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Article Dans Une Revue Geochemical Perspectives Letters Année : 2015

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

Résumé

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.
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Dates et versions

hal-01771250 , version 1 (19-04-2018)

Identifiants

Citer

A. Dosseto, N. Vigier, R Joannes-Boyau, I Moffat, T Singh, et al.. Rapid response of silicate weathering rates to climate change in the Himalaya. Geochemical Perspectives Letters, 2015, 1 (1), pp.10 - 19. ⟨10.7185/geochemlet.1502⟩. ⟨hal-01771250⟩
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