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Studies have found that the Arctic Ocean began to warm up decades earlier than we expected.

An international group of researchers reconstructs the history of recent ocean warming at the gateway to the Arctic Ocean in a region called the Fram Strait between Greenland and Svalbard, as previous records suggest. I have found that it has been warming for much longer than. Credit: Sara Giansiracusa

The Arctic Ocean has been warming since the beginning of 20 yearsNS Centuries decades earlier than records suggest due to the warm waters flowing from the Atlantic Ocean into delicate polar ecosystems.


An international group of researchers has reconstructed the recent history of Ocean Global warming At the gateway to the Arctic Ocean in a region called the Fram Strait between Greenland and Svalbard.

Using the chemical characteristics found in marine microorganisms, researchers have discovered that the Arctic Ocean began to warm rapidly as warmer and saltier water flowed in from the Atlantic Ocean. This is a phenomenon called Atlanticization, and this change can precede warming. Documented by the latest instrument measurements. Since 1900 Seawater temperature Sea ice receded and salinity increased, while it increased about 2 degrees Celsius.

Results reported to the journal Science AdvancesProvides the first historical perspective on the slope of the Arctic Ocean, revealing a much stronger connection to the North Atlantic than previously thought. This connection can shape Arctic climate change. This can have a significant impact on sea ice receding and global sea level rise as polar ice sheets continue to melt.

Climate change is warming all of the world’s oceans, but the world’s smallest and shallowest Arctic Ocean is warming fastest.

Dr. Francesco Musquitiello, co-author of the Faculty of Geography, University of Cambridge, said: “Based on satellite measurements, we know that the Arctic Ocean has been steadily warming, especially over the last two decades, but we wanted to put the recent warming in a longer context.”

Atmospheric warming is one of the causes of Arctic warming, but records of equipment that can monitor this process, such as satellites, date back about 40 years.

The Arctic Ocean began to warm decades earlier than we expected-research

Using the chemical characteristics found in marine microbes, researchers have discovered that the Arctic Ocean began to warm rapidly at the beginning of the last century as warmer and saltier water flowed in from the Atlantic Ocean. This is a phenomenon called Atlanticization. Credit: Sara Giansiracusa

As the Arctic Ocean warms, polar ice melts, which affects the world’s sea level. When the ice melts, much of the surface of the sea is exposed to the sun, releasing heat and raising temperatures. As the Arctic continues to warm, permafrost melts and stores large amounts of methane. This is a greenhouse gas that is far more harmful than greenhouse gases. carbon dioxide..

Researchers have used geochemical and ecological data from seafloor sediments to reconstruct changes in water column characteristics over the last 800 years. They used a combination of methods to accurately dating sediments and looked for diagnostic signs of atlantion, such as changes in temperature and salt content.

“Over the entire 800-year timescale, temperature and salt records look fairly constant,” said Dr. Tesi Tommaso, co-lead author of the Institute for Polar Sciences of the National Research Council of Bologna. increase. “But suddenly at the beginning of 20 yearsNS In the century, you get this remarkable change in temperature and salt-it really stands out. “

“The reason for this rapid Atlanticization at the Arctic Gate is intriguing,” Muschitiello said. “Comparing our results with the low-latitude ocean circulation, we find a strong correlation with the slowdown of high-density water formation in the Labrador Sea. In future warming scenarios, this subpolar deep circulation is found. Is expected to decline further. Our results suggest that climate change may lead to further Atlanticization of the Arctic in the future. “

Researchers say their results also reveal potential flaws in climate models, as they did not reproduce this early Atlanticization at the beginning of the last century.

“Climate simulations usually do not reproduce this type of warming in the Arctic Ocean, which means that we have an incomplete understanding of the mechanisms that drive atlantion,” Tommaso said. “We are using these simulations to predict the future. Climate changeHowever, the lack of signs of early warming in the Arctic Ocean is a piece of the puzzle. ”


Arctic ice packs succumb to Atlanticization


For more information:
Tommaso Tesi, Rapid Atlanticization along the Fram Strait in the early 20th century, Science Advances (2021). DOI: 10.1126 / sciadv.abj2946.. www.science.org/doi/10.1126/sciadv.abj2946

Quote: The Arctic Ocean began to warm decades earlier than we expected, the findings (2021, November 24) are https://phys.org/news/2021-11-arctic-ocean- Obtained November 24, 2021 from warmer-decades-earlier.html

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Studies have found that the Arctic Ocean began to warm up decades earlier than we expected.

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