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Your search keyword '"Gallagher, Colman"' showing total 13 results
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13 results on '"Gallagher, Colman"'

2. Contributors

Author

Ahrens, Caitlin J., primary, Bierson, Carver J., additional, Brough, Stephen, additional, Butcher, Frances E.G., additional, Castillo-Rogez, Julie, additional, Conway, S.J., additional, Costard, F., additional, Dhingra, R.D., additional, El-Maarry, Mohamed Ramy, additional, Farnsworth, K.K., additional, Gallagher, Colman, additional, Galofre, Anna Grau, additional, Garvin, James B., additional, Godin, E., additional, Hepburn, Adam J., additional, Howell, Samuel M., additional, Hubbard, Bryn, additional, Kalousová, Klára, additional, Keown, Lauren E. Mc, additional, Koutnik, Michelle, additional, Landis, Margaret E., additional, Lasue, Jeremie, additional, Leonard, Erin, additional, Lisse, Carey M., additional, Magaña, L.O., additional, Nathan, E.M., additional, Pathare, Asmin, additional, Philippe, M., additional, Rubanenko, Lior, additional, Scanlon, Kat, additional, Soare, Richard J., additional, Steinbrügge, Gregor, additional, Stillman, D., additional, Williams, Jean-Pierre, additional, and Wolfenbarger, Natalie, additional

Published
2024
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4. Evidence, arguments, and cold-climate geomorphology that favour periglacial cycling at the Martian mid-to-high latitudes in the Late Amazonian Epoch

Author

Soare, Richard J., primary, Costard, F., additional, Williams, Jean-Pierre, additional, Gallagher, Colman, additional, Hepburn, Adam J., additional, Stillman, D., additional, Koutnik, Michelle, additional, Conway, S.J., additional, Philippe, M., additional, Butcher, Frances E.G., additional, Mc Keown, Lauren E., additional, and Godin, E., additional

Published
2024
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10. Eskers associated with buried glaciers in Mars' mid latitudes: recent advances and future directions

Author

Butcher, Frances E.G., Arnold, Neil S., Balme, Matthew R., Conway, Susan J., Clark, Christopher D., Gallagher, Colman, Hagermann, Axel, Lewis, Stephen R., Rutledge, Alicia M., Storrar, Robert D., Woodley, Savana Z., Butcher, Frances E.G., Arnold, Neil S., Balme, Matthew R., Conway, Susan J., Clark, Christopher D., Gallagher, Colman, Hagermann, Axel, Lewis, Stephen R., Rutledge, Alicia M., Storrar, Robert D., and Woodley, Savana Z.

Abstract

Until recently, the influence of basal liquid water on the evolution of buried glaciers in Mars' mid latitudes was assumed to be negligible because the latter stages of Mars' Amazonian period (3 Ga to present) have long been thought to have been similarly cold and dry to today. Recent identifications of several landforms interpreted as eskers associated with these young (100s Ma) glaciers calls this assumption into doubt. They indicate basal melting (at least locally and transiently) of their parent glaciers. Although rare, they demonstrate a more complex mid-to-late Amazonian environment than was previously understood. Here, we discuss several open questions posed by the existence of glacier-linked eskers on Mars, including on their global-scale abundance and distribution, the drivers and dynamics of melting and drainage, and the fate of meltwater upon reaching the ice margin. Such questions provide rich opportunities for collaboration between the Mars and Earth cryosphere research communities., Funder: French Space Agency CNES; STFC (ST/V50693X/1); NASA (80NSSC21K0908); UK Space Agency (ST/R001405/1, ST/T002913/1, ST/V005332/1, ST/W002744/1, ST/W002949/1)

Published
2023
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11. Eskers associated with buried glaciers in Mars' mid latitudes: recent advances and future directions.

Author

Butcher, Frances E. G., Arnold, Neil S., Balme, Matthew R., Conway, Susan J., Clark, Christopher D., Gallagher, Colman, Hagermann, Axel, Lewis, Stephen R., Rutledge, Alicia M., Storrar, Robert D., and Woodley, Savana Z.

Subjects
GLACIERS, MELTWATER, MARS (Planet), SCIENTIFIC community, LATITUDE, LANDFORMS, CRYOSPHERE
Abstract

Until recently, the influence of basal liquid water on the evolution of buried glaciers in Mars' mid latitudes was assumed to be negligible because the latter stages of Mars' Amazonian period (3 Ga to present) have long been thought to have been similarly cold and dry to today. Recent identifications of several landforms interpreted as eskers associated with these young (100s Ma) glaciers calls this assumption into doubt. They indicate basal melting (at least locally and transiently) of their parent glaciers. Although rare, they demonstrate a more complex mid-to-late Amazonian environment than was previously understood. Here, we discuss several open questions posed by the existence of glacier-linked eskers on Mars, including on their global-scale abundance and distribution, the drivers and dynamics of melting and drainage, and the fate of meltwater upon reaching the ice margin. Such questions provide rich opportunities for collaboration between the Mars and Earth cryosphere research communities. [ABSTRACT FROM AUTHOR]

Published
2023
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12. Eskers associated with buried glaciers in Mars' mid latitudes: recent advances and future directions

Author

Butcher, Frances E. G., primary, Arnold, Neil S., additional, Balme, Matthew R., additional, Conway, Susan J., additional, Clark, Christopher D., additional, Gallagher, Colman, additional, Hagermann, Axel, additional, Lewis, Stephen R., additional, Rutledge, Alicia M., additional, Storrar, Robert D., additional, and Woodley, Savana Z., additional

Published
2022
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13. Surface topographic impact of subglacial water beneath the south polar ice cap of Mars

Author

Arnold, Neil, Butcher, Frances, Conway, Susan, Gallagher, Colman, Balme, Matthew, Arnold, Neil [0000-0001-7538-3999], and Apollo - University of Cambridge Repository

Subjects
5101 Astronomical Sciences, 5109 Space Sciences, 51 Physical Sciences, 5107 Particle and High Energy Physics
Abstract

Bright radar reflections observed at the Ultimi Scopuli region of Mars’ south polar layered deposits (SPLD) by the Mars Advanced Radar for Subsurface and Ionosphere Sounding (MARSIS) instrument have been interpreted as the signature of areas of subglacial water beneath it. However, other studies put forward alternative explanations that do not imply the presence of liquid water. Here we shed light on the issue by looking at the surface topography of the region. On Earth, reduced or absent basal friction, and consequent ice velocity changes, cause a distinct topographic signature over subglacial lakes. Using Mars Orbiter Laser Altimeter |(MOLA) data, we identify and characterise an anomaly in the surface topography of the SPLD overlying the area of the putative lakes, similar to those found above terrestrial subglacial lakes of similar size. Ice flow model results suggest comparable topographic anomalies form within 0.5 – 1.5 Myr with locally elevated geothermal heating or 2 – 5 Myr without elevated geothermal heating. These findings offer independent support for the presence of basal water beneath Ultimi Scopuli and suggest surface topography could supplement radar returns to help identify other potential subglacial water bodies.

Published
2022

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