Researchers know the Arctic sedimentary history is millions of years old

Mass Amherst researchers have discovered a million -year -old Arctic sedimentary record.

Lake El’gytgyn. Yes: Mass Amherst

The new research was conducted by the University of Massachusetts Amherst and published in a journal The air of guilt, He was the first to provide constant observation of the movement of the universe, known as the Mid-Pleistocene Transition, which intrigued scientists. Kurt Lindberg, the paper’s original author and now a graduate student at the University of Buffalo, was only a graduate when he completed the research as a group of scientists. World -renowned scientist in Mass Amherst.

About 1.2 million years ago, Earth’s atmosphere, known as the Mid-Pleistocene Transition, or MPT, underwent a major change. Previously, snowy years came, usually, every 40,000 years or so. But in a short glass window of geological time, the time between ice years is more than double, every 100,000 years. “It’s a real bump,” said Isla Castañeda, a doctor of geosciences at Mass Amherst and one of the paper’s authors. “Nobody really knows why this is moving.”

One of the major barriers to understanding MPT is the limited amount of data available. The first Arctic ice cap dates back only about 125,000 years. And the old sedimentary bases are almost non -existent, because, with the passage and passing of the snow season, the movement and retreat of the ice sheets are the same as those of large bulldozers. cutting most of the land shown to the ground.

However, one place in the world, in northeastern Russia, is above the Arctic Circle and is not covered by glaciers: Lake El’gygytgyn. This included the world-renowned polar scientist, Julie Brigham-Grette, professor of geosciences at UMass Amherst and one of the paper’s co-authors.

In 2009, Brigham-Grette led a team of earth scientists to Lake El’gygytgyn, where they excavated a 685.5-meter sediment base, showing about 3.6 million years of history. the Earth. Lindberg and his colleagues used a portion of this sedimentary source that captured the MPT and searched for specific biomarkers that could help them detect temperature and vegetation. With this knowledge, they were able to reconstruct, for the first time, climactic conditions in the Arctic during the MPT.

While the team hasn’t solved the mystery of the MPT, they have done some amazing things. For example, the interglacial period, or low snowfall, called MIS 31 seems to be very hot – and reports from Lake El’gygytgyn show that the temperature is too low. just low. However, the other three interglacial periods, MIS 21, 27 and 29 were warmer and warmer. Finally, the group’s research shows a long -lasting dryness pattern in MPT.

“It couldn’t have been done without Lindberg’s interest,” Castañeda said. “I’ve had a lot of low -level students in my lab, and I want to work with them. Kurt left with this program, and he’s done well.”

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More information:
Kurt R. Lindberg et al, Biomarker Proxy Records of Arctic Climate Change during the Mid-Pleistocene Transition from Lake El’gygytgyn (Far East Russia), Climate of the past (2021). DOI: 10.5194 / cp-2021-66

Presented by the University of Massachusetts Amherst

Directions: Researchers (2022, March 30) found (2022, March 30) retrieved March 30, 2022 from sedimentary-climate-mystery. html

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