Chemical denudation in the Yellow River and its geomorphological implications

doi:10.1016/j.geomorph.2014.12.004

	Chemical denudation in the Yellow River and its geomorphological implications
	Ran, Lishan 1; Lu, X. X.1,2; Sun, Huiguo 3; Han, Jingtai 3; Yu, Ruihong 2
刊名	GEOMORPHOLOGY
	2015-02-15
卷号	231 页码:83-93
关键词	Chemical denudation Water geochemistry CO2 consumption Physical erosion Yellow River
ISSN号	0169-555X
DOI	10.1016/j.geomorph.2014.12.004
文献子类	Article
英文摘要	Chemical denudation plays an important role in regulating atmospheric CO2 balance and modulating global climate. With weekly collected water samples at three stations on the Yellow River mainstem from July 2011 to July 2012, we investigate its chemical denudation characteristics on the basis of water geochemistry and discuss the geomorphological implications. Because of limited atmospheric inputs into the Yellow River, chemical weathering is of first importance in affecting the chemical compositions of its water geochemistry. As a result of extensive carbonates within the watershed, carbonate dissolution is the major source of the dissolved solids, accounting for 28-33.7% of the total dissolved solids (TDS). In contrast, silicate weathering contributes only 9.9-10.9%. With a mean TDS concentration of 639 mg I-1, the TDS flux into the ocean is estimated at 16 Mt yr(-1), corresponding to a specific chemical denudation rate of 21.3 t km(-2) yr(-1). Comparative analysis with physical erosion suggests the dominance of physical erosion over chemical weathering in providing riverine loads. Rapid removal by physical erosion may have restrained the chemical denudation processes. Rock weathering consumes, on average, 23 Mt of atmospheric CO2 during the one-year-long sampling campaign, accounting for 0.22-0.31% of the global annual CO2 consumption through chemical weathering. Of the CO2 consumed, 74% is caused by carbonate weathering and 26% by silicate weathering, indicating the predominance of carbonate weathering in consuming atmospheric CO2 within the watershed. (C) 2014 Elsevier B.V. All rights reserved.
WOS关键词	ATMOSPHERIC CO2 CONSUMPTION ; SILICATE WEATHERING RATES ; ORGANIC-CARBON TRANSPORT ; ZEALAND SOUTHERN ALPS ; WORLD WATER CHEMISTRY ; QINGHAI-TIBET PLATEAU ; CLIMATIC CONTROLS ; DISSOLVED-LOAD ; LOESS PLATEAU ; BASIN RIVERS
WOS研究方向	Physical Geography ; Geology
语种	英语
出版者	ELSEVIER SCIENCE BV
WOS记录号	WOS:000348957100008
资助机构	National University of Singapore(MOE2011-T2-1-101) ; National University of Singapore(MOE2011-T2-1-101) ; National University of Singapore(MOE2011-T2-1-101) ; National University of Singapore(MOE2011-T2-1-101) ; National University of Singapore(MOE2011-T2-1-101) ; National University of Singapore(MOE2011-T2-1-101) ; National University of Singapore(MOE2011-T2-1-101) ; National University of Singapore(MOE2011-T2-1-101)
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/86974]
专题	中国科学院地质与地球物理研究所
通讯作者	Lu, X. X.
作者单位	1.Natl Univ Singapore, Dept Geog, Singapore 117570, Singapore 2.Inner Mongolia Univ, Coll Environm Resources, Hohhot 010021, Peoples R China 3.Chinese Acad Sci, Inst Geol & Geophys, Beijing 100029, Peoples R China
推荐引用方式 GB/T 7714	Ran, Lishan,Lu, X. X.,Sun, Huiguo,et al. Chemical denudation in the Yellow River and its geomorphological implications[J]. GEOMORPHOLOGY,2015,231:83-93.
APA	Ran, Lishan,Lu, X. X.,Sun, Huiguo,Han, Jingtai,&Yu, Ruihong.(2015).Chemical denudation in the Yellow River and its geomorphological implications.GEOMORPHOLOGY,231,83-93.
MLA	Ran, Lishan,et al."Chemical denudation in the Yellow River and its geomorphological implications".GEOMORPHOLOGY 231(2015):83-93.