https://sputnikglobe.com/20221227/study-says-chukotka-and-alaska-were-connected-only-35700-years-ago-1105812562.html
Study Says Chukotka and Alaska Were Connected Only 35,700 Years Ago
Study Says Chukotka and Alaska Were Connected Only 35,700 Years Ago
Sputnik International
Scientists studied the Bering Land Bridge formation by analyzing seabottom isotopes. It turns out the Bering Land Bridge appeared later than previously thought.
2022-12-27T09:36+0000
2022-12-27T09:36+0000
2022-12-27T09:36+0000
science & tech
bering strait
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A study discovered that the Bering Strait, which connected Chukotka and Alaska during the Last Glacial Maximum (26,500 to 19,000 years ago), emerged unexpectedly late, about 35,700 years ago. This suggests that the "bridge" between the Eurasia and North America lasted 10,000 years less than previously thought.Scientists performed isotopic analysis of marine soil samples collected from three different regions of the Arctic Ocean adjacent to Alaska and Chukotka. Modern soil layers at the bottom of the regions bordering the Bering Strait contain a large number of organic particles that sank to the bottom of the Arctic Ocean together with the waters of the Pacific Ocean that passed through the strait. During the analysis, scientists were able to determine when Pacific water flowed into the Arctic.After analyzing the data, scientists realized that the migration of people and animals in Eurasia at that time to North America took place 10,000 years later than previously thought.
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when did bering land bridge appear, chukotka and alaska were connected, bering land bridge theory
when did bering land bridge appear, chukotka and alaska were connected, bering land bridge theory
Study Says Chukotka and Alaska Were Connected Only 35,700 Years Ago
The Last Glacial Maximum is the time of maximum cooling during the last glacial epoch between 26,500 and 19,000 years ago. The level of the World Ocean at that time was 120-135 meters lower than it is now because the water accumulated as ice in the 3km to 4km thick ice sheets withdrawn from the hydrosphere.
A study discovered that the Bering Strait, which connected Chukotka and Alaska during the Last Glacial Maximum (26,500 to 19,000 years ago), emerged unexpectedly late, about 35,700 years ago. This suggests that the "bridge" between the Eurasia and North America lasted 10,000 years less than previously thought.
"It means that more than 50 percent of the global ice volume at the Last Glacial Maximum grew after 46,000 years ago. This is important for understanding the feedbacks between climate and ice sheets, because it implies that there was a substantial delay in the development of ice sheets after global temperatures dropped."
Tamara Pico
Assistant professor of Earth and planetary sciences at UC Santa Cruz
Scientists performed isotopic analysis of marine soil samples collected from three different regions of the Arctic Ocean adjacent to Alaska and Chukotka. Modern soil layers at the bottom of the regions bordering the Bering Strait contain a large number of organic particles that sank to the bottom of the Arctic Ocean together with the waters of the Pacific Ocean that passed through the strait. During the analysis, scientists were able to determine when Pacific water flowed into the Arctic.
After analyzing the data, scientists realized that the migration of people and animals in Eurasia at that time to North America took place 10,000 years later than previously thought.
