File:VolgaDelta AMO 2005jun11.jpg
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Summary
editDescriptionVolgaDelta AMO 2005jun11.jpg |
Satellite image of the w:Volga Delta at the w:Caspian Sea. This time of year, the river is running high, flushed with melting snow and springtime rain. The flood water has swept dark brown mud into the Caspian Sea. The mud fades to a soupy green as it becomes diluted in the water. While most of the green seen in the Caspian Sea in this image appears to be diluted mud, some may be phytoplankton or w:algal blooms, particularly in the lower right corner of the image. Satellite image of the w:Volga Delta at the w:Caspian Sea. The deep green braids of the Volga River fan into a broad delta on the northwest shore of the Caspian Sea. More than 500 channels flow from the river into the sea, creating a web of wetlands that supports hundreds of species of birds, fish, and plants. The Volga River delta is one of the most productive regions of the world for fish, particularly caviar-producing sturgeon, 25 percent of which live in the Volga River. The delta also contains oil deposits where millennia of carbon-rich mud have piled until pressure and heat converted the organic material in the lowest layers into petroleum. This photo-like image of the delta was taken by the Moderate Resolution Imaging Spectroradiometer (MODIS) on NASA’s Aqua satellite on June 11, 2005. This time of year, the river is running high, flushed with melting snow and springtime rain. The flood water has swept dark brown mud into the Caspian Sea. The mud fades to a soupy green as it becomes diluted in the water. Mud is not the only thing pouring into the sea with the river water. The Volga River is Europe’s longest river, flowing some 3,700 kilometers (2,300 miles) from its source in the Valday hills of northwest Russia to the Caspian Sea. As it winds its way through Russia, it passes through several large cities, and it is lined with agriculture. In its travels, the river picks up agricultural and industrial run-off, and these chemicals are deposited into the Caspian at the Volga River delta. The added fertilizers nourish the algal blooms that grow on the surface of the sea, allowing them to grow larger. When they die, the plants begin to sink and are consumed by bacteria. A thick layer of decaying plants can suck all of the oxygen out of the water, leaving pockets of oxygen-poor water where fish cannot survive. For this reason, large algal blooms can result in fish kills. While most of the green seen in the Caspian Sea in this image appears to be diluted mud, some may be phytoplankton or algal blooms, particularly in the lower right corner of the image. |
Date | |
Source | https://earthobservatory.nasa.gov/images/5650/volga-river-delta |
Author | Jeff Schmaltz, MODIS Land Rapid Response Team at NASA GSFC |
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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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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 10:58, 12 August 2019 | 1,115 × 1,061 (276 KB) | Ariadacapo (talk | contribs) | Crop back to original ratio (75 % horizontally, 81 % vertically using CropTool with lossless mode) | |
10:55, 12 August 2019 | 4,400 × 5,600 (5.32 MB) | Ariadacapo (talk | contribs) | Original from source | ||
23:46, 8 May 2006 | 540 × 540 (62 KB) | Holly Cheng (talk | contribs) | {{Information | Description=Satellite image of the w:Volga Delta at the w:Caspian Sea. This time of year, the river is running high, flushed with melting snow and springtime rain. The flood water has swept dark brown mud into the Caspian Sea. The |
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Orientation | Normal |
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Horizontal resolution | 72 dpi |
Vertical resolution | 72 dpi |
Software used | Adobe Photoshop CS Windows |
File change date and time | 16:17, 16 June 2005 |
Color space | Uncalibrated |
Image width | 4,400 px |
Image height | 5,600 px |
Date and time of digitizing | 11:17, 16 June 2005 |
Date metadata was last modified | 11:17, 16 June 2005 |