How temperature-dependent silicate weathering acts as Earth's geological thermostat

S. L. Brantley, Andrew Shaughnessy, Marina I. Lebedeva, Victor N. Balashov

Research output: Contribution to journalArticlepeer-review

22 Scopus citations

Abstract

Earth's climate may be stabilized over millennia by solubilization of atmospheric carbon dioxide (CO2) as minerals weather, but the temperature sensitivity of this thermostat is poorly understood. We discovered that the temperature dependence of weathering expressed as an activation energy increases from laboratory to watershed as transport, clay precipitation, disaggregation, and fracturing increasingly couple to dissolution. A simple upscaling to the global system indicates that the temperature dependence decreases to ~22 kilojoules per mole because (i) the lack of runoff limits weathering and retains base metal cations on half the land surface and (ii) other landscapes are regolith-shielded and show little weathering response to temperature. By comparing weathering from laboratory to globe, we reconcile some aspects of kinetic and thermodynamic controls on CO2 drawdown by natural or enhanced weathering.

Original languageEnglish (US)
Pages (from-to)382-389
Number of pages8
JournalScience
Volume379
Issue number6630
DOIs
StatePublished - Jan 27 2023

All Science Journal Classification (ASJC) codes

  • General

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