DOI: 10.1029/2017JE005462
Scopus记录号: 2-s2.0-85050396126
论文题名: The Surface Roughness of Large Craters on Mercury
作者: Susorney H.C.M. ; Barnouin O.S. ; Ernst C.M. ; Stickle A.M.
刊名: Journal of Geophysical Research: Planets
ISSN: 21699097
出版年: 2018
卷: 123, 期: 7 起始页码: 1581
结束页码: 1595
语种: 英语
英文关键词: impact craters
; Mercury
; surface roughness
英文摘要: This study investigates how individual large craters on Mercury (diameters of 25–200 km) can produce surface roughness over a range of baselines (the spatial horizontal scale) from 0.5 to 250 km. Surface roughness is a statistical measure of change in surface height over a baseline usually after topography has been detrended. We use root mean square deviation as our measure of surface roughness. Observations of large craters on Mercury at baselines of 0.5–10 km found higher surface roughness values at the central uplifts, rims, and exteriors of craters, while the crater floors exhibit the lowest roughness values. At baselines <10 km, the regions exterior to large craters with diameters >80 km have the highest surface roughness values. These regions, which include the ejecta and secondary fields, are the main contributors to the increased surface roughness observed in high-crater density regions. For baselines larger than 10 km, the crater cavity itself is the main contributor to surface roughness. We used a suite of numerical models, utilizing the measured surface roughness obtained in the study, to model the cumulative effect of adding large craters to a surface. The results indicate that not all of the surface roughness on Mercury is due to fresh large craters but that impact craters likely contribute to the Hurst exponent from baselines of 0.5–1.5 km and the shape of the deviogram. The simulations show that the surface roughness varied around an asymptote at the baselines studied before the surface was covered in impact craters. ©2018. American Geophysical Union. All Rights Reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/113579
Appears in Collections: 气候减缓与适应
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作者单位: Department of Earth and Planetary Science, The Johns Hopkins University, Baltimore, MD, United States; Department of Earth, Ocean and Atmospheric Sciences, University of British Columbia, Vancouver, BC, Canada; The Johns Hopkins University Applied Physics Laboratory, Laurel, MD, United States; Hopkins Extreme Material Institute, The Johns Hopkins University, Baltimore, MD, United States
Recommended Citation:
Susorney H.C.M.,Barnouin O.S.,Ernst C.M.,et al. The Surface Roughness of Large Craters on Mercury[J]. Journal of Geophysical Research: Planets,2018-01-01,123(7)