Martian weather satellite's first report

October 13, 2008
Martian weather satellite's first report
NASA's Mars Reconnaissance Orbiter over the Martian pole.

(PhysOrg.com) -- Scientists now have a ‘Martian weather satellite’ to observe the weather on Mars in the same way as they monitor Earth’s weather. Its first ‘weather report’ has been given by a team including Oxford University scientists.

NASA’s Mars Reconnaissance Orbiter went into orbit around the Red Planet two years ago but the first results from its observations are published in Nature Geoscience this week. And they reveal a surprise: during the freezing Martian winter the atmosphere above the planet’s South Pole is considerably warmer than predicted.

The Mars Climate Sounder instrument has enabled an international team, including scientists from Oxford University, to examine the Martian atmosphere in unprecedented detail. Studying the Martian climate is important as it helps us understand how a planet that was originally similar to Earth turned out so very different.

‘It has taken 20 years and three missions but we finally have an instrument in orbit that gives us a detailed view of the entire atmosphere of Mars and it is already giving us fresh insights into the Martian climate,’ said Professor Fred Taylor of Oxford’s Department of Physics, corresponding author of the paper and part of the team that built the Mars Climate Sounder.

The team discovered that even in the depths of the Martian winter, when the planet’s South Pole is frozen and in total darkness, at an altitude of 30-80km the atmosphere is being heated to 180 Kelvin - that’s 10-20 Kelvin warmer than expected.

‘Winter at the Martian South Pole is severe even by the standards of our Antarctic,’ said Professor Taylor. ‘The Pole is shrouded in total darkness for many months and the carbon dioxide in the atmosphere freezes, creating blizzards and causing a thick layer of carbon dioxide ice to form across the surface. Yet what we’ve found is that 30 kilometres above the surface conditions are very different.’

The team, which also included Oxford physicists Dr Pat Irwin and Dr Simon Calcutt, believe that a vigorous circulation of the atmosphere – from the Martian equator to the Pole – is compressing the gas and causing the heating effect.

‘It’s the same effect that warms the cylinder of a bicycle pump, or the pistons of a car engine, when you compress the gas inside,’ said Professor Taylor. ‘What we think we are observing is that the ‘engine’ of the Martian climate – this atmospheric circulation – is running as much as 50 per cent faster than our models predicted, resulting in this warming of the South Pole.’

These are just the first results from what the scientists hope will be many more years of study. In the long-term they hope to shed light on climate change on Mars, what controls it and what lessons can be drawn for climate change on Earth.

The team conducting the research included Professor Fred Taylor, Dr Pat Irwin and Dr Simon Calcutt of the University of Oxford’s Department of Physics, as well as scientists from the Open University, the California Institute of Technology, Pasadena (USA), Cornell University, New York (USA), University of California, Los Angeles (USA) and University of Washington, Seattle (USA).

A report of the research, entitled ‘Intense polar temperature inversion in the middle atmosphere on Mars’, is published in Nature Geoscience on 12 October 2008.

Provided by Oxford University

Explore further: New MAVEN findings reveal how Mars' atmosphere was lost to space

Related Stories

Martian winds carve mountains, move dust, raise dust

February 28, 2017

On Mars, wind rules. Wind has been shaping the Red Planet's landscapes for billions of years and continues to do so today. Studies using both a NASA orbiter and a rover reveal its effects on scales grand to tiny on the strangely ...

NASA Mars orbiter tracks back-to-back regional storms

March 10, 2017

A regional dust storm currently swelling on Mars follows unusually closely on one that blossomed less than two weeks earlier and is now dissipating, as seen in daily global weather monitoring by NASA's Mars Reconnaissance ...

Recommended for you

Swarm explores a new feature of the northern lights

April 21, 2017

Thanks to social media and the power of citizen scientists chasing the northern lights, a new feature was discovered recently. Nobody knew what this strange ribbon of purple light was, so … it was called Steve.

Detecting life in the ultra-dry Atacama Desert

April 21, 2017

Few places are as hostile to life as Chile's Atacama Desert. It's the driest non-polar desert on Earth, and only the hardiest microbes survive there. Its rocky landscape has lain undisturbed for eons, exposed to extreme temperatures ...

New look at 2004's martian hole-in-one site

April 21, 2017

A new observation from NASA's Mars Reconnaissance Orbiter (MRO) captures the landing platform that the rover Opportunity left behind in Eagle Crater more than 13 years and 27 miles (or 44 kilometers) ago.

0 comments

Please sign in to add a comment. Registration is free, and takes less than a minute. Read more

Click here to reset your password.
Sign in to get notified via email when new comments are made.