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Climate of the Past An interactive open-access journal of the European Geosciences Union
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Preprints
https://doi.org/10.5194/cp-2020-65
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/cp-2020-65
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

Submitted as: research article 20 May 2020

Submitted as: research article | 20 May 2020

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This preprint is currently under review for the journal CP.

Long-Term Global Ground Heat Flux and Continental Heat Storage from Geothermal Data

Francisco José Cuesta-Valero1,2, Almudena García-García1,2, Hugo Beltrami1,3, J. Fidel González-Rouco4, and Elena García-Bustamante5 Francisco José Cuesta-Valero et al.
  • 1Climate & Atmospheric Sciences Institute, St. Francis Xavier University, Antigonish, NS, Canada
  • 2Environmental Sciences Program, Memorial University of Newfoundland, St. John’s, NL, Canada
  • 3Department of Earth Sciences, St. Francis Xavier University, Antigonish, Nova Scotia, Canada
  • 4Universidad Complutense de Madrid, 28040 Madrid, Spain
  • 5Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas (CIEMAT), 28040 Madrid, Spain

Abstract. Energy exchanges among climate subsystems are of critical importance to determine the climate sensitivity of the Earth's system to greenhouse gases, to quantify the magnitude and evolution of the Earth's energy imbalance, and to project the evolution of future climate. Thus, ascertaining the magnitude and change of the Earth's energy partition within climate subsystems has become urgent in recent years. Here, we provide new global estimates of changes in ground surface temperature, ground surface heat flux and continental heat storage derived from geothermal data using an expanded database and new techniques. Results reveal markedly higher changes in ground heat flux and heat storage within the continental subsurface than previously reported, with land temperature changes of 1 K and continental heat gains of around 12 ZJ during the last part of the 20th century relative to preindustrial times. Half of the heat gain by the continental subsurface since 1960 have occurred in the last twenty years.

Francisco José Cuesta-Valero et al.

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Francisco José Cuesta-Valero et al.

Francisco José Cuesta-Valero et al.

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Short summary
We provide new global estimates of changes in surface temperature, surface heat flux and continental heat storage since preindustrial times from geothermal data. Our analysis includes new measurements and a more comprehensive description of uncertainties than previous studies. Results show higher continental heat storage than previously reported, with global land mean temperature changes of 1 K and subsurface heat gains of 12 ZJ during the last half of the 20th century.
We provide new global estimates of changes in surface temperature, surface heat flux and...
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