دورية أكاديمية
أعرض في EDS

Using MARSIS signal attenuation to assess the presence of South Polar Layered Deposit subglacial brines.

التفاصيل البيبلوغرافية
العنوان: Using MARSIS signal attenuation to assess the presence of South Polar Layered Deposit subglacial brines.
المؤلفون: Lauro SE; Dipartimento di Matematica e Fisica, Università degli studi Roma Tre, Rome, Italy., Pettinelli E; Dipartimento di Matematica e Fisica, Università degli studi Roma Tre, Rome, Italy. elena.pettinelli@uniroma3.it., Caprarelli G; Centre for Astrophysics, Institute for Advanced Engineering and Space Sciences, University of Southern Queensland, Toowomba, QLD, Australia., Baniamerian J; Dipartimento di Matematica e Fisica, Università degli studi Roma Tre, Rome, Italy., Mattei E; Dipartimento di Matematica e Fisica, Università degli studi Roma Tre, Rome, Italy., Cosciotti B; Dipartimento di Matematica e Fisica, Università degli studi Roma Tre, Rome, Italy., Stillman DE; Department of Space Studies, Southwest Research Institute, Boulder, CO, USA., Primm KM; Planetary Science Institute, Tucson, AZ, USA., Soldovieri F; Istituto per il Rilevamento Elettromagnetico dell'Ambiente, Consiglio Nazionale delle Ricerche, Naples, Italy., Orosei R; Istituto di Radioastronomia (IRA), Istituto Nazionale di Astrofisica (INAF), Bologna, Italy.
المصدر: Nature communications [Nat Commun] 2022 Sep 28; Vol. 13 (1), pp. 5686. Date of Electronic Publication: 2022 Sep 28.
نوع المنشور: Journal Article
اللغة: English
بيانات الدورية: Publisher: Nature Pub. Group Country of Publication: England NLM ID: 101528555 Publication Model: Electronic Cited Medium: Internet ISSN: 2041-1723 (Electronic) Linking ISSN: 20411723 NLM ISO Abbreviation: Nat Commun Subsets: PubMed not MEDLINE; MEDLINE
أسماء مطبوعة: Original Publication: [London] : Nature Pub. Group
مستخلص: Knowledge of the physical and thermal properties of the South Polar Layer Deposits (SPLD) is key to constrain the source of bright basal reflections at Ultimi Scopuli detected by the MARSIS (Mars Advanced Radar for Subsurface and Ionosphere Sounding) radar sounder. Here we present a detailed analysis of attenuation, based on data acquired by MARSIS at 3, 4, and 5 MHz. We show that attenuation is frequency dependent, and that its behavior is consistent throughout the entire region. This suggests that the SPLD are compositionally homogeneous at Ultimi Scopuli, and our results are consistent with dust contents of 5 to 12%. Using these values as input, and plausible estimates of surface temperature and heat flux, we inferred basal temperatures around 200 K: these are consistent with perchlorate brines within liquid vein networks as the source of the reflections. Furthermore, extrapolation of the attenuation to higher frequencies explains why SHARAD (Shallow Radar) has thus far not detected basal reflections within the SPLD at Ultimi Scopuli.
(© 2022. The Author(s).)
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تواريخ الأحداث: Date Created: 20220928 Latest Revision: 20221001
رمز التحديث: 20231215
مُعرف محوري في PubMed: PMC9519933
DOI: 10.1038/s41467-022-33389-4
PMID: 36171186
قاعدة البيانات: MEDLINE
الوصف
تدمد:2041-1723
DOI:10.1038/s41467-022-33389-4