New Theory Explains Ancient Antarctic Glaciation

新理論解釋古代南極冰川作用

更新於: 2026年8月26日 上午02:45

For decades, scientists believed that dropping carbon dioxide levels were the only cause of the East Antarctic Ice Sheet forming 34 million years ago.

數十年來,科學家一直認為二氧化碳濃度下降是 3400 萬年前東南極冰原形成的主要原因。

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However, a groundbreaking study published in Science in July 2026 offers a new perspective: geological 'preconditioning.'

然而,2026 年 7 月發表在《科學》期刊上一項開創性的研究提供了新的視角:地質「預處理」。

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During the Jurassic Period, the breakup of continents triggered slow-moving 'mantle waves' that traveled beneath Antarctica.

在侏羅紀時期,大陸分裂引發了移動緩慢的「地函波」,並在南極洲下方傳播。

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These waves stripped material from the crust, causing the continent to rise significantly.

這些波帶走了地殼中的物質,導致大陸顯著隆起。

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This uplift pushed the Gamburtsev Mountains to heights over 2 kilometers, creating a cold, high-altitude plateau.

這種抬升作用將甘伯特夫山脈推升至超過 2 公里的高度,創造出一個寒冷的高海拔高原。

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Even while the global climate remained relatively warm, these peaks reached a 'critical elevation' where snow could persist year-round.

即使在全球氣候相對溫暖的時候,這些山峰也達到了「臨界高度」,使積雪能夠終年不化。

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Once glaciers formed, they triggered a cooling feedback loop—the albedo effect, where ice reflects sunlight, further lowered temperatures.

一旦冰川形成,它們便觸發了冷卻的反饋迴圈,即「反照率效應」——冰層將陽光反射出去,進一步降低了氣溫。

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文章閱讀結束

你閱讀了 7 句重點內容。

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What primary factor did scientists previously believe was solely responsible for the formation of the East Antarctic Ice Sheet?

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正確答案

Declining atmospheric CO2 levels.

What role did 'mantle waves' play in the glaciation of Antarctica?

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正確答案

They caused tectonic uplift that raised the continent's elevation.

Why were the Gamburtsev Mountains critical to the formation of the ice sheet?

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正確答案

They reached an altitude where temperatures were low enough for snow to accumulate.

What is the 'albedo effect' mentioned in the article?

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正確答案

The process where bright ice reflects sunlight, contributing to cooling.

How does this new theory explain the difference between Antarctica and the Arctic?

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正確答案

Antarctica was physically lifted into a colder climate zone by geological processes.

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