3D MORPHOMETRIES OF ESKERS ON MARS, AND COMPARISONS TO ESKERS IN FINLAND
International audience Introduction: We present new, high-resolution measurements of the 3D morphometries of eskers associated with debris-covered glaciers in the Phlegra Mon-tes [1] and NW Tempe Terra [2] regions of Mars' northern mid-latitudes. We compare them with the ancient south polar ...
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ftunivnantes:oai:HAL:hal-02396706v1 2023-11-12T04:18:53+01:00 3D MORPHOMETRIES OF ESKERS ON MARS, AND COMPARISONS TO ESKERS IN FINLAND Butcher, F., E G Balme, M. Gallagher, C. Storrar, R, D Conway, Susan J. Arnold, N, S Lewis, S. Hagermann, A. School of Physical Sciences Milton Keynes Faculty of Science, Technology, Engineering and Mathematics Milton Keynes The Open University Milton Keynes (OU)-The Open University Milton Keynes (OU) Open University UCD School of Geography, UCD Earth Institute, University College University College Dublin Dublin (UCD) Laboratoire de Planétologie et Géodynamique UMR 6112 (LPG) Université d'Angers (UA)-Université de Nantes - UFR des Sciences et des Techniques (UN UFR ST) Université de Nantes (UN)-Université de Nantes (UN)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS) The Open University Milton Keynes (OU) The Woodlands, Texas, United States 2019-03 https://hal.science/hal-02396706 en eng HAL CCSD hal-02396706 https://hal.science/hal-02396706 50th Lunar and Planetary Science Conference https://hal.science/hal-02396706 50th Lunar and Planetary Science Conference, Mar 2019, The Woodlands, Texas, United States [SDU.STU.PL]Sciences of the Universe [physics]/Earth Sciences/Planetology [SDU.STU.GL]Sciences of the Universe [physics]/Earth Sciences/Glaciology info:eu-repo/semantics/conferenceObject Conference papers 2019 ftunivnantes 2023-10-31T23:43:48Z International audience Introduction: We present new, high-resolution measurements of the 3D morphometries of eskers associated with debris-covered glaciers in the Phlegra Mon-tes [1] and NW Tempe Terra [2] regions of Mars' northern mid-latitudes. We compare them with the ancient south polar 'Dorsa Argentea' eskers on Mars [3], and first large database (n > 20,000) of 3D morphome-tries of terrestrial eskers, from SW Finland [4]. Eskers are ridges of glaciofluvial sediment deposited by meltwater flowing through tunnels within or beneath glaciers. They are vital tools for reconstructing the dynamics, extent, and environmental drivers of wet-based glaciation on Earth and Mars. For example, reconstructions of Mars' climate conditions at the Noa-chian-Hesperian transition [e.g., 5] have relied heavily upon insights from the Dorsa Argentea eskers [e.g., 3], which record basal melting of a large south polar ice sheet ~3.5 Ga. Morphometric studies of candidate eskers on Mars are vital both for testing hypotheses of their origins as eskers [e.g., 3], and for informing insights into the magnitude and dynamics of meltwater flows that formed them [e.g., 5-6]. Previously, such work has been limited by a lack of large-scale surveys of the 3D morphometries of eskers on Earth, to which the martian landforms can be compared. A new database comprising >20 000 measurements of 3D esker morphometries from SW Finland provides new opportunities for such-comparisons, which we exploit in this study [4]. Methods: We used 1-2 m/pixel digital elevation models generated from High Resolution Imaging Science Experiment (HiRISE) images to measure esker heights (H) and widths (W) from cross-sectional tran-sects spaced at 10 and 20 m intervals along the Phlegra Montes and NW Tempe Terra eskers, respectively (fol-lowing [3]). We calculated average slopes across cross-sectional transects (θ) as: tan −1 (H/0.5W). We classified transects into sharp-, multi-, and round-crested morphologies according to the scheme of [6]. The NW Tempe Terra ... Conference Object Ice Sheet Université de Nantes: HAL-UNIV-NANTES |
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Open Polar |
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Université de Nantes: HAL-UNIV-NANTES |
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ftunivnantes |
language |
English |
topic |
[SDU.STU.PL]Sciences of the Universe [physics]/Earth Sciences/Planetology [SDU.STU.GL]Sciences of the Universe [physics]/Earth Sciences/Glaciology |
spellingShingle |
