Skip to main content
placeholder image

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

Journal Article


Download full-text (Open Access)

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.

UOW Authors


  •   Dosseto, Anthony
  •   Vigier, Nathalie (external author)
  •   Joannes-Boyau, Renaud C. (external author)
  •   Moffat, Ian A. (external author)
  •   Singh, T (external author)
  •   Srivastava, Pradeep (external author)

Publication Date


  • 2015

Citation


  • Dosseto, A., Vigier, N., Joannes-Boyau, R., Moffat, I., Singh, T. & Srivastava, P. (2015). Rapid response of silicate weathering rates to climate change in the Himalaya. Geochemical Perspectives Letters, 1 (1), 10-19.

Scopus Eid


  • 2-s2.0-84956999732

Ro Full-text Url


  • http://ro.uow.edu.au/cgi/viewcontent.cgi?article=3974&context=smhpapers

Ro Metadata Url


  • http://ro.uow.edu.au/smhpapers/2952

Number Of Pages


  • 9

Start Page


  • 10

End Page


  • 19

Volume


  • 1

Issue


  • 1

Place Of Publication


  • Netherlands

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.

UOW Authors


  •   Dosseto, Anthony
  •   Vigier, Nathalie (external author)
  •   Joannes-Boyau, Renaud C. (external author)
  •   Moffat, Ian A. (external author)
  •   Singh, T (external author)
  •   Srivastava, Pradeep (external author)

Publication Date


  • 2015

Citation


  • Dosseto, A., Vigier, N., Joannes-Boyau, R., Moffat, I., Singh, T. & Srivastava, P. (2015). Rapid response of silicate weathering rates to climate change in the Himalaya. Geochemical Perspectives Letters, 1 (1), 10-19.

Scopus Eid


  • 2-s2.0-84956999732

Ro Full-text Url


  • http://ro.uow.edu.au/cgi/viewcontent.cgi?article=3974&context=smhpapers

Ro Metadata Url


  • http://ro.uow.edu.au/smhpapers/2952

Number Of Pages


  • 9

Start Page


  • 10

End Page


  • 19

Volume


  • 1

Issue


  • 1

Place Of Publication


  • Netherlands