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Contrails of two jets that passed on their way to the airport in Montreal. The equivalent of a 170mm telephoto on 35mm full frame.
Click on the photo to view larger and see the beautiful texture of the trees' bark.
These are slash pines, a tree I have come to love. I was struck by the play of sunlight and shadow on this already gorgeous vista, with the wispy clouds in the background and the jet's contrail.
I hope you enjoy it too.
This photo was taken on my way to work. It was a fantastic but short moment and I was able to take a few shots before these awesome colors were gone. It was really hard to wait all day before I had time to process the images.
The main products of hydrocarbon fuel combustion are carbon dioxide and water vapor. At high altitudes this water vapor emerges into a cold environment, and the local increase in water vapor can raise the relative humidity of the air past saturation point. The vapor then condenses into tiny water droplets which freeze if the temperature is low enough. These millions of tiny water droplets and/or ice crystals form the contrails. The time taken for the vapor to cool enough to condense accounts for the contrail forming some way behind the aircraft's engines. At high altitudes, supercooled water vapor requires a trigger to encourage deposition or condensation. The exhaust particles in the aircraft's exhaust act as this trigger, causing the trapped vapor to condense rapidly. Exhaust contrails usually form at high altitudes; usually above 8,000 m (26,000 ft), where the air temperature is below −36.5 °C (−34 °F). They can also form closer to the ground when the air is very cold and has enough moisture. ----
In this shot you can see different colors because the planes were flying at different altitudes. And the setting sun cast a different light.--------------
Le scie di condensazione sono strisce nuvolose inizialmente sottili che, successivamente, si allargano formando ampi nastri che si sfioccano lateralmente. Esse sono generate dal passaggio di aeromobili. Le prime osservazioni di scie di condensazione sono attestate durante e subito dopo la prima guerra mondiale.Per molti anni le scie vennero considerate poco più di un fenomeno atmosferico legato all'aviazione, ma con la seconda guerra mondiale divennero di notevole importanza per le operazioni aeronautiche militari in quanto potevano rendere facilmente individuabili i bombardieri in alta quota. Il termine inglese "contrail" (da "condensation trail") fu coniato proprio nel 1941. In questo scatto si vedono colori diversi perchè gli aerei volavano a quote differenti. Il sole al tramonto proiettava una luce diversa.