DOI: 10.5194/tc-9-805-2015
Scopus记录号: 2-s2.0-84928737456
论文题名: Simultaneous solution for mass trends on the West Antarctic Ice Sheet
作者: Schoen N ; , Zammit-Mangion A ; , Rougier J ; C ; , Flament T ; , Rémy F ; , Luthcke S ; , Bamber J ; L
刊名: Cryosphere
ISSN: 19940416
出版年: 2015
卷: 9, 期: 2 起始页码: 805
结束页码: 819
语种: 英语
英文关键词: glacier mass balance
; glacioisostasy
; sea level change
; spatiotemporal analysis
; Antarctic Ice Sheet
; Antarctic Peninsula
; Antarctica
; West Antarctica
英文摘要: The Antarctic Ice Sheet is the largest potential source of future sea-level rise. Mass loss has been increasing over the last 2 decades for the West Antarctic Ice Sheet (WAIS) but with significant discrepancies between estimates, especially for the Antarctic Peninsula. Most of these estimates utilise geophysical models to explicitly correct the observations for (unobserved) processes. Systematic errors in these models introduce biases in the results which are difficult to quantify. In this study, we provide a statistically rigorous error-bounded trend estimate of ice mass loss over the WAIS from 2003 to 2009 which is almost entirely data driven. Using altimetry, gravimetry, and GPS data in a hierarchical Bayesian framework, we derive spatial fields for ice mass change, surface mass balance, and glacial isostatic adjustment (GIA) without relying explicitly on forward models. The approach we use separates mass and height change contributions from different processes, reproducing spatial features found in, for example, regional climate and GIA forward models, and provides an independent estimate which can be used to validate and test the models. In addition, spatial error estimates are derived for each field. The mass loss estimates we obtain are smaller than some recent results, with a time-averaged mean rate of -76 ± 15 Gt yr-1 for the WAIS and Antarctic Peninsula, including the major Antarctic islands. The GIA estimate compares well with results obtained from recent forward models (IJ05-R2) and inverse methods (AGE-1). The Bayesian framework is sufficiently flexible that it can, eventually, be used for the whole of Antarctica, be adapted for other ice sheets and utilise data from other sources such as ice cores, accumulation radar data, and other measurements that contain information about any of the processes that are solved for. © Author(s) 2015. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/75309
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: Bristol Glaciology Centre, School of Geographical Sciences, University of Bristol, United Kingdom; Department of Mathematics, University of Bristol, United Kingdom; LEGOS, Toulouse, France; NASA, Greenbelt, MD, United States
Recommended Citation:
Schoen N,, Zammit-Mangion A,, Rougier J,et al. Simultaneous solution for mass trends on the West Antarctic Ice Sheet[J]. Cryosphere,2015-01-01,9(2)