DOI: 10.1038/NGEO3046
论文题名: Substantial export of suspended sediment to the global oceans from glacial erosion in Greenland
作者: Overeem I. ; Hudson B.D. ; Syvitski J.P.M. ; Mikkelsen A.B. ; Hasholt B. ; Van Den Broeke M.R. ; Noel B.P.Y. ; Morlighem M.
刊名: Nature Geoscience
ISSN: 17520894
出版年: 2017
卷: 10, 期: 11 起始页码: 859
结束页码: 863
语种: 英语
Scopus关键词: algal bloom
; carbon sequestration
; coast
; fjord
; glacial erosion
; global ocean
; meltwater
; phytoplankton
; runoff
; satellite imagery
; sediment transport
; sheet flow
; suspended load
; suspended sediment
; Arctic
; Greenland
; Greenland
; Greenland Ice Sheet
英文摘要: Limited measurements along Greenland's remote coastline hamper quantification of the sediment and associated nutrients draining the Greenland ice sheet, despite the potential influence of river-transported suspended sediment on phytoplankton blooms and carbon sequestration. Here we calibrate satellite imagery to estimate suspended sediment concentration for 160 proglacial rivers across Greenland. Combining these suspended sediment reconstructions with numerical calculations of meltwater runoff, we quantify the amount and spatial pattern of sediment export from the ice sheet. We find that, although runoff from Greenland represents only 1.1% of the Earth's freshwater flux, the Greenland ice sheet produces approximately 8% of the modern fluvial export of suspended sediment to the global ocean. Sediment loads are highly variable between rivers, consistent with observed differences in ice dynamics and thus with control by glacial erosion. Rivers that originate from deeply incised, fast-moving glacial tongues form distinct sediment-export hotspots: just 15% of Greenland's rivers transport 80% of the total sediment load of the ice sheet. We conclude that future acceleration of melt and ice sheet flow may increase sediment delivery from Greenland to its fjords and the nearby ocean. © 2017 Macmillan Publishers Limited, part of Springer Nature. All rights reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/105670
Appears in Collections: 气候减缓与适应 科学计划与规划
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作者单位: Community Surface Dynamics Modeling System, INSTAAR, University of Colorado, Boulder, CO, United States; Polar Science Center, Applied Physics Laboratory, University of Washington, Seattle, WA, United States; Department of Geoscience and Natural Resource Management, University of Copenhagen, Copenhagen, Denmark; IMAU, Utrecht University, Utrecht, Netherlands; Department of Earth System Science, University of California, Irvine, CA, United States
Recommended Citation:
Overeem I.,Hudson B.D.,Syvitski J.P.M.,et al. Substantial export of suspended sediment to the global oceans from glacial erosion in Greenland[J]. Nature Geoscience,2017-01-01,10(11)