干旱区生态环境知识资源中心(Arid): Rates of rockwall slope erosion in the upper Bhagirathi catchment, Garhwal Himalaya

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DOI	10.1002/esp.4720
	Rates of rockwall slope erosion in the upper Bhagirathi catchment, Garhwal Himalaya
	Orr, Elizabeth N.1,2; Owen, Lewis A.1,3; Saha, Sourav 1,4; Caffee, Marc W.5,6
通讯作者	Orr, Elizabeth N.
来源期刊	EARTH SURFACE PROCESSES AND LANDFORMS
ISSN	0197-9337
EISSN	1096-9837
出版年	2019
卷号	44 期号:15 页码:3108-3127
英文摘要	Rockwall slope erosion is defined for the upper Bhagirathi catchment using cosmogenic Beryllium-10 (Be-10) concentrations in sediment from medial moraines on Gangotri glacier. Beryllium-10 concentrations range from 1.1 +/- 0.2 to 2.7 +/- 0.3 x 10(4) at/g SiO2, yielding rockwall slope erosion rates from 2.4 +/- 0.4 to 6.9 +/- 1.9 mm/a. Slope erosion rates are likely to have varied over space and time and responded to shifts in climate, geomorphic and/or tectonic regime throughout the late Quaternary. Geomorphic and sedimentological analyses confirm that the moraines are predominately composed of rockfall and avalanche debris mobilized from steep relief rockwall slopes via periglacial weathering processes. The glacial rockwall slope erosion affects sediment flux and storage of snow and ice at the catchment head on diurnal to millennial timescales, and more broadly influences catchment configuration and relief, glacier dynamics and microclimates. The slope erosion rates exceed the averaged catchment-wide and exhumation rates of Bhagirathi and the Garhwal region on geomorphic timescales (10(3)-10(5) years), supporting the view that erosion at the headwaters can outpace the wider catchment. The Be-10 concentrations of medial moraine sediment for the upper Bhagirathi catchment and the catchments of Chhota Shigri in Lahul, northern India and Baltoro glacier in Central Karakoram, Pakistan show a tentative relationship between Be-10 concentration and precipitation. As such there is more rapid glacial rockwall slope erosion in the monsoon-influenced Lesser and Greater Himalaya compared to the semi-arid interior of the orogen. Rockwall slope erosion in the three study areas, and more broadly across the northwest Himalaya is likely governed by individual catchment dynamics that vary across space and time. (c) 2019 John Wiley & Sons, Ltd.
英文关键词	supraglacial processes sediment flux glacier climate cosmogenic isotopes
类型	Article
语种	英语
国家	USA ; Germany
开放获取类型	Green Submitted, Green Published, hybrid
收录类别	SCI-E
WOS记录号	WOS:000497295500001
WOS关键词	DEBRIS-COVERED GLACIERS ; EQUILIBRIUM-LINE ALTITUDES ; CHHOTA SHIGRI GLACIER ; SITU-PRODUCED BE-10 ; GANGOTRI GLACIER ; QUATERNARY GLACIATION ; LANDSCAPE EVOLUTION ; SUSPENDED SEDIMENT ; MASS-BALANCE ; COSMOGENIC NUCLIDES
WOS类目	Geography, Physical ; Geosciences, Multidisciplinary
WOS研究方向	Physical Geography ; Geology
EI主题词	2019-11-19
来源机构	University of California, Los Angeles
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/310925
作者单位	1.Univ Cincinnati, Dept Geol, Cincinnati, OH 45221 USA; 2.GFZ German Res Ctr Geosci, D-14473 Potsdam, Germany; 3.North Carolina State Univ, Dept Marine Earth & Atmospher Sci, Raleigh, NC 27695 USA; 4.Univ Calif Los Angeles, Dept Earth Planetary & Space Sci, Los Angeles, CA 90095 USA; 5.Purdue Univ, Dept Phys, W Lafayette, IN 47907 USA; 6.Purdue Univ, Dept Earth Atmospher & Planetary Sci, W Lafayette, IN 47907 USA
推荐引用方式 GB/T 7714	Orr, Elizabeth N.,Owen, Lewis A.,Saha, Sourav,et al. Rates of rockwall slope erosion in the upper Bhagirathi catchment, Garhwal Himalaya[J]. University of California, Los Angeles,2019,44(15):3108-3127.
APA	Orr, Elizabeth N.,Owen, Lewis A.,Saha, Sourav,&Caffee, Marc W..(2019).Rates of rockwall slope erosion in the upper Bhagirathi catchment, Garhwal Himalaya.EARTH SURFACE PROCESSES AND LANDFORMS,44(15),3108-3127.
MLA	Orr, Elizabeth N.,et al."Rates of rockwall slope erosion in the upper Bhagirathi catchment, Garhwal Himalaya".EARTH SURFACE PROCESSES AND LANDFORMS 44.15(2019):3108-3127.