Storms of powdery Martian soil are contributing to the loss of the planet’s remaining water.
This newly proposed mechanism for water loss, reported January 22 in Nature Astronomy, might also hint at how Mars originally became dehydrated. Researchers used over a decade of imaging data taken by NASA’s Mars Reconnaissance Orbiter to investigate the composition of the Red Planet’s frequent dust storms, some of which are vast enough to circle the planet for months.
During one massive dust storm in 2006 and 2007, signs of water vapor were found at unusually high altitudes in the atmosphere, nearly 80 kilometers up. That water vapor rose within “rocket dust storms” — storms with rapid vertical movement — on convection currents similar to those in some storm clouds on Earth, says study coauthor Nicholas Heavens, an astronomer at Hampton University in Virginia.
At altitudes above 50 kilometers, ultraviolet light from the sun easily penetrates the Red Planet’s thin atmosphere and breaks down water’s chemical bonds between hydrogen and oxygen. Left to its own devices, hydrogen slips free into space, leaving the planet with less of a vital ingredient for water.
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