensitivity to CO2 be estimated from historical climate change?” by Gregory et al.[i] makes a number of assertions, many uncontentious but others in my view unjustified, misleading or definitely incorrect.

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What’s the worst case? Climate sensitivity

by Judith Curry

Are values of equilibrium climate sensitivity > 4.5 C plausible?

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Why climate predictions are so difficult

by Judith Curry

An insightful interview with Bjorn Stevens.

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Climate sensitivity calculator app

by Alberto Zaragoza Comendador

How sensitive is the Earth’s climate to greenhouse gases? Speaking about carbon dioxide in particular, how much would air temperatures increase if we doubled atmospheric concentrations of said gas?

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Reconstructing a dataset of observed global temperatures 1950-2016 from human and natural influences

by Frank Bosse

A demonstration that multidecadal variation since 1950 leads to overestimation of the Transient Climate Response (TCR).

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Climate sensitivity to cumulative carbon emissions

By Nic Lewis

An observational estimate of transient (multidecadal) warming relative to cumulative CO2 emissions is little over half that per IPCC AR5 projections.

AR5 claims that CO2-caused warming would be undiminished for 1000 years after emissions cease, but observations indicate that it would halve. Continue reading

Warming patterns are unlikely to explain low historical estimates of climate sensitivity

By Nic Lewis

A critique of of a new paper by Andrews  et al., Accounting for changing temperature patterns increases historical estimates of climate sensitivity.

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