DOI: 10.1016/j.quascirev.2016.01.025
Scopus记录号: 2-s2.0-84957052176
论文题名: Characteristics of recessional moraines at a temperate glacier in SE Iceland: Insights into patterns, rates and drivers of glacier retreat
作者: Chandler B.M.P. ; Evans D.J.A. ; Roberts D.H.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2016
卷: 135 起始页码: 171
结束页码: 205
语种: 英语
英文关键词: Glacier-climate interactions
; Ice-marginal retreat
; Iceland
; Recessional moraines
; Skálafellsjökull
Scopus关键词: Atmospheric pressure
; Digital storage
; Ice
; Oceanography
; Remote sensing
; Submarine geophysics
; Surface properties
; Surface waters
; Air temperature changes
; Climate variability
; Icelandic glaciers
; Icelands
; North Atlantic oscillations
; Recessional moraines
; Sea surface temperature (SST)
; Temperate glaciers
; Atmospheric temperature
; air temperature
; climate variation
; geometry
; geomorphology
; glacier retreat
; ice margin
; moraine
; North Atlantic Oscillation
; remote sensing
; sea surface temperature
; timescale
; Atlantic Ocean
; Atlantic Ocean (North)
; Iceland
英文摘要: Icelandic glaciers are sensitive to climate variability on short-term timescales owing to their North Atlantic maritime setting, and have been undergoing ice-marginal retreat since the mid-1990s. Recent patterns, rates and drivers of ice-frontal retreat at Skálafellsjökull, SE Iceland, are examined using small-scale recessional moraines as a geomorphological proxy. These small-scale recessional moraines exhibit distinctive sawtooth planform geometries, and are constructed by a range of genetic processes associated with minor ice-margin re-advance, including (i) combined push/squeeze mechanisms, (ii) bulldozing of pre-existing proglacial material, and (iii) submarginal freeze-on. Remote-sensing investigations and lichenometric dating highlight sequences of annually-formed recessional moraines on the northern and central parts of the foreland. Conversely, moraines are forming on a sub-annual timescale at the southeastern Skálafellsjökull margin. Using annual moraine spacing as a proxy for annual ice-margin retreat rates (IMRRs), we demonstrate that prominent periods of glacier retreat at Skálafellsjökull are coincident with those at other Icelandic outlet glaciers, as well as those identified at Greenlandic outlet glaciers. Analysis of IMRRs and climate data suggests summer air temperature, sea surface temperature and the North Atlantic Oscillation have an influence on IMRRs at Skálafellsjökull, with the glacier appearing to be most sensitive to summer air temperature. On the basis of further climate data analyses, we hypothesise that sea surface temperature may drive air temperature changes in the North Atlantic region, which in turn forces IMRRs. The increase in sea surface temperature over recent decades may link to atmospheric-driven variations in North Atlantic subpolar gyre dynamics. © 2016 Elsevier Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/59674
Appears in Collections: 过去全球变化的重建
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作者单位: Department of Geography, Durham University, Durham, United Kingdom
Recommended Citation:
Chandler B.M.P.,Evans D.J.A.,Roberts D.H.. Characteristics of recessional moraines at a temperate glacier in SE Iceland: Insights into patterns, rates and drivers of glacier retreat[J]. Quaternary Science Reviews,2016-01-01,135