Missing pieces
As many of now you already know
Hanmi responded to a series of questions on the online newspaper Positano News. Reading the comments
Article I jumped to the eye the following comment (frozen
here for future reference) signed on behalf of Rosario Marciano:
"
" the emission of exhaust gases of aircraft, rich nuclei and condensation of water vapor determines the oversaturation of water vapor and, therefore, the formation of contrails. Contrails are formed at heights where the air temperature is very low (below -40 ° C), with relative humidity of 60%. [Jerome Sansosti & Alfio Giuffrida - Manual of Meteorology, A guide to understanding the weather and climate in conjunction with the UAI (Union of Amateur Astronomers Italian) - Gremese Publisher, 2006, p. 86] "
Damn! All the literature says well more about the contrails and this manual says that contrails are formed at least 60% relative humidity?
Let's see what the manual actually says on page 87 (not 86 as mistakenly written in reference)
"
L 'release into the atmosphere of the exhaust gases of air, full of condensation nuclei and water vapor determines the oversaturation of water vapor and, therefore, la formazione di scie. Il meccanismo è simile a quello delle nebbie di avvezione. Le scie di condensazione si formano ad altezze in cui la temperatura dell'aria è molto bassa (inferiore a -40 °C), con umidità relativa almeno del 60%. Le scie possono essre più o meno durature nel tempo, a seconda della stabilità dell'aria e della quantità di vapore presente. "
Il contenuto sulle scie finisce qui, il manuale non dice altro. Dunque vediamo...sarà mica la solita definizione divulgativa? Oppure prendiamo come oro colato qualunque definizione di 7 righe a fronte di migliaia di pagine di letteratura specialistica? Per esempio quella definizione si adatta very well with the parameters for the persistence of contrails. Perhaps the authors excluded for simplicity, the non-persistent contrails that disappear in a few seconds.
In any case, it is curious that the quote was cut the following sentence, which clearly says that contrails can persist and even stranger that has never been shown in the photo side of the short chapter on the trails and found that all ' beginning of this article.
A tip: the quotes are used properly. Can be derived by omitting the part that suits the rest just because it contradicts the theory held, especially if they are 7 rows. In the long run one would think that these selections are not just a coincidence. Following the
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