DOI: 10.1002/2014GL059475
论文题名: Laboratory measurements of cryogenic liquid alkane microwave absorptivity and implications for the composition of Ligeia Mare, Titan
作者: Mitchell K.L. ; Barmatz M.B. ; Jamieson C.S. ; Lorenz R.D. ; Lunine J.I.
刊名: Geophysical Research Letters
ISSN: 0094-8895
EISSN: 1944-8626
出版年: 2015
卷: 42, 期: 5 起始页码: 1340
结束页码: 1345
语种: 英语
英文关键词: composition
; liquid alkanes
; loss tangent
; microwave
; seas
; Titan
Scopus关键词: Chemical analysis
; Dielectric liquids
; Ethane
; Gas hydrates
; Liquid methane
; Microwaves
; Paraffins
; Radar
; Radar measurement
; Remote sensing
; Clathrate hydrate
; Complex dielectric constant
; Laboratory measurements
; Liquid alkanes
; Loss tangent
; Microwave absorptivity
; seas
; Titan
; Liquids
; absorption
; cryogenic fluid
; dielectric property
; ethane
; frequency-magnitude distribution
; laboratory method
; methane
; microwave radiation
; radar
; remote sensing
; satellite altimetry
; Great Lakes [North America]
; Lake Ontario
英文摘要: The complex dielectric constants of liquids methane and ethane were measured at 90 K and 14.1 GHz, close to the frequency of the Cassini RADAR. The liquid ethane loss tangent is far greater than that of liquid methane, facilitating discrimination by remote sensing. The results suggest a methane-dominated composition for the northern sea, Ligeia Mare, on the basis of a recent loss tangent determination using Cassini RADAR altimetry. This contrasts a previous far higher loss tangent for the southern lake, Ontario Lacus, which is inconsistent with simple mixtures of methane and ethane. The apparent nonequilibrium methane-to-ethane ratio of Ligeia Mare can be explained by poor admixture of periodically cycled methane with a deeper ethane-rich alkanofer system, consistent with obliquity-driven volatile cycling, sequestration of ethane from the hydrocarbon cycle by incorporation into crustal clathrate hydrates, or periodic flushing of Ligeia Mare into adjacent Kraken Mare by fresh rainfall. © 2015. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84925714473&doi=10.1002%2f2014GL059475&partnerID=40&md5=d8a410ad03d0b025c671e38b1038e5ac
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/8511
Appears in Collections: 科学计划与规划 气候变化与战略
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作者单位: Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA, United States
Recommended Citation:
Mitchell K.L.,Barmatz M.B.,Jamieson C.S.,et al. Laboratory measurements of cryogenic liquid alkane microwave absorptivity and implications for the composition of Ligeia Mare, Titan[J]. Geophysical Research Letters,2015-01-01,42(5).