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Sediments and Phytoplankton Near Volga Delta in Northern Caspian Sea

46.1N 50.9E

May 11th, 2013 Category: Lakes, Rivers, Sediments

Russia – May 10th, 2013

 This image shows the Volga Delta and the northern part of the Caspian Sea, bright green and blue from sediments and phytoplankton. The sedimentation rates and the types of recent deposits in the Northern Caspian Sea are governed mainly by the abundant Volga discharge.

Investigations based on a complex of techniques revealed that the modern deposits in the Northern Caspian Sea involve terrigenous sands and aleurites with an admixture of detritus and intact bivalve shells, including coquina. Generally, these deposits overlay dark grayish viscous clays.

A similar geological situation occurs in the Volga delta; however, the local deposits are much poorer in biogenic constituents. Illite prevails among the clay minerals. The heavy transparent minerals are represented in the coarse aleurite fraction mostly by epidotes, while quartz and feldspars represent the lighter minerals. The sedimentary material in the Volga delta is far from completely differentiated into fractions due to the abundance of terrigenous inflows, which exceed the energy potential of the river (click here for more information).

Dust Over Caspian Sea South of Volga Delta

39.4N 53.1E

April 4th, 2013 Category: Dust Storms, Lakes, Rivers

Caspian Sea – April 2nd, 2013

Plumes of dust blow northwestward off the eastern shores of the Caspian Sea. One plume blows across the lower part of Karabogas Bay, while the other, slightly further south, blows across the peninsula on which the city of Hazar is located, in Turkmenistan. Visible in the northern part of the sea are sediments and phytoplankton growth near the fan-shaped Volga River Delta.

Plume of Dust Over Caspian Sea

39.4N 53.1E

April 3rd, 2013 Category: Dust Storms, Lakes

Caspian Sea – April 2nd, 2013

A plume of dust blows across the peninsula on the eastern shores of the Caspian Sea on which the city of Hazar, Turkmenistan, is located. A thinner veil of dust can also be seen over the Caspian Sea, Karabogas Bay (north of the peninsula) and Sarygamysh Lake (upper right).

Sediments in Southern Caspian Sea

37.9N 50.9E

March 16th, 2013 Category: Lakes, Sediments

Caspian Sea – March 8th, 2013

The Caspian Sea can be considered as having three parts: a northern part, with a mean water depth of only 10 m; a central part, where the water depth increases up to 788 m; and a southern part, wherein the water depth increases up to 1025 m. Climate change may be responsible for a decline in water levels since the 1930s. This image focuses on the southern section, whose southern rim is lined by sediments and where there is a considerable presence of sediments by the southeastern shores.

 

Global Warming and North Caspian Sea Ice – March 3rd, 2013

46.1N 50.8E

March 3rd, 2013 Category: Climate Change, Image of the day, Lakes

Caspian Sea – February 28th, 2013

Vivid green and blue sediments and algae peek out from below the ice covering the northern part of the Caspian Sea. Higher winter temperatures, possibly related to changes in global climate observed in recent years, have caused thinner ice coverage. Scientists have demonstrated a downward trend in ice coverage since the 1930s. This has implications for endemic wildfire, for example by restricting the traditional reproduction grounds of the Caspian seal in the shallow waters of the northern Caspian (click here for more information).

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