Planet Four: Terrains - Discovery of Araneiforms Outside of the South Polar Layered Deposits
We present the results of a systematic mapping of seasonally sculpted terrains on the South Polar region of Mars with the Planet Four: Terrains (P4T) online citizen science project. P4T enlists members of the general public to visually identify features in the publicly released Mars Reconnaissance O...
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ftdatacite:10.48550/arxiv.1708.07858 2023-05-15T16:41:28+02:00 Planet Four: Terrains - Discovery of Araneiforms Outside of the South Polar Layered Deposits Schwamb, Megan E. Aye, Klaus-Michael Portyankina, Ganna Hansen, Candice J. Allen, Campbell Allen, Sarah Calef, Fred J. Duca, Simone McMaster, Adam Miller, Grant R. M. 2017 https://dx.doi.org/10.48550/arxiv.1708.07858 https://arxiv.org/abs/1708.07858 unknown arXiv https://dx.doi.org/10.1016/j.icarus.2017.06.017 arXiv.org perpetual, non-exclusive license http://arxiv.org/licenses/nonexclusive-distrib/1.0/ Earth and Planetary Astrophysics astro-ph.EP Instrumentation and Methods for Astrophysics astro-ph.IM FOS Physical sciences article-journal Article ScholarlyArticle Text 2017 ftdatacite https://doi.org/10.48550/arxiv.1708.07858 https://doi.org/10.1016/j.icarus.2017.06.017 2022-04-01T10:28:58Z We present the results of a systematic mapping of seasonally sculpted terrains on the South Polar region of Mars with the Planet Four: Terrains (P4T) online citizen science project. P4T enlists members of the general public to visually identify features in the publicly released Mars Reconnaissance Orbiter CTX images. In particular, P4T volunteers are asked to identify: 1) araneiforms (including features with a central pit and radiating channels known as 'spiders'); 2) erosional depressions, troughs, mesas, ridges, and quasi-circular pits characteristic of the South Polar Residual Cap (SPRC) which we collectively refer to as 'Swiss cheese terrain', and 3) craters. In this work we present the distributions of our high confidence classic spider araneiforms and Swiss cheese terrain identifications. We find no locations within our high confidence spider sample that also have confident Swiss cheese terrain identifications. Previously spiders were reported as being confined to the South Polar Layered Deposits (SPLD). Our work has provided the first identification of spiders at locations outside of the SPLD, confirmed with high resolution HiRISE imaging. We find araneiforms on the Amazonian and Hesperian polar units and the Early Noachian highland units, with 75% of the identified araneiform locations in our high confidence sample residing on the SPLD. With our current coverage, we cannot confirm whether these are the only geologic units conducive to araneiform formation on the Martian South Polar region. Our results are consistent with the current CO2 jet formation scenario with the process exploiting weaknesses in the surface below the seasonal CO2 ice sheet to carve araneiform channels into the regolith over many seasons. These new regions serve as additional probes of the conditions required for channel creation in the CO2 jet process. (Abridged) : accepted to Icarus - Supplemental data files are available at https://www.zooniverse.org/projects/mschwamb/planet-four-terrains/about/results - Icarus print version available at http://www.sciencedirect.com/science/article/pii/S0019103517300556 Text Ice Sheet DataCite Metadata Store (German National Library of Science and Technology) |
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Earth and Planetary Astrophysics astro-ph.EP Instrumentation and Methods for Astrophysics astro-ph.IM FOS Physical sciences |
spellingShingle |
Earth and Planetary Astrophysics astro-ph.EP Instrumentation and Methods for Astrophysics astro-ph.IM FOS Physical sciences Schwamb, Megan E. Aye, Klaus-Michael Portyankina, Ganna Hansen, Candice J. Allen, Campbell Allen, Sarah Calef, Fred J. Duca, Simone McMaster, Adam Miller, Grant R. M. Planet Four: Terrains - Discovery of Araneiforms Outside of the South Polar Layered Deposits |
