DOI: 10.5194/tc-11-1235-2017
Scopus记录号: 2-s2.0-85019591834
论文题名: A new approach to estimate ice dynamic rates using satellite observations in East Antarctica
作者: Kallenberg B ; , Tregoning P ; , Fabian Hoffmann J ; , Hawkins R ; , Purcell A ; , Allgeyer S
刊名: Cryosphere
ISSN: 19940416
出版年: 2017
卷: 11, 期: 3 起始页码: 1235
结束页码: 1245
语种: 英语
英文关键词: discharge
; elevation
; estimation method
; gravity survey
; ice sheet
; mass balance
; model test
; regional climate
; satellite altimetry
; satellite data
; snow
; Antarctica
; East Antarctica
英文摘要: Mass balance changes of the Antarctic ice sheet are of significant interest due to its sensitivity to climatic changes and its contribution to changes in global sea level. While regional climate models successfully estimate mass input due to snowfall, it remains difficult to estimate the amount of mass loss due to ice dynamic processes. It has often been assumed that changes in ice dynamic rates only need to be considered when assessing long-term ice sheet mass balance; however, 2 decades of satellite altimetry observations reveal that the Antarctic ice sheet changes unexpectedly and much more dynamically than previously expected. Despite available estimates on ice dynamic rates obtained from radar altimetry, information about ice sheet changes due to changes in the ice dynamics are still limited, especially in East Antarctica. Without understanding ice dynamic rates, it is not possible to properly assess changes in ice sheet mass balance and surface elevation or to develop ice sheet models. In this study we investigate the possibility of estimating ice sheet changes due to ice dynamic rates by removing modelled rates of surface mass balance, firn compaction, and bedrock uplift from satellite altimetry and gravity observations. With similar rates of ice discharge acquired from two different satellite missions we show that it is possible to obtain an approximation of the rate of change due to ice dynamics by combining altimetry and gravity observations. Thus, surface elevation changes due to surface mass balance, firn compaction, and ice dynamic rates can be modelled and correlated with observed elevation changes from satellite altimetry. © 2017 Author(s). Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/75565
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: Research School of Earth Sciences, Australian National University, Canberra, ACT, Australia; EarthX, 55 Park Lane, London, United Kingdom
Recommended Citation:
Kallenberg B,, Tregoning P,, Fabian Hoffmann J,et al. A new approach to estimate ice dynamic rates using satellite observations in East Antarctica[J]. Cryosphere,2017-01-01,11(3)