We know when sea level suddenly overtakes natural fluctuations

De 1940 à 2000, une accélération sans précédent de l'augmentation du niveau de la mer s'est produite. © spiritofamerica, Adobe Stock

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[EN VIDÉO] By 2100, sea level will rise by about one meter
Ultimate satellites are a good way to accurately measure sea level rise due to climate change. In orbit, they witness the most subtle changes and take them with millimeter accuracy. The Cnes (National Center for Space Studies) tells us more in this video.

According to a study published in Natural communicationThe researchers found that the rising sea level had clearly passed Natural variation In 1863 itself. Surprisingly, this was the first time the results were out. global warming Began to experience themselves in the oceans, as well The melting of glaciers, Is directly related to human activity. And warming of the oceans Source Ice is one of the two main causes of rising sea levels.

For 1,700 years, global sea levels have been subject to gradual but small fluctuations: the level has decreased by 0.3 mm and increased by 0.2 mm. Between 1700 and 1760, just before Industrial Revolution And the massive use of BiofuelsThe sea level dropped by 0.1 mm.

Between 1940 and 2000 there was a drastic change, and the global sea level rose sharply to 1.4 millimeters per year! These 60-year intervals (1940 to 2000) showed an unprecedented increase in sea level, more than nearly 2,000 years ago. Archaeological studies and analysis Remains Geochemistry shows that the North Atlantic Ocean was the region where this acceleration first occurred. North of the Atlantic Ocean, this rapid acceleration occurred from the mid-19thE Century, more precisely between 1820 and 1860 The latest IPCC report. On the other hand, in the rest of the Atlantic Ocean, acceleration did not begin until the mid-20s.E Century.

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The relationship between global warming and rising sea levels

Remember the use of fossil fuels (Gas, Oil, Coal) Is released in large quantities Greenhouse gas : IOzoneCarbon dioxide, water vapor, Methane as well as Nitrous oxide These are the major gases that contribute to the greenhouse effectAtmosphereThe trapping part Hot On Terre. In addition to the melting of land ice, ocean temperatures are rising Expansion Some water. Accordingly Conservation-NatureSea level rise is associated with the expansion of 1/3 of the oceans and 2/3 of the melting of the oceans. Glaciers And mountains Polar hats. This melting is mainly noticeable in the polar regions of the Arctic and Antarctica. ” The total melting of Antarctica would be equivalent to a sea level rise of 60 m, of which Greenland’s melting would add 7 m. Announcement Conservation-Nature. Accordingly The latest IPCC report Published in August 2021, we can expect an average rise of 50 cm by the end of the century and 2 m by 2300 or earlier.

This increase will cause some areas to disappear underwater, leading to migration Millions of climate refugees It also increases the risk of drowning at sea The storm OrHurricane.

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