气候变化领域集成服务门户(CCPortal): Sustained wood burial in the Bengal Fan over the last 19 My

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DOI	10.1073/pnas.1913714116
	Sustained wood burial in the Bengal Fan over the last 19 My
	Lee H.; Galy V.; Feng X.; Ponton C.; Galy A.; France-Lanord C.; Feakins S.J.
发表日期	2019
ISSN	0027-8424
起始页码	22518
结束页码	22525
卷号	116 期号:45
英文摘要	The Ganges–Brahmaputra (G-B) River system transports over a billion tons of sediment every year from the Himalayan Mountains to the Bay of Bengal and has built the world’s largest active sedimentary deposit, the Bengal Fan. High sedimentation rates drive exceptional organic matter preservation that represents a long-term sink for atmospheric CO2. While much attention has been paid to organic-rich fine sediments, coarse sediments have generally been overlooked as a locus of organic carbon (OC) burial. However, International Ocean Discovery Program Expedition 354 recently discovered abundant woody debris (millimeter- to centimeter-sized fragments) preserved within the coarse sediment layers of turbidite beds recovered from 6 marine drill sites along a transect across the Bengal Fan (∼8°N, ∼3,700-m water depth) with recovery spanning 19 My. Analysis of bulk wood and lignin finds mostly lowland origins of wood delivered episodically. In the last 5 My, export included C4 plants, implying that coarse woody, lowland export continued after C4 grassland expansion, albeit in reduced amounts. Substantial export of coarse woody debris in the last 1 My included one wood-rich deposit (∼0.05 Ma) that encompassed coniferous wood transported from the headwaters. In coarse layers, we found on average 0.16 weight % OC, which is half the typical biospheric OC content of sediments exported by the modern G-B Rivers. Wood burial estimates are hampered by poor drilling recovery of sands. However, high-magnitude, low-frequency wood export events are shown to be a key mechanism for C burial in turbidites. © 2019 National Academy of Sciences. All rights reserved.
英文关键词	Bengal Fan; Carbon cycle; Himalaya; Lignin; Wood
语种	英语
scopus关键词	lignin; organic carbon; Article; Bay of Bengal; carbon cycle; carbon sequestration; chemical composition; concentration (parameter); conifer; geochemical analysis; grassland; isotope analysis; organic matter production; precipitation; priority journal; seasonal variation; sediment transport; wood; wood debris
来源期刊	Proceedings of the National Academy of Sciences of the United States of America
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/159033
作者单位	Lee, H., Department of Earth Sciences, University of Southern California, Los Angeles, CA 90089, United States; Galy, V., Department of Marine Chemistry and Geochemistry, Woods Hole Oceanographic Institution, Woods Hole, MA 02543, United States; Feng, X., State Key Laboratory of Vegetation and Environmental Change, Institute of Botany, Chinese Academy of Sciences, Beijing, 100093, China; Ponton, C., Department of Earth Sciences, University of Southern California, Los Angeles, CA 90089, United States, Department of Geology, Western Washington University, Bellingham, WA 98225, United States; Galy, A., Centre de Recherches Pétrographiques et Géochimiques, CNRS, Université de Lorraine, Vandoeuvre-lès-Nancy, 54506, France; France-Lanord, C., Centre de Recherches Pétrographiques et Géochimiques, CNRS, Université de Lorraine, Vandoeuvre-lès-Nancy, 54506, France; Feakins, S.J., Department of Earth Sciences, University of Southern California, Los Angeles, CA 90089, United States
推荐引用方式 GB/T 7714	Lee H.,Galy V.,Feng X.,et al. Sustained wood burial in the Bengal Fan over the last 19 My[J],2019,116(45).
APA	Lee H..,Galy V..,Feng X..,Ponton C..,Galy A..,...&Feakins S.J..(2019).Sustained wood burial in the Bengal Fan over the last 19 My.Proceedings of the National Academy of Sciences of the United States of America,116(45).
MLA	Lee H.,et al."Sustained wood burial in the Bengal Fan over the last 19 My".Proceedings of the National Academy of Sciences of the United States of America 116.45(2019).