Polygonal frost patterned ground as a Mars analogue in Northern Victoria Land, Antarctica
Polygonal patterned ground is ubiquitous in the martian mid-latitudes and in the polar regions of Earth. The latitude dependence of martian patterned ground and its morphological similarity to terrestrial patterned ground suggests that thermal contraction cracking may have been the leading formation...
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ftunivpisairis:oai:arpi.unipi.it:11568/1104205 2024-04-14T08:02:52+00:00 Polygonal frost patterned ground as a Mars analogue in Northern Victoria Land, Antarctica Sassenroth, Cynthia Hauber, Ernst Baroni, Carlo Salvatore, Maria Cristina De Vera, Jean-Pierre Schmitz, Nicole EGU (European Geoscience Union) Sassenroth, Cynthia Hauber, Ernst Baroni, Carlo Salvatore, Maria Cristina De Vera, Jean-Pierre Schmitz, Nicole 2021 ELETTRONICO http://hdl.handle.net/11568/1104205 https://doi.org/10.5194/egusphere-egu21-12265 https://meetingorganizer.copernicus.org/EGU21/session/40278 eng eng Copernicus country:DEU ispartofbook:EGU General Assembly 2021 EGU General Assembly 2021 volume:1 issue:1 firstpage:1 lastpage:1 numberofpages:1 alleditors:EGU (European Geoscience Union) http://hdl.handle.net/11568/1104205 doi:10.5194/egusphere-egu21-12265 https://meetingorganizer.copernicus.org/EGU21/session/40278 Polygonal frost patterned ground Mar Northern Victoria Land Antarctica info:eu-repo/semantics/conferenceObject 2021 ftunivpisairis https://doi.org/10.5194/egusphere-egu21-12265 2024-03-21T19:21:41Z Polygonal patterned ground is ubiquitous in the martian mid-latitudes and in the polar regions of Earth. The latitude dependence of martian patterned ground and its morphological similarity to terrestrial patterned ground suggests that thermal contraction cracking may have been the leading formation mechanism for those polygons. Due to a lack of ground truthing on martian patterned ground, the role of liquid water in its formation and weather freeze-thaw processes lead to their origin is still debated. This study uses a quantitative approach, based on geomorphometrical and soil characteristics of patterned ground in continental Antarctica and glacial deposits with low inclination of Terra Nova Bay as terrestrial analogues, to understand polygon formation in martian hyper-arid conditions. We investigated polygons in ice-free parts of the mountain range of Helliwell Hills (~71°43S / 161°2E) in continental Antarctica and the Northern Foothills in the coastal Terra Nova Bay area (74°45S / 164°E). Field observations were made during the austral summer on the GANOVEX XI and GANOVEX XIII expeditions in Dec-Jan 2015/2016 and Oct-Nov 2018, respectively. The polygonal troughs have been mapped and digitized in ArcGIS based on high resolution satellite images. For Helliwell Hills we used World View 2 images with a pixel size of 50 cm. For Terra Nova Bay, Quickbird satellite imagery has been used with a pixel size of 60 cm. Based on these datasets, parameters such as area, perimeter, length, and width have been measured, and size, circularity, orientation, and aspect ratio of each polygon were derived from these measurements. Additionally, we used a DTM derived from World View 2 stereo imagery (ground sampling distance: 8 m) to calculate the average slope, aspect, and solar irradiation of each polygon. The quantitative analysis shows that the geomorphometric characteristics of polygons in the Helliwell Hills differ significantly from those in Terra Nova Bay. Polygons in the Helliwell Hills are significantly smaller than in ... Conference Object Antarc* Antarctica Victoria Land ARPI - Archivio della Ricerca dell'Università di Pisa Austral Helliwell Hills ENVELOPE(161.200,161.200,-71.833,-71.833) Northern Foothills ENVELOPE(163.917,163.917,-74.733,-74.733) Terra Nova Bay Victoria Land |
institution |
Open Polar |
collection |
ARPI - Archivio della Ricerca dell'Università di Pisa |
op_collection_id |
ftunivpisairis |
language |
English |
topic |
Polygonal frost patterned ground Mar Northern Victoria Land Antarctica |
spellingShingle |
Polygonal frost patterned ground Mar Northern Victoria Land Antarctica Sassenroth, Cynthia Hauber, Ernst Baroni, Carlo Salvatore, Maria Cristina De Vera, Jean-Pierre Schmitz, Nicole Polygonal frost patterned ground as a Mars analogue in Northern Victoria Land, Antarctica |
