View allAll Photos Tagged contrails
Not being used to seeing the sky filled with contrails, I find it annoying to shoot in southern California. But sometimes it can work to the photographer's advantage. I actually like the decaying contrails in this image.
As I was trying to decide if I was going to stick around and take a chance on a sunset at Trillium Lake I noticed a airliner jetting across the sky above Mount Hood. I was standing there chatting with my friend Don Pyle when he commented on how he hated con trails. I told him that it was Miles Morgan doing his best to interfere with our chance at a perfect sky.
I told Don that I try to work around them. If you can't prevent it, work with it. If you can't beat 'em, join 'em kind of thing.
I like how this turned out and thought that I would post it here.
It is a gorgeous day outside... and I'm stuck inside looking through a dirty window. I guess it's time to grab the Windex and a roll of paper towels.
Have a great day everyone. : )
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...
Travelling along the Tok Cuttoff we encountered these strange looking contrails over Mentasta Lake. I sent the drone up to check them out, but he came back mad because he was unable to make contrails like those. :) Look close and you can see the reflection of the contrails in the lake. Also there are a couple of swans swimming around.
Contrail, also called condensation trail or vapour trail, streamer of cloud sometimes observed behind an airplane flying in clear cold humid air. It forms upon condensation of water vapour produced by the combustion of fuel in airplane engines. When the ambient relative humidity is high, the resulting ice-crystal plume may last several hours. The trail may be distorted by the winds, and sometimes it spreads outward to form a layer of cirrus cloud.
Flying over Milan at FL 35000 ft (238 hPa) from Moscow to Barcelona
Atmosferic condition at 236 hPa: TEMP -55,5°C RELH 10%
Critical Temperature at 236 hPa: -51,97°C [Contrail Factor 0,039 g / (°C K)]
If you ever want to know where the natural crossroads of America occur, all you have to do is watch the contrails in the sky. Guess which crossroads is ESE of Huntsville, Alabama?
Flights pass over Atlanta, Georgia — leaving contrails -- during sunrise on Monte Sano.
Nikon D7200 — Nikon 18-300mm F6.3 ED VR
170mm
F8@1/100th
ISO 400
DSB_3068.JPG
©Don Brown 2024
Must have been a busy morning for air traffic over North Kent this morning!
Taken at Camer Park near Meopham.
6:53 PM Sunday evening.
I initially thought my eyes were playing tricks on me when I saw a dark line trailing away from the back end of a contrail left by a jet liner flying west. Looking back to the late day lowering sun I realized that the long straight contrail was directly pointed at it and casting a shadow of itself off to the horizon.
I took one picture before I had figured this out and 20 seconds later the shadow was gone from view.
I never get tired of watching the sky.
A jet, somewhere around 30,000 ft reflects a contrail into the sunset as it heads northeast. My guess- NYC.
Jet aircraft engine exhaust contrails amongst some clouds at dusk 4:21pm on January 17th 2017 overlooking the River Blackwater Estuary at Heybridge Basin near the town of Maldon in Essex (UK).
The definition of 'dusk' can be complex although I've always regarded dusk is just after when the sun falls below the horizon as in the case here.
The three official definitions of 'dusk' are thus:
'Civil twilight' dusk ends when the sun is 6 degrees below the horizon in the evening. At this time objects are distinguishable and some stars and planets are visible to the naked eye.
'Nautical twilight' dusk ends when the sun is 12 degrees below the horizon in the evening. At this time objects are no longer distinguishable and the horizon is no longer visible to the naked eye.
'Astronomical twilight' dusk ends when the sun is 18 degrees below the horizon in the evening. At this time the sun no longer illuminates the sky and thus no longer interferes with astronomical observations.
The Basin and Blackwater Estuary area is beautiful part of the world just 10 miles or so from my home.
The orange colour sunset sky effect seen here is caused by an atmospheric phenomenon known as 'Rayleigh scattering'.
My Maldon and the River Blackwater Estuary album flic.kr/s/aHsk7cnJ7a
My 'Sky' album flic.kr/s/aHsiXpSNcx
Photograph taken by and copyright of my regular photostream contributor David and is posted here with very kind permission.