In a new study, scientists from the CSIC-INTA Astrobiology Centre in Madrid have confirmed that the type of mineralogical composition on the surface of Mars influences the measuring of its temperature.
The study will be used to interpret the data from the soil temperature sensor of NASA’s Mars Science Laboratory (MSL) vehicle, whose launch is envisaged for 2011.
“We have confirmed, by means of infrared spectroscopy tests, that the chemical-mineralogical associations on the surface of Mars influence the measuring of the temperature of the Martian soil,” explained Maria Paz Martin, a researcher at the Astrobiology Centre, and the main author of the study.
The infrared spectrometers register how the different mixtures of minerals reflect this type of radiation and this information is used to calculate the environmental temperature.
The work lies within the framework of a project related to the soil temperature sensor of the REMS weather station (Rover Environmental Monitoring Station).
This instrument, whose design is coordinated by the CAB, forms part of the Mars Science Laboratory (MSL) vehicle and mission, which NASA intended to launch this year but has now put off until 2011.
“This research shows that, in order to carry out the thermal measurements on the surface of Mars, we must bear in mind certain specific mineralogical mixtures”, Martin indicated.
The results confirm that there exist significant increases and falls of up to 100 percent in the percentages of the reflectance values (the capacity of reflection of a surface) in mixtures such as those of basalt with hematite in comparison with those of basalt with magnetite.
To carry out the study, the scientists have selected and prepared samples of terrestrial minerals which are known to exist on Mars, such as oxides, oxi-hydroxides, sulphates, chlorides, opal and others which come from clay.
These compounds were obtained from reference materials from the United States Geological Survey, as well as from different areas of the Earth similar to those of the red planet, like El Jaroso (Almería), the Tinto River (Huelva) and Atacama Desert (Chile).
The researchers pulverised the material until they achieved fewer than 45 microns, the average size of the dust of the Martian soil.
They then mixed the minerals in different proportions with basalt, the most important volcanic rock on Mars, and measured how the infrared reflectance varied at the same wavelength levels as those at which the REMS temperature sensor will operate.
“The experiments confirm that any chemical-mineralogical analytical development on Mars requires the prior satisfactory quality of the methodological tests and routines on Earth,” said Martin.