Antarctic research helps shed light on climate change on Mars

Aug 28, 2008

Researchers examining images of gullies on the flanks of craters on Mars say they formed as recently as a few hundred thousand years ago and in sites once occupied by glaciers. The features are eerily reminiscent of gullies formed in Antarctica's mars-like McMurdo Dry Valleys.

The parallels between the Martian gullies and those in Antarctica's McMurdo Dry Valleys were made using the latest high-resolution images and technology from satellites orbiting Mars to observe key details of their geological setting.

On Mars, the gullies appear to originate from cirque-like features high on pole-facing crater-interior walls, especially those within the Newton crater, 40°S, examined for the study. In addition to the cirque-like features, the evidence cited for former glaciation includes bowl-shaped depressions fringed by lobate, viscous-flow deposits that extend well out onto the crater floor.

"These bowl-shaped depressions reflect the former location of relatively pure glacier ice," noted David R. Marchant, an Associate Professor of Earth Sciences at Boston University, and co-author of the study published in the August 25th issue of the Proceedings of the National Academy of Sciences with James W. Head of Brown University, lead author, and Mikhail A. Kreslavsky of the University of California, Santa Cruz.

As conditions on Mars shifted toward reduced snowfall at this site, clean ice on the crater wall sublimated, leaving a hole, whereas ice containing appreciable rock-fall debris out on the crater floor became covered with thin rubble, preventing complete volatile loss.

But even as the last glaciers vanished, minor snow likely continued to fall. "This late-stage snow could accumulate in depressions on the crater wall and, in favorable microclimate settings, melt to produce the observed gullies and fans," said Marchant.

"The results", he said, "are exciting because they establish a spatial link between recent gullies and accumulation of glacier ice, strengthening the case for surface melt water flow in the formation of gullies on Mars".

Other candidate processes include dry debris flows and melting of shallow ground ice, but the sequence of events demonstrating recent snowfall in Newton Crater make surface melting of snow banks an appealing choice. In fact, both Marchant and Head have observed similar processes at work in the development of modern gullies within some of the coldest and driest regions of Antarctica.

The authors conclude that changes in the rate and accumulation of snow in Newton Crater are likely related to changes in the inclination of Mars' spin access, or obliquity.

At obliquities even greater than those postulated for glaciation of Newton Crater, the same authors and colleagues postulated even larger-scale mountain glaciation near the equator, on and extending out from the Tharsis volcanoes.

The evidence suggests a link between obliquity, mid-latitude glaciation, and gully formation on Mars. Rather than being a dead planet, the new data are consistent with dynamic climate change on Mars, and with episodes of alpine glaciation and melt water formation in the recent past that rival modern alpine glaciation and gully formation in the coldest and driest mountains of Antarctica.

Source: Boston University

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User comments : 5

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jeffsaunders
5 / 5 (3) Aug 28, 2008
I need clarification - Are we saying in this article that Mars is undergoing Global Warming?
gmurphy
4 / 5 (1) Aug 29, 2008
shouldn't ice on Mars sublimate instead of turning into water?
Modernmystic
5 / 5 (2) Aug 29, 2008
Jeff, I'm not sure if the article is specifically addressing the issue as such, but yes Mars (and indeed other planets) are currently undergoing warming.

I'm also willing to bet this has nothing to do with coal fired power plants on Earth, and more to do with solar variance.
CaptSpaulding
5 / 5 (2) Aug 29, 2008
Modernmystic: how dare you question the far reaching effects of coal fired power plants and a severly limited data collection. Are you trying to imply that the end of an ice age shouldn't be hotter than the coldest part of an ice age? How dare you say such a thing. The knee jerk reactionists would disapprove most highly.
Jess
not rated yet Mar 07, 2009
just a general announcement; the sun has been observed to go through phases of heating and cooling, if i am not mistaken. however, this does not mean that the global warming on earth, which is occurring much more quickly than at any other time in our history, is completely natural. the agendas of the media and politicians, unfortunately, have reduced the scope of our involvement to "ZOMG!!!1! WEZ IZ ALL GUNNA DIIIIEEEE ND ITZ UR FAULT!!!11!"

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