One of the more controversial environmental issues, which emerged in the final years of the Soviet era, was the plan to dam and reverse the flow of north-flowing rivers in order to irrigate the dry southern steppes. This scheme was roundly criticised by scientists and environmentalists at the time because of fears for the impact on the Arctic Ocean and global climate. It now appears that nature performed this experiment some 90,000 years ago.
This months issue of the Journal of Quaternary Science reports evidence based on years of fieldwork in Siberia by Professor Jan Mangerud, of the University of Bergen, Norway, which indicates that early in the last Ice Age, natural ice dams formed and drastically altered the drainage patterns of the region.
At the start of the ice age an ice sheet formed over the shallow Barents and Kara seas forming a natural dam. As the ice advanced onto the Siberian mainland, it blocked the flow of the northerly flowing rivers, including the Yenissei, Ob, Pechora and Dvina, which supply most of the Arctic Ocean with its freshwater. Huge ice-dammed lakes were formed which covered massive areas of Siberia. One of these on the western Siberian Plain was more than twice as large as any lake on Earth today. The overflows from these lakes were towards the south, into the Aral, Caspian and Black seas which were also connected by large rivers. The drainage of the Eurasian continent was thus reversed.
Joanna Gibson | alphagalileo
NASA looks to solar eclipse to help understand Earth's energy system
21.07.2017 | NASA/Goddard Space Flight Center
Scientists shed light on carbon's descent into the deep Earth
19.07.2017 | European Synchrotron Radiation Facility
Physicists have developed a new technique that uses electrical voltages to control the electron spin on a chip. The newly-developed method provides protection from spin decay, meaning that the contained information can be maintained and transmitted over comparatively large distances, as has been demonstrated by a team from the University of Basel’s Department of Physics and the Swiss Nanoscience Institute. The results have been published in Physical Review X.
For several years, researchers have been trying to use the spin of an electron to store and transmit information. The spin of each electron is always coupled...
What is the mass of a proton? Scientists from Germany and Japan successfully did an important step towards the most exact knowledge of this fundamental constant. By means of precision measurements on a single proton, they could improve the precision by a factor of three and also correct the existing value.
To determine the mass of a single proton still more accurate – a group of physicists led by Klaus Blaum and Sven Sturm of the Max Planck Institute for Nuclear...
The research team of Prof. Dr. Oliver Einsle at the University of Freiburg's Institute of Biochemistry has long been exploring the functioning of nitrogenase....
A one trillion tonne iceberg - one of the biggest ever recorded -- has calved away from the Larsen C Ice Shelf in Antarctica, after a rift in the ice,...
Physics supports biology: Researchers from PTB have developed a model system to investigate friction phenomena with atomic precision
Friction: what you want from car brakes, otherwise rather a nuisance. In any case, it is useful to know as precisely as possible how friction phenomena arise –...
21.07.2017 | Event News
19.07.2017 | Event News
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21.07.2017 | Physics and Astronomy