DOI: 10.5194/tc-7-987-2013
Scopus记录号: 2-s2.0-84880786155
论文题名: An iterative inverse method to estimate basal topography and initialize ice flow models
作者: Van Pelt W ; J ; J ; , Oerlemans J ; , Reijmer C ; H ; , Pettersson R ; , Pohjola V ; A ; , Isaksson E ; , Divine D
刊名: Cryosphere
ISSN: 19940416
出版年: 2013
卷: 7, 期: 3 起始页码: 987
结束页码: 1006
语种: 英语
英文关键词: bedrock
; climate conditions
; flow modeling
; forecasting method
; ice cap
; ice flow
; ice thickness
; inverse analysis
; reconstruction
; topography
; uncertainty analysis
; Arctic
; Nordenskioldbreen
; Spitsbergen
; Svalbard
; Svalbard and Jan Mayen
英文摘要: We evaluate an inverse approach to reconstruct distributed bedrock topography and simultaneously initialize an ice flow model. The inverse method involves an iterative procedure in which an ice dynamical model (PISM) is run multiple times over a prescribed period, while being forced with space-and time-dependent climate input. After every iteration bed heights are adjusted using information of the remaining misfit between observed and modeled surface topography. The inverse method is first applied in synthetic experiments with a constant climate forcing to verify convergence and robustness of the approach in three dimensions. In a next step, the inverse approach is applied to Nordenskiöldbreen, Svalbard, forced with height-and time-dependent climate input since 1300 AD. An L-curve stopping criterion is used to prevent overfitting. Validation against radar data reveals a high correlation (up to R = 0.89) between modeled and observed thicknesses. Remaining uncertainties can mainly be ascribed to inaccurate model physics, in particular, uncertainty in the description of sliding. Results demonstrate the applicability of this inverse method to reconstruct the ice thickness distribution of glaciers and ice caps. In addition to reconstructing bedrock topography, the method provides a direct tool to initialize ice flow models for forecasting experiments. © 2013 Author(s). Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/74973
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: Institute for Marine and Atmospheric Research, Utrecht University, Utrecht, Netherlands; Department of Earth Sciences, Uppsala University, Uppsala, Sweden; Norwegian Polar Institute, Tromsandø, Norway
Recommended Citation:
Van Pelt W,J,J,et al. An iterative inverse method to estimate basal topography and initialize ice flow models[J]. Cryosphere,2013-01-01,7(3)