DOI: 10.1016/j.epsl.2018.05.033
Scopus记录号: 2-s2.0-85047723881
论文题名: Cassini radar observation of Punga Mare and environs: Bathymetry and composition
作者: Mastrogiuseppe M. ; Poggiali V. ; Hayes A.G. ; Lunine J.I. ; Seu R. ; Di Achille G. ; Lorenz R.D.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2018
卷: 496 起始页码: 89
结束页码: 95
语种: 英语
英文关键词: altimetry
; bathymetry
; planets
; radar
; sounder
; Titan
Scopus关键词: Bathymetry
; Ethane
; Liquid methane
; Liquids
; Planets
; Radar
; altimetry
; Atmospheric process
; Best-fit solutions
; Liquid compositions
; Processing technique
; Relative reduction
; sounder
; Titan
; Radar measurement
; altimetry
; bathymetry
; methane
; Moon
; nitrogen
; observational method
; planet
; radar
英文摘要: In January 2015 (fly-by T108), the Cassini radar observed Punga Mare, Titan's northernmost and third-largest sea, in altimetry mode during closest approach. The ground track intercepted a section of the mare and a system of channels and flooded areas connecting Punga to Kraken Mare. We use a processing technique, successfully adopted for Ligeia Mare and Ontario Lacus, for detecting echoes from the sea floor and constraining the depth and composition of these liquid bodies. We find that, along the radar transect, Punga Mare has a maximum measured depth of 110 m. The relative reduction in backscatter of the seafloor, as a function of increasing depth, suggests a liquid loss tangent of 3±1×10−5. While this value is within the formal uncertainty of the loss tangent derived for Ligeia Mare, the best-fit solution is lower and is consistent with a nearly pure binary methane-nitrogen liquid with little to no ethane or higher order components. The indication of very low amounts of ethane toward the pole suggests that atmospheric processes are controlling the surface liquid composition of Titan's seas. © 2018 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/109804
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 Rome “La Sapienza”, Via Eudossiana 18, Rome, 00184, Italy; Department of Astronomy, Cornell University, Ithaca, NY 14853, United States; INAF National Institute for Astrophysics, Astronomical Observatory of Abruzzo, Teramo, Italy; Johns Hopkins University, Applied Physics Laboratory, Johns Hopkins Road, Laurel, MD 11100, United States
Recommended Citation:
Mastrogiuseppe M.,Poggiali V.,Hayes A.G.,et al. Cassini radar observation of Punga Mare and environs: Bathymetry and composition[J]. Earth and Planetary Science Letters,2018-01-01,496