A capacitor‐discharge mechanism to explain the timing of orogeny‐related global glaciations

Joshi, Manoj ORCID: https://orcid.org/0000-0002-2948-2811, Mills, Benjamin J. W. and Johnson, Martin (2019) A capacitor‐discharge mechanism to explain the timing of orogeny‐related global glaciations. Geophysical Research Letters, 46 (14). pp. 8347-8354. ISSN 0094-8276

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Over geological timescales, mountain building or orogenesis is associated with increased weathering, the drawdown of atmospheric CO2, and global cooling. However, a multimillion‐year delay appears to exist between peaks in low‐latitude mountain uplift and the maximum extent of Phanerozoic glaciation, implying a more complex causal relationship between the two. Here we show that global silicate weathering can be modulated by orogeny in three distinct phases. High, young mountain belts experience preferential precipitation and the highest erosion. As mountains are denuded, precipitation decreases, but runoff temperature rises, sharply increasing chemical weathering potential and CO2 drawdown. In the final phase, erosion and weathering are throttled by flatter topography. We conclude that orogeny acts as a capacitor in the climate system, granting the potential for intense transient CO2 drawdown when mountain ranges are denuded; the mechanism suggests such a scenario potentially happening 10‐50 million years in the future.

Item Type: Article
Uncontrolled Keywords: sdg 13 - climate action ,/dk/atira/pure/sustainabledevelopmentgoals/climate_action
Faculty \ School: Faculty of Science > School of Environmental Sciences
UEA Research Groups: Faculty of Science > Research Groups > Climatic Research Unit
Faculty of Science > Research Groups > Centre for Ocean and Atmospheric Sciences
University of East Anglia Schools > Faculty of Science > Tyndall Centre for Climate Change Research
Faculty of Science > Research Centres > Tyndall Centre for Climate Change Research
Depositing User: LivePure Connector
Date Deposited: 16 Jul 2019 07:49
Last Modified: 14 Jun 2023 13:51
URI: https://ueaeprints.uea.ac.uk/id/eprint/71755
DOI: 10.1029/2019GL083368

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