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Abstract The patterns associated with the top-of-the-atmosphere radiative responseRto surface temperatureTare typically explored through two relationships: 1) the spatially varying radiative response to spatially varying changes in temperature (ΔRi/ΔTi) and 2) the spatially varying radiative response to global-mean changes in temperature (ΔRi/ΔT). Here, we explore the insights provided by an alternative parameter: the global-mean radiative response to changes in spatially varying temperature (ΔR/ΔTi). The pattern ΔR/ΔTiindicates regions where surface temperature covaries withRand thus provides a statistical analog to the causal response functions derived from atmospheric Green’s function experiments. The pattern can be transformed so that it can be globally averaged and thus indicates the local contribution to the global feedback parameter. The transformed version of ΔR/ΔTicorresponds to the pattern in surface temperature whose expansion coefficient time series explains the maximum fraction of the covariance betweenRandTi. It explains roughly the same fraction of internal variability inRas that explained by the Green’s function approach. We focus on the physical insights provided by ΔR/ΔTiwhen it is estimated from regression analyses of monthly mean observations. Consistent with the results of Green’s function experiments, the observational analyses indicate negative contributions to the global internal feedback parameter over the western Pacific and positive contributions over the southeastern tropical Pacific. Unlike the results of such experiments, the analyses indicate notable negative contributions to the global feedback parameter over land areas. When estimated from observations, temperature variability over the land areas accounts for ∼70% of the negative global internal feedback, whereas variability over the southeastern tropical Pacific reduces the global-mean negative internal feedback by ∼10%.more » « lessFree, publicly-accessible full text available August 15, 2026
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