Enhancements of Himalayan and Tibetan Erosion and the Produced Organic Carbon Burial in Distal Tropical Marginal Seas During the Quaternary Glacial Periods: An Integration of Sedimentary Records - Archive ouverte HAL Access content directly
Journal Articles Journal of Geophysical Research: Earth Surface Year : 2021

Enhancements of Himalayan and Tibetan Erosion and the Produced Organic Carbon Burial in Distal Tropical Marginal Seas During the Quaternary Glacial Periods: An Integration of Sedimentary Records

, , (1) , , , , , , ,
1
Zhaokai Xu
  • Function : Author
Shiming Wan
  • Function : Author
Peter D. Clift
  • Function : Author
Fengming Chang
  • Function : Author
Tiegang Li
  • Function : Author
Hongjin Chen
  • Function : Author
Mingjiang Cai
  • Function : Author
Zhaojie Yu
  • Function : Author
Dhongil Lim
  • Function : Author

Abstract

The Himalayan and Tibetan highlands (mountains), with high rates of physical erosion, are extreme settings for earth surface processes, generating one of the largest recent terrigenous detritus and organic carbon discharges to the ocean. However, their significance with respect to the global carbon and climate cycles during the Quaternary is still unclear, especially in quantitative terms. Here, we present comprehensive records of continental erosion and weathering, terrestrial supply, marine productivity, and organic carbon burial in the distal Arabian Sea, Bay of Bengal, and southern South China Sea since ∼700 ka over orbital timescales. These records exhibit periodicities corresponding to sea level and Indian summer monsoon intensity changes. During glacial periods, the enhanced highland surface erosion and activation of deep sea channels significantly increased inputs of terrigenous detritus, nutrients, and organic carbon into the Arabian Sea and Bay of Bengal, whereas strengthened continental shelf surface weathering and organic matter preservation occurred in the South China Sea. Conclusively, our integrative proxies in the study area demonstrate, for the first time, pronounced glacial burial pulses of organic carbon (∼1.12 × 1012 mol/yr), dominantly originating from the highland surface erosion and marine productivity. Together with the increased silicate weathering on the exposed tropical continental shelves and in the tropical volcanic arcs, the enhanced burial flux of organic carbon in the tropical marginal seas, therefore, highlights the large contributions that tropical regions can make within the glacial interglacial carbon inventory of the ocean and atmosphere and thus cause significant negative feedback on the global climate.
Fichier principal
Vignette du fichier
JGR Earth Surface - 2021 - Xu - Enhancements of Himalayan and Tibetan Erosion and the Produced Organic Carbon Burial in.pdf (1.57 Mo) Télécharger le fichier
Origin : Publisher files allowed on an open archive

Dates and versions

insu-03745272 , version 1 (04-08-2022)

Licence

Copyright

Identifiers

Cite

Zhaokai Xu, Shiming Wan, Christophe Colin, Peter D. Clift, Fengming Chang, et al.. Enhancements of Himalayan and Tibetan Erosion and the Produced Organic Carbon Burial in Distal Tropical Marginal Seas During the Quaternary Glacial Periods: An Integration of Sedimentary Records. Journal of Geophysical Research: Earth Surface, 2021, 126, ⟨10.1029/2020JF005828⟩. ⟨insu-03745272⟩
4 View
17 Download

Altmetric

Share

Gmail Facebook Twitter LinkedIn More