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

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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 ( IF 3.9 ) Pub Date : 2021-02-13 , DOI: 10.1029/2020jf005828
Zhaokai Xu _{1,

2,

3,

4} , Shiming Wan _{1,

2,

4} , Christophe Colin ₅ , Peter D. Clift ₆ , Fengming Chang _{1,

2,

3} , Tiegang Li _{2,

7} , Hongjin Chen _{1,

8} , Mingjiang Cai _{1,

8} , Zhaojie Yu _{1,

2,

3} , Dhongil Lim ₉

Affiliation

CAS Key Laboratory of Marine Geology and Environment Institute of Oceanology Chinese Academy of Sciences Qingdao266071 China
Laboratory for Marine Geology Pilot National Laboratory for Marine Science and Technology (Qingdao) Qingdao266061 China
Center for Ocean Mega‐Science Chinese Academy of Sciences Qingdao266071 China
CAS Center for Excellence in Quaternary Science and Global Change Xi'an710061 China
Laboratoire Geosciences Paris‐Sud (GEOPS) CNRS‐Université de Paris‐Sud Université Paris‐Saclay UMR 814891405Orsay Cedex France
Department of Geology and Geophysics Louisiana State University Baton Rouge Louisiana70803 USA
Key Laboratory of Marine Sedimentology and Environmental Geology First Institute of Oceanography Ministry of Natural Resources Qingdao266061 China
University of Chinese Academy of Sciences Beijing100049 China
South Sea Research Institute Korea Institute of Ocean Science & Technology Geoje53201 Republic of Korea

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.

更新日期：2021-03-15

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