DOI: 10.1016/j.jag.2013.08.005
Scopus记录号: 2-s2.0-84897831959
论文题名: MODIS-derived albedo changes of Vatnajökull (Iceland) due to tephradeposition from the 2004 Grímsvötn eruption
作者: Möller R ; , Möller M ; , Björnsson H ; , Gudmundsson S ; , Pálsson F ; , Oddsson B ; , Kukla P ; A ; , Schneider C
刊名: International Journal of Applied Earth Observation and Geoinformation
ISSN: 15698432
出版年: 2014
卷: 26, 期: 1 起始页码: 256
结束页码: 269
语种: 英语
英文关键词: Glacier-surface albedo
; Ice-volcano interactions
; Iceland
; Remote sensing
; Subglacial eruption
; Tephra fallout
Scopus关键词: albedo
; explosive volcanism
; glacier dynamics
; ice cap
; ice core
; MODIS
; remote sensing
; satellite data
; satellite imagery
; spatial variation
; subglacial deposit
; tephra
; volcanic eruption
; Grimsvotn
; Iceland
; Vatnajokull
英文摘要: Occasionally, the surface albedo of glaciers may be abruptly altered by deposition of light-absorbingaerosols, which consequently has a sustained impact on their energy- and mass balance. Volcanic erup-tions may spread tephra deposits over regional-scale glacierized areas. In November 2004, an explosive,phreatomagmatic eruption of the subglacial Grímsvötn volcano, located in the centre of the Icelandic icecap Vatnajökull, produced ash fall covering an area of ~1280 km2 in the northwestern part of the ice cap.This event affected the surface albedo of the glacier over several years after the eruption. We use MODISsurface-albedo data and an ash-dispersal dataset obtained from in situ measurements on the ice cap todevelop a novel, empirically based modelling approach to describe the albedo decrease across the glaciersurface caused by the deposited tephra. We present analyses of the temporal and spatial variability ofthe albedo pattern over the post-eruption period from November 2004 to December 2008. The tephra-induced albedo changes were largest and most widely distributed over the glacier surface during thesummer season 2005. The observed albedo decrease reached 0.35 when compared to modelled, undis-turbed conditions. In the low-lying ablation area, where strong surface melting takes place, the tephrainfluence on albedo diminished with time and completely faded out within four years after the eruption.In contrast, at the rim of the Grímsvötn caldera surrounding the eruption site the tephra influences onalbedo considerably increased with time. Throughout the rest of the high-lying accumulation area, theinfluences were scattered in both space and time. © 2013 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/79646
Appears in Collections: 气候变化事实与影响
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作者单位: Department of Geography, RWTH Aachen University, Wüllnerstraße 5b, 52062 Aachen, Germany; Institute of Geology and Palaeontology, Energy and Mineral Resources Group, RWTH Aachen University, Wüllnerstraße 2, 52062 Aachen, Germany; Institute of Earth Sciences, University of Iceland, Sturlugata 7, IS-101 Reykjavik, Iceland
Recommended Citation:
Möller R,, Möller M,, Björnsson H,et al. MODIS-derived albedo changes of Vatnajökull (Iceland) due to tephradeposition from the 2004 Grímsvötn eruption[J]. International Journal of Applied Earth Observation and Geoinformation,2014-01-01,26(1)