備註請放最後面 違者新聞文章刪除 1.媒體來源: 外媒 sciencealert 2.記者署名: Michelle Starr 3.完整新聞標題: Giant Gravity Anomaly Under Antarctica Is Getting Stronger, Scientists Reveal 科學家揭示：南極洲下方的巨大重力異常正在增強 4.完整新聞內文: Giant Gravity Anomaly Under Antarctica Is Getting Stronger, Scientists Reveal Nature 19 February 2026 By Michelle Starr https://i.urusai.cc/IQYuz.jpg Giant Gravity Anomaly Under Antarctica Is Getting Stronger, Scientists Reveal The Antarctic Geoid Low. (GReD) Although Earth is approximately spherical, its gravity field doesn't adhere to the same geometry. In visualizations, it more closely resembles a potato, with bumps and divots. One of the strongest of these depressions – where the gravity field is weaker – lies under Antarctica. Now, new models of how the so-called Antarctic Geoid Low evolved over time have shown that it's only getting stronger, driven by the long, slow movement of rock deep below Earth's surface, like a giant shifting in its sleep. 科學家揭示：南極洲下方的巨大重力異常正在增強 自然 2026年2月19日 經過米歇爾·斯塔爾 科學家揭示：南極洲下方的巨大重力異常正在增強 南極大水準面低點 （GReD） 雖然地球近似球形，但它的引力場並不遵循同樣的幾何形狀。在可視化圖中，它更像一個 馬鈴薯，表面凹凸不平。 在這些低窪地帶中，重力場較弱的地帶之一位於南極洲下方。如今，關於所謂「南極大水 準面低窪地帶」隨時間演變的新模型表明，它正變得越來越強，這是由地球深處岩石緩慢 而漫長的運動驅動的，就像一個沉睡的巨人在翻身。 "If we can better understand how Earth's interior shapes gravity and sea levels, we gain insight into factors that may matter for the growth and stability of large ice sheets," says geophysicist Alessandro Forte of the University of Florida. Earth's geoid – the bumpy potato shape of the gravitational field – is uneven because gravity is linked to mass, and the mass distribution inside the planet is uneven, due to different rock compositions having different densities. 「如果我們能夠更好地了解地球內部如何塑造重力和海平面，我們就能深入了解可能對大 型冰蓋的增長和穩定性產生重要影響的因素，」佛羅里達大學地球物理學家亞歷山德羅· 福特說。 地球的大地水準面—重力場凹凸不平的馬鈴薯形狀—是不均勻的，因為重力與質量有 關，而地球內部的質量分佈不均勻，這是由於不同岩石成分的密度不同造成的。 https://youtu.be/iCptIGM1cg8 It's not a huge difference that you'd notice at the surface. Maps tend to exaggerate it so we can see what's going on; if you weighed yourself at a geoid low and a geoid high, the difference would be just a few grams. Nevertheless, the geoid represents a window into processes deep inside Earth that we can't observe directly. Forte and his colleague, geophysicist Petar Gliviof the Paris Institute of Earth Physics in France, generated a detailed map of the Antarctic Geoid Low using another window into Earth's interior: earthquakes. Seismic waves from earthquakes travel through the planet, changing speed and direction as they encounter materials with different compositions and densities. "Imagine doing a CT scan of the whole Earth, but we don't have X-rays like we do in a medical office," Forte explains. "We have earthquakes. Earthquake waves provide the 'light' that illuminates the interior of the planet." 表面上看，這種差別並不大。地圖往往會誇大這種差別，以便我們能看清地形；如果你分 別在大地水準面低點和高點稱重，差別可能只有幾克。 然而，大地水準面為我們了解地球內部我們無法直接觀測到的過程提供了一個窗口。 福特和他的同事，法國巴黎地球物理研究所的地球物理學家彼得·格利索維奇，利用地球 內部的另一個窗口—地震，繪製了一幅南極大水準面低窪區的詳細地圖。地震產生的地震 波在地球上傳播，遇到不同成分和密度的物質時，其速度和方向都會改變。 「想像一下對整個地球進行CT掃描，但我們沒有像診所裡那樣的X光設備，」福特解釋。 “我們依靠的是地震。地震波提供的‘光’照亮了地球內部。” Using the earthquake data, the researchers constructed a 3D density model of Earth's mantle and extrapolated it into a new map of the entire planetary geoid. They compared this map with the gold-standard gravity data collected by satellites and found it to be a close match. That was the easy part. The next step was to try to turn back the clock to assess how the geoid has evolved since the early Cenozoic, 70 million years ago. Forte and Glivifed their map into a physics-based model of Earth's mantle convection, rewinding Earth's interior geological activity to see how the geoid evolved over that timeframe. Then, from their starting point, they let the model run forward to see if it could reproduce the geoid we see today. 研究人員利用地震資料建構了地球地函的三維密度模型，並將其外推繪製成一張全新的行 星大地水準面圖。他們將這張地圖與衛星收集的黃金標準重力數據進行了比較，發現兩者 高度吻合。 那隻是最簡單的部分。下一步是嘗試追溯時間，評估自新生代早期（7000萬年前）以來大 地水準面的演進過程。 Forte 和 Glivi將他們的地圖輸入到基於物理的地球地函對流模型中，回溯地球內 部的地質活動，以觀察大地水準面在該時間段內的演變情況。 然後，他們從起點出發，讓模型向前運行，看看它是否能夠重現我們今天看到的地球大地 水準面。 They also checked whether their model reproduced real changes in Earth's rotational axis known as True Polar Wander. It arrived at the current geoid and matched the polar wander, suggesting it also provides an accurate representation of the geoid's evolution. The results showed that the Antarctic Geoid Low is not a new development; a gravitational depression has been sitting near Antarctica for at least 70 million years. But it hasn't remained static. About 50 million years ago, its position and strength started to change dramatically – timing that matches a sharp bend in the polar wander. According to the model, the anomaly formed as tectonic slabs subducted beneath Antarctica and sank deep into the mantle, altering the planet's