DC pole | Wartość | Język |
dc.contributor.author | Furst, Johannes Jakob | - |
dc.contributor.author | Gillet-Chaulet, Fabien | - |
dc.contributor.author | Benham, Toby J. | - |
dc.contributor.author | Dowdeswell, Julian A. | - |
dc.contributor.author | Grabiec, Mariusz | - |
dc.contributor.author | Navarro, Francisco | - |
dc.contributor.author | Pettersson, Rickard | - |
dc.contributor.author | Moholdt, Geir | - |
dc.contributor.author | Nuth, Christopher | - |
dc.contributor.author | Sass, Bjorn | - |
dc.contributor.author | Aas, Kjetil | - |
dc.contributor.author | Fettweis, Xavier | - |
dc.contributor.author | Lang, Charlotte | - |
dc.contributor.author | Seehaus, Thorsten | - |
dc.contributor.author | Braun, Matthias | - |
dc.date.accessioned | 2017-11-18T21:15:00Z | - |
dc.date.available | 2017-11-18T21:15:00Z | - |
dc.date.issued | 2017 | - |
dc.identifier.citation | Cryosphere, Vol. 11, iss. 5 (2017), s. 2003-2032 | pl_PL |
dc.identifier.issn | 1994-0416 | - |
dc.identifier.uri | http://hdl.handle.net/20.500.12128/368 | - |
dc.description.abstract | 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 land-terminating glaciers as well as a 2400-km2 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. | pl_PL |
dc.language.iso | en | pl_PL |
dc.rights | Uznanie autorstwa 3.0 Polska | * |
dc.rights.uri | http://creativecommons.org/licenses/by/3.0/pl/ | * |
dc.subject | Ice thickness | pl_PL |
dc.subject | Mapping method | pl_PL |
dc.title | Application of a two-step approach for mapping ice thickness to various glacier types on Svalbard | pl_PL |
dc.type | info:eu-repo/semantics/article | pl_PL |
dc.relation.journal | Cryosphere | pl_PL |
dc.identifier.doi | 10.5194/tc-11-2003-2017 | - |
Pojawia się w kolekcji: | Artykuły (WNP)
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