DOI: 10.5194/tc-9-139-2015
Scopus记录号: 2-s2.0-84921719465
论文题名: Mass changes in Arctic ice caps and glaciers: Implications of regionalizing elevation changes
作者: Nilsson J ; , Sandberg Sørensen L ; , Barletta V ; R ; , Forsberg R
刊名: Cryosphere
ISSN: 19940416
出版年: 2015
卷: 9, 期: 1 起始页码: 139
结束页码: 150
语种: 英语
英文关键词: cryosphere
; elevation
; glacier mass balance
; ice cap
; ICESat
; satellite imagery
; sensitivity analysis
; Arctic
; Iceland
; Svalbard
; Svalbard and Jan Mayen
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). Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/75349
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 Geodynamics, DTU Space, Technical University of Denmark, Elektrovej 327, Lyngby, Denmark; Ohio State University, 275 Mendenhall Lab, 125 S. Oval Mall, Columbus, OH, United States
Recommended Citation:
Nilsson J,, Sandberg Sørensen L,, Barletta V,et al. Mass changes in Arctic ice caps and glaciers: Implications of regionalizing elevation changes[J]. Cryosphere,2015-01-01,9(1)