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A series of opinion pieces on, mostly climate change and related subjects to do with New Zealand.

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2 C temperature rise in North.

23/12/2015

4 Comments

 
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Living in New Zealand we only see a jet contrail once a week or so whereas when in the UK there would be thousands each day and especially in the early morning when all the trans-Atlantic flights come in from the USA. By 10.00 AM the sky would be a milky blue white and this would be normal. Industrial soot and dust add to the story.
In the UK sunbathing is common and it takes a long time to get sunburn. While part of this is due to the higher latitude, a big proportion is due to the cloud cover caused by the jet contrails. In New Zealand you will burn after 15 minutes in the sun and although the lack of ozone protection is part of the story the very clear air gives the Sun direct access to the surface and projects more heat.
Evidence of this comes from the 9/11 disaster in the USA as, when the jets were grounded for three days the temperature of the whole country rose by 1.8 C and the then settled back to normal.
The contrail cloud cover has two effects where firstly it reflects incoming heat back into space during the day and secondly it also stops heat that is nearer the ground escaping and therefore raises the temperature, which is most noticeable at night.
The combined effect is a flattening of the temperature range.
The worry here is that if we eventually get to the point where we really do start to recognize that climate change is ruining the planet and cut back hard on the big polluting industries we have locked in a nearly 2 C temperature hike across the Northern hemisphere which would be instantaneous.

4 Comments
rose clucas
23/12/2015 10:40:24 pm

Have you got any comments o. The conspiracy theory on chemtrails

Reply
Bob Bingham
24/12/2015 10:11:14 am

The contrail conspiracy is in the same class as the moon landing being filmed in a hanger in the desert in the USA.

Reply
Bob Bristow
23/12/2015 11:18:19 pm

A recent Smithsonian Magazine article discusses airplane contrails, with some good quotes from Dr. Kevin Trenberth.

“It seems quite possible that [Long is] seeing something that’s real,” says Kevin Trenberth of the National Center for Atmospheric Research. But there’s a lot more work that needs to be done to verify the find and make a connection to the climate.

Skies aren’t clear all the time, and why they are clear one day and not the next could matter. “The reason for the clear sky is a factor [Long] needs to explore more,” Trenbeth says.





Still we shouldn't rely on accidental geoengineering to solve our unbalanced cycle and accumulating GHG problem. We need to take action, globally.

Airplane Contrails May Be Creating Accidental Geoengineering


http://www.smithsonianmag.com/science-nature/airplane-contrails-may-be-creating-accidental-geoengineering-180957561/?no-ist


George Monbiot has a rather scathing article on conspiracy. .

http://www.theguardian.com/environment/georgemonbiot/2015/dec/04/the-contrails-conspiracy-is-not-just-garbage-its-letting-aviation-off-the-hook

Reply
Bob Bingham
24/12/2015 10:21:26 am

There is not a lot of information about contrails and the atmosphere but I was first alerted to it by a report dealing with pan evaporation. My personal experience of the difference between living in the UK and living on a boat in the Mediterranean and then here in New Zealand leads me to believe that it is an element that need considering. It is not changing the overall temperature of the planet but locally, on a busy plane route, it could have a bid effect.

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    Bob Bingham 

    Occasional blog posts on topical news items concerning the climate.  Please click the RSS feed to receive updates.

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