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Estimation of ice and liquid water on martian analogue soils at temperatures below 0°C by means of dielectric spectroscopy

Lorek, Andreas and Wagner, Norman and deVera, Jean Pierre (2011) Estimation of ice and liquid water on martian analogue soils at temperatures below 0°C by means of dielectric spectroscopy. In: Tagungsband: 71. Jahrestagung der Deutschen Geophysikalischen Gesellschaft vom 21.–24. Februar 2011 in Köln, p. 147. 71. Jahrestagung der Deutschen Geophysikalischen Gesellschaft, 21.-24.02.2011, Köln, Deutschland.

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Official URL: http://www.dgg-online.de/tagungen/DGG-2011-komprimiert.pdf

Abstract

Recent Mars observations and experimental investigations indicate that water could be a key factor of current physical and chemical processes on the martian surface, e.g. rheological phenomena. Therefore it is of particular interest to get information about the liquid like state of water on martian analog soils in the temperature range below 0 ◦C. In this context, a plate capacitor has been developed to obtain isothermal dielectric spectra of fine grained soils in the frequency range from 10 Hz to 1.1 MHz at martian like temperatures down to -70 °C. Two martian analogue soils have been investigated: a Ca-Bentonit (specific surface of 215 m2/g, up to 9.4 %w/w gravimetric water content) and JSC Mars 1, a volcanic ash (specific surface of 146 m2/g, up to 7.4 %w/w). Three soil-specific relaxation processes are observed in the investigated frequency-temperature range: two weak high frequency processes (bound or confined water as well as ice) and a strong low frequency process due to counter ion relaxation and the Maxwell-Wagner effect. The real part of effective complex soil permittivity at 350 kHz was used to determine ice and liquid like water content by means of the Birchak or CRIM equation. There are evidence that bentonite down to -70 °C has a liquid like water content of 1.3 mono layers and JSC Mars 1 a liquid like water content of 2.3 mono layers.

Document Type:Conference or Workshop Item (Other, Poster)
Title:Estimation of ice and liquid water on martian analogue soils at temperatures below 0°C by means of dielectric spectroscopy
Authors:
AuthorsInstitution or Email of Authors
Lorek, Andreasandreas.lorek@dlr.de
Wagner, Normannorman.wagner@mfpa.de
deVera, Jean Pierrejean-pierre.devera@dlr.de
Date:22 February 2011
Journal or Publication Title:Tagungsband: 71. Jahrestagung der Deutschen Geophysikalischen Gesellschaft vom 21.–24. Februar 2011 in Köln
Refereed publication:No
In SCOPUS:No
In ISI Web of Science:No
Page Range:p. 147
Editors:
EditorsEmail
UNSPECIFIEDDeutsche Geophysikalische Gesellschaft e.V.
Status:Published
Keywords:water, ice, Mars, permittivity, JSC Mars 1, Bentonite, interfacial water, mono layer
Event Title:71. Jahrestagung der Deutschen Geophysikalischen Gesellschaft
Event Location:Köln, Deutschland
Event Type:international Conference
Event Dates:21.-24.02.2011
Organizer:Deutsche Geophysikalische Gesellschaft e.V.
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Space (old)
HGF - Program Themes:W EW - Erforschung des Weltraums
DLR - Research area:Space
DLR - Program:W EW - Erforschung des Weltraums
DLR - Research theme (Project):W - Projekt ExoMars (old)
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Planetary Research > Terahertz and Infrared Sensors
Deposited By: Dr.rer.nat. Andreas Lorek
Deposited On:29 Jun 2011 13:05
Last Modified:29 Jun 2011 13:05

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