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V02596
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Ref :
V02596
Theme :
Cyclones - Hurricanes - Storms - Clouds
(438 images)
Title :
A Vortex Street in the Arctic
Caption :
Marine stratocumulus clouds frequently form parallel rows, or “cloud streets,” along the direction of wind flow. When the flow is interrupted by an obstacle such as an island, a series of organized eddies can appear within the cloud layer downwind of the obstacle. These turbulence patterns are known as von Karman vortex streets. In these images, an impressive vortex pattern continues for over 300 km southward of Jan Mayen island. Jan Mayen is an isolated territory of Norway, located about 650 km northeast of Iceland in the north Atlantic Ocean. Jan Mayen’s Beerenberg volcano rises about 2.2 km above the ocean surface, providing a significant impediment to wind flow. These images were captured on June 6, 2001. The entire vortex street can be seen in the top panel, which is a natural-color view from the instrument’s nadir (downward-looking) camera. The area covered measures 365 kilometers x 158 kilometers, and a cloud-clearing effect is apparent at the vortex centers until finally closing on the sixteenth “hole.” The bottom panel is a stereo anaglyph of a portion of the vortex street, compiled using data from the satellite's 26-degree forward and 70-degree backward viewing cameras. This view covers an area of about 183 kilometers x 96 kilometers. Despite the vertical exaggeration afforded by using widely separated angles, the relatively modest height variation in the cloud layer implies a vertically stable atmosphere. To facilitate stereo viewing, the images have been oriented with north at the left. Red/blue glasses should be used with the red filter placed over your left eye.
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