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Researchers have found that the North Atlantic water has significantly weakened & # 39;
The exam shows levels of less than 1,500 years and climate change is a blame.
The researchers warn that the currents will have a "deep impact" on North American and European climates.
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Weakness of the ocean: North Atlantic North Atlantic traffic is the schematic of Labrador Current (LC) for a strong (left) and weak (right) westward transit transport passage. The interactions of the masses formed in the oceanographic landscape of the Earth and moving towards the west (LC and Labrador the Western Sea Water (LSSW)) and water masses move eastward, Gulf Stream (GS) and Atlantic Waterfall (ATSW). The precise location that corresponds to two water mass systems (a yellow compass line) crosses the northern recycling spin (white arrow), which controls the temperature.
The researchers studied Atlantic Meridional Overturning Circulation (AMOC), a branch of North Atlantic circulation that brought warm surface water and cold water toward the equator.
Research led by Drs. Christelle Not and Benoit Thibodeau, the Department of Earth Sciences and the Swire Institute of the Maritime Science Institute, the Hong Kong University, global warming and Greenlandic ice cream are the direct consequence.
The slower circulation in the North Atlantic may have a major impact on North American and European climatic change, as well as the rainy summer monsoon in Africa and Asia.
AMOC plays a key role in regulating global climate, but scientists are trying to find reliable indicators of intensity in the past.
This discovery of the new AMOC record will improve the understanding of drivers and ultimately help us to better understand the potential future change under global warming, "said Dr. Thibodeau.
The research team also found a weak signal at a time called Little Ice Age (the cold weather between 1600 and 1850).
WHAT DO WE DO?
The rebuilt depth of the Little Ice Age can vary between different surveys
The Little Ice Age occurred between 1300 and 1850.
There were two phases of the Little Ice Age, which continued until the end of the year, beginning in 1290.
It was warmer in the 1500s, after which the climate was significantly diminished between 1645 and 1715.
During the coldest stages of Ice Age, the winter temperatures were 2 ° C below than in today's Europe and North America.
It was frozen in the Baltic Sea, like many European rivers and lakes.
The Frozen Thames, 1677, original painting of the London Museum Collection
Winter was a bit cold and the summers were hot.
These conditions led to worsening of crop failure, hunger and population decline.
The social population increased, with large numbers of people being reduced to pests and poverty.
XX. Regarding the trend of the century, the signs may indicate that this period has been weaker in North Atlantic circulation, that is to say, the fall in heat transfer in Europe contributes to the cold temperatures of that time.
However, more work is needed to validate this hypothesis.
"XX. In order to be able to recharge our temperate temperature during the century, instrumental measurement will not be able to make a slight Ice Age.
This is why we need to do more studies to consolidate this hypothesis & # 39; said Dr. Not
The discoveries have been published in the prestigious magazine Geophysical Research Letters.
The Southern Atlantic Overturning Circulation (AMOC) is the North Atlantic circulation. This brings a warm water surface to the Arctic and deep water to the equator.
This heat and energy transfer does not have a direct effect on Europe and North America, but may affect Africa and Asia's monsoon systems at sea surface temperature, hydrological cycle, atmospheric circulation and intertropic variability.
DRS. No and Thibodeau used microfossils, called foraminifer, found at the sediment center to calculate the past ocean temperature. In the picture, the foraminifer species used in this study
Many climate models predict the weakening and / or circulation of traffic under global warming due to the release of Greenland's freshwater ice sheet.
It has a lower density than freshwater salt and prevents deep water formation, slowing down the entire circulation.
However, this weakness has still been debated due to the lack of long-term record of AMOC.
DRS. No and Thibodeau used microfossils, called foraminifer, found at the sediment center to calculate the past ocean temperature.
In the Channel Channel, there are two major currents in the current sediment center of the Laurentian canal.
The currents of these currents control the temperature of the water in this core area, which indicates that the reconstructed temperature from the nucleus is the force of the North Atlantic circulation.
In collaboration with the United States of America, they obtain results through instrumental data and two model numbers that can be used to simulate climate and ocean.
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