File:Dust and Vortices Behind the Canary Islands (MODIS 2021-05-13).jpg
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Summary
[edit]DescriptionDust and Vortices Behind the Canary Islands (MODIS 2021-05-13).jpg |
English: Strong winds raised dust from the Sahara Desert and sculpted paisley-like patterns in the clouds in mid-May 2021. The Moderate Resolution Imaging Spectroradiometer (MODIS) on board NASA’s Aqua satellite acquired this stunning true-color image of dust and vortices swirling in the atmosphere off of western Africa on May 12.
Theodore von Kármán, a Hungarian-American physicist, was the first to describe the physical processes that create long chains of spiral eddies like the ones shown trailing in the wake caused by wind striking the Canary Islands. Known as von Kármán vortices, the patterns can form nearly anywhere that fluid flow is disturbed by an object. In this case, the unique flow occurs as winds rush past the tall peaks on the islands. As winds are diverted around these high areas, the disturbance in the flow propagates downstream in the form of vortices that alternate their direction of rotation. On this particular day, wind also carried dust from the Sahara Desert offshore, tinting the air south of the Canary Islands a camel-colored tan. Some of the dust appears to be caught in the vortices, swirling along with the cloud. The slice of silver seen at the top of the image and crossing into the vortices is not dust. This is an optical phenomenon known as “sunglint”. It occurs when sunlight reflects off the surface of the ocean at the same angle that the satellite sensor is viewing the surface. The result is a mirror-like specular reflection off the water and back to the sensor, which, on smooth water gleams with a silver tint. |
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Date | Taken on 12 May 2021 | ||
Source |
Dust and Vortices Behind the Canary Islands (direct link)
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Author | MODIS Land Rapid Response Team, NASA GSFC |
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This media is a product of the Aqua mission Credit and attribution belongs to the mission team, if not already specified in the "author" row |
Licensing
[edit]Public domainPublic domainfalsefalse |
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This file is in the public domain in the United States because it was solely created by NASA. NASA copyright policy states that "NASA material is not protected by copyright unless noted". (See Template:PD-USGov, NASA copyright policy page or JPL Image Use Policy.) | ![]() |
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Width | 7,806 px |
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Height | 6,224 px |
Bits per component |
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Pixel composition | RGB |
Orientation | Normal |
Number of components | 3 |
Horizontal resolution | 72 dpi |
Vertical resolution | 72 dpi |
Software used | Adobe Photoshop 22.1 (Macintosh) |
File change date and time | 13:35, 12 May 2021 |
Exif version | 2.31 |
Color space | Uncalibrated |
Unique ID of original document | FCE79918E55994983D02183AB1F69F90 |
Date and time of digitizing | 09:35, 12 May 2021 |
Date metadata was last modified | 09:35, 12 May 2021 |