Lakes in the limelight, the 2013 image bonanza continues |
Lakes in the limelight, the 2013 image bonanza continues |
Sep 13 2013, 02:20 PM
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#101
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Senior Member Group: Members Posts: 3516 Joined: 4-November 05 From: North Wales Member No.: 542 |
A fantastic collection of new images of the northern lakes has just arrived: http://saturn.jpl.nasa.gov/photos/raw/rawi...?imageID=298704
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May 5 2017, 02:14 PM
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#102
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Senior Member Group: Moderator Posts: 2785 Joined: 10-November 06 From: Pasadena, CA Member No.: 1345 |
Nitrogen is perfectly happy to stay in liquid methane.
But if you "warm"* it up a little, decrease atmospheric pressure a little, or add a little ethane, then the nitrogen no longer be happy and it will come out. *"warm" is relative, we're still at around 91 K-ish. But there's already a huge difference in the amount of dissolved nitrogen between methane at 85 K and methane at 95 K. The expected densities change a bit due to saturation with nitrogen and we calculated that out and showed it in one of the figures in the paper. For liquids flowing across the surface, I'd think they might be the same temperature as the surroundings. Actually, if a methane/nitrogen river flows into a lake with a little ethane mixed in the higher density of ethane should win out and the incoming stream liquids would be less dense than the ethane-methane-(+not-as-much nitrogen) mix. The new liquids would want to float. So you might get a neat-o layering effect with methane-nitrogen on top, and slightly higher density ethane mix on the bottom. (Think tequila sunrise). That would set up the system for eventual compositional mixing/nitrogen exsolvation bubble-time. Whee! -------------------- Some higher resolution images available at my photostream: http://www.flickr.com/photos/31678681@N07/
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