Thursday, January 29, 2009

Hydrocarbon Rain May Fill Titan's Lakes



CYCLOPS: Cassini Finds Hydrocarbon Rains May Fill Titan Lakes. (Hat tip: Universe Today)

Recent images of Titan from NASA’s Cassini spacecraft affirm the presence of lakes of liquid hydrocarbons by capturing changes in the lakes brought on by rainfall.

For several years, Cassini scientists have suspected that dark areas near the north and south poles of Saturn’s largest satellite might be liquid-filled lakes. An analysis published today in the journal Geophysical Research Letters of recent pictures of Titan's south polar region reveals new lake features not seen in images of the same region taken a year earlier. The presence of extensive cloud systems covering the area in the intervening year suggests that the new lakes could be the result of a large rainstorm and that some lakes may thus owe their presence, size and distribution across Titan’s surface to the moon’s weather and changing seasons.

The high-resolution cameras of Cassini’s Imaging Science Subsystem (ISS) have now surveyed nearly all of Titan’s surface at a global scale. An updated Titan map, being released today by the Cassini Imaging Team, includes the first near-infrared images of the leading hemisphere portion of Titan’s northern "lake district” captured on Aug. 15-16, 2008. (The leading hemisphere of a moon is that which always points in the direction of motion as the moon orbits the planet.) These ISS images complement existing high-resolution data from Cassini’s Visible and Infrared Mapping Spectrometer (VIMS) and RADAR instruments.

Such observations have documented greater stores of liquid methane in the northern hemisphere than in the southern hemisphere. And, as the northern hemisphere moves toward summer, Cassini scientists predict large convective cloud systems will form there and precipitation greater than that inferred in the south could further fill the northern lakes with hydrocarbons.

Some of the north polar lakes are large. If full, Kraken Mare -- at 400,000 square kilometers -- would be almost five times the size of North America’s Lake Superior. All the north polar dark ‘lake’ areas observed by ISS total more than 510,000 square kilometers -- almost 40 percent larger than Earth’s largest “lake,” the Caspian Sea.

However, evaporation from these large surface reservoirs is not great enough to replenish the methane lost from the atmosphere by rainfall and by the formation and eventual deposition on the surface of methane-derived haze particles.

“A recent study suggested that there's not enough liquid methane on Titan's surface to resupply the atmosphere over long geologic timescales,” said Dr. Elizabeth Turtle, Cassini imaging team associate at the Johns Hopkins University Applied Physics Lab in Laurel, Md., and lead author of today’s publication. “Our new map provides more coverage of Titan's poles, but even if all of the features we see there were filled with liquid methane, there's still not enough to sustain the atmosphere for more than 10 million years.”

Combined with previous analyses, the new observations suggest that underground methane reservoirs must exist.

4 comments:

Bloggin' Brewskie said...

National Geographic had a cover story on Saturn several years ago; Titan was mentioned in it. The article said, “If you humans ever develop the capability to extract hydrocarbons from Titan, they’ll never have to worry about running out of oil.”

Louis Hissink said...

We have another almost unlimited source of hydrocarbon under our feet - there is no need to go to Titan to get it.

OilIsMastery said...

Correct...=)

Anaconda said...

"ALMOST UNLIMTED SOURCE OF HYDROCARBON UNDER OUR FEET"

Yes, Louis it's true.

And, yes, it is conceivable that Man could consume more oil than is stored and BEING created in the depths of the Earth's crust.

(What level of consumption would that be? 150 million barrels a day? 200 million, nobody knows -- present daily production is roughly 85 million barrels a day.)

But Man is embarking, actually well on his way to tapping the largest oil deposits on Earth where deposits less than a billion barrels is considered less than newsworthy.

These great oil deposits are offshore and this is also where Man can tap oil deposits with direct conduits to zones of oil formation.

Even at relatively shallow depths, oil wells are like the Energizer bunny rabbit...they keep going and going (some Texas and Middle East oil wells are still going strong after 70 years)...

Man's applied material science (engineering) has made leaps and bounds in the last twenty years to tap this oil efficiently and as technology matures less costly fashion.

The Earth's transform faults are only beginning to be explored (most are deep under the oceans), and these are areas of great promise for huge replentishing hydrocarbon deposits.

Yes, Man's prospects for nearly unlimted continued access to hydrocarbons is bright, indeed.