Computation of climate sensitivity to upsurges in atmospheric CO₂ concentration
by Alberto Boretti
International Journal of Global Warming (IJGW), Vol. 31, No. 2, 2023

Abstract: The sensitivity of the climate to upsurges in atmospheric CO₂ concentration is highly variable, from 0.005357 to 0.016071°C/ppm in the literature. This work computes an updated value of the sensitivity parameter based on the best available results for the time series of global temperatures and atmospheric CO₂ concentrations up to present. The sensitivity parameter is thus assessed at 0.007243°C/ppm, which is in the lower range of values proposed so far. From the parabolic fitting of both time series, the further growth of temperature and atmospheric CO₂ concentration by 2,100 are estimated at about 1.81°C and 295 ppm. This gives a slightly smaller sensitivity parameter of 0.006136°C/ppm. The novelty of this work is the updated computation of the sensitivity factor, which is much less than what is thought, based on the best available data for temperature and atmospheric CO₂ time series.

Online publication date: Mon, 09-Oct-2023

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