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Aircraft contrails causing global warming

The Local · 31 Mar 2011, 13:39

Published: 31 Mar 2011 13:39 GMT+02:00

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Experts at the German Aerospace Centre (DLR) calculated that the white lines of vapour left by aeroplanes, knowns as contrails, contribute to high-altitude cirrus clouds, which trap heat.

"Aircraft condensation trails and the clouds that form from them may be causing more warming today than all the aircraft-emitted carbon dioxide (CO2) that has accumulated in the atmosphere since the start of aviation," the journal Nature Climate Change, which published the study, wrote in a commentary.

More than a century after the Wright brothers pioneered fixed-wing flight around the beginning of the 20th century, aviation is today responsible for about three percent of all fossil fuel carbon dioxide emissions.

But the new study by Ulrike Burkhardt and Bernd Kärcher of the DLR found that the total warming effect of contrails and the cirrus cloud that results from them was 31 milliwatts per square metre at any given time – more than the 28 milliwatts resulting from all the accumulated carbon dioxide from aviation.

The line-shaped contrails are formed when hot, moist air coming out of the engine mixes with cold air in the atmosphere. When it is very cold and these form small ice particles, the contrails can spread to form cirrus cloud, which can warm the atmosphere.

Burkhardt and Kärcher developed a model of how these man-made clouds form, grow and spread.

The findings could help scientists develop ways to combat the effects of aviation on climate change, wrote Olivier Boucher of the Met Office Hadley Centre in Britain, in an accompanying commentary.

For example, flight paths could be altered to avoid parts of the atmosphere that were cold enough for spreading ice drops to form, though this was likely to use more fuel, offsetting the benefits.

Story continues below…

Or it could help in the development of a new kind of engine that condenses water vapour before it leaves the aircraft so that it falls the ground as ice crystals.

The Local/djw

The Local (news@thelocal.de)

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Your comments about this article

15:55 March 31, 2011 by elboertjie
Not necessarily the contrails, but rather the CHEMtrails, as in chemical trails.

Do an internet search for 'chemtrails' and you will be amazed what is being sprayed on our heads on a daily basis.
16:42 March 31, 2011 by The-ex-pat
Chemtrails, the only thing I am amazed at is the crap people believe, must be true it is on the internet!!!!
17:36 March 31, 2011 by germinator
yes, best to only trust "official" sources. They never steer you wrong.
19:10 March 31, 2011 by berfel
So it's all from a model. No measurements in the real world?

The output of a computer only confirms the mistakes of the people developing the model.

If the "experiment" is limited to the virtual realities of those imagining the problem, then they are not doing science. It's Science-Fiction; or simply politics and grantsmanship

GIGO: Garbage-In, Grants-Out
20:50 March 31, 2011 by shtain
Chemitrails exist and are no secret and therfore nothing made up on the internet. This project started in the early 90s when they thought they could manage better the weather to let it rain where it was needed and avoid catastrophes. Unfortunately it did not work out so far. You can verify that yourself. If you are lucky, you see two airplanes at the same time. One with a long white contrail and one with a tiny one that is disappearing fast. The latter is normal, the first is a chemitrail. The longer it takes the "clouds" to disappear " (if they do at all), the more chemistry they have sprayed. Not every airline is participating in the spraying.
23:13 March 31, 2011 by wxman
@ The-ex-pat, are you getting as frustrated as I am walking among the zombies? I'm a meteorologist/climatologist for the past 35 years. As I'm sure you know, contrails (not chemtrails) are produced from water vapor produced by the lower pressure and heat of the jet engine at flight levels in the 35 to 40 thousand feet range. The reason they form sometimes and don't at others, and sometimes seem to last a long time are strictly a function of the humidity at ambient air temperature at flight level. Nothing more, nothing less. But don't try to explain science to the "real believers" who typically never had a course in science, math or statistics in their lives.
23:54 March 31, 2011 by Lance64A
The idea that Man can influence climate temperature is a SCAM. If you are familiar with the term "New World Order", you might know that global warming is just a means to redistribute wealth fro richer nations to poorer nations.

