DOI: 10.1016/j.epsl.2017.11.028
Scopus记录号: 2-s2.0-85035150691
论文题名: Assessing the potential for measuring Europa's tidal Love number h2 using radar sounder and topographic imager data
作者: Steinbrügge G. ; Schroeder D.M. ; Haynes M.S. ; Hussmann H. ; Grima C. ; Blankenship D.D.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2018
卷: 482 起始页码: 334
结束页码: 341
语种: 英语
英文关键词: Europa
; h2
; radar altimetry
; solid body tides
Scopus关键词: Budget control
; Quality control
; Radar
; Radar imaging
; Radio links
; Stereo image processing
; Digital terrain model
; Doppler information
; Europa
; Geophysical measurements
; Radar altimetry
; Range measurements
; Solid bodies
; Sub-surface ocean
; Radar measurement
; accuracy assessment
; computer simulation
; digital terrain model
; Doppler radar
; error analysis
; Europa
; radar altimetry
; stereo image
; topography
英文摘要: The tidal Love number h2 is a key geophysical measurement for the characterization of Europa's interior, especially of its outer ice shell if a subsurface ocean is present. We performed numerical simulations to assess the potential for estimating h2 using altimetric measurements with a combination of radar sounding and stereo imaging data. The measurement principle exploits both delay and Doppler information in the radar surface return in combination with topography from a digital terrain model (DTM). The resulting radar range measurements at cross-over locations can be used in combination with radio science Doppler data for an improved trajectory solution and for estimating the h2 Love number. Our simulation results suggest that the absolute accuracy of h2 from the joint analysis of REASON (Radar for Europa Assessment and Sounding: Ocean to Near-surface) surface return and EIS (Europa Imaging System) DTM data will be in the range of 0.04–0.17 assuming full radio link coverage. The error is controlled by the SNR budget and DTM quality, both dependent on the surface properties of Europa. We estimate that this would unambiguously confirm (or reject) the global ocean hypothesis and, in combination with a nominal radio-science based measurement of the tidal Love number k2, constrain the thickness of Europa's outer ice shell to up to ±15 km. © 2017 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/110118
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: German Aerospace Center, Institute of Planetary Research, Berlin, Germany; Department of Geophysics, Stanford University, Stanford, CA, United States; Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA, United States; Institute for Geophysics, University of Texas at Austin, Austin, TX, United States
Recommended Citation:
Steinbrügge G.,Schroeder D.M.,Haynes M.S.,et al. Assessing the potential for measuring Europa's tidal Love number h2 using radar sounder and topographic imager data[J]. Earth and Planetary Science Letters,2018-01-01,482