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Aug 3 2011, 03:55 PM
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Newbie Group: Members Posts: 10 Joined: 20-April 05 Member No.: 293 |
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Aug 5 2011, 04:00 AM
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Member Group: Members Posts: 555 Joined: 27-September 10 Member No.: 5458 |
What would be the correlation to seasonal changes for the reflectivity of dust/soil? It seemed as if that was a major component to the liquid water hypothesis.
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Aug 5 2011, 06:37 AM
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Senior Member Group: Members Posts: 1582 Joined: 14-October 05 From: Vermont Member No.: 530 |
What would be the correlation to seasonal changes for the reflectivity of dust/soil? It seemed as if that was a major component to the liquid water hypothesis. Whatever triggers the streaks is seasonal, sure. I'm open to the trigger being water.. Something changes the properties of one small section of dust, and a cascade starts. I just think a sluff of dry dust could also explain the apparent albedo change, if dry dust rolling downslope is simply clumpier than dust that fell from the atmosphere. They slowly fade due to constant dust falling from the atmosphere. I think with any explanation for causing their appearance, that's the reason they disappear, right? I actually don't think dry processes can explain it all. Sure, a few exfoliating pieces of gravel could drop onto dust slopes that are at their maximal steepness and start dry cascades... but it seems like there's way too much action going on, so of it triggered away from any rock faces. The real question in my mind seeing the apparent albedo change... is there necessarily a change in composition, or is it just a change in texture? It looks more wet... it may just be more rough. (Or ruff, if I stick with the phonetic version of slough.) |
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