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Application of a tw...
Application of a two-step approach for mapping ice thickness to various glacier types on Svalbard
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- Fuerst, Johannes Jakob (author)
- University of Erlangen-Nuremberg, Institute of Geography
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- Gillet-Chaulet, Fabien (author)
- University of Grenoble Alpes, CNRS, IRD, Institut des Géosciences de l’Environnement (IGE)
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- Benham, Toby J. (author)
- University of Cambridge, Scott Polar Research Institute
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- Dowdeswell, Julian A. (author)
- University of Cambridge, Scott Polar Research Institute
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- Grabiec, Mariusz (author)
- University of Silesia in Katowice, Faculty of Earth Sciences
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- Navarro, Francisco (author)
- Universidad Politécnica de Madrid, Departamento de Matemática Aplicada a las Tecnologías de la Información y las Comunicaciones, desp. A302-4, ETSI de Telecomunicación
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- Pettersson, Rickard (author)
- Uppsala universitet,Luft-, vatten- och landskapslära
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- Moholdt, Geir (author)
- Norwegian Polar Institute, Fram Centre
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- Nuth, Christopher (author)
- University of Oslo, Department of Geoscience
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- Sass, Björn (author)
- University of Erlangen-Nuremberg, Institute of Geography
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- Aas, Kjetil (author)
- University of Oslo, Department of Geoscience
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- Fettweis, Xavier (author)
- University of Liège, Department of Geography
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- Lang, Charlotte (author)
- University of Liège, Department of Geography
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- Seehaus, Thorsten (author)
- University of Erlangen-Nuremberg, Institute of Geography
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- Braun, Matthias (author)
- University of Erlangen-Nuremberg, Institute of Geography
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(creator_code:org_t)
- 2017-09-01
- 2017
- English.
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In: The Cryosphere. - : Copernicus GmbH. - 1994-0416 .- 1994-0424. ; 11:5, s. 2003-2032
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Abstract
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- The basal topography is largely unknown beneath most glaciers and ice caps, and many attempts have been made to estimate a thickness field from other more accessible information at the surface. Here, we present a two-step reconstruction approach for ice thickness that solves mass conservation over single or several connected drainage basins. The approach is applied to a variety of test geometries with abundant thickness measurements including marine-and landterminating glaciers as well as a 2400 km(2) ice cap on Svalbard. The input requirements are kept to a minimum for the first step. In this step, a geometrically controlled, non-local flux solution is converted into thickness values relying on the shallow ice approximation (SIA). In a second step, the thickness field is updated along fast-flowing glacier trunks on the basis of velocity observations. Both steps account for available thickness measurements. Each thickness field is presented together with an error-estimate map based on a formal propagation of input uncertainties. These error estimates point out that the thickness field is least constrained near ice divides or in other stagnant areas. Withholding a share of the thickness measurements, error estimates tend to overestimate mismatch values in a median sense. We also have to accept an aggregate uncertainty of at least 25% in the reconstructed thickness field for glaciers with very sparse or no observations. For Vestfonna ice cap (VIC), a previous ice volume estimate based on the same measurement record as used here has to be corrected upward by 22 %. We also find that a 13% area fraction of the ice cap is in fact grounded below sea level. The former 5% estimate from a direct measurement interpolation exceeds an aggregate maximum range of 6-23% as inferred from the error estimates here.
Subject headings
- NATURVETENSKAP -- Geovetenskap och miljövetenskap -- Geologi (hsv//swe)
- NATURAL SCIENCES -- Earth and Related Environmental Sciences -- Geology (hsv//eng)
- NATURVETENSKAP -- Geovetenskap och miljövetenskap -- Naturgeografi (hsv//swe)
- NATURAL SCIENCES -- Earth and Related Environmental Sciences -- Physical Geography (hsv//eng)
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Fuerst, Johannes ...
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Gillet-Chaulet, ...
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Benham, Toby J.
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Dowdeswell, Juli ...
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Grabiec, Mariusz
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Navarro, Francis ...
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Pettersson, Rick ...
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Moholdt, Geir
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Nuth, Christophe ...
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Sass, Björn
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Aas, Kjetil
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Fettweis, Xavier
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Lang, Charlotte
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Seehaus, Thorste ...
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Braun, Matthias
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- About the subject
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Earth and Relate ...
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and Geology
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Earth and Relate ...
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and Physical Geograp ...
- Articles in the publication
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The Cryosphere
- By the university
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Uppsala University