dc.date.accessioned | 2018-07-09T09:56:39Z | |
dc.date.available | 2018-07-09T09:56:39Z | |
dc.date.created | 2018-01-04T10:37:11Z | |
dc.date.issued | 2017 | |
dc.identifier.citation | Jakob Fürst, Johannes Gillet-Chaulet, Fabien Benham, Toby Dowdeswell, Julian A. Grabiec, Mariusz Navarro, Francisco Pettersson, Rickard Moholdt, Geir Nuth, Christopher Sass, Björn Aas, Kjetil Schanke Fettweis, Xavier Lang, Charlotte Seehaus, Thorsten Braun, Matthias . Application of a two-step approach for mapping ice thickness to various glacier types on Svalbard. The Cryosphere. 2017, 11(5), 2003-2032 | |
dc.identifier.uri | http://hdl.handle.net/10852/62151 | |
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. | en_US |
dc.language | EN | |
dc.publisher | National Snow and Ice Data Center | |
dc.rights | Attribution 3.0 Unported | |
dc.rights.uri | https://creativecommons.org/licenses/by/3.0/ | |
dc.title | Application of a two-step approach for mapping ice thickness to various glacier types on Svalbard | en_US |
dc.type | Journal article | en_US |
dc.creator.author | Jakob Fürst, Johannes | |
dc.creator.author | Gillet-Chaulet, Fabien | |
dc.creator.author | Benham, Toby | |
dc.creator.author | Dowdeswell, Julian A. | |
dc.creator.author | Grabiec, Mariusz | |
dc.creator.author | Navarro, Francisco | |
dc.creator.author | Pettersson, Rickard | |
dc.creator.author | Moholdt, Geir | |
dc.creator.author | Nuth, Christopher | |
dc.creator.author | Sass, Björn | |
dc.creator.author | Aas, Kjetil Schanke | |
dc.creator.author | Fettweis, Xavier | |
dc.creator.author | Lang, Charlotte | |
dc.creator.author | Seehaus, Thorsten | |
dc.creator.author | Braun, Matthias | |
cristin.unitcode | 185,15,22,0 | |
cristin.unitname | Institutt for geofag | |
cristin.ispublished | true | |
cristin.fulltext | original | |
cristin.qualitycode | 2 | |
dc.identifier.cristin | 1535542 | |
dc.identifier.bibliographiccitation | info:ofi/fmt:kev:mtx:ctx&ctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.jtitle=The Cryosphere&rft.volume=11&rft.spage=2003&rft.date=2017 | |
dc.identifier.jtitle | The Cryosphere | |
dc.identifier.volume | 11 | |
dc.identifier.issue | 5 | |
dc.identifier.startpage | 2003 | |
dc.identifier.endpage | 2032 | |
dc.identifier.doi | http://dx.doi.org/10.5194/tc-11-2003-2017 | |
dc.identifier.urn | URN:NBN:no-64746 | |
dc.type.document | Tidsskriftartikkel | en_US |
dc.type.peerreviewed | Peer reviewed | |
dc.source.issn | 1994-0416 | |
dc.identifier.fulltext | Fulltext https://www.duo.uio.no/bitstream/handle/10852/62151/2/Fuerst_etal_2017.pdf | |
dc.type.version | PublishedVersion | |
dc.relation.project | EC/FP7/320816 | |
dc.relation.project | ESA/4000109873 | |