A new study published in the journal suggests that climate change may be the reason for the recent changes in the Earth’s rotation axis Geophysical Research Letter.
As the temperature of the atmosphere rises due to the burning of fossil fuels, glaciers around the world have melted, redistributing enough water to make The location of the north and south poles will move eastward Since the mid-1990s.
The position of the magnetic pole is not fixed. This study shows that the way water flows on the planet’s surface is a factor in the drift of the poles.
In the past, only natural factors (such as ocean currents and convection of hot rocks deep in the earth) affected the location of the poles. However, new research shows that since the 1990s, the hundreds of billions of tons of ice lost to the ocean every year have caused the poles to develop in new directions due to the climate crisis.
Deng Shanshan, a co-author of the Institute of Geographical Sciences and Natural Resources of the Chinese Academy of Sciences, said: “The faster melting of ice under global warming is the most likely cause of the reversal of polarity drift in the 1990s.” freed.
Since the 1980s, the position of the poles Has moved about four meters. Scientists found that the direction of polar drift changed from south to east in 1995, and the average drift speed from 1995 to 2020 was 17 times that from 1981 to 1995.
Since the Grace satellite gravity data was launched in 2002, the two satellites have been used in 2005 and 2012 to link melting glaciers to polar motion due to increased ice loss. However, new research shows that human activities have changed since the 1990s.
Although studies have shown that glacier loss is most of the reason for the changes in the earth’s rotation axis, the pumping of groundwater may also cause polar motion.
Groundwater is stored underground, but once it is pumped for drinking or used in agriculture, most of it will eventually flow into the sea, redistributing its weight around the world. In the past 50 years, Humans have extracted 18 trillion tons of water Deep underground sediments do not need to be replaced.