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題名 Grid Mapping the Northern Plains of Mars: Geomorphological, Radar, and Water-Equivalent Hydrogen Results From Arcadia Plantia 作者 范噶色
Gasselt, Stephan van
Ramsdale, Jason D.
Eke, Vince R.
Johnsson, Andreas
Kereszturi, Akos
Losiak, Anna
Massey, Richard J.
Platz, Thomas
Reiss, Dennis
Skinner, James A.
;Swirad, Zuzanna M.
Balme, Matthew R.
Teodoro, Luis F. A.
Wilson, Jack T.
Gallagher, Colman
Susan貢獻者 地政系 日期 2019-02 上傳時間 27-Apr-2020 15:57:23 (UTC+8) 摘要 A project of mapping ice-related landforms was undertaken to understand the role of subsurface ice in the northern plains. This work is the first continuous regional mapping from CTX (ConTeXt Camera, 6 m/pixel; Malin et al.,) imagery in Arcadia Planitia along a strip 300 km across stretching from 30°N to 80°N centered on the 170°W line of longitude. The distribution and morphotypes of these landforms were used to understand the permafrost cryolithology. The mantled and textured signatures occur almost ubiquitously between 35°N and 78°N and have a positive spatial correlation with inferred ice stability based on thermal modeling, neutron spectroscopy, and radar data. The degradational features into the LDM (latitude-dependent mantle) include pits, scallops, and 100-m polygons and provide supporting evidence for subsurface ice and volatile loss between 35 and 70°N in Arcadia with the mantle between 70 and 78°N appearing much more intact. Pitted terrain appears to be much more pervasive in Arcadia than in Acidalia and Utopia suggesting that the Arcadia study area had more widespread near-surface subsurface ice and thus was more susceptible to pitting or that the ice was less well buried by sediments. Correlations with ice stability models suggest that lack of pits north of 65–70°N could indicate a relatively young age (~1 Ma); however, this could also be explained through regional variations in degradation rates. The deposition of the LDM is consistent with an air fall hypothesis; however, there appears to be substantial evidence for fluvial processes in southern Arcadia with older, underlying processes being equally dominant with the LDM and degradation thereof in shaping the landscape. 關聯 Journal of Geophysical Research, Vol.124, No.2, pp.504-527 資料類型 article DOI https://doi.org/10.1029/2018JE005663 dc.contributor 地政系 dc.creator (作者) 范噶色 dc.creator (作者) Gasselt, Stephan van dc.creator (作者) Ramsdale, Jason D. dc.creator (作者) Eke, Vince R. dc.creator (作者) Johnsson, Andreas dc.creator (作者) Kereszturi, Akos dc.creator (作者) Losiak, Anna dc.creator (作者) Massey, Richard J. dc.creator (作者) Platz, Thomas dc.creator (作者) Reiss, Dennis dc.creator (作者) Skinner, James A. dc.creator (作者) ;Swirad, Zuzanna M. dc.creator (作者) Balme, Matthew R. dc.creator (作者) Teodoro, Luis F. A. dc.creator (作者) Wilson, Jack T. dc.creator (作者) Gallagher, Colman dc.creator (作者) Susan dc.date (日期) 2019-02 dc.date.accessioned 27-Apr-2020 15:57:23 (UTC+8) - dc.date.available 27-Apr-2020 15:57:23 (UTC+8) - dc.date.issued (上傳時間) 27-Apr-2020 15:57:23 (UTC+8) - dc.identifier.uri (URI) http://nccur.lib.nccu.edu.tw/handle/140.119/129492 - dc.description.abstract (摘要) A project of mapping ice-related landforms was undertaken to understand the role of subsurface ice in the northern plains. This work is the first continuous regional mapping from CTX (ConTeXt Camera, 6 m/pixel; Malin et al.,) imagery in Arcadia Planitia along a strip 300 km across stretching from 30°N to 80°N centered on the 170°W line of longitude. The distribution and morphotypes of these landforms were used to understand the permafrost cryolithology. The mantled and textured signatures occur almost ubiquitously between 35°N and 78°N and have a positive spatial correlation with inferred ice stability based on thermal modeling, neutron spectroscopy, and radar data. The degradational features into the LDM (latitude-dependent mantle) include pits, scallops, and 100-m polygons and provide supporting evidence for subsurface ice and volatile loss between 35 and 70°N in Arcadia with the mantle between 70 and 78°N appearing much more intact. Pitted terrain appears to be much more pervasive in Arcadia than in Acidalia and Utopia suggesting that the Arcadia study area had more widespread near-surface subsurface ice and thus was more susceptible to pitting or that the ice was less well buried by sediments. Correlations with ice stability models suggest that lack of pits north of 65–70°N could indicate a relatively young age (~1 Ma); however, this could also be explained through regional variations in degradation rates. The deposition of the LDM is consistent with an air fall hypothesis; however, there appears to be substantial evidence for fluvial processes in southern Arcadia with older, underlying processes being equally dominant with the LDM and degradation thereof in shaping the landscape. dc.format.extent 132 bytes - dc.format.mimetype text/html - dc.relation (關聯) Journal of Geophysical Research, Vol.124, No.2, pp.504-527 dc.title (題名) Grid Mapping the Northern Plains of Mars: Geomorphological, Radar, and Water-Equivalent Hydrogen Results From Arcadia Plantia dc.type (資料類型) article dc.identifier.doi (DOI) 10.1029/2018JE005663 dc.doi.uri (DOI) https://doi.org/10.1029/2018JE005663
