Subscribe to our free daily newsletters
. 24/7 Space News .




Subscribe to our free daily newsletters



The Carbon Versus Water Battle Goes Hemispherical

File Image: MOLA points the way
Pasadena - Mar 21, 2002
When astronauts finally land on Mars, a safe bet is that they'll head for northern climes if they intend to spend much time there. That's because nearly all the available water is frozen as ice at the north pole. Planetary scientists have been aware of this for some time, but they now have a new clue why it is so.

In the March 21 issue of the journal Nature, California Institute of Technology researcher Mark Richardson and his colleague John Wilson of the National Oceanic and Atmospheric Administration reveal that the higher average elevation of the Red Planet's southern hemisphere ultimately tends to drive water northward.

Their evidence is based on a computer model the two have worked on for years (Wilson since 1992, Richardson since 1996), coupled with data returned by NASA's Mars Global Surveyor.

"We've found a mechanism in the Martian climate that introduces annual average hemispheric asymmetry," explains Richardson, an assistant professor of planetary science at Caltech. "The circulation systems of Mars and Earth are similar in certain ways, but Mars is different in that water is not available everywhere."

The key to understanding the phenomenon is a complicated computer modeling of the Hadley circulation, which extends about 40 degrees of latitude each side of the Martian equator. A topographical bias in circulation pretty much means there will be a bias in the net pole-to-pole transport of water, Richardson explains.

A plausible explanation is that water ice is found at the north pole and carbon dioxide ice is found at the south for reasons having to do with the way the sun heats the atmosphere.

As the Martian orbit changes on time scales of 50,000 years and more, these effects tend to cancel, with no pole claiming the water ice cap over geological time. It has been suggested that topography determines where carbon dioxide forms, and hence, where water ice can form, but the processes controlling carbon dioxide ice caps are poorly understood.

However, the mechanism Richardson and Wilson describe is independent of this occasional realignment of the pole's precession and the planet's eccentric orbit. The mechanism means that, while there is never a time in the past when water ice can be discounted at the south pole, one is more likely to find it more frequently at the north pole.

The importance of the study is its furthering of our understanding of the Martian climate and Martian water cycle. A better understanding of how water is transported will be particularly important to determining whether life once existed on Mars, and what happened to it if it ever did.

Related Links
More on this report at Nature
The Division of Geological and Planetary Sciences at Caltech
SpaceDaily
Search SpaceDaily
Subscribe To SpaceDaily Express

Support For Critical Role Of Carbon Dioxide On Mars Grows
 Washington - Mar 13, 2002
Scientists have provided new evidence that liquid carbon dioxide, not running water, may have been the primary cause of erosional features such as gullies, valley networks, and channels that cover the surface of Mars.



Thanks for being here;
We need your help. The SpaceDaily news network continues to grow but revenues have never been harder to maintain.

With the rise of Ad Blockers, and Facebook - our traditional revenue sources via quality network advertising continues to decline. And unlike so many other news sites, we don't have a paywall - with those annoying usernames and passwords.

Our news coverage takes time and effort to publish 365 days a year.

If you find our news sites informative and useful then please consider becoming a regular supporter or for now make a one off contribution.

SpaceDaily Contributor
$5 Billed Once


credit card or paypal
SpaceDaily Monthly Supporter
$5 Billed Monthly


paypal only






Memory Foam Mattress Review
Newsletters :: SpaceDaily :: SpaceWar :: TerraDaily :: Energy Daily
XML Feeds :: Space News :: Earth News :: War News :: Solar Energy News








The content herein, unless otherwise known to be public domain, are Copyright 1995-2016 - Space Media Network. All websites are published in Australia and are solely subject to Australian law and governed by Fair Use principals for news reporting and research purposes. AFP, UPI and IANS news wire stories are copyright Agence France-Presse, United Press International and Indo-Asia News Service. ESA news reports are copyright European Space Agency. All NASA sourced material is public domain. Additional copyrights may apply in whole or part to other bona fide parties. Advertising does not imply endorsement, agreement or approval of any opinions, statements or information provided by Space Media Network on any Web page published or hosted by Space Media Network. Privacy Statement All images and articles appearing on Space Media Network have been edited or digitally altered in some way. Any requests to remove copyright material will be acted upon in a timely and appropriate manner. Any attempt to extort money from Space Media Network will be ignored and reported to Australian Law Enforcement Agencies as a potential case of financial fraud involving the use of a telephonic carriage device or postal service.