Rapid response of silicate weathering rates to climate change in the Himalaya

Anthony Dosseto, N Vigier, Renaud Joannes-Boyau, Ian Moffat, Tejpal Singh, Pradeep Srivastava

    Research output: Contribution to journalArticle

    30 Citations (Scopus)

    Abstract

    Chemical weathering of continental rocks plays a central role in regulating the carbon cycle and the Earth's climate (Walker et al., 1981; Berner et al., 1983), accounting for nearly half the consumption of atmospheric carbon dioxide globally (Beaulieu et al., 2012). However, the role of climate variability on chemical weathering is still strongly debated. Here we focus on the Himalayan range and use the lithium isotopic composition of clays in fluvial terraces to show a tight coupling between climate change and chemical weathering over the past 40 ka. Between 25 and 10 ka ago, weathering rates decrease despite temperature increase and monsoon intensification. This suggests that at this timescale, temperature plays a secondary role compared to runoff and physical erosion, which inhibit chemical weathering by accelerating sediment transport and act as fundamental controls in determining the feedback between chemical weathering and atmospheric carbon dioxide.

    Original languageEnglish
    Pages (from-to)10-19
    Number of pages10
    JournalGeochemical Perspectives Letters
    Volume1
    Issue number1
    DOIs
    Publication statusPublished - 2015

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