2021-11-26

The study found that the Arctic Ocean began warming decades earlier than we thought

By yqqlm yqqlm

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using the chemical characteristics found in marine microorganisms, researchers found that the Arctic Ocean began to warm rapidly at the beginning of the last century, because warmer and saltier water flowed from the Atlantic. This phenomenon is called atlanticization, and this change is likely to be before the warming recorded by modern instruments. Since 1900, the ocean temperature has increased by about 2 degrees Celsius, while the sea ice has receded and the salinity has increased

The study found that the Arctic Ocean began warming decades earlier than we thought

this result reported in the journal progress of science provides the first historical perspective for the atlanticization of the Arctic Ocean and reveals that its connection with the North Atlantic is much stronger than previously thought. This connection can shape the change of Arctic climate. With the continuous melting of polar ice sheet, it may have an important impact on sea ice retreat and global sea level rise

The study found that the Arctic Ocean began warming decades earlier than we thought(1)

due to climate change, all the oceans in the world are warming. The Arctic Ocean is the smallest and shallowest ocean in the world, warming the fastest among all the oceans. Due to the feedback mechanism, the warming rate of the Arctic is more than twice the global average. According to satellite measurements, we know that the Arctic Ocean has been warming steadily, especially in the past 20 years, but researchers want to put the recent warming into a longer-term background

using geochemical and ecological data from marine sediments, the researchers reconstructed the changes in water column properties over the past 800 years. They use a variety of methods to accurately measure sediments and look for diagnostic signs of warming, such as changes in temperature and salinity. When we look at the time scale of 800 years, the temperature and salinity records seem quite constant, but at the beginning of the 20th century, we saw this obvious change in temperature and salinity