气候变化领域集成服务门户(CCPortal): An iterative inverse method to estimate basal topography and initialize ice flow models

CCPortal

DOI	10.5194/tc-7-987-2013
	An iterative inverse method to estimate basal topography and initialize ice flow models
	Van Pelt W.J.J.; Oerlemans J.; Reijmer C.H.; Pettersson R.; Pohjola V.A.; Isaksson E.; Divine D.
发表日期	2013
ISSN	19940416
卷号	7 期号:3
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).
学科领域	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
语种	英语
scopus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
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/120284
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
推荐引用方式 GB/T 7714	Van Pelt W.J.J.,Oerlemans J.,Reijmer C.H.,et al. An iterative inverse method to estimate basal topography and initialize ice flow models[J],2013,7(3).
APA	Van Pelt W.J.J..,Oerlemans J..,Reijmer C.H..,Pettersson R..,Pohjola V.A..,...&Divine D..(2013).An iterative inverse method to estimate basal topography and initialize ice flow models.Cryosphere,7(3).
MLA	Van Pelt W.J.J.,et al."An iterative inverse method to estimate basal topography and initialize ice flow models".Cryosphere 7.3(2013).