View allAll Photos Tagged contrails
"Comet of the Century". It should have been so bright now that we could have seen it during the day! Evidently coming too close to the sun, it was torn apart. Too bad. We could have really taken some amazing photos of it.
The streak in this photo is the contrail of a jet departing Atlanta.
3 contrails over my back garden this morning in Newport, South Wales.
The aircraft crossing from left to right is an Alitalia Airbus A330-202 EI-EJP flying at 39,000 feet en-route Toronto (YYZ) - Rome (FCO).
antwrp.gsfc.nasa.gov/apod/image/0410/contrails_nasa.jpg
NASA research suggests that contrails can add significantly to greenhouse heat-trapping.
World Changing: www.worldchanging.com/archives/001398.html
Contrails - NOT chemtrails
Jets leave white trails, or contrails, in their wakes for the same reason you can sometimes see your breath. The hot, humid exhaust from jet engines mixes with the atmosphere, which at high altitude is of much lower vapor pressure and temperature than the exhaust gas. The water vapor contained in the jet exhaust condenses and may freeze, and this mixing process forms a cloud very similar to the one your hot breath makes on a cold day.
Jet engine exhaust contains carbon dioxide, oxides of sulfur and nitrogen, unburned fuel, soot and metal particles, as well as water vapor. The soot provides condensation sites for the water vapor. Any particles present in the air provide additional sites.
Depending on a planes altitude, and the temperature and humidity of the atmosphere, contrails may vary in their thickness, extent and duration. The nature and persistence of jet contrails can be used to predict the weather. A thin, short-lived contrail indicates low-humidity air at high altitude, a sign of fair weather, whereas a thick, long-lasting contrail reflects humid air at high altitudes and can be an early indicator of a storm.
The mixing gases contained in the contrail rotate with respect to the ambient air. These regions of rotating flow are called vortices. (Any sharp surface, such as the tip of a wing, can cause vortical flow in its wake if it is sufficiently large or the flow is sufficiently fast.) On occasion, these trailing vortices may interact with one another.
In one well-known example of this fact, the Crow Instability causes the vortices to develop symmetric sinusoidal oscillations and eventually to merge and form vortex rings behind the jet. This instability can be triggered by turbulence in the surrounding air or by local variation in air temperature or density, which may itself be the result of the stratification of the atmosphere. When the contrails are visible and strong, it is possible to see the white streaks become wavy and then leave rings floating high in the sky, like smoke rings from a giant cigar.
Recent research has suggested that the ice clouds contained in contrails cause greenhouse effects and contribute to global warming as part of the insulating blanket of moisture and gases in the atmosphere. Researchers in this area seized on the opportunity presented on September 11 and 12 over the U.S. The complete cessation of commercial air traffic offered a control sky without contrails for use in quantifying the environmental effects of contrails.
Source: www.scientificamerican.com/article/why-do-jets-leave-a-wh...
This is a 3-shot pano looking over the rough pastureland from my home. Don't really know why I took it because we're always getting networks of contrails here!
It was lovely and quiet after the Icelandic volcanic eruption a few years ago when all aircraft were grounded for a few weeks ... the sky got bluer! And quieter! Still, mustn't grumble eh? Folks need their holidays on the Costa Lot 😁
Oddly enough, this afternoon was very different, with strangely coloured, almost purple in fact, clouds! Ooer! Eh?
Second contrail on black. Taken in sunset light. View On Black
I actually had to de-satuarate the picture a bit!
....or as the conspiracy nuts would say, BLACK CHEMTRAIL! -a particularly fine example over Avonmouth
My fiance, Mark, alerted me to this! It looks like turbulence patterns in the clouds caused when aircraft have flown through them.
Taken with a Canon 1100D with 18-55mm lens. Hand held
Contrails of a plane flying over Minneapolis.
Contrails (short for "condensation trails") or vapour trails are visible trails of condensed water vapour made by the exhaust of aircraft engines. As the hot exhaust gases cool in the surrounding air they may precipitate a cloud of microscopic water droplets. If the air is cold enough, this trail will comprise tiny ice crystals.
The main products of hydrocarbon fuel combustion are carbon dioxide and water vapor. At high altitudes this water vapour emerges into a cold environment, and the local increase in water vapour can push the water content of the air past saturation point. The vapour then condenses into tiny water droplets and/or deposits into ice. These millions of tiny water droplets and/or ice crystals form the vapour trail or contrails. The energy drop (and therefore, time and distance) the vapour needs to condense accounts for the contrail forming some way behind the aircraft's engines. The majority of the cloud content comes from water trapped in the surrounding air.[citation needed] At high altitudes, supercooled water vapour requires a trigger to encourage deposition or condensation. The exhaust particles in the aircraft's exhaust act as this trigger, causing the trapped vapour to rapidly turn to ice crystals. Exhaust vapour trails or contrails usually occur above 8000 metres (26,000 feet). where the temperature is below -40°C (-40°F).
Source: Wikipedia
April 11, 2009. Minneapolis, MN. Contrails over Twin cities.
i think these contrails might be responsible for yesterday's striped clouds. or not. i don't know. :) maybe i'm reaching.
The shadows of two contrails on a distant cloud layer as seen in Sycamore Canyon, part of Arizona's Verde Valley. I couldn't remember ever seeing anything like this before.
Also, center right, note the five contrails - I wish I had my telephoto handy to capture the military planes flying in formation. The best part is the sunset only got better - 15 minutes later, the sky was on fire.
Ten minutes later the space shuttle contrails had become a very cool looking cloud and the sun was helping make it worth photographing.
High up there is a McDonnell Douglas MD 11F freighter aircraft (N276UP) as operated by UPS on flight 5X226 from Cologne in Germany to Louisville USA.
The aircraft is at an altitude of just 30,000 feet (a lowish cruising height), it's travelling at 516 miles per hour (ground speed) and is some 43 minutes out of Cologne Airport.
The aircraft is flying west not far from of the well known Clacton VOR (Very high frequency Omni directional Radio) aviation navigation beacon which is just a few minutes flying time from here.
I spotted this contrail while out in my back yard at my home in the County of Essex (UK) and the aircraft itself is around 19 miles away (in a straight line ;-)
All my contrails www.flickr.com/photos/stuart166axe/tags/contrail
My Aviation album flic.kr/s/aHsjuyqPMt