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。
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」。
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。
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。
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。
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。
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。
