– The Antarctic sea is flowing faster – with consequences for our weather
Global warming is driving the ocean current. This, in turn, affects the Gulf Stream, which is partly responsible for the climate in northwestern Europe.
According to a team of researchers, global warming is accelerating the massive ocean current around Antarctica. The reason for the acceleration of the so-called polar current is that large areas of the ocean absorb a large part of the heat caused by humansahmen, researchers write about Jia-Rui Shi of the Scripps Institution of Oceanography in La Jolla, California in the journal «The nature of climate change». The researchers analyzed the evolution of this stream with the help of satellite data and buoys from the Argo software. They are distributed in all oceans and can sink to a depth of 2000 meters and then rise again.
According to the Intergovernmental Panel on Climate Change, the oceans have so far absorbed more than 90 percent of the additional heat generated by man-made climate change. This limits global warming. However, this makes the water warmer and expands, which contributes to rising sea levels. Additionally, according to the Intergovernmental Panel on Climate Change, oceans contain 20 to 30 percent of the carbon dioxide produced by humans, which makes their waters more acidic.
It was especially warm north of the river
The polar current always flows eastward around the southern continent and thus connects the Atlantic Ocean, the Pacific Ocean, and the Indian Ocean. It is considered a global conveyor belt that influences heat transfer and material cycles in all oceans. The researchers wrote that water north of the stream absorbed man-made heat and heated more than water in and south of the stream itself. Therefore, the temperature difference increased at the ocean current – It is a factor that always causes ocean currents to accelerate. In particular, the northern part of the river accelerated.
“The circumpolar current is primarily driven by winds, but we have shown, surprisingly, that the change in velocity is mainly due to the change in the temperature gradient.»says co-author Lynn Talley, also of The Scripps Institute. just thisAnd therefore According to the researchers, an additional role is played by the westerly winds in the region, which have been enhanced by climate change. The team wrote that continued ocean warming could increase the speed of the ocean current.
Consequences are varied
Only this year a team from the Alfred Wegener Institute (AWI) in Bremerhaven realized that electricity flows quickly, especially during warm periods. Reported publicly. Among other things, it analyzed a 14-meter crater core with sediments spread over the past 140 years.“000 years ago. This gave the researchers information from the last Ice Age, which occurred before the year 115“000 years and 11“700 years ago, as well as from the last warm period. Result of “Nature Communications” magazine» Study Introduction: During the last warm period the ocean current was faster than it is today.
«At the height of the last warm period of 115“000 to 130“A thousand years ago, the weather was 1.5 to 2 degrees Celsius warmer than it is today. The ocean current could thus accelerate in the context of future global warming»Says co-author Frank Lamy.
This will have far-reaching implications for the climate. For example, the polar current forms other oceanic currents such as the Gulf Stream, which helps define the climate in northwestern Europe. “The new study agrees very well with our findings»Lamy said.