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Your search keyword '"Alley, Richard B."' showing total 30 results
Start Over Author "Alley, Richard B." Journal annals of glaciology
30 results on '"Alley, Richard B."'

1. GHOSTly flute music: drumlins, moats and the bed of Thwaites Glacier

Author

Alley, Richard B., primary, Holschuh, Nick, additional, Parizek, Byron, additional, Zoet, Lucas K., additional, Riverman, Kiya, additional, Muto, Atsuhiro, additional, Christianson, Knut, additional, Clyne, Elisabeth, additional, Anandakrishnan, Sridhar, additional, and Stevens, Nathan T., additional

Published
2023
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2. The role of channelized basal melt in ice-shelf stability: recent progress and future priorities.

Author

Alley, Karen E., Scambos, Ted A., and Alley, Richard B.

Subjects
ICE shelves, ANTARCTIC ice, SEAWATER, STRUCTURAL stability, MELTING, MELTWATER
Abstract

Basal channels, which form where buoyant plumes of ocean water and meltwater carve troughs upwards into ice-shelf bases, are widespread on Antarctic ice shelves. The formation of these features modulates ice-shelf basal melt by influencing the flow of buoyant plumes, and influences structural stability through concentration of strain and interactions with fractures. Because of these effects, and because basal channels can change rapidly, on timescales similar to those of ice-shelf evolution, constraining the impacts of basal channels on ice shelves is necessary for predicting future ice-shelf destabilization and retreat. We suggest that future research priorities should include constraining patterns and rates of basal channel change, determining mechanisms and detailed patterns of basal melt, and quantifying the influence that channel-related fractures have on ice-shelf stability. [ABSTRACT FROM AUTHOR]

Published
2023
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3. GHOSTly flute music: drumlins, moats and the bed of Thwaites Glacier.

Author

Alley, Richard B., Holschuh, Nick, Parizek, Byron, Zoet, Lucas K., Riverman, Kiya, Muto, Atsuhiro, Christianson, Knut, Clyne, Elisabeth, Anandakrishnan, Sridhar, and Stevens, Nathan T.

Subjects
*ICE shelves, *FLUTE music, *DRUMLINS, *GLACIERS, *ABSOLUTE sea level change, *BEDROCK, *ALPINE glaciers, *TOPOGRAPHY, *ICE sheets
Abstract

Glacier-bed characteristics that are poorly known and modeled are important in projected sea-level rise from ice-sheet changes under strong warming, especially in the Thwaites Glacier drainage of West Antarctica. Ocean warming may induce ice-shelf thinning or loss, or thinning of ice in estuarine zones, reducing backstress on grounded ice. Models indicate that, in response, more-nearly-plastic beds favor faster ice loss by causing larger flow acceleration, but more-nearly-viscous beds favor localized near-coastal thinning that could speed grounding-zone retreat into interior basins where marine-ice-sheet instability or cliff instability could develop and cause very rapid ice loss. Interpretation of available data indicates that the bed is spatially mosaicked, with both viscous and plastic regions. Flow against bedrock topography removes plastic lubricating tills, exposing bedrock that is eroded on up-glacier sides of obstacles to form moats with exposed bedrock tails extending downglacier adjacent to lee-side soft-till bedforms. Flow against topography also generates high-ice-pressure zones that prevent inflow of lubricating water over distances that scale with the obstacle size. Extending existing observations to sufficiently large regions, and developing models assimilating such data at the appropriate scale, present large, important research challenges that must be met to reliably project future forced sea-level rise. [ABSTRACT FROM AUTHOR]

Published
2022
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