Benjamin Hills
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View article: Radar Polarimetry in Glaciology: Theory, Measurement Techniques, and Scientific Applications for Investigating the Anisotropy of Ice Masses
Radar Polarimetry in Glaciology: Theory, Measurement Techniques, and Scientific Applications for Investigating the Anisotropy of Ice Masses Open
Dielectric anisotropy in ice alters the propagation of polarized radio waves, so polarimetric radar sounding can be used to survey anisotropic properties of ice masses. Ice anisotropy is either intrinsic, associated with ice‐crystal orient…
View article: Review article: AntArchitecture – building an age–depth model from Antarctica's radiostratigraphy to explore ice-sheet evolution
Review article: AntArchitecture – building an age–depth model from Antarctica's radiostratigraphy to explore ice-sheet evolution Open
Radio-echo sounding (RES) has revealed an internal architecture within both the West and East Antarctic ice sheets that records their depositional, deformational and melting histories. Crucially, RES-imaged internal-reflecting horizons, ti…
View article: Entrained debris records regrowth of the Greenland Ice Sheet after the last interglacial
Entrained debris records regrowth of the Greenland Ice Sheet after the last interglacial Open
Radio-echo sounding data capture intensely deformed structures deep within the ice sheet in Northern Greenland. Using technology developed for radar swath imaging, we measure the 3D scattering field of englacial structures and infer their …
View article: Review Article: The Foundation-Patuxent-Academy ice stream system, Antarctica
Review Article: The Foundation-Patuxent-Academy ice stream system, Antarctica Open
The Foundation-Patuxent-Academy system (FPAS) is a major Antarctic ice stream system with a global sea level potential of ~3 m. Draining both East and West Antarctica, the FPAS has been understudied compared with other major Antarctic ice …
View article: Investigating fabric signatures in the South Pole - Dome A sector, Antarctica
Investigating fabric signatures in the South Pole - Dome A sector, Antarctica Open
The uniaxial crystalline symmetry of an ice crystal gives rise to anisotropy in its electrical and mechanical behavior. Deformation of polycrystalline ice leads to preferential enhancement of these properties in certain orientations which …
View article: Review Article: Antarctica’s internal architecture: Towards a radiostratigraphically-informed age–depth model of the Antarctic ice sheets
Review Article: Antarctica’s internal architecture: Towards a radiostratigraphically-informed age–depth model of the Antarctic ice sheets Open
Radio-echo sounding (RES) has revealed an internal architecture within Antarctica’s ice sheets that records their depositional, deformational and melting histories. Crucially, spatially-widespread RES-imaged internal-reflecting horizons, t…
View article: Entrained Water in Basal Ice Suppresses Radar Bed‐Echo Power at Active Subglacial Lakes
Entrained Water in Basal Ice Suppresses Radar Bed‐Echo Power at Active Subglacial Lakes Open
Subglacial lakes have been mapped across Antarctica with two methods, radio‐echo sounding (RES) and ice‐surface deformation. At sites where both are coincident, these methods typically provide conflicting interpretations about the ice‐bed …
View article: Comment on egusphere-2023-2731
Comment on egusphere-2023-2731 Open
Abstract. Radio-echo sounding is a standard technique for imaging the englacial stratigraphy of glaciers and ice sheets. In most cases, internal reflection horizons (IRHs) represent former glacier surfaces and comprise information about pa…
View article: Effective diffusivity of sulfuric acid in Antarctic ice cores
Effective diffusivity of sulfuric acid in Antarctic ice cores Open
Deposition of sulfuric acid in ice cores is important both for understanding past volcanic activity and for synchronizing ice core timescales. Sulfuric acid has a low eutectic point, so it can potentially exist in liquid at grain boundarie…
View article: Scars of tectonism promote ice-sheet nucleation from Hercules Dome into West Antarctica
Scars of tectonism promote ice-sheet nucleation from Hercules Dome into West Antarctica Open
Geology and bed topography influence how ice sheets respond to climate change. Despite the West Antarctic Ice Sheet’s capacity to retreat and advance quickly over its over-deepened interior, little is known about the subglacial landscape o…
View article: Greenland and Canadian Arctic ice temperature profiles database
Greenland and Canadian Arctic ice temperature profiles database Open
Here, we present a compilation of 95 ice temperature profiles from 85 boreholes from the Greenland ice sheet and peripheral ice caps, as well as local ice caps in the Canadian Arctic. Profiles from only 31 boreholes (36 %) were previously …
View article: Antarctic Bedmap data: Findable, Accessible, Interoperable, and Reusable (FAIR) sharing of 60 years of ice bed, surface, and thickness data
Antarctic Bedmap data: Findable, Accessible, Interoperable, and Reusable (FAIR) sharing of 60 years of ice bed, surface, and thickness data Open
One of the key components of this research has been the mapping of Antarctic bed topography and ice thickness parameters that are crucial for modelling ice flow and hence for predicting future ice loss and the ensuing sea level rise. Suppo…
View article: Comment on essd-2022-355
Comment on essd-2022-355 Open
