WorldCat Identities

Nuth, Christopher

Overview
Works: 14 works in 17 publications in 1 language and 32 library holdings
Roles: Author
Publication Timeline
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Most widely held works by Christopher Nuth
Using SAR satellite data time-series for regional glacier mapping by Solveig H Winsvold( )

2 editions published between 2017 and 2018 in English and held by 4 WorldCat member libraries worldwide

Subglacial topography, ice thickness, and bathymetry of Kongsfjorden, northwestern Svalbard by Katrin Lindbäck( )

2 editions published in 2018 in English and held by 4 WorldCat member libraries worldwide

Application of a two-step approach for mapping ice thickness to various glacier types on Svalbard by Johannes Jakob Fürst( )

2 editions published in 2017 in English and held by 3 WorldCat member libraries worldwide

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
Influence of environmental parameters on the use and spatiotemporal distribution of the vocalizations of bearded seals (Erignathus barbatus) in Kongsfjorden, Spitsbergen by Giovanni de Vincenzi( )

1 edition published in 2019 in English and held by 2 WorldCat member libraries worldwide

Terrain changes from images acquired on opportunistic flights by SfM photogrammetry by Luc Girod( )

1 edition published in 2017 in English and held by 2 WorldCat member libraries worldwide

Precise DEM extraction from Svalbard using 1936 high oblique imagery by Luc Girod( )

1 edition published in 2018 in English and held by 2 WorldCat member libraries worldwide

Seismic Monitoring of Glacier Activity on Svalbard (SEISMOGLAC) - Report by Andreas Köhler( )

1 edition published in 2018 in English and held by 2 WorldCat member libraries worldwide

Dynamic vulnerability revealed in the collapse of an Arctic tidewater glacier by Christopher Nuth( )

1 edition published in 2019 in English and held by 2 WorldCat member libraries worldwide

Precise DEM extraction from oblique imagery of Svalbard in 1936 by Luc Girod( )

1 edition published in 2018 in English and held by 2 WorldCat member libraries worldwide

Sensitivity of geodetic glacier mass balance estimation to DEM void interpolation by Robert McNabb( )

1 edition published in 2018 in English and held by 2 WorldCat member libraries worldwide

Contribution of calving to frontal ablation quantified from seismic and hydroacoustic observations calibrated with lidar volume measurements by Andreas Köhler( )

1 edition published in 2019 in English and held by 2 WorldCat member libraries worldwide

Sensitivity of glacier volume change estimation to DEM void interpolation by Robert McNabb( )

1 edition published in 2019 in English and held by 2 WorldCat member libraries worldwide

Glacier dynamic ice loss quantified through seismic eyes (CALVINGSEIS) Report by Andreas Köhler( )

1 edition published in 2019 in English and held by 2 WorldCat member libraries worldwide

Using SAR data time-series for regional glacier mapping by Solveig Winsvold( )

1 edition published in 2018 in English and held by 1 WorldCat member library worldwide

With dense SAR satellite data time series it is possible to map surface and subsurface glacier properties that vary in time. On Sentinel-1A and RADARSAT-2 backscatter time series images over mainland Norway and Svalbard, we outline how to map glaciers using descriptive methods. We present five application scenarios. The first shows potential for tracking transient snow lines with SAR backscatter time series and correlates with both optical satellite images (Sentinel-2A and Landsat 8) and equilibrium line altitudes derived from in situ surface mass balance data. In the second application scenario, time series representation of glacier facies corresponding to SAR glacier zones shows potential for a more accurate delineation of the zones and how they change in time. The third application scenario investigates the firn evolution using dense SAR backscatter time series together with a coupled energy balance and multilayer firn model. We find strong correlation between backscatter signals with both the modeled firn air content and modeled wetness in the firn. In the fourth application scenario, we highlight how winter rain events can be detected in SAR time series, revealing important information about the area extent of internal accumulation. In the last application scenario, averaged summer SAR images were found to have potential in assisting the process of mapping glaciers outlines, especially in the presence of seasonal snow. Altogether we present examples of how to map glaciers and to further understand glaciological processes using the existing and future massive amount of multi-sensor time series data
 
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Languages
English (17)