气候变化领域集成服务门户(CCPortal): Mass changes in Arctic ice caps and glaciers: Implications of regionalizing elevation changes

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DOI	10.5194/tc-9-139-2015
	Mass changes in Arctic ice caps and glaciers: Implications of regionalizing elevation changes
	Nilsson J.; Sandberg Sørensen L.; Barletta V.R.; Forsberg R.
发表日期	2015
ISSN	19940416
卷号	9 期号:1
英文摘要	The mass balance of glaciers and ice caps is sensitive to changing climate conditions. The mass changes derived in this study are determined from elevation changes derived measured by the Ice, Cloud, and land Elevation Satellite (ICESat) for the time period 2003-2009. Four methods, based on interpolation and extrapolation, are used to regionalize these elevation changes to areas without satellite coverage. A constant density assumption is then applied to estimate the mass change by integrating over the entire glaciated region. The main purpose of this study is to investigate the sensitivity of the regional mass balance of Arctic ice caps and glaciers to different regionalization schemes. The sensitivity analysis is based on studying the spread of mass changes and their associated errors, and the suitability of the different regionalization techniques is assessed through cross-validation. The cross-validation results shows comparable accuracies for all regionalization methods, but the inferred mass change in individual regions, such as Svalbard and Iceland, can vary up to 4 Gt a'1, which exceeds the estimated errors by roughly 50% for these regions. This study further finds that this spread in mass balance is connected to the magnitude of the elevation change variability. This indicates that care should be taken when choosing a regionalization method, especially for areas which exhibit large variability in elevation change. © 2015 Author(s).
学科领域	cryosphere; elevation; glacier mass balance; ice cap; ICESat; satellite imagery; sensitivity analysis; Arctic; Iceland; Svalbard; Svalbard and Jan Mayen
语种	英语
scopus关键词	cryosphere; elevation; glacier mass balance; ice cap; ICESat; satellite imagery; sensitivity analysis; Arctic; Iceland; 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/119964
作者单位	Department of Geodynamics, DTU Space, Technical University of Denmark, Elektrovej 327, Lyngby, 2800, Denmark; Ohio State University, 275 Mendenhall Lab, 125 S. Oval Mall, Columbus, OH 43214, United States
推荐引用方式 GB/T 7714	Nilsson J.,Sandberg Sørensen L.,Barletta V.R.,et al. Mass changes in Arctic ice caps and glaciers: Implications of regionalizing elevation changes[J],2015,9(1).
APA	Nilsson J.,Sandberg Sørensen L.,Barletta V.R.,&Forsberg R..(2015).Mass changes in Arctic ice caps and glaciers: Implications of regionalizing elevation changes.Cryosphere,9(1).
MLA	Nilsson J.,et al."Mass changes in Arctic ice caps and glaciers: Implications of regionalizing elevation changes".Cryosphere 9.1(2015).