[SDU.STU.PL]Sciences of the Universe [physics]/Earth Sciences/Planetology [SDU.STU.GL]Sciences of the Universe [physics]/Earth Sciences/Glaciology Butcher, F., E G Balme, M. Gallagher, C. Storrar, R, D Conway, Susan J. Arnold, N, S Lewis, S. Hagermann, A. 3D MORPHOMETRIES OF ESKERS ON MARS, AND COMPARISONS TO ESKERS IN FINLAND |
topic_facet |
[SDU.STU.PL]Sciences of the Universe [physics]/Earth Sciences/Planetology [SDU.STU.GL]Sciences of the Universe [physics]/Earth Sciences/Glaciology |
description |
International audience Introduction: We present new, high-resolution measurements of the 3D morphometries of eskers associated with debris-covered glaciers in the Phlegra Mon-tes [1] and NW Tempe Terra [2] regions of Mars' northern mid-latitudes. We compare them with the ancient south polar 'Dorsa Argentea' eskers on Mars [3], and first large database (n > 20,000) of 3D morphome-tries of terrestrial eskers, from SW Finland [4]. Eskers are ridges of glaciofluvial sediment deposited by meltwater flowing through tunnels within or beneath glaciers. They are vital tools for reconstructing the dynamics, extent, and environmental drivers of wet-based glaciation on Earth and Mars. For example, reconstructions of Mars' climate conditions at the Noa-chian-Hesperian transition [e.g., 5] have relied heavily upon insights from the Dorsa Argentea eskers [e.g., 3], which record basal melting of a large south polar ice sheet ~3.5 Ga. Morphometric studies of candidate eskers on Mars are vital both for testing hypotheses of their origins as eskers [e.g., 3], and for informing insights into the magnitude and dynamics of meltwater flows that formed them [e.g., 5-6]. Previously, such work has been limited by a lack of large-scale surveys of the 3D morphometries of eskers on Earth, to which the martian landforms can be compared. A new database comprising >20 000 measurements of 3D esker morphometries from SW Finland provides new opportunities for such-comparisons, which we exploit in this study [4]. Methods: We used 1-2 m/pixel digital elevation models generated from High Resolution Imaging Science Experiment (HiRISE) images to measure esker heights (H) and widths (W) from cross-sectional tran-sects spaced at 10 and 20 m intervals along the Phlegra Montes and NW Tempe Terra eskers, respectively (fol-lowing [3]). We calculated average slopes across cross-sectional transects (θ) as: tan −1 (H/0.5W). We classified transects into sharp-, multi-, and round-crested morphologies according to the scheme of [6]. The NW Tempe Terra ... |
author2 |
School of Physical Sciences Milton Keynes Faculty of Science, Technology, Engineering and Mathematics Milton Keynes The Open University Milton Keynes (OU)-The Open University Milton Keynes (OU) Open University UCD School of Geography, UCD Earth Institute, University College University College Dublin Dublin (UCD) Laboratoire de Planétologie et Géodynamique UMR 6112 (LPG) Université d'Angers (UA)-Université de Nantes - UFR des Sciences et des Techniques (UN UFR ST) Université de Nantes (UN)-Université de Nantes (UN)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS) The Open University Milton Keynes (OU) |
format |
Conference Object |
author |
Butcher, F., E G Balme, M. Gallagher, C. Storrar, R, D Conway, Susan J. Arnold, N, S Lewis, S. Hagermann, A. |
author_facet |
Butcher, F., E G Balme, M. Gallagher, C. Storrar, R, D Conway, Susan J. Arnold, N, S Lewis, S. Hagermann, A. |
author_sort |
Butcher, F., E G |
title |
3D MORPHOMETRIES OF ESKERS ON MARS, AND COMPARISONS TO ESKERS IN FINLAND |
title_short |
3D MORPHOMETRIES OF ESKERS ON MARS, AND COMPARISONS TO ESKERS IN FINLAND |
title_full |
3D MORPHOMETRIES OF ESKERS ON MARS, AND COMPARISONS TO ESKERS IN FINLAND |
title_fullStr |
3D MORPHOMETRIES OF ESKERS ON MARS, AND COMPARISONS TO ESKERS IN FINLAND |
title_full_unstemmed |
3D MORPHOMETRIES OF ESKERS ON MARS, AND COMPARISONS TO ESKERS IN FINLAND |
title_sort |
3d morphometries of eskers on mars, and comparisons to eskers in finland |
publisher |
HAL CCSD |
publishDate |
2019 |
url |
https://hal.science/hal-02396706 |
op_coverage |
The Woodlands, Texas, United States |
genre |
Ice Sheet |
genre_facet |
Ice Sheet |
op_source |
50th Lunar and Planetary Science Conference https://hal.science/hal-02396706 50th Lunar and Planetary Science Conference, Mar 2019, The Woodlands, Texas, United States |
op_relation |
hal-02396706 https://hal.science/hal-02396706 |
_version_ |
1782335411914276864 |