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Contrails (short for condensation trails) or vapor trails are line-shaped clouds produced by aircraft engine exhaust or changes in air pressure, typically at aircraft cruising altitudes several miles above the Earth's surface. Contrails are composed primarily of water, in the form of ice crystals. The combination of water vapor in aircraft engine exhaust and the low ambient temperatures that exist at high altitudes allows the formation of the trails. Impurities in the engine exhaust from the fuel, including sulfur compounds (0.05% by weight in jet fuel) provide some of the particles that can serve as sites for water droplet growth in the exhaust and, if water droplets form, they might freeze to form ice particles that compose a contrail. Their formation can also be triggered by changes in air pressure in wingtip vortices or in the air over the entire wing surface. Contrails, and other clouds directly resulting from human activity, are collectively named homogenitus.
Depending on the temperature and humidity at the altitude the contrails form, they may be visible for only a few seconds or minutes, or may persist for hours and spread to be several miles wide, eventually resembling natural cirrus or altocumulus clouds. Persistent contrails are of particular interest to scientists because they increase the cloudiness of the atmosphere. The resulting cloud forms are formally described as homomutatus, and may resemble cirrus, cirrocumulus, or cirrostratus, and are sometimes called cirrus aviaticus. Some persistent spreading contrails contribute to climate change. R_825
additional Information: this photo wasn´t "photoshopped" in any way - only some corrections regarding color and contrast have been done - the content itself is completely untouched and original.
I hope someone enjoys and will make this to one of his/her favorites - also kind comments are very welcome!
Meanwhile I´ve choosen to do this into the group of "Your best shot 2016" due to a flickr friend as you can see under the comments...
...and because I like it too!
One source says the Nyenchen Tanglha Mountains range is about 1,000 km (620 mi) in length. Its highest point is 7,090 m (23,260 ft) located 100 km (62 mi) to the northwest of Lhasa. The range is parallel to the Himalayas in the Transhimalayas, and north of the Brahmaputra River. [3] Another source says the Nyenchen Tanglha Mountains extend 460 miles (740 km) from Nyêmo County in the west to Ranwu County (the southwestern part of Baxoi County) in the east.
Its highest peak is Mount Nyenchen Tanglha (Nyainqêntanglha Feng) at 7,162 metres (23,497 ft).[4]
The southern side of the Nyenchen Tanglha Mountains is precipitous, and falls by around 2,000 metres (6,600 ft), while the northern side is fairly level and descends about 1,000 metres (3,300 ft). Most of the mountains are below 6,500 metres (21,300 ft).[5] They contain 7080 glaciers covering an area of 10,700 square kilometres (4,100 sq mi).[4]
The Nyenchen Tanglha Mountains have an average latitude of 30°30'N and a longitude between 90°E and 97°E. Together with the Gangdise Shan located further west, it forms the Transhimalaya [a] which runs parallel to the Himalayas north of the Yarlung Tsangpo River.
The Drukla Chu river rises in the Nyenchen Tanglha Mountains, where it is called the Song Chu river, and joins the Gyamda Chu river. The combined rivers run about 100 kilometres (62 mi) southeast to the Yarlung Tsangpo river.
My given theme for this week is Parallel Lines in monochrome so here goes number 1. Volkes Railway Lines Brighton East Sussex, UK.
I don't think the exuvia belongs to this male Eastern Amberwing, but it makes a great foot rest....
(Perithemis tenera)
-best viewed large
This beautiful lady, [https://www.flickr.com/photos/hopefulgirl], has my utmost respect. She not only deserves it, but has earned it. She is proof that strength and tenderness can run parallel. I have never met someone as loyal.
I love you, Auntie, my friend.