Andrew O. Hoffman

Late Holocene stabilization of Conway Ice Ridge

Andrew O. Hoffman, Paul T. Summers, Jenny Suckale, Knut Christianson et autres

Abstract. Marine ice sheets are low-pass filters of climate variability that take centuries to millenia to adjust to interior and near-terminus changes in mass balance. Constraining these long-term changes from satellite altimetry and velocity observations that span only the last 40 years …

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Hard rocks and deep wetlands beneath Thwaites Glacier in Antarctica

Ole Zeising, Olaf Eisen, Coen Hofstede, Ronan Agnew et autres

Thwaites Glacier in West Antarctica is losing ice rapidly and is considered especially vulnerable to retreat, but predictions of its future remain limited by uncertainties about its subglacial properties. Here we show results from 344 km of vibroseismic surveys collected along and …

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Radar swath imaging of glaciers and ice sheets

Nicholas Holschuh, Olaf Eisen, C. R. Carter, Steven Franke et autres

Multichannel ice-penetrating radar systems can be used to generate radar volumes: three-dimensional data structures that capture variability in backscattering intensity as a function of along-track position, two-way travel time and elevation angle. By digitizing surfaces within these data volumes, the production of …

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Entrained debris records regrowth of the Greenland Ice Sheet after the last interglacial

Nicholas Holschuh, Knut Christianson, William Dienstfrey, Benjamin Hills et autres

Radio echo sounding data reveal intensely deformed structures deep within the northern Greenland Ice Sheet. The geometry of these structures has been well studied, but their physical properties remain poorly understood. Here we investigate their scattering characteristics using radar swath imaging. Strong, …

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Melt channelization stronger than previously recognized

Andrew O. Hoffman

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Hard rocks and deep wetlands: characterizing the bed of Thwaites Glacier, Antarctica, from vibroseismic measurements

Ole Zeising, Olaf Eisen, Coen Hofstede, Alex Brisbourne et autres

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Entrained debris records regrowth of the Greenland Ice Sheet after the last interglacial

Nicholas Holschuh, Knut Christianson, William Dienstfrey, Benjamin Hills et autres

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Active and Passive Seismic Surveys over the Grounding Zone of Eastwind Glacier, Antarctica

Ronan Agnew, Emma Pearce, M. S. Karplus, Meghana Ranganathan et autres

Abstract The grounding zone of a marine-terminating glacier, where ice begins to float, is a key control on glacier stability and ice discharge. Seismic deployments are a powerful means of studying both the geometry and processes of grounding zones; however, these regions …

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Comment on egusphere-2025-1239

Andrew O. Hoffman, Paul T. Summers, Jenny Suckale, Knut Christianson et autres

Abstract. Marine ice sheets are low-pass filters of climate variability that take centuries to millenia to adjust to interior and near-terminus changes in mass balance. Constraining these long-term changes from satellite altimetry and velocity observations that span only the last 40 years …

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Discharge Promotes Melt and Formation of Submarine Ice‐Shelf Channels at the Beardmore Glacier Grounding Zone

Andrew O. Hoffman, H. Conway, Joséphine Anselin, Keith W. Nicholls et autres

Abstract Using radar data from the Beardmore Glacier grounding zone, we image a narrow subglacial channel ( m wide) that reaches a height of 200 m above the ambient ice‐shelf draft. Using repeat ICESat‐2 observations and Worldview digital elevation models, we show …

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Publisher Correction: Atmospheric rivers in Antarctica

Jonathan Wille, Vincent Favier, Irina Gorodetskaya, Cécile Agosta et autres

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Inland migration of near-surface crevasses in the Amundsen Sea Sector, West Antarctica

Andrew O. Hoffman, Knut Christianson, Ching‐Yao Lai, Ian Joughin et autres

Since distributed satellite observations of elevation change and velocity became available in the 1990s, Thwaites, Pine Island, Haynes, Pope and Kohler glaciers, located in Antarctica's Amundsen Sea Sector, have thinned and accelerated in response to ocean-induced melting and grounding-line retreat. We develop …

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