دورية أكاديمية
Organic Input to Titan's Subsurface Ocean Through Impact Cratering.
| العنوان: | Organic Input to Titan's Subsurface Ocean Through Impact Cratering. |
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| المؤلفون: | Neish C; Department of Earth Sciences, The University of Western Ontario, London, Ontario, Canada., Malaska MJ; Jet Propulsion Laboratory, California Institute of Technology, Pasadena, California, USA., Sotin C; Laboratoire de Planétologie et Géosciences, Nantes Université, Univ Angers, Le Mans Université, CNRS, UMR 6112, Nantes, France., Lopes RMC; Jet Propulsion Laboratory, California Institute of Technology, Pasadena, California, USA., Nixon CA; Planetary Systems Laboratory, NASA Goddard Space Flight Center, Greenbelt, Maryland, USA., Affholder A; Department of Ecology and Evolutionary Biology, The University of Arizona, Tucson, Arizona, USA., Chatain A; Departamento de Física Aplicada, Escuela de Ingeniería de Bilbao, Universidad del País Vasco/Euskal Herriko Unibertsitatea (UPV/EHU), Bilbao, Spain., Cockell C; UK Centre for Astrobiology, School of Physics and Astronomy, University of Edinburgh, Edinburgh, United Kingdom., Farnsworth KK; NASA Postdoctoral Program Fellow, NASA Goddard Space Flight Center, Greenbelt, Maryland, USA., Higgins PM; Department of Earth Sciences, University of Toronto, Toronto, Ontario, Canada., Miller KE; Southwest Research Institute, San Antonio, Texas, USA., Soderlund KM; Institute for Geophysics, Jackson School of Geosciences, The University of Texas at Austin, Austin, Texas, USA. |
| المصدر: | Astrobiology [Astrobiology] 2024 Feb; Vol. 24 (2), pp. 177-189. Date of Electronic Publication: 2024 Feb 02. |
| نوع المنشور: | Journal Article |
| اللغة: | English |
| بيانات الدورية: | Publisher: Mary Ann Liebert, Inc Country of Publication: United States NLM ID: 101088083 Publication Model: Print-Electronic Cited Medium: Internet ISSN: 1557-8070 (Electronic) Linking ISSN: 15578070 NLM ISO Abbreviation: Astrobiology Subsets: MEDLINE |
| أسماء مطبوعة: | Original Publication: Larchmont, N.Y. : Mary Ann Liebert, Inc., c2001- |
| مواضيع طبية MeSH: | Extraterrestrial Environment* , Saturn*, Water ; Solar System ; Glycine ; Oceans and Seas ; Atmosphere |
| مستخلص: | Titan has an organic-rich atmosphere and surface with a subsurface liquid water ocean that may represent a habitable environment. In this work, we determined the amount of organic material that can be delivered from Titan's surface to its ocean through impact cratering. We assumed that Titan's craters produce impact melt deposits composed of liquid water that can founder in its lower-density ice crust and estimated the amount of organic molecules that could be incorporated into these melt lenses. We used known yields for HCN and Titan haze hydrolysis to determine the amount of glycine produced in the melt lenses and found a range of possible flux rates of glycine from the surface to the subsurface ocean. These ranged from 0 to 10 11 mol/Gyr for HCN hydrolysis and from 0 to 10 14 mol/Gyr for haze hydrolysis. These fluxes suggest an upper limit for biomass productivity of ∼10 3 kgC/year from a glycine fermentation metabolism. This upper limit is significantly less than recent estimates of the hypothetical biomass production supported by Enceladus's subsurface ocean. Unless biologically available compounds can be sourced from Titan's interior, or be delivered from the surface by other mechanisms, our calculations suggest that even the most organic-rich ocean world in the Solar System may not be able to support a large biosphere. |
| فهرسة مساهمة: | Keywords: Habitability; Impact processes; Titan |
| المشرفين على المادة: | 059QF0KO0R (Water) TE7660XO1C (Glycine) |
| تواريخ الأحداث: | Date Created: 20240202 Date Completed: 20240226 Latest Revision: 20240226 |
| رمز التحديث: | 20240226 |
| DOI: | 10.1089/ast.2023.0055 |
| PMID: | 38306187 |
| قاعدة البيانات: | MEDLINE |
| تدمد: | 1557-8070 |
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| DOI: | 10.1089/ast.2023.0055 |