Contrails nasa2004October13



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English: Contrail Clutter over Georgia. Photo from MODIS/Terra Satellite (NASA)
Explanation from NASA: Artificial clouds made by humans may become so common they change the Earth's climate. The long thin cloud streaks that dominate the above satellite photograph of Georgia are contrails, cirrus clouds created by airplanes. The exhaust of an airplane engine can create a contrail by saturating the surrounding air with extra moisture. The wings of a plane can similarly create contrails by dropping the temperature and causing small ice-crystals to form. Contrails have become more than an oddity - they may be significantly increasing the cloudiness of Earth, reflecting sunlight back into space by day, and heat radiation back to Earth even at night. The effect on climate is a topic of much research. this year (2004), NASA made measure of abundance of contrails with people participation in a contrail counting exercise during two days.
Français : Vue satellitale de centaines de contrail au dessus de la Géorgie et des états voisins, prise par le satellite Terra/MODIS de la NASA le 13 octobre 2004
Les contrails sont des nuages artificiels anthropiques se créant à partir des gaz et aérosols émis par les tuyères des avions à réaction. Ils sont devenus si communs qu'ils contribuent à changer le climat et la chimie des hautes couches de l'atmosphère. Les longues traînées de nuages minces qui dominent cette photographie satellitale faite au-dessus de la Géorgie sont des cirrus artificiels créé par les gaz d'échappement des avions, qui saturent l'air ambiant froid d'une quantité supplémentaire de vapeur d'eau, laquelle initie la formation de nuages d'altitudes. Les traînées ne sont plus une bizarrerie observable dans le ciel, elles peuvent augmenter considérablement la couche de nuages qui enveloppe la Terre, et donc son albédo (les surfaces blanches renvoie la lumière solaire vers l'espace le jour, et le rayonnement de chaleur vers la Terre la nuit.
L'effet sur le climat et la couche d'ozone est complexe, et est encore le sujet de nombreuses recherches. La NASA a organisé des journées où les citoyens étaient invités à l'aider à mesurer l'abondance réelle de traînées.
Date 2004/10/13
Source On Nasa's page (Astronomy Picture of the Day )
Author NASA
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On Nasa's page (Astronomy Picture of the Day )

source : Nasa, Astronomy Picture of the Day


Public domain This file is in the public domain because it was created by NASA. NASA copyright policy states that "NASA material is not protected by copyright unless noted". (See Template:PD-USGov, NASA copyright policy page or JPL Image Use Policy.)

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