Satellite images of northern Siberia raise questions among NASA scientists

The geological ambiguity recorded in the photographs gave rise to many scientific hypotheses.

United States, February 27 (RT) Satellite Image Series from U.S Arctic region of Russia It raised questions among scholars NASA.

This week, researchers from the US Space Agency posted on the Internet Earth Observatory Images of Northeast Siberia, recorded by the satellite Landsat 8 Over several years.

In these images, the terrain on either side of the Marga River shows a series of alternating lines, dark and light, tighter in steep and wider areas where the slope is gentle, until they disappear towards the edges.

Images of Northeast Siberia recorded by Landsat 8. Image: NASA.

This peculiarity appears in all seasons of the year, although it is most evident in winter, when snow increases the contrast.

Explanations

Some experts have provided NASA with different explanations for this phenomenon. One hypothesis refers to the fact that this area of ​​the Central Siberian Plateau is within the Arctic Circle, and therefore, 90 percent of the time is covered with permafrost, which sometimes thaws for short periods. It has been known that patches of soil that freeze, thaw, and freeze can form odd polygonal, circular and striped patterns.

Elsewhere, however, these patterns tend to be smaller than those recorded in Siberia.

After soil thawing and freezing it can form odd polygonal, circular and striped patterns. Image: NASA.

Geomorphology researchers offer another explanation: In such colder regions, the ground can turn into “glysol”, which is permafrost soil at the top of two meters, where dark and light layers are usually distinguished based on the spread of organic or mineral matter and sediment content.

When the soil freezes and thaws, the layers split and mix vertically. By repeating these cycles at intervals of time, the layers can line up and form striped patterns. Various types of tundra can grow on top of it, highlighting the streaks seen from space. However, this hypothesis has not been extensively tested.

When the soil freezes and thaws, the layers split and mix vertically. Image: NASA.

Thomas Crawford, a researcher at the US Geological Survey, asserts that the lines reflect a pattern of sedimentary rocks known as “puff pastry geology,” in which these rock layers have been exposed and dissected by erosion. When the snow melts or the rain drifts down the slope, the boulders break apart and slide into ravines. This erosion can cause interlocking patterns, seen as lightning bolts from space.

In winter, the flat parts are covered with snow, and they become lighter, while the darker areas correspond to the slopes. The fading of the striped pattern at the edges is due to sedimentary build-up caused by erosion of millions of years.

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