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Contrail Shadows (clouds sky ). Photo by polymorph
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Contrail Shadows

Uploaded by: polymorph

Wednesday February 6, 2013

Embudo, NM (Current Weather Conditions)

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Manufacturer: SONY

Model: NEX-5N

Orientation: top - left

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Exposure Bias: -1.00 EV

MaxApertureValue: 4.34 EV (f/4.5)

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Focal Length: 55.0 mm

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Display: 50, 100, 200 Sort: Newest First - Order Posted
2. polymorph
1:35 PM GMT on February 07, 2013
Quoting forrestfrench:
More like a few chemtrails to cloud the day. Contrails don't linger and spread like this.


Actually, I believe that they can and do often spread and linger when the atmospheric conditions are right. Another name for this phenomena is persistent contrail cirrus, and it has been documented for decades.

Back in the 90s a friend had a contract job at Boeing related to this. He's an atmospheric physicist and was asked to advise them under what conditions persistent contrails would form, so they could advise their clients how to avoid making them.

Persistence is largely a function of relatively humidity with respect to water vapor saturation. Boeing's problem in Europe is that so many flights over so small of a region cause significant contrail cirrus and the European governments were making rumbles about legislation to limit the number of flights. That would impact airline profits, so the airlines turned to the airplane manufacturers for a solution, who in turn asked scientists like my friend for help. Sometimes, it is possible to fly a bit higher (or lower) to avoid a band of moister air where contrails are likely to persist. The minor inconvenience of adjusting altitude is nothing to the significant loss of profits the airlines were facing, and my friend gave his recommendations on how they could mitigate the problem.

Earlier in the day I shot the above wunderphoto, I was up in the road in Espanola. That gave me a better view of the horizon to the west. I could see that over the mountains there were relatively short persistent contrails. I could see how almost every plane flying over those mountains seemed to leave a contrail above them as it passed over the mountain range. I also observed how those contrails were drifting over the Rio Grande valley, twisting and growing in the wind.

Why would the contrails start and then stop only over the mountains? Because the mountains are a large land mass that forces air to rise when it meets the mountains. Warmer air near the surface can carry more moisture in it, and when that warm air is forced up by the barrier made by the mountains at ground level, that warm air cools and gets supersaturated with respect to water vapor.

I wrote an article about the alleged chemtrail phenomena as explained by atmospheric physics and psychology, on my blog entitled Chemtrails and the Lizard Brain. We can't help avoid living in some degree of fear. It keeps us alive. My best advice to you is to "fear smarter". Chemtrails probably don't exist and probably aren't a threat to humans, but global warming probably is.
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Member Since: March 16, 2003 Comments: 255
1. forrestfrench
10:13 AM GMT on February 07, 2013
More like a few chemtrails to cloud the day. Contrails don't linger and spread like this.
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Member Since: January 16, 2010 Comments: 1

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About polymorph

polymorph

I'm a reader, writer and troublemaker. I also like to take pictures and make time lapses.

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