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Wrangel Island Russia
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Wrangel Island, Russia

September 3, 2008

Part of the Russian Federation, Wrangel Island rests above the Arctic Circle between the Chukchi and East Siberian Seas, northeast of Siberia. Skies were clear over the island in August 18, 2008, giving the Moderate Resolution Imaging Spectroradiometer (MODIS) on NASA's Aqua satellite a chance to capture this image.

Although it looks like bare rock, this mountainous island supports diminutive Arctic tundra plants. To the east of Wrangel, along the edge of a bank of clouds, lies a much smaller landmass: Gerald, or Herald, Island. The paisley-shaped clouds flowing away from Gerald Island are Von Karman Vortices, swirling eddies caused by the island's obstruction of air flow.

The ghostly white shapes northeast and immediately southwest of Wrangel Island are sea ice. Over the course of the satellite record, Arctic sea ice has advanced and retreated past Wrangel Island many times. From 1979 to 2000, the sea ice edge at the end of summer generally fell somewhere in the vicinity of Wrangel Island, but this is not the first summer when the sea ice edge has retreated well north of the island.

The rocks that make up Wrangel Island were deposited between the late Precambrian (before multicellular organisms began leaving fossils in the rock record) and the early Mesozoic Era (the age of the dinosaurs). Erosion from glaciers and weather have reworked these rocks into sands and gravels that cover much of the surface. Barrier islands along Wrangel's northern rim results from sediments being reworked by wave action. This suggests that open water around Wrangel Island has been common enough to create these surf-generated landforms.

Between 1989 and 1991, researchers collected tusks, teeth, and bones from wooly mammoths from Wrangel Island. Radiocarbon dating suggests that mammoths lived on Wrangel Island as recently as 3,730 years ago, as much as six millennia after the same species went extinct in continental Siberia. More recently, the island has been declared a World Heritage site, due to its importance in providing polar bear, Pacific walrus, and migratory bird habitat.



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