Subsurface
Deep-UV spectroscopy
Enceladus
Europa
Fluorescence mapping
Organic detection
Titan. Astrobiology 20, 1185–1211
Journal
Astrobiology
ISSN: 1557-8070
Titre abrégé: Astrobiology
Pays: United States
ID NLM: 101088083
Informations de publication
Date de publication:
10 2020
10 2020
Historique:
pubmed:
24
7
2020
medline:
22
9
2021
entrez:
24
7
2020
Statut:
ppublish
Résumé
We used a deep-ultraviolet fluorescence mapping spectrometer, coupled to a drill system, to scan from the surface to 105 m depth into the Greenland ice sheet. The scan included firn and glacial ice and demonstrated that the instrument is able to determine small (mm) and large (cm) scale regions of organic matter concentration and discriminate spectral types of organic matter at high resolution. Both a linear point cloud scanning mode and a raster mapping mode were used to detect and localize microbial and organic matter "hotspots" embedded in the ice. Our instrument revealed diverse spectral signatures. Most hotspots were <20 mm in diameter, clearly isolated from other hotspots, and distributed stochastically; there was no evidence of layering in the ice at the fine scales examined (100 μm per pixel). The spectral signatures were consistent with organic matter fluorescence from microbes, lignins, fused-ring aromatic molecules, including polycyclic aromatic hydrocarbons, and biologically derived materials such as fulvic acids.
Identifiants
pubmed: 32700965
doi: 10.1089/ast.2020.2241
pmc: PMC7591382
doi:
Types de publication
Journal Article
Research Support, U.S. Gov't, Non-P.H.S.
Langues
eng
Sous-ensembles de citation
IM
Pagination
1185-1211Références
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