DOI: 10.1029/2017JE005501
Scopus记录号: 2-s2.0-85047832428
论文题名: The Thermophysical Properties of the Bagnold Dunes, Mars: Ground-Truthing Orbital Data
作者: Edwards C.S. ; Piqueux S. ; Hamilton V.E. ; Fergason R.L. ; Herkenhoff K.E. ; Vasavada A.R. ; Bennett K.A. ; Sacks L. ; Lewis K. ; Smith M.D.
刊名: Journal of Geophysical Research: Planets
ISSN: 21699097
出版年: 2018
卷: 123, 期: 5 起始页码: 1307
结束页码: 1326
语种: 英语
英文关键词: Bagnold dunes
; Mars Science Laboratory
; particle size
; Thermal Emission Imaging System
; thermal inertia
Scopus关键词: dune
; imaging method
; inertia
; Mars
; particle size
; physical property
; thermal regime
英文摘要: We compare the thermophysical properties and particle sizes derived from the Mars Science Laboratory rover's Ground Temperature Sensor of the Bagnold dunes, specifically Namib dune, to those derived orbitally from Thermal Emission Imaging System, ultimately linking these measurements to ground truth particle sizes determined from Mars Hand Lens Imager images. In general, we find that all three datasets report consistent particle sizes for the Bagnold dunes (~110–350 μm and are within measurement and model uncertainties), indicating that particle sizes of homogeneous materials inferred from temperature measurements and thermophysical models are reliable. Furthermore, we examine the effects of two physical characteristics that could influence the modeled thermal inertia and particle sizes, including (1) fine-scale (centimeter to meter scale) ripples and (2) thin layering of indurated/armored materials. To first order, we find that small-scale ripples and thin (approximately centimeter scale) layers do not significantly affect the determination of bulk thermal inertia from orbital thermal data using a single nighttime temperature. Modeling of a layer of coarse or indurated material reveals that a thin layer (< ~5 mm; similar to what was observed by the Curiosity rover) would not significantly change the observed thermal properties of the surface and would be dominated by the properties of the underlying material. Thermal inertia and particle sizes of relatively homogeneous materials derived from nighttime orbital data should be considered as reliable, as long as there are no significant subpixel anisothermality effects (e.g., lateral mixing of multiple thermophysically distinct materials). ©2018. American Geophysical Union. All Rights Reserved.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/113990
Appears in Collections: 气候减缓与适应
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作者单位: Department of Physics and Astronomy, Northern Arizona University, Flagstaff, AZ, United States; Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA, United States; Southwest Research Institute, Boulder, CO, United States; Astrogeology Science Center, U.S. Geological Survey, Flagstaff, AZ, United States; Department of Earth and Planetary Sciences, The Johns Hopkins University, Baltimore, MD, United States; NASA Goddard Space Flight Center, Greenbelt, MD, United States
Recommended Citation:
Edwards C.S.,Piqueux S.,Hamilton V.E.,et al. The Thermophysical Properties of the Bagnold Dunes, Mars: Ground-Truthing Orbital Data[J]. Journal of Geophysical Research: Planets,2018-01-01,123(5)