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domingo, 1 de mayo de 2016

NASA : Ice Scours the North Caspian Sea .- Hielo recorre el Norte del Mar Caspio Mar .................

Hola amigos: A VUELO DE UN QUINDE EL BLOG., hemos recibido una noticia de la Agencia Espacial NASA, y nos dice: "El operativo Land Imager (OLI) del Landsat 8 por satélite de la NASA tomó esta imagen de gran tamaño de color natural que muestra una vista del mar Caspio en todo el Archipiélago Tyuleniy el 16 de abril de 2016. científico del océano Norman Kuring del Centro de Vuelo Espacial Goddard de la NASA encontró una característica desconcertante en la imagen - las líneas que cruzan el  norte del Mar Caspio . Por sí sola, la imagen era sorprendente y hermosa. aguas poco profundas que rodean el archipiélago Tyuleniy le permiten ver la vegetación verde oscuro en el fondo del mar. Pero la pregunta sigue siendo: ¿qué causó esas líneas?
More information..........

Satellite image of sea with islands and lines scoring along ice
 The Operational Land Imager (OLI) on NASA's Landsat 8 satellite acquired this large natural-color image showing a view of the Caspian Sea around the Tyuleniy Archipelago on April 16, 2016. Ocean scientist Norman Kuring of NASA’s Goddard Space Flight Center found a puzzling feature in the image -- lines crisscrossing the North Caspian Sea. On its own, the image was strikingly beautiful. Shallow waters surrounding the Tyuleniy Archipelago allow you to see the dark green vegetation on the sea bottom. But the question remained: what caused those lines?
 
The dark green areas—possibly sea grass or benthic algae—and the lines are features of the sea bottom. “You can tell this by the fact that marks laid down in January have not moved by April,” Kuring said. “If those were water features, they would not persist through one tidal cycle.”
 
It’s possible that some of the marks have a human origin. Similar lines show up in the world’s oceans because of trawling. But the scientific literature and a January satellite image suggest that a majority of the marks in the images were gouged by ice. In January, blocks of ice stand at the leading end of many lines, most notably in the northeast corner of the image. By April, ice has melted and only the scour marks persist.
 
Stanislav Ogorodov, a scientist at Lomonosov Moscow State University who has published research on the phenomenon, agrees: “Undoubtedly, most of these tracks are the result of ice gouging.” Ogorodov notes that this part of the Caspian is very shallow—about 3 meters deep. Ice that forms here in wintertime is usually about 0.5 meters thick, so most of it never touches the seafloor. But the ice tends to be “warm” and thin, which gives rise to relatively weak ice cover that is easily deformed by wind and currents. When pieces of ice are pushed together, some ice is forced upward and downward into so-called “hummocks.” The keels of hummocks, frozen into the ice fields, can reach the seafloor and scour the bed as the ice moves.
Image Credit: NASA image by Norman Kuring, NASA’s Ocean Color web
Caption: Kathryn Hansen
Last Updated: April 25, 2016
Editor: Sarah Loff
NASA
Guillermo Gonzalo Sánchez Achutegui
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