Ozone hole: record in 2021 for size and duration

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Ozone hole: record in 2021 for size and duration

"Both Antarctic ozone holes of 2020 and 2021 were quite large and exceptionally long-lasting. These two exceptionally prolonged and consecutive episodes are not an indicator that the Montreal Protocol is not working, as, without it, would have been even more extensive.

Interannual variability due to weather and dynamic conditions can have a significant impact on the size of the ozone hole, overlapping with long-term recovery. CAMS also monitors the amount of UV radiation they reach. the Earth's surface, and in recent weeks we have observed very high UV indices in some areas of Antarctica located under the ozone hole.

The data collected, together with our forecasts, allow us to monitor the ozone season and compare the its development with that of the last 40 years. " These are the words of Vincent-Henri Peuch, director of Copernicus Atmosphere Monitoring Service, to explain what happened over Antarctica in 2020 and 2021 due to the ozone hole.

As reported by our colleagues at Greenme.it, in fact, the 2021 ozone hole is one of the largest and longest ever measured, according to Copernicus Atmosphere Monitoring Service. Copernicus scientists said: "Substances containing chlorine and bromine accumulate within the polar vortex where they remain chemically inactive in the dark.

The temperatures that occur in the vortex can drop below -78 degrees Celsius and the formation of ice crystals in polar stratospheric clouds, which play an important role in chemical reactions. When the sun rises above the pole, solar energy releases chemically active chlorine and bromine atoms into the vortex which rapidly destroy ozone molecules, causing the formation of the hole."

Climate crisis: Polar bears migrate from Alaska to Russia due to the heat

The polar bear is the largest land-based carnivore on the planet.

Primacy he shares with the Kodiak bear. It can exceed 450 kilograms in weight and touch over three meters in length. A species considered vulnerable, it survives in Greenland, Canada, Svalbard Islands, Alaska and Russia. The extreme temperatures measured in Alaska between December 25 and 26 reached 19.4 degrees on Kodiak Island.

Something that had never been seen before. Polar bears, starved for lack of prey and above all ice, are now migrating to new territories, moving from Alaska to Russia. Guide Herman Ahsoak said to Telegraph: "At the end of the 1990s we had at least 127 in our territory.

So much so that they even had a patrol dedicated to surveillance of villages and cities. When the ice started to disappear, we stopped seeing them so often. like in the past. I think there is still a healthy population of bears but most of them have moved.

" According to Russian researchers, the specimens arrived from Alaska are in good health, perhaps even larger in size. Some specimens of polar bears therefore arrived in Russia in the Chukchi Sea, or on the Wrangel Island.