Abstract. Over the past 60 years, scientists have strived to understand the past, present and future of the Antarctic Ice Sheet. One of the key components of this research has been the mapping of Antarctic bed topography and ice thickness …
View article: Effective diffusivity of sulfuric acid in Antarctic ice cores
Effective diffusivity of sulfuric acid in Antarctic ice cores Open
Volcanic deposition of sulfuric acid in ice cores is important both for understanding past volcanic activity and for synchronizing ice core timescales. Sulfuric acid has a low eutectic point, so it can potentially exist in liquid at grain …
View article: Antarctic Bedmap data: FAIR sharing of 60 years of ice bed, surface and thickness data
Antarctic Bedmap data: FAIR sharing of 60 years of ice bed, surface and thickness data Open
Over the past 60 years, scientists have strived to understand the past, present and future of the Antarctic Ice Sheet. One of the key components of this research has been the mapping of Antarctic bed topography and ice thickness parameters…
View article: Radar attenuation demonstrates advective cooling in the Siple Coast ice streams
Radar attenuation demonstrates advective cooling in the Siple Coast ice streams Open
Ice streams are warmed by shear strain, both vertical shear near the bed and lateral shear at the margins. Warm ice deforms more easily, establishing a positive feedback loop in an ice stream where fast flow leads to warm ice and then to e…
View article: A site for deep ice coring at West Hercules Dome: results from ground-based geophysics and modeling
A site for deep ice coring at West Hercules Dome: results from ground-based geophysics and modeling Open
Hercules Dome, Antarctica, has long been identified as a prospective deep ice core site due to the undisturbed internal layering, climatic setting and potential to obtain proxy records from the Last Interglacial (LIG) period when the West …
View article: Greenland and Canadian Arctic ice temperature profiles
Greenland and Canadian Arctic ice temperature profiles Open
Here, we present a compilation of 85 ice temperature profiles from 79 boreholes from the Greenland Ice Sheet and peripheral ice caps, as well as local ice caps in the Canadian Arctic. Only 25 profiles (32 %) were previously available in op…
View article: Geophysics and Thermodynamics at South Pole Lake Indicate Stability and a Regionally Thawed Bed
Geophysics and Thermodynamics at South Pole Lake Indicate Stability and a Regionally Thawed Bed Open
Subglacial lakes require a thawed bed either now or in the past; thus, their presence and stability have implications for current and past basal conditions, ice dynamics, and climate. Here, we present the most extensive geophysical explora…
View article: Avoiding slush for hot-point drilling of glacier boreholes
Avoiding slush for hot-point drilling of glacier boreholes Open
Water-filled boreholes in cold ice refreeze in hours to days, and prior attempts to keep them open with antifreeze resulted in a plug of slush effectively freezing the hole even faster. Thus, antifreeze as a method to stabilize hot-water b…
View article: A framework for attenuation method selection evaluated with ice-penetrating radar data at South Pole Lake
A framework for attenuation method selection evaluated with ice-penetrating radar data at South Pole Lake Open
All radar power interpretations require a correction for attenuative losses. Moreover, radar attenuation is a proxy for ice-column properties, such as temperature and chemistry. Prior studies use either paired thermodynamic and conductivit…
View article: ImpDAR: an open-source impulse radar processor
ImpDAR: an open-source impulse radar processor Open
Despite widespread use of radio-echo sounding (RES) in glaciology and broad distribution of processed radar products, the glaciological community has no standard software for processing impulse RES data. Dependable, fast and collection-sys…
View article: South Pole Lake: ground-based ice-penetrating radar
South Pole Lake: ground-based ice-penetrating radar Open
This archive contains ice-penetrating radar data for a subglacial lake survey near the geographic South Pole.
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\nGround-based ice-penetrating radar data collected over a subglacial lake ~15 km from the geographic South Pole. Included are…
View article: Processes influencing heat transfer in the near-surface ice of Greenland's ablation zone
Processes influencing heat transfer in the near-surface ice of Greenland's ablation zone Open
To assess the influence of various heat transfer processes on the thermal structure of near-surface ice in Greenland's ablation zone, we compare in situ measurements with thermal modeling experiments. A total of seven temperature strings w…
View article: Processes influencing near-surface heat transfer in Greenland's ablation zone
Processes influencing near-surface heat transfer in Greenland's ablation zone Open
To assess the influence of various mechanisms of heat transfer on the near-surface ice of Greenland's ablation zone, we incorporate highly resolved measurements of ice temperature into thermal modeling experiments. Seven separate temperatu…
View article: 2017 T Division Lightning Talks
2017 T Division Lightning Talks Open
All members of the T Division Community, students, staff members, group leaders, division management, and other interested individuals are invited to come and support the following student(s) as they present their Lightning Talks.