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23.07.2020Much like a car might make a little white cloud near its exhaust on a cold morning, a plane will often leave a trail if the conditions are right. Exhaust from jet engines is pretty much all water vapor, although there can be trace content of sulfur oxides, carbon dioxide, nitrogen, unburnt fuel, soot and small particles of metal. These aerosols provide condensation sites for water vapor, as do any small particles in the air it is flying through.
Some aircraft leave long, defined contrails that persist for several hours after the plane has passed; others leave very short trails that disappear fast.
Why is this? Contrails are generally categorized into three groups; short-lived, persistent non-spreading and persistent spreading. Sometimes, even in the same patch of sky, one plane will leave a trail and one will not. Planes with hotter engines are less likely to form contrails, as the heat of the exhaust prevents ice from forming.
Modern planes with more efficient engines burn hotter, but use bypass air to cool the exhaust, making them more likely to leave contrails in a wider range of situations.
However, the simplest reason for whether a plane makes a contrail or not is down to the environment in which it is flying. One is flying in moist air, while the other is flying in drier conditions. What else do you know about contrails? What else do you want to know? Let us know in the comments! However, such rerouting may force planes to burn more fuel and release more CO 2.
She says it would be better to find more efficient fuels that release less soot. But with the likely increase in air traffic, even that might not be enough. Andrew Gettelman, a cloud physicist with the National Center for Atmospheric Research in Boulder, Colorado, says contrail cirrus clouds are a complex problem, but that their warming effect is still small compared with the overall amounts of CO 2 belched by society.
By Elizabeth Pennisi Mar. By Jennifer Couzin-Frankel Mar. By Sofia Moutinho Mar. By Sofia Moutinho Feb. All rights Reserved. Plane contrails have been found to increase heat in the upper atmosphere. Got a tip? How to contact the news team. Science Insider. Itching to discover a new species? Follow this map By Elizabeth Pennisi Mar. Major coronavirus variant found in pets for first time By David Grimm Mar. Astronomers spy promising blob around our nearest neighbor star, but is it a planet?
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