Forecast for Titan: Wild weather could be ahead
(Phys.org) —Saturn’s moon Titan might be in for some wild weather as it heads into its spring and summer, if two new models are correct. Scientists think that as the seasons change in Titan’s northern hemisphere, waves could ripple across the moon’s hydrocarbon seas, and hurricanes could begin to swirl over these areas, too.
The model predicting waves tries to explain data from the moon obtained so far by NASA’s Cassini spacecraft. Both models help mission team members plan when and where to look for unusual atmospheric disturbances as Titan summer approaches.
Ligeia Mare, shown in here in data obtained by NASA’s Cassini spacecraft, is the second largest known body of liquid on Saturn’s moon Titan. It is filled with liquid hydrocarbons, such as ethane and methane, and is one of the many seas and lakes that bejewel Titan’s north polar region. Cassini has yet to observe waves on Ligeia Mare and will look again during its next encounter on May 23, 2013. Credit: NASA/JPL-Caltech/ASI/Cornell
“If you think being a weather forecaster on Earth is difficult, it can be even more challenging at Titan,” said Scott Edgington, Cassini’s deputy project scientist at NASA’s Jet Propulsion Laboratory, Pasadena, Calif.
“We know there are weather processes similar to Earth’s at work on this strange world, but differences arise due to the presence of unfamiliar liquids like methane.
We can’t wait for Cassini to tell us whether our forecasts are right as it continues its tour through Titan spring into the start of northern summer.”
Titan’s north polar region, which is bejeweled with sprawling hydrocarbon seas and lakes, was dark when Cassini first arrived at the Saturn system in 2004.
This image shows the first flash of sunlight reflected off a hydrocarbon lake on Saturn’s moon Titan. The glint off a mirror-like surface is known as a specular reflection. This kind of glint was detected by the visual and infrared mapping spectrometer (VIMS) on NASA’s Cassini spacecraft on July 8, 2009. It confirmed the presence of liquid in the moon’s northern hemisphere, where lakes are more numerous and larger than those in the southern hemisphere. Scientists using VIMS had confirmed the presence of liquid in Ontario Lacus, the largest lake in the southern hemisphere, in 2008. Credit: NASA/JPL/University of Arizona/DLR
But sunlight has been creeping up Titan’s northern hemisphere since August 2009, when the sun’s light crossed the equatorial plane at equinox. Titan’s seasons take about seven Earth years to change. By 2017, the end of Cassini’s mission,
Titan will be approaching northern solstice, the height of summer.
Given the wind-sculpted dunes Cassini has seen on Titan, scientists were baffled about why they hadn’t yet seen wind-driven waves on the lakes and seas.
A team led by Alex Hayes, a member of Cassini’s radar team who is based at Cornell University, Ithaca, N.Y., set out to look for how much wind would be required to generate waves.
Their new model, just published in the journal Icarus, improves upon previous ones by simultaneously accounting for Titan’s gravity; the viscosity and surface tension of the hydrocarbon liquid in the lakes; and the air-to-liquid density ratio.
“We now know that the wind speeds predicted during the times Cassini has observed Titan have been below the threshold necessary to generate waves,” Hayes said.
“What is exciting, however, is that the wind speeds predicted during northern spring and summer approach those necessary to generate wind waves in liquid ethane and/or methane. It may soon be possible to catch a wave in one of the solar system’s most exotic locations.”
Provided by NASA
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