From Dr. Roger Pielke Senior: (with apologies to Tattoo)
There is a news article on March 29 2011 from Rueters titled
The text begins with [highlight added]
“Aircraft condensation trails criss-crossing the sky may be warming the planet on a normal day more than the carbon dioxide emitted by all planes since the Wright Brothers’ first flight in 1903, a study said on Tuesday.”
Another excerpt reads
“The study, by experts at the DLR German Aerospace Center, estimated that the net warming effect for the Earth of contrails and related cirrus clouds at any one time was 31 milliwatts per square meter, more than the warming effect of accumulated CO2 from aviation of 28 milliwatts.”
If correct, this is a remarkable finding with respect to contrails as a climate forcing. It also shows that as we study the climate system, we find it is affected by a wider diversity of human climate forcings than concluded by the IPCC. The human effect on the climate system is not dominated by CO2 and a few other greenhouse gases.
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Just a firm reminder, any comment mentioning, referring to, or paraphrasing anything to do with “chemtrails” will be automatically sent to the bit bucket. – Anthony
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[snip – link to chemtrail website, see admonition at end of article]
Jet contrails supposedly cause ‘global dimming’ which artificially causes global warming to be suppressed according to this BBC documentary supposedly masking how bad AGW is.
Part 1/5 (10:00 minutes)
Chicken Little The Sky Is Falling documentary. What do you think Mr. Watts of this documentary in relation to your posting?
George E. Smith says:
March 31, 2011 at 5:31 pm
Out of the frying pan and into the fire.
Now that AGW is falling apart, it’s back to CO2 causes global cooling, or AGC.
Bit by bit, item by item, that is where the CO2 tax train is headed.
Give them a few more years, and they’ll be jumping up & down about Global Cooling being all your fault.
[snip . . abusing the host is just bad manners]
Gary Pearse says:
Since you are making this claim, I assume you have evidence, e.g., comparing the IPCC reports to back it up?
Actually, the runs starting in 1990 that are in the 3rd IPCC report show that we are just about where the models were projecting we would be.
How about the skeptics…Have you ever wondered how their past projections would be doing?
I have to point out here that by your stipulation “no ch*mtr@ils” you are essentially stating that “the science is settled”.
[snip – No, sorry, wrong. I’m simply stating that I don’t wish to discuss the topic in my own virual living room. Boorish guests who insist on violating my requests to keep the conversation focused on the actual science being discussed related to a potential climate forcing, politely get shown the door. There’s plenty of places on the net where you can discuss the ch*mtr@ils topic all you wish. Go there, enjoy. – Anthony]
Fair enough, WuWt remains one of my favorite “virtual rooms” in the universe and keep up the good work all. The two topics are inextricable entwined in my opinion, but I will try to refrain from boorishness and attempt to tread water with these smart guys and gals…
At the risk of boorishness I would like to point out that tinfoil hats increase the surface albedo, reflecting sunlight that might otherwise be absorbed and re-radiated as heat, and therefore tinfoil hats mitigate against Thermageddon at a model-able efficiency in W/m2, more so than contrails, which may warm or cool depending on who you’re talking to, whereas tinfoil hats definitely cool the planet as well as overheated brain matter, and therefore are recommended apparel for any warmist believer who really cares.
Mike D,
Your theory has merit. Tinfoil hats are a robust negative feedback. Given the large number currently in use in places like Berkeley, East Anglia, Santa Cruz, Chico, Penn State, Madison, etc., they have a greater cumulative forcing than
chemtrailswater vapor.☺If they would just stop adding aluminum and barium to the jet fuel mixture, the contrails would dissipate shortly after the exhaust stream like it used too. I spoke to Governor Rick Scott’s office and he got the air force to stop doing it over our state. No noticeable airplane exhaust in our skies for the past two months and our skies are now beautiful again.
So are greenhouses!
Cool images of Almeria
A quick check in IPCC Fig SPM 2 shows an estimate for forcing from contrails of 3 to 30 mW/m2. This new figure of 31 mW/m2 is at the upper end of that range, but hardly revolutionary. Pielke’s comment about IPCC is thus unfair.
Does anyone take into consideration the black budget and Geoengineering? There aren’t THAT many commercial flights!