NASA scientists have found that cirrus clouds, formed by contrails from aircraft engine exhaust, are capable of increasing average surface temperatures enough to account for a warming trend in the United States that occurred between 1975 and 1994.
Gordonsmall From United Kingdom (Scotland), joined Jun 2001, 1972 posts, RR: 34 Reply 2, posted (5 years 7 months 3 days 12 hours ago) and read 3208 times:
That's quite an impressive picture - and it's also my new desktop wallpaper!
Berkeley produced two major products: LSD and Unix. Coincedence?
Jamesag96 From United States, joined exactly 8 years ago today! , 2095 posts, RR: 14 Reply 7, posted (5 years 7 months 3 days 10 hours ago) and read 2712 times:
Can't remember where I saw this...but I did see a story about a professor in CA that had theorized that contrails did in fact cause cooling during the day, and warming at night. Though horrible, 9/11 gave him the opportunity to study the climate because for a few days there were no contrails as there were no aircraft in the sky.
What he found was interesting and disturbing. He found that the temperature was indeed lower by a few degrees during the day, and that it was a few degrees warmer at night. Doesn't sound like too much, but plants and animals are very sensitive to such things.
Thestooges From , joined Dec 1969, posts, RR: Reply 11, posted (5 years 7 months 2 days 15 hours ago) and read 1879 times:
When I used to live in Amsterdam, which always has a lot of planes flying over head in every possible direction, on clear days (or what should have been clear days) there could sometimes be a lot of clouds caused by aircraft contrails.
TFJamie From Iceland, joined Mar 2004, 118 posts, RR: 0 Reply 12, posted (5 years 7 months 2 days 15 hours ago) and read 1762 times:
If this is true, then the global warming people has been talking about is in fact local warming in areas with heavy air traffic. That's very good for the world as it means that global warming will not have serious effects, the main risk of it always being the melting of icecaps and changing of ocean currents. This might very well be, given the amount of unreliable data supporting the global warming theory.
Aloha: There is absolutely no reason for natural cirrus clouds to become more prevalent if there's no air traffic, so this is certainly an issue.
Md80fanatic From United States, joined Apr 2004, 2429 posts, RR: 14 Reply 15, posted (5 years 7 months 2 days 14 hours ago) and read 1690 times:
Every action has a reaction....so this is definately an "issue".
Some common fuel additives: from-> http://www.csgnetwork.com/jetfuel.html
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1. Anti-oxidants prevent the formation of gum deposits on fuel system components caused by oxidation of the fuel in storage and also inhibit the formation of peroxide compounds in certain jet fuels.
2. Static dissipator additives reduce the hazardous effects of static electricity generated by movement of fuel through modern high flow-rate fuel transfer systems. Static dissipator additives do not reduce the need for `bonding' to ensure electrical continuity between metal components (e.g. aircraft and fuelling equipment) nor do they influence hazards from lightning strikes.
3. Corrosion inhibitors protect ferrous metals in fuel handling systems, such as pipelines and fuel storage tanks, from corrosion. Some corrosion inhibitors also improve the lubricating properties (lubricity) of certain jet fuels.
4. Fuel System Icing Inhibitors (Anti-icing additives) reduce the freezing point of water precipitated from jet fuels due to cooling at high altitudes and prevent the formation of ice crystals which restrict the flow of fuel to the engine. This type of additive does not affect the freezing point of the fuel itself. Anti-icing additives can also provide some protection against microbiological growth in jet fuel.
5. Metal de-activators suppress the catalytic effect which some metals, particularly copper, have on fuel oxidation.
6. Biocide additives are sometimes used to combat microbiological growths in jet fuel, often by direct addition to aircraft tanks; as indicated above some anti-icing additives appear to possess biocidal properties.
7. Thermal Stability Improver additives are sometimes used in military JP-8 fuel, to produce a grade referred to as JP-8+100, to inhibit deposit formation in the high temperature areas of the aircraft fuel system.
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I don't know about you, but I am more than a little concerned when aircraft carry "biocides" in their fuel crossing the most fertile food growing areas in the world. Do we know if this stuff is destroyed by combustion? Do we care? We should.
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