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The Arctic Circle Is Shrinking:
Posted on: August 7, 2024 at 15:21:39 CT
JeffB MU
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https://science.howstuffworks.com/nature/climate-weather/atmospheric/10-spots-to-watch-auroras.htm
Nothing lasts forever. Slowly but surely, Earth's axial tilt is changing — and with it, the Arctic Circle. Every 40,000 years or so, this crucial tilt shifts from an angle of 22.1 degrees to a sharper 24.5-degree incline.
Right now, we're in the middle of one such cycle. While that's going on, the boundary line that defines the Arctic Circle retreats about 46 to 49 feet (14 to 15 meters) northward per year.
Remember Grimsey Island, the Icelandic outcrop we mentioned? Well, scientists project that the Arctic Circle will leave the island behind by about the year 2050. Locals are using a concrete ball weighing about 8.9 tons (8.16 metric tons) to mark its progress. Year by year, the sphere has moved to keep pace with the Arctic's receding circle.
Nothing lasts forever. Slowly but surely, Earth's axial tilt is changing — and with it, the Arctic Circle. Every 40,000 years or so, this crucial tilt shifts from an angle of 22.1 degrees to a sharper 24.5-degree incline.
Right now, we're in the middle of one such cycle. While that's going on, the boundary line that defines the Arctic Circle retreats about 46 to 49 feet (14 to 15 meters) northward per year.
Remember Grimsey Island, the Icelandic outcrop we mentioned? Well, scientists project that the Arctic Circle will leave the island behind by about the year 2050. Locals are using a concrete ball weighing about 8.9 tons (8.16 metric tons) to mark its progress. Year by year, the sphere has moved to keep pace with the Arctic's receding circle.
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The Arctic Circle Is Shrinking: - JeffB MU - 8/7 15:21:39