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Done deal: Liquid water CAN exist on Mars!

Lunar & Planetary

FAYETTEVILLE, Ark. -- A team of researchers from the University of Arkansas has measured water evaporation rates under Mars-like conditions, and their findings favor the presence of surface water on the planet. Water on the planet's surface makes the existence of pastor present life on Mars a little more likely, according to the group.

Derek Sears, director of the Arkansas-Oklahoma Center for Space and Planetary Sciences, and his colleagues graduate student Shauntae Moore and technician Mikhail Kareev reported their initial findings at the fall 2003 meeting of the Division of Planetary Sciences of the AAS.

The researchers have brought on-line a large planetary environmental chamber in which temperature, pressure, atmosphere, sunlight and soil conditions can be reproduced. Sears and his colleagues use the chamber to investigate the persistence of water under a range of physical environments and to study its evaporation.

For their first experiments, reported at the DPS meeting, the group chose to measure one of the most important properties of water on a planetary surface, the rate at which it evaporates.

"Physicists have long argued that Mars is currently a sterile desert, completely unsuited to life," Sears said. "This conclusion is based on their belief that water would evaporate very quickly, as soon as itappeared on the surface."

The University of Arkansas group examined the effect of Mars' atmospheric conditions -- temperature and wind -- on the evaporation rate. The movement of the atmosphere close to the surface is a crucial factor in the survival of water on Mars. Water evaporates more slowly when evaporated molecules build up over the water's surface, but wind sweeps away evaporated molecules, allowing more water molecules to escape the surface and increasing evaporation rates.

"These findings suggest that even under worst case scenarios, where wind is maximizing evaporation, evaporation rates on Mars are quite low," Sears said. This implies that surface water could indeed exist, or have existed recently, under the given conditions on Mars.

In addition to the evaporation experiments, the group examines the ways in which water-ice behaves when frozen at depth and how it reacts when covered with layers of frost or dust. They also explore how ice behaves when exposed on the surface, and whether it can exist in a transient liquid phase that could harbor life.

The subtle balance between the input of heat from the Sun and subsurface sources and the strength of the surface atmospheric motions determines the fate of the water; whether it remains as ice, becomes liquid, and if so how long it remains as a liquid, or how quickly it evaporates.

"The environmental chamber will enable us to gain new insights into the behavior of water on Mars and reduce much of the speculation on this topic," said Barney Farmer, principal investigator for the atmospheric water vapor mapping experiment during the Viking missions and a member of the Arkansas research group.

Office of University Relations
University of Arkansas

Derek Sears
Professor, chemistry and biochemistry, Fulbright College;
Director, Arkansas-Oklahoma Center for Space and Planetary Sciences
(479) 575-5204, dsears@uark.edu

Melissa Blouin
Science and research communications manager
(479) 575-5555, blouin@uark.edu

EDITORS NOTE: Dr. Sears will be at the Doubletree Monterey during the meeting. The number there is (831) 649-4511.

Originally contributed by AOAS member Dale Hall
Done deal: Liquid water CAN exist on Mars! | 2 comments | Create New Account
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Done deal: Liquid water CAN exist on Mars!
Authored by: bobmoody onThursday, September 04 2003 @ 11:10 pm EDT
These findings are extremely significant in that, not only do they make way for an added dimension to the possibility of past or present life of SOME kind on Mars, but it makes likely the possibility that many of the surface features which indicate the apparently recent evidence for flowing water may be even more recent than thought possible. Now, the possibility of liquid water \"at the surface\" in recent Martian history can stand alone against the most recent theory that \"undergound ices\" occasionally melt under certain specific conditions to form the fresh \"gullies\" seen in many Mars Global Surveyor (MGS) and Mars Orbital Camera (MOC) images.
Done deal: Liquid water CAN exist on Mars!
Authored by: dgrosvold onFriday, September 05 2003 @ 09:18 pm EDT
Background information on Dr. Sears' Planetary Environmental Chamber can be found at http://www.uark.edu/misc/csaps/Research/index.html

Dave Grosvold
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