uu.seUppsala University Publications
Change search
ReferencesLink to record
Permanent link

Direct link
An iterative inverse method to estimate basal topography and initialize ice flow models
Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, LUVAL.
Show others and affiliations
2013 (English)In: The Cryosphere, ISSN 1994-0416, E-ISSN 1994-0424, Vol. 7, no 3, 987-1006 p.Article in journal (Refereed) Published
Abstract [en]

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 Nordenskioldbreen, 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.

Place, publisher, year, edition, pages
2013. Vol. 7, no 3, 987-1006 p.
National Category
Natural Sciences
URN: urn:nbn:se:uu:diva-205409DOI: 10.5194/tc-7-987-2013ISI: 000321144100018OAI: oai:DiVA.org:uu-205409DiVA: diva2:642129
Available from: 2013-08-20 Created: 2013-08-16 Last updated: 2013-08-20Bibliographically approved

Open Access in DiVA

fulltext(10892 kB)153 downloads
File information
File name FULLTEXT01.pdfFile size 10892 kBChecksum SHA-512
Type fulltextMimetype application/pdf

Other links

Publisher's full text

Search in DiVA

By author/editor
Pettersson, RikardPohjola, Veijo A.
By organisation
In the same journal
The Cryosphere
Natural Sciences

Search outside of DiVA

GoogleGoogle Scholar
Total: 153 downloads
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

Altmetric score

Total: 543 hits
ReferencesLink to record
Permanent link

Direct link