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By Catholic Online (NEWS CONSORTIUM)

6/14/2013 (2 years ago)

Catholic Online (www.catholic.org)

Swings in temperature were found to be 'dominant globally and year-round'

The surface temperatures on Mars rise and fall twice a day instead of once each as on Earth. The phenomenon has long perplexed scientists, but according to new research, the answer may be found in water-ice clouds floating about six to 18 miles above the Martian equatorial surface.

This graphic depicts the Mars Climate Sounder instrument on NASA's Mars Reconnaissance Orbiter measuring the temperature of a cross section of the Martian atmosphere as the orbiter passes above the south polar region.

This graphic depicts the Mars Climate Sounder instrument on NASA's Mars Reconnaissance Orbiter measuring the temperature of a cross section of the Martian atmosphere as the orbiter passes above the south polar region.

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By Catholic Online (NEWS CONSORTIUM)

Catholic Online (www.catholic.org)

6/14/2013 (2 years ago)

Published in Technology

Keywords: Mars. atmosphere, clouds, temperatures, water-ice


LOS ANGELES, CA (Catholic Online) - Resembling thin cirrus clouds on Earth, the clouds absorb infrared light coming from the planet's surface. That absorption is enough to heat the middle atmosphere each day.

"We think of Mars as a cold and dry world with little water, but there is actually more water vapor in the Martian atmosphere than in the upper layers of Earth's atmosphere," Armin Kleinboehl of NASA's Jet Propulsion Laboratory in Pasadena, California says.

"Water-ice clouds have been known to form in regions of cold temperatures, but the feedback of these clouds on the Mars temperature structure had not been appreciated. We know now that we will have to consider the cloud structure if we want to understand the Martian atmosphere."

Mars. Like Earth, experiences a temperature maximum in the middle of the day. Mars also sees a temperature maximum a little after midnight. Kleinboehl, the lead author of the study, says the temperature swings can be as much as 47 degrees Celsius as detected by NASA's Mars Reconnaissance Orbiter. These swings in temperature were found to be "dominant globally and year-round."

Changes in wind, temperature and pressure repeating daily, or for fractions of days, are called atmospheric tides, and they are created by temperature contrasts. While Earth itself experiences atmospheric tides, they don't create vast temperature changes in the lower atmosphere. Because Mars only has about one percent as much atmosphere as Earth, these atmospheric tides "dominate short-term temperature variations throughout the atmosphere," Kleinboehl said.

These patterns on Mars were first seen in the 1970s, but were previously thought to occur only during dry seasons.

"We were surprised to find this strong twice-a-day structure in the temperatures of the non-dusty Mars atmosphere," Kleinboehl said.

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