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Arctic Ocean warming has started in the early 20th century, which means that natural factors have a strong impact, not CO2 – Rising because of that?


From NoTricksZone

Via P Gosselin above 29. December 2021

In a recent paper, scientists expressed their surprise that the Arctic began to warm as early as the 20th century, 100 years ago. This, along with the mandatory CO2 climate warming service, is described in a press release from the University of Cambridge.

Hat-tip: Die kalte Sonne
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via University of Cambridge

An international team of researchers reconstructed the recent history of ocean warming at the gateway to the Arctic Ocean in an area known as the Fram Strait, between Greenland and Svalbard, and discovered that the Arctic Ocean has warmed for much longer than previous records suggest.

Natural ocean currents

The Arctic Ocean has been getting warmer since the early 20sorder century– dozens earlier than the records suggest – due to warmer water flowing into fragile polar ecosystems from the Atlantic Ocean.

An international team of researchers reconstructed the recent history of Ocean warming at the gateway to the Arctic Ocean in the area known as the Fram Strait, between Greenland and Svalbard.

Atlantic water flows into the North Pole

Using chemical signatures found in marine microorganisms, researchers found that the Arctic Ocean began to warm rapidly at the turn of the last century when warmer and saltier water came from the Atlantic. inflow – a phenomenon known as Atlantis – and this change is likely to precede the warming recorded by modern instrumental measurements. Since 1900, ocean temperature increased by about 2 degrees Celsius, while sea ice receded and salinity increased.

The results, reported in the journal Scientific advance, provides the first historical perspective on the Atlantization of the Arctic Ocean and reveals a connection with the North Atlantic that is much stronger than previously thought. This connection has the potential to shape climate change in the Arctic, which could have important implications for sea ice retreat and global sea level rise as polar ice sheets continue. melt.

Atlantis is one of the causes of Arctic warming, but instrumental records capable of tracking this process, such as satellites, go back only about 40 years.

Using chemical signatures found in marine microorganisms, researchers have found that the Arctic Ocean began to warm rapidly at the turn of the last century as warmer and saltier water flowed in from the ocean. Atlantic Ocean – a phenomenon called Atlantization.

The researchers used geochemical and ecological data from ocean sediments to reconstruct changes in water column properties over the past 800 years. They dated the sediments accurately using a combination of methods and looked for diagnostic signs of Atlantis, such as changes in temperature and salinity.

“When we looked at the entire 800-year time calendar, our temperature and salinity records looked pretty stable,” said co-author Dr Tesi Tommaso from the Research Council’s Institute of Polar Sciences. Country in Bologna said. “But suddenly at the beginning of my 20sorder century, you get this dramatic variation in temperature and salinity — it really sticks out. ”

“The reason for this rapid Atlantis at the gateway to the Arctic Ocean is fascinating,” says Muschitiello. “We compared our results with ocean circulation at lower latitudes and found a strong correlation with a slowdown in dense water formation in the Labrador Sea.. In a future warming scenario, this subarctic deep circulation is expected to decrease further as the Greenland ice sheet melts. Our results imply that we can expect more Arctic Atlantis in the future due to climate change.”

The researchers say that their results also show a possible flaw in climate models, because they do not reproduce this early Atlantis process at the turn of the last century.

Climate simulations generally do not reproduce this type of warming in the Arctic Ocean, meaning that there is an incomplete understanding of the mechanisms driving Atlantis,” said Tommaso.. “We rely on these simulations to predict the future climate change, but the lack of any indication of early warming in the Arctic Ocean is a missing piece of the puzzle.”



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