The NWO has the following objectives:

1) Abolition of all ordered governments

2) Abolition of private property

3) Abolition of inheritance

4) Abolition of patriotism

5) Abolition of the family

6) Abolition of religion

7) Creation of a world government

Since they (communists, socialists, radicals, Marxists, etc.) can't achieve it all at once, they do it incrementally. The NWO was founded in 1773 Adam Weishaupt, a German. It continues today, with one of the more notable members being George Soros.

Don't believe the hype. Protect your freedoms and do your own investigation of the real facts. As with the article above, you can smell the Left's BS.
00:14 April 1, 2011 by xx.weirich.xx
That sounds like something the Nazis would have said to get people to hate Jews...

But, I agree that the idea of global warming is a scam. First it was all going to get hot, then they decided it was going to get cold and wet. Doesn't make sense.

There's this wonderful thing called El Niño/La Niña. Weather cycles? Anyone heard of it? No?

Earth is a dynamic planet, and it changes. Perhaps the crap that planes toss up into the sky isn't good for the environment, but the chemicals are part of the Earth anyway and would have made it back up there eventually.

We've tried to make planes more efficient already, and we can only better them so fast.

Regardless though, we still have to have planes. We use them to transport goods, people, etc, and without them we wouldn't be so fast-paced as we are.

But let's be prepared to see them jack up the prices of airfare some more to pay for damage to the environment.
02:18 April 1, 2011 by krautrock
2 German scientists?


Ah! so this is the way they call them now.
02:47 April 1, 2011 by Larry Thrash
What a joke the "scientific" community has become. Sounds more like political science. The answers are always more taxes and less freedom.
12:58 April 1, 2011 by dbert4
@Lance64A - It most be liberating to not have to take responsibiliy for ones actions! A world of endless personal liberties and no taxes. Wow what a paradise, if only the laws of nature, physics, and human nature didn't get in the way. But they do, there is no "free lunch".
15:27 April 1, 2011 by Lance64A
@dbert4 - I'm not looking for a free lunch. I pay taxes as well. I just won't stand by and watch a "world government" take away, by fiat, whatever they think they can. The UN is not your friend, and neither are the environmentalists. They work hand in hand to rob your country and mine of anything they can. They do it under the banner of concern and fairness, but that is just BS.
18:32 April 1, 2011 by ebbelwoiguy
I call April Fools on this one.
16:49 April 2, 2011 by AirForceGuy
Bull Honky...
20:04 April 4, 2011 by dizzyblondefrau
It doesn't take more than two brain cells knocking together to know that there is a difference between a contrail and a chemtrail. First, for the first 40 years of my life, I NEVER saw a chemtrail, NEVER. Contrails never last that long. Now for the last several years we see chemtrails LITTERING our skies. Two jets passed over here four days ago, very near each other, one leaving a contrail which disappeared quickly, one leaving a chemtrail which lasted all day. Somedays we have as many as 14 of them over our place, they spread out until the entire sky is overcast. That is NOT contrails. We are not stupid, we can SEE the difference.
20:09 April 10, 2011 by Prowler
Folks, its contrails, plain and simple. If you see one contrail stay and another disappear thats because they are seperated by altitude, i have over 3000 hours on jets, it is amazing how much temperature and wind difference 1000 ft of altitude can bring. Dont waste brain bytes on this folks. And plus once uou see two jets close by, they arent, they need to be seperated by more than 1000ft anove or below and no less than a mile horizontally. - depending on which ATC rules
02:39 June 16, 2011 by strahlungsamt
@elboertjie "Do an internet search for 'chemtrails' and you will be amazed what is being sprayed on our heads on a daily basis."

I just did and here's what I found


"~Special Notice~

I've done a number of radio interviews with Don Nicoloff on the subject of chemtrails and Sylphs. The three radio show listed here will give you a good idea on the overall agenda of chemtrail spraying and how they are mitigated throuigh the use of orgone generators and focused intent. Air elemental beings identified by the ancient Greeks (& Paracelsus) as Sylphs are stimulated and energized by orgone generators and will literally vacumn up and transmute chemtrails into harmless substances. I realize this is hard to believe by the average person who is unaware of these etheric beings, but the evidence can be seen right over your head if you know what to look for...Ken Adachi"

I think somebody needs to go back on his meds.
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