| DOI: | 10.1002/2015GL064844
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| 论文题名: | Widespread excess ice in Arcadia Planitia, Mars |
| 作者: | Bramson A.M.; Byrne S.; Putzig N.E.; Sutton S.; Plaut J.J.; Brothers T.C.; Holt J.W.
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| 刊名: | Geophysical Research Letters
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| ISSN: | 0094-9314
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| EISSN: | 1944-9045
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| 出版年: | 2015
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| 卷: | 42, 期:16 | | 起始页码: | 6566
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| 结束页码: | 6574
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| 语种: | 英语
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| 英文关键词: | digital terrain models
; layered subsurface
; Mars midlatitude ice
; spacecraft observations
; subsurface radar
; terraced craters
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| Scopus关键词: | Climate models
; Interfaces (materials)
; Permittivity
; Radar
; Radar measurement
; Radar reflection
; Dielectric interface
; Dielectric mixing model
; Digital terrain model
; Layered subsurface
; Long-term preservation
; Midlatitudes
; Terraced craters
; Volumetric concentrations
; Ice
; climate modeling
; crater
; long-term change
; Mars
; paleoclimate
; radar
; spacecraft
; subsurface flow
; terrain
; Arcadia [Peloponnisos]
; Greece
; Peloponnisos
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| 英文摘要: | The distribution of subsurface water ice on Mars is a key constraint on past climate, while the volumetric concentration of buried ice (pore-filling versus excess) provides information about the process that led to its deposition. We investigate the subsurface of Arcadia Planitia by measuring the depth of terraces in simple impact craters and mapping a widespread subsurface reflection in radar sounding data. Assuming that the contrast in material strengths responsible for the terracing is the same dielectric interface that causes the radar reflection, we can combine these data to estimate the dielectric constant of the overlying material. We compare these results to a three-component dielectric mixing model to constrain composition. Our results indicate a widespread, decameters-thick layer that is excess water ice ∼104 km3 in volume. The accumulation and long-term preservation of this ice is a challenge for current Martian climate models. © 2015. American Geophysical Union. All Rights Reserved. |
| URL: | https://www.scopus.com/inward/record.uri?eid=2-s2.0-84941741165&doi=10.1002%2f2015GL064844&partnerID=40&md5=05fba41f531e36e055173c34dce66adb
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| Citation statistics: |
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| 资源类型: | 期刊论文
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| 标识符: | http://119.78.100.158/handle/2HF3EXSE/8929
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| Appears in Collections: | 科学计划与规划
气候变化与战略
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作者单位: | Lunar and Planetary Laboratory, University of Arizona, Tucson, AR, United States
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| Recommended Citation: | |
Bramson A.M.,Byrne S.,Putzig N.E.,et al. Widespread excess ice in Arcadia Planitia, Mars[J]. Geophysical Research Letters,2015-01-01,42(16).
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