气候变化领域集成服务门户(CCPortal): CryoSat-2 delivers monthly and inter-annual surface elevation change for Arctic ice caps

CCPortal

DOI	10.5194/tc-9-1895-2015
	CryoSat-2 delivers monthly and inter-annual surface elevation change for Arctic ice caps
	Gray L.; Burgess D.; Copland L.; Demuth M.N.; Dunse T.; Langley K.; Schuler T.V.
发表日期	2015
ISSN	19940416
卷号	9 期号:5
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).
学科领域	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
语种	英语
scopus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
来源期刊	Cryosphere
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/119810
作者单位	Department of Geography, University of Ottawa, Ottawa, K1N6N5, Canada; Natural Resources Canada, Ottawa, Canada; Department of Geosciences, University of Oslo, Oslo, Norway
推荐引用方式 GB/T 7714	Gray L.,Burgess D.,Copland L.,et al. CryoSat-2 delivers monthly and inter-annual surface elevation change for Arctic ice caps[J],2015,9(5).
APA	Gray L..,Burgess D..,Copland L..,Demuth M.N..,Dunse T..,...&Schuler T.V..(2015).CryoSat-2 delivers monthly and inter-annual surface elevation change for Arctic ice caps.Cryosphere,9(5).
MLA	Gray L.,et al."CryoSat-2 delivers monthly and inter-annual surface elevation change for Arctic ice caps".Cryosphere 9.5(2015).