topic_facet |
Earth and Planetary Astrophysics astro-ph.EP Instrumentation and Methods for Astrophysics astro-ph.IM FOS Physical sciences |
description |
We present the results of a systematic mapping of seasonally sculpted terrains on the South Polar region of Mars with the Planet Four: Terrains (P4T) online citizen science project. P4T enlists members of the general public to visually identify features in the publicly released Mars Reconnaissance Orbiter CTX images. In particular, P4T volunteers are asked to identify: 1) araneiforms (including features with a central pit and radiating channels known as 'spiders'); 2) erosional depressions, troughs, mesas, ridges, and quasi-circular pits characteristic of the South Polar Residual Cap (SPRC) which we collectively refer to as 'Swiss cheese terrain', and 3) craters. In this work we present the distributions of our high confidence classic spider araneiforms and Swiss cheese terrain identifications. We find no locations within our high confidence spider sample that also have confident Swiss cheese terrain identifications. Previously spiders were reported as being confined to the South Polar Layered Deposits (SPLD). Our work has provided the first identification of spiders at locations outside of the SPLD, confirmed with high resolution HiRISE imaging. We find araneiforms on the Amazonian and Hesperian polar units and the Early Noachian highland units, with 75% of the identified araneiform locations in our high confidence sample residing on the SPLD. With our current coverage, we cannot confirm whether these are the only geologic units conducive to araneiform formation on the Martian South Polar region. Our results are consistent with the current CO2 jet formation scenario with the process exploiting weaknesses in the surface below the seasonal CO2 ice sheet to carve araneiform channels into the regolith over many seasons. These new regions serve as additional probes of the conditions required for channel creation in the CO2 jet process. (Abridged) : accepted to Icarus - Supplemental data files are available at https://www.zooniverse.org/projects/mschwamb/planet-four-terrains/about/results - Icarus print version available at http://www.sciencedirect.com/science/article/pii/S0019103517300556 |
format |
Text |
author |
Schwamb, Megan E. Aye, Klaus-Michael Portyankina, Ganna Hansen, Candice J. Allen, Campbell Allen, Sarah Calef, Fred J. Duca, Simone McMaster, Adam Miller, Grant R. M. |
author_facet |
Schwamb, Megan E. Aye, Klaus-Michael Portyankina, Ganna Hansen, Candice J. Allen, Campbell Allen, Sarah Calef, Fred J. Duca, Simone McMaster, Adam Miller, Grant R. M. |
author_sort |
Schwamb, Megan E. |
title |
Planet Four: Terrains - Discovery of Araneiforms Outside of the South Polar Layered Deposits |
title_short |
Planet Four: Terrains - Discovery of Araneiforms Outside of the South Polar Layered Deposits |
title_full |
Planet Four: Terrains - Discovery of Araneiforms Outside of the South Polar Layered Deposits |
title_fullStr |
Planet Four: Terrains - Discovery of Araneiforms Outside of the South Polar Layered Deposits |
title_full_unstemmed |
Planet Four: Terrains - Discovery of Araneiforms Outside of the South Polar Layered Deposits |
title_sort |
planet four: terrains - discovery of araneiforms outside of the south polar layered deposits |
publisher |
arXiv |
publishDate |
2017 |
url |
https://dx.doi.org/10.48550/arxiv.1708.07858 https://arxiv.org/abs/1708.07858 |
genre |
Ice Sheet |
genre_facet |
Ice Sheet |
op_relation |
https://dx.doi.org/10.1016/j.icarus.2017.06.017 |
op_rights |
arXiv.org perpetual, non-exclusive license http://arxiv.org/licenses/nonexclusive-distrib/1.0/ |
op_doi |
https://doi.org/10.48550/arxiv.1708.07858 https://doi.org/10.1016/j.icarus.2017.06.017 |
_version_ |
1766031898330529792 |