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Message
Latest Sat Image of Oil Spill
Posted on 7/17/10 at 9:03 am
Posted on 7/17/10 at 9:03 am
Clearly shows a big hole in the main spill area
2
Posted on 7/17/10 at 10:30 am to CE Tiger
Link please....
Posted on 7/17/10 at 12:11 pm to CE Tiger
the darkest part is the oil FWIW
Posted on 7/17/10 at 12:15 pm to baytiger
quote:
the darkest part is the oil FWIW
wrong - its wave anomalies
it cant distinguish heavy oil from sheen but its still a good tool for knowing the extents
Posted on 7/17/10 at 12:17 pm to CE Tiger
um... the oil flattens the waves and makes them appear dark. it causes the wave anomalies.
hence why low wind areas are also darker than the surrounding sea
hence why low wind areas are also darker than the surrounding sea
This post was edited on 7/17/10 at 12:18 pm
Posted on 7/17/10 at 12:18 pm to CE Tiger
Then why does it have an arrow pointing to it labeled "Possible Oil"?
Posted on 7/17/10 at 12:21 pm to baytiger
agreed but you still cant say everything you see that is black is oil - it may be sheen or even sargasm.
regardless its pretty encouraging to see that there has been a pretty nice hole developed since the well has been capped.
regardless its pretty encouraging to see that there has been a pretty nice hole developed since the well has been capped.
Posted on 7/17/10 at 12:22 pm to MountainTiger
quote:
"Possible Oil"?
because they cant call it oil - it is an anomaly that is understood as oil
Posted on 7/17/10 at 12:25 pm to CE Tiger
One of us is misunderstanding the other. The big black patch in the center. They are saying it's oil. Are you saying it's oil or not oil? I also don't see the hole you're talking about.
This post was edited on 7/17/10 at 12:27 pm
Posted on 7/17/10 at 12:26 pm to CE Tiger
quote:
regardless its pretty encouraging to see that there has been a pretty nice hole developed since the well has been capped.
yeah. it could be any number of things causing it.. there's no way the cleanup has done that much. It's probably caused by mixing in the last couple weeks due to all the rain and winds down here.
for reference, this was two weeks ago, data from the same satellite:
Posted on 7/17/10 at 12:31 pm to MountainTiger
quote:
The big black patch in the center. They are saying it's oil.
the black patch in the center is very likely oil.
Flat sea reflects radar right back to the satellite. Rough sea tends to reflect it back in random directions.
Higher percentages of reflected radiation appear black in radar satellite images, with gray to white receiving progressively less.
Oil acts to flatten waves due to surface tension as well as decreasing friction with the boundary layer. Low winds can also cause smooth seas.
The winds over the spill have been 5-15 kts persistently for the past 3+ days, according to buoy 42020, which would be plenty to kick up the wave action required to differentiate between water and oil, but not strong enough to mix away the oil layer.
therefore, the deep black pointed out in the picture is almost certainly oil.
Posted on 7/17/10 at 12:33 pm to baytiger
quote:
the black patch in the center is very likely oil.
I agree but I want to know what CE Tiger thinks it is. Because I don't see the hole he's referring to.
Posted on 7/17/10 at 12:40 pm to MountainTiger
you can see it better looking at the derived composite
Posted on 7/17/10 at 12:42 pm to CE Tiger
oh, so you're calling the area around 28.5 N 88 W a "hole"?
Posted on 7/17/10 at 1:59 pm to baytiger
yes.
im curious if this will become the "donut hole" of the spill since no new oil is leaking into the gulf
im curious if this will become the "donut hole" of the spill since no new oil is leaking into the gulf
Posted on 7/17/10 at 2:16 pm to CE Tiger
sounds delicious
Posted on 7/17/10 at 9:43 pm to baytiger
quote:
Flat sea reflects radar right back to the satellite. Rough sea tends to reflect it back in random directions.
Higher percentages of reflected radiation appear black in radar satellite images, with gray to white receiving progressively less.
That is incorrect.
The smooth seas reflect specularly like a mirror, so the transmitted energy bounces back into space but not back to the satellite (a radar imaging satellite will never be looking straight down but at a grazing angle of 20-60 degrees).
The rough seas will scatter the radio wave in all directions, including back toward the radar. So rough seas will look brighter than smooth seas.
In these radar images, high return areas are closer to white and low return areas are black.
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