Priska A Hunkeler

The safety case for a deep geological repository in Switzerland: assessment and modelling of the biosphere

Ashley Brown, Raphael A.J. Wüst, Russell Walke, Rebecca Newson et autres

The post-closure biosphere assessment and modelling in support of the general licence application for a deep geological repository for radioactive waste provides the basis for evaluating radiological consequences should radionuclides released from the geological repository reach the surface and near-surface environments. The …

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Unfiltered snow surface height above sea level on station PS81/517_GPS1

Nander Wever, Priska A Hunkeler, Ted Maksym, Katherine Leonard

GEM-2 combined snow and ice thickness during a floe-scale walk on station PS81/517_GPS1

Nander Wever, Priska A Hunkeler, Ted Maksym, Katherine Leonard

Snow and ice thickness measurements from Terrestrial Laser Scanning, Magnaprobe and GEM-2 on ice stations PS81/503, PS81/506 and PS81/517 from Weddell Sea, Antarctica, 2013

Nander Wever, S. White, Priska A Hunkeler, Ted Maksym et autres

Spatial snow and ice thickness measurements from ice stations PS81/503, PS81/506 and PS81/517 from Research Vessel Polarstern in the Antarctic Weddell Sea in austral winter 2013 (cruise leg ANT-XXIX/6, AWECS campaign). Terrestrial laser scanning (TLS) was used to determine the snow surface …

Sea-ice thickness and porosity from multi-frequency electromagnetic induction sounding: Application to the sub-ice platelet layer in Atka Bay, Antarctica

Priska A Hunkeler

Characterization of the sea-ice cover is of great importance for understanding processes and feedback mechanisms and predicting the evolution of the polar-climate system. One important climate relevant parameter, which can be used for this characterization, is sea-ice thickness. It can be retrieved …

A glimpse beneath Antarctic sea ice: Platelet layer volume from multifrequency electromagnetic induction sounding

Priska A Hunkeler, Mario Hoppmann, Stefan Hendricks, Thomas Kalscheuer et autres

Abstract In Antarctica, ice crystals emerge from ice shelf cavities and accumulate in unconsolidated layers beneath nearby sea ice. Such sub‐ice platelet layers form a unique habitat and serve as an indicator for the state of an ice shelf. However, the lack …

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A glimpse beneath Antarctic sea ice: observation of platelet-layer thickness and ice-volume fraction with multi-frequency EM

Mario Hoppmann, Priska A Hunkeler, Stefan Hendricks, Thomas Kalscheuer et autres

In Antarctica, ice crystals (platelets) form and grow in supercooled waters below ice shelves. These \nplatelets rise, accumulate beneath nearby sea ice, and form a several meter thick sub-ice platelet \nlayer. This special ice type is a unique habitat, influences sea-ice mass …

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Improved 1D inversions for sea ice thickness and conductivity from electromagnetic induction data: Inclusion of nonlinearities caused by passive bucking

Priska A Hunkeler, Stefan Hendricks, Mario Hoppmann, Colin G. Farquharson et autres

ABSTRACT The porosity of sea ice is a fundamental physical parameter that governs the mechanical strength of sea ice and the mobility of gases and nutrients for biological processes and biogeochemical cycles in the sea ice layer. However, little is known about …

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2.5D Inversion of Sea Ice Thickness from Helicopter EM Data

Malte Vöge, Andreas Aspmo Pfaffhuber, Esben Auken, Casper Kirkegaard et autres

Summary In this paper, we present a new 2D inversion approach to invert helicopter EM data for sea-ice thicknesses. The approach uses a 2.5D finite element frequency-domain solution of the Maxwell-Equations for the secondary field. Instead of inverting for resistivity values from …

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Seasonal evolution of an ice‐shelf influenced fast‐ice regime, derived from an autonomous thermistor chain

Mario Hoppmann, Marcel Nicolaus, Priska A Hunkeler, Petra Heil et autres

Abstract Ice shelves strongly interact with coastal Antarctic sea ice and the associated ecosystem by creating conditions favorable to the formation of a sub‐ice platelet layer. The close investigation of this phenomenon and its seasonal evolution remains a challenge due to logistical …

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The impact of early-summer snow properties on Antarctic landfast sea-ice X-band backscatter

Stephan Paul, Sascha Willmes, Mario Hoppmann, Priska A Hunkeler et autres

Abstract Up to now, snow cover on Antarctic sea ice and its impact on radar backscatter, particularly after the onset of freeze/thaw processes, are not well understood. Here we present a combined analysis of in situ observations of snow properties from the …

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Ice platelets below Weddell Sea landfast sea ice

Mario Hoppmann, Marcel Nicolaus, Stephan Paul, Priska A Hunkeler et autres

Abstract Basal melt of ice shelves may lead to an accumulation of disc-shaped ice platelets underneath nearby sea ice, to form a sub-ice platelet layer. Here we present the seasonal cycle of sea ice attached to the Ekström Ice Shelf, Antarctica, and …

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