We remember a lot of water, the land poles turned
If the large water of water were transferred from one place to another, it changed the shape of the land and carried an event called true poarl wirder
Star trails above three gorges dams in Yichang, Hubei Province, China. Many dams like this move the land poles away from the axis of its rotation.
Cynthia Lee / Alamy Stock Photo
In the last 200 years, people keep hundreds of billion-billion liters of water to Thousands of dams around the world. That the settlement of water The push of geographical poles on the ground from its rotation axisA new study published in Geophysical Research Letters found, contributed to an event called Real Polar Wilder.
To an ideal model on our planet, the axis around it Rotates to the ground undergo fixed geographic poles, or what we usually call the North and South Poles. But indeed, the axis that rotates over the planet with distance points from geographically posts, said Jim Davis, a Godesist at Columbia University, not involved in study. The distance between the two is called polar motion, or real polar wandering, and it is important to know for many purposes.
“It should be in astronomers. GPS depends. There are many things that depend on knowing how to rotate the land at the moment,” Davis said. “We need to know the polar motion accurate or otherwise the mistakes will spread other systems in which we are dependent on a daily basis.”
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Real polar arder warrers occur because the The face of the land rotates to redecure the mass and repair its rotation. Imagine our planet as a brown ball that sprangs a person’s finger. If someone sweeps a wad on the ball, the ball can shake the axis of the rotation and moves to adjust the mass development, Davis explained. To the ground, instead of a wad of gum, have moving sheets of ice and Mantle Rock Actions which causes the planet to adjust himself. Although dams move a small amount of mass than other events, they have additional effect.
To determine the magnitude of the effect, the Natasha Valencic, a fourth year Ph.D. Student at Harvard University, and his team makes some minor additions to a Dam Dam’s previously developed and analyzed total of 6,862 dams constructed from 1835 to 2011 from 1835 to 1950s, most of the dams were built in North America and Europe, the North Pole to transfer from these regions. Then, starting in the 1950s, many dams were built in East Africa and Asia, pulling the pole in the other direction. By 2011, only the poo 20.5 centimeters away from its original location, but over time, it turns throughout 113.4 cm, a bit than a meter.
“A meter is larger about polar motion,” Davis said. The study of polar motion reveals something about how much mass moves on the ground, he said. “Masses of the Mass reveal important natural processes of the land system, as well as important changes in man, so the climate change and society change.”
