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originally posted by: GodEmperor
For those of you unaware, chemspraying is a slang term for lingering contrails.
I wouldn't count on weather reporters to get things right. Climatologists have a different take and have studied the effects of contrails quite a bit.
the weather reporters usually identify chemtrails as 'high wispies' and acknowledge they slightly reduce surface temperatures.
Contrails have an effect on the Earth's energy balance similar to that of high thin ice clouds3. Their trapping of outgoing longwave radiation emitted by the Earth and atmosphere (positive radiative forcing) is partly compensated by their reflection of incoming solar radiation (negative radiative forcing). On average, the longwave effect dominates and the net contrail radiative forcing is believed to be positive1, 2, 4.
We show that the radiative forcing associated with contrail cirrus as a whole is about nine times larger than that from line-shaped contrails alone. We also find that contrail cirrus cause a significant decrease in natural cloudiness, which partly offsets their warming effect. Nevertheless, net radiative forcing due to contrail cirrus remains the largest single radiative-forcing component associated with aviation.
The kind that spread out over several hundred meters in width in just 15-20 minutes, please explain how a simple vapor trail could do that.
If the air at flight level is not supersaturated, persistent contrails will not form. It's weather. How many days have you seen it go without rain, then it does?
I would also like to know how there could be zero persistent trails for so long?