科學家發現了一棵古老的貝殼杉樹，它記錄了地球磁場的最後一次崩塌，而這種現象將再次發生。
紐西蘭一棵埋藏了數千年的貝殼杉樹為科學家提供了地球磁場在近乎逆轉事件期間的史無前例的記錄。
這棵古樹是在 Ngāwhā 地熱發電廠擴建期間出土的，長 65 英尺，直徑 8 英尺。放射性碳定年法表明，它生活在 41,000 至 42,500 年前，即所謂的拉尚漂移時期，當時地球的磁極有所動搖，但並未完全翻轉。
貝殼杉的年輪保存了這次磁場劇變的詳細時間線，為我們了解地球磁場變化如何影響地球提供了基礎。
在這種事件中，磁場減弱會導致宇宙輻射增加，對生命和現代技術構成威脅。
新南威爾斯大學的古氣候學家克里斯·特尼指出了這棵樹的重要性：「這棵巨大而孤獨的樹在地球歷史上一個非凡的時期生長了大約 1,700 年。
Scientists found an ancient kauri tree that captured the last collapse of Earth's magnetic field and it will happen again.
A kauri tree buried for thousands of years in New Zealand has provided scientists with an unprecedented record of Earth's magnetic field during a near-reversal event.
The ancient tree, unearthed during geothermal plant expansion in Ngāwhā, measures 65 feet long and eight feet in diameter. Radiocarbon dating reveals it lived between 41,000 and 42,500 years
ago — during a period known as the Laschamp Excursion, when Earth's magnetic poles wavered but did not fully flip.
The kauri's growth rings have preserved a detailed timeline of this magnetic upheaval, offering insights into how changes in Earth's magnetic field impact the planet.
During such events, the weakened magnetic field allows increased cosmic radiation, posing risks to life and modern technology.
Chris Turney, a paleoclimatologist at the University of New South Wales, notes the tree’s importance: “This huge, lonely tree grew for some 1,700 years during a remarkable period in Earth's history.
Image: Nelson Parker
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