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Home → Space → Astronomy

Water churned up from Saturn’s depths by massive storm

Mihai Andrei by Mihai Andrei
September 5, 2013
in Astronomy, Astrophysics

If you were to look at them from the safety and serenity of your home, the gas giants of our solar system seem to be quite peaceful. Their surface appears smooth, unscathed by meteor impacts or other such phenomena – but this couldn’t be further from the truth, as they sometimes show us.

saturn

In 2010, Saturn began stirring things up, with a giant storm; the storm quickly grew to amazing proportions, reaching 15,000 kilometers (more than 9,300 miles) in width and visible to amateur astronomers on Earth as a great white spot dancing across the surface of the planet.

Now, thanks to near-infrared spectral measurements taken by NASA’s evergreen Cassini orbiter and analysis conducted by the University of Wisconsin-Madison, Saturn’s superstorm is helping researchers understand more about the planet’s deep atmosphere – at heighs typically obscured by a thick haze.

The size of this storm is just mind blowing: 15.000 km wide, 300 km long, covering an entire surface of 4,500,000,000 square km. Just so you can get a term of comparison, the size of the Earth is 510,000,000 square km – almost 1.000 times less!

Astronomers found that loud particles at the top of the great storm are composed of a mix of three substances: water ice, ammonia ice, and… something else, which is yet to be identified – possibly ammonium hydrosulfide. The phenomena which brought these substances forth is also significant.

“We think this huge thunderstorm is driving these cloud particles upward, sort of like a volcano bringing up material from the depths and making it visible from outside the atmosphere,” explains Sromovsky, a senior scientist at UW-Madison and an expert on planetary atmospheres. “The upper haze is so optically pretty thick that it is only in the stormy regions where the haze is penetrated by powerful updrafts that you can see evidence for the ammonia ice and the water ice. Those storm particles have an infrared color signature that is very different from the haze particles in the surrounding atmosphere.”

The new work also helps to validate current models of Saturn storms, giving us a better understanding of gas giant atmospheric processes.

“The water could only have risen from below, driven upward by powerful convection originating deep in the atmosphere. The water vapor condenses and freezes as it rises. It then likely becomes coated with more volatile materials like ammonium hydrosulfide and ammonia as the temperature decreases with their ascent,” Sromovsky adds.

Journal Reference:
L.A. Sromovsky, K.H. Baines, P.M. Fry. Saturn’s Great Storm of 2010–2011: Evidence for ammonia and water ices from analysis of VIMS spectra. Icarus, 2013; 226 (1): 402 DOI: 10.1016/j.icarus.2013.05.043

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