topic_facet |
Polygonal frost patterned ground Mar Northern Victoria Land Antarctica |
description |
Polygonal patterned ground is ubiquitous in the martian mid-latitudes and in the polar regions of Earth. The latitude dependence of martian patterned ground and its morphological similarity to terrestrial patterned ground suggests that thermal contraction cracking may have been the leading formation mechanism for those polygons. Due to a lack of ground truthing on martian patterned ground, the role of liquid water in its formation and weather freeze-thaw processes lead to their origin is still debated. This study uses a quantitative approach, based on geomorphometrical and soil characteristics of patterned ground in continental Antarctica and glacial deposits with low inclination of Terra Nova Bay as terrestrial analogues, to understand polygon formation in martian hyper-arid conditions. We investigated polygons in ice-free parts of the mountain range of Helliwell Hills (~71°43S / 161°2E) in continental Antarctica and the Northern Foothills in the coastal Terra Nova Bay area (74°45S / 164°E). Field observations were made during the austral summer on the GANOVEX XI and GANOVEX XIII expeditions in Dec-Jan 2015/2016 and Oct-Nov 2018, respectively. The polygonal troughs have been mapped and digitized in ArcGIS based on high resolution satellite images. For Helliwell Hills we used World View 2 images with a pixel size of 50 cm. For Terra Nova Bay, Quickbird satellite imagery has been used with a pixel size of 60 cm. Based on these datasets, parameters such as area, perimeter, length, and width have been measured, and size, circularity, orientation, and aspect ratio of each polygon were derived from these measurements. Additionally, we used a DTM derived from World View 2 stereo imagery (ground sampling distance: 8 m) to calculate the average slope, aspect, and solar irradiation of each polygon. The quantitative analysis shows that the geomorphometric characteristics of polygons in the Helliwell Hills differ significantly from those in Terra Nova Bay. Polygons in the Helliwell Hills are significantly smaller than in ... |
author2 |
EGU (European Geoscience Union) Sassenroth, Cynthia Hauber, Ernst Baroni, Carlo Salvatore, Maria Cristina De Vera, Jean-Pierre Schmitz, Nicole |
format |
Conference Object |
author |
Sassenroth, Cynthia Hauber, Ernst Baroni, Carlo Salvatore, Maria Cristina De Vera, Jean-Pierre Schmitz, Nicole |
author_facet |
Sassenroth, Cynthia Hauber, Ernst Baroni, Carlo Salvatore, Maria Cristina De Vera, Jean-Pierre Schmitz, Nicole |
author_sort |
Sassenroth, Cynthia |
title |
Polygonal frost patterned ground as a Mars analogue in Northern Victoria Land, Antarctica |
title_short |
Polygonal frost patterned ground as a Mars analogue in Northern Victoria Land, Antarctica |
title_full |
Polygonal frost patterned ground as a Mars analogue in Northern Victoria Land, Antarctica |
title_fullStr |
Polygonal frost patterned ground as a Mars analogue in Northern Victoria Land, Antarctica |
title_full_unstemmed |
Polygonal frost patterned ground as a Mars analogue in Northern Victoria Land, Antarctica |
title_sort |
polygonal frost patterned ground as a mars analogue in northern victoria land, antarctica |
publisher |
Copernicus |
publishDate |
2021 |
url |
http://hdl.handle.net/11568/1104205 https://doi.org/10.5194/egusphere-egu21-12265 https://meetingorganizer.copernicus.org/EGU21/session/40278 |
long_lat |
ENVELOPE(161.200,161.200,-71.833,-71.833) ENVELOPE(163.917,163.917,-74.733,-74.733) |
geographic |
Austral Helliwell Hills Northern Foothills Terra Nova Bay Victoria Land |
geographic_facet |
Austral Helliwell Hills Northern Foothills Terra Nova Bay Victoria Land |
genre |
Antarc* Antarctica Victoria Land |
genre_facet |
Antarc* Antarctica Victoria Land |
op_relation |
ispartofbook:EGU General Assembly 2021 EGU General Assembly 2021 volume:1 issue:1 firstpage:1 lastpage:1 numberofpages:1 alleditors:EGU (European Geoscience Union) http://hdl.handle.net/11568/1104205 doi:10.5194/egusphere-egu21-12265 https://meetingorganizer.copernicus.org/EGU21/session/40278 |
op_doi |
https://doi.org/10.5194/egusphere-egu21-12265 |
_version_ |
1796318085998706688 |