White paper on "Contrails/cirrus optics and radiation"


Senior Member.

Aviation-Climate Change Research Initiative (ACCRI) - Subject specific white paper (SSWP) on Contrails/cirrus optics and radiation by:

Dr. Ping Yang, PI
Dr. Andrew Dessler, Co-PI
Dr. Gang Hong, Team member

Department of Atmospheric Sciences
Texas A&M University
College Station, TX 77843

I was discussing with a believer on twitter yesterday, and I was looking for something that could tell me something about how low- or high-pressure weather systems effected the consistency of contrails. I found the above mentioned white paper on contrails, which i found quite useful. I have not read it all, but I think a lot of you might be able to use this for something. I could without a doubt use the following paragraph:

A contrail typically has a relatively short lifetime when formed in a subsaturated
environment — e.g., descending air of a high pressure system — and unlikely to have a
significant perturbation on climate. However, in supersaturated air — e.g., ascending air
of a low pressure system — a contrail may be quite persistent, and can quickly (minutes
to hours) spread into an extended cirrus deck.
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The paper discuss how contrails and contrail-induced cirrus clouds are impacting the environment.

I did a few searches, did not seem like this paper has been posted before. If it has, my apologies.


Add up to your reference the sections of IPCC reports concerning Aircraft Induced Cloudiness which I mentioned on another thread in this forum:

IPCC devotes some of his efforts in the so called AIC (Aircraft Induced Cloudiness) because is a significant part of the anthropogenic causes of Climate Change, albeit a small one. Estimates say that AIC contribution is on the same ballpark of CO2 emissions from civil aviation. Good sources:

Germans are so serious about this that some proposals for Europe try to modify flight routes or heights in order to avoid ISRs (Ice Supersaturated Region) which are responsible for persistent contrails evolving in cirri.
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