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Post Info TOPIC: Martian north pole


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Title: Geologic map of the north polar region of Mars
Authors: Kenneth L. Tanaka and Corey M. Fortezzo

The north polar region of Mars occurs within the central and lowest part of the vast northern plains of Mars and is dominated by the roughly circular north polar plateau, Planum Boreum. The northern plains formed very early in Martian time and have collected volcanic flows and sedimentary materials shed from highland sources. Planum Boreum has resulted from the accumulation of water ice and dust particles. Extensive, uncratered dune fields adjacent to Planum Boreum attest to the active and recent transport and accumulation of sand. Our geologic map of Planum Boreum is the first to record its entire observable stratigraphic record using the various post-Viking image and topography datasets released before 2009.

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Polar Cliffs and Falling Blocks

ESP_027451_2635.jpg

There is an ice sheet at the North Pole of Mars that is a few miles thick at its center. At some places (like in this image) it ends in steep cliffs that can be about 800 meters high.
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Mars' northern polar regions

518-20110707-8160-6-co-1-North_IceCap_L.jpg

A newly released image from ESA's Mars Express shows the north pole of Mars during the red planet's summer solstice. All the carbon dioxide ice has gone, leaving just a bright cap of water ice.
 This image was captured by the orbiter's High-Resolution Stereo Camera on 17 May 2010 and shows part of the northern polar region of Mars during the summer solstice. The solstice is the longest day and the beginning of the summer for the planet's northern hemisphere.

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NASA Orbiter Penetrates Mysteries of Martian Ice Cap

Data from NASA's Mars Reconnaissance Orbiter have helped scientists solve a pair of mysteries dating back four decades and provided new information about climate change on the Red Planet.
The Shallow Radar, or SHARAD, instrument aboard the Mars Reconnaissance Orbiter revealed subsurface geology allowing scientists to reconstruct the formation of a large chasm and a series of spiral troughs on the northern ice cap of Mars. The findings appear in two papers in the May 27 issue of the journal Nature.

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Planetary scientists solve 40-year-old mysteries of Mars' northern ice cap

Scientists have reconstructed the formation of two curious features in the northern ice cap of Mars - a chasm larger than the Grand Canyon and a series of spiral troughs - solving a pair of mysteries dating back four decades while finding new evidence of climate change on Mars.
In a pair of papers to be published in the journal Nature on May 27, Jack Holt and Isaac Smith of The University of Texas at Austin's Institute for Geophysics and their colleagues describe how they used radar data collected by NASA's Mars Reconnaissance Orbiter to reveal the subsurface geology of the red planet's northern ice cap.

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Radar Map of Buried Mars Layers Matches Climate Cycles
New, three-dimensional imaging of Martian north-polar ice layers by a radar instrument on NASA's Mars Reconnaissance Orbiter is consistent with theoretical models of Martian climate swings during the past few million years.
Alignment of the layering patterns with the modelled climate cycles provides insight about how the layers accumulated. These ice-rich, layered deposits cover an area one-third larger than Texas and form a stack up to 2 kilometres  thick atop a basal deposit with additional ice.

"The radar has been giving us spectacular results. We have mapped continuous underground layers in three dimensions across a vast area" - Jeffrey Plaut of JPL, a member of the science team for the Shallow Radar instrument.

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Ice-covered martian North Pole
Rupes Tenuis
Rupes Tenuis

ESA's Mars Express orbiter imaged the snow-laden region of Rupes Tenuis on the martian north pole on 29 July 2008.
The images are centred around 81° north and 297° east and have a ground resolution of 41 m/pixel. They cover an area of about 44 000 km², almost as large as the Netherlands.

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Martian ice cap
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A large ice cap found at Mars' northern pole is "of a very high degree of purity," according to an international study reported on Tuesday by French researchers.
Radar data sent back by the US Mars Reconnaissance Orbiter (MRO) point to 95 percent purity in this deposit, France's National Institute of Sciences of the Universe (Insu) said in a press release.
The Martian polar regions are believed to hold the equivalent of two to three million cubic kilometres of ice.
The study appears in the journal Geophysical Research Letters, published by the American Geophysical Union.


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Mars north pole
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De la glace très pure sous la calotte polaire nord de Mars
Une équipe internationale, dirigée par des chercheurs du laboratoire de planétologie de Grenoble (UMR : CNRS-INSU, Université Joseph Fourier) vient d'obtenir des résultats concernant la calotte polaire nord de Mars. Utilisant les données du radar de Mars Reconnaissance Orbiter de la NASA, ces astrophysiciens viennent de confirmer la grande abondance de l'eau martienne sous forme de glace, mais aussi son très haut degré de pureté (95%), avec une concentration des impuretés à la périphérie de la calotte polaire. Ces résultats constituent des éléments importants pour développer une planétologie comparée entre calottes martiennes et terrestres. Ces travaux sont publiés dans la revue Geophysical Research Letters.

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Huge Meteor Crater Found Underneath Martian Ice
New images taken by NASA's Mars Reconnaissance Orbiter have revealed rare evidence of an impact crater in Mars' north polar region.
Around the red planet's north pole is a feature called the north polar layered deposits, which are a series of ice-rich layers deposited over time and up to several kilometres thick.

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