Caspian Sea - related image preview

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Caspian Sea

The northern part of the Caspian Sea is plagued by a process called eutrophication, in which agricultural run-ff rich in fertilizers stimulates rampant growth of algae in the water. The death and decay of these algae robs the water of oxygen, with obvious negative consequences for aquatic life. This image of the Caspian Sea shows swirls of green and blue near the mouth of the Volga River (top center), which indicate the presence of algae. The bright blue color of the northeastern part of the sea may be due to a mixture of plant life and sediment, for this is where the sea is most shallow. This image is from the Moderate Resolution Imaging Spectroradiometer (MODIS) on the Terra satellite on June 11, 2003.

Jeff Schmaltz, MODIS Rapid Response Team, NASA/GSFC

Published June 12, 2003
Data acquired June 11 - 11, 2003

Terra > MODIS
Biosphere > Vegetation > Algae
Visible Earth