DOI: 10.5194/tc-9-1895-2015
Scopus记录号: 2-s2.0-84942570048
论文题名: CryoSat-2 delivers monthly and inter-annual surface elevation change for Arctic ice caps
作者: Gray L ; , Burgess D ; , Copland L ; , Demuth M ; N ; , Dunse T ; , Langley K ; , Schuler T ; V
刊名: Cryosphere
ISSN: 19940416
出版年: 2015
卷: 9, 期: 5 起始页码: 1895
结束页码: 1913
语种: 英语
英文关键词: altimeter
; arctic environment
; backscatter
; CryoSat
; elevation
; ice cap
; radar
; snow accumulation
; timescale
; uncertainty analysis
; Arctic
; Austfonna
; Baffin Island
; Canada
; Devon Ice Cap
; Nordaustlandet
; Nunavut
; Svalbard
; Svalbard
; Svalbard and Jan Mayen
英文摘要: We show that the CryoSat-2 radar altimeter can provide useful estimates of surface elevation change on a variety of Arctic ice caps, on both monthly and yearly timescales. Changing conditions, however, can lead to a varying bias between the elevation estimated from the radar altimeter and the physical surface due to changes in the ratio of subsurface to surface backscatter. Under melting conditions the radar returns are predominantly from the surface so that if surface melt is extensive across the ice cap estimates of summer elevation loss can be made with the frequent coverage provided by CryoSat-2. For example, the average summer elevation decreases on the Barnes Ice Cap, Baffin Island, Canada were 2.05 ± 0.36 m (2011), 2.55 ± 0.32 m (2012), 1.38 ± 0.40 m (2013) and 1.44 ± 0.37 m (2014), losses which were not balanced by the winter snow accumulation. As winter-to-winter conditions were similar, the net elevation losses were 1.0 ± 0.20 m (winter 2010/11 to winter 2011/12), 1.39 ± 0.20 m (2011/12 to 2012/13) and 0.36 ± 0.20 m (2012/13 to 2013/14); for a total surface elevation loss of 2.75 ± 0.20 m over this 3-year period. In contrast, the uncertainty in height change from Devon Ice Cap, Canada, and Austfonna, Svalbard, can be up to twice as large because of the presence of firn and the possibility of a varying bias between the true surface and the detected elevation due to changing year-to-year conditions. Nevertheless, the surface elevation change estimates from CryoSat for both ice caps are consistent with field and meteorological measurements. © 2015 Author(s). Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/75241
Appears in Collections: 影响、适应和脆弱性 气候变化与战略
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作者单位: Department of Geography, University of Ottawa, Ottawa, Canada; Natural Resources Canada, Ottawa, Canada; Department of Geosciences, University of Oslo, Oslo, Norway
Recommended Citation:
Gray L,, Burgess D,, Copland L,et al. CryoSat-2 delivers monthly and inter-annual surface elevation change for Arctic ice caps[J]. Cryosphere,2015-01-01,9(5)