globalchange  > 影响、适应和脆弱性
DOI: 10.1016/j.epsl.2018.05.046
Scopus记录号: 2-s2.0-85048576228
论文题名:
Mars obliquity history constrained by elliptic crater orientations
作者: Holo S.J.; Kite E.S.; Robbins S.J.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2018
卷: 496
起始页码: 206
结束页码: 214
语种: 英语
英文关键词: elliptic craters ; Mars ; obliquity history
Scopus关键词: Aquifers ; Hydrogeology ; Ice control ; Direct simulation ; elliptic craters ; Elliptical craters ; Forward modeling ; Mars ; Preferred orientations ; Probability density function (pdf) ; Simulation prediction ; Probability density function ; climate ; computer simulation ; crater ; ellipse ; ensemble forecasting ; Mars ; Martian atmosphere ; probability density function ; Hesperia
英文摘要: The dynamics of Mars’ obliquity are believed to be chaotic, and the historical ∼3.5 Gyr (late-Hesperian onward) obliquity probability density function (PDF) is highly uncertain and cannot be inferred from direct simulation alone. Obliquity is also a strong control on post-Noachian Martian climate, enhancing the potential for equatorial ice/snow melting and runoff at high obliquities (≳40°) and enhancing the potential for desiccation of deep aquifers at low obliquities (≲25°). We developed a new technique using the orientations of elliptical craters to constrain the true late-Hesperian-onward obliquity PDF. To do so, we developed a forward model of the effect of obliquity on elliptic crater orientations using ensembles of simulated Mars impactors and ∼3.5 Gyr-long Mars obliquity simulations. In our model, the inclinations and speeds of Mars crossing objects bias the preferred orientation of elliptic craters which are formed by low-angle impacts. Comparison of our simulation predictions with a validated database of elliptic crater orientations allowed us to invert for the best-fitting obliquity history. We found that since the onset of the late Hesperian, Mars’ mean obliquity was likely low, between ∼10° and ∼30° and the fraction of time spent at high obliquities >40° was likely <20%. © 2018 Elsevier B.V.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/109808
Appears in Collections:影响、适应和脆弱性
气候变化事实与影响

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作者单位: University of Chicago, Department of Geophysical Sciences, Chicago, IL 60637, United States; Southwest Research Institute, Boulder, CO 80302, United States

Recommended Citation:
Holo S.J.,Kite E.S.,Robbins S.J.. Mars obliquity history constrained by elliptic crater orientations[J]. Earth and Planetary Science Letters,2018-01-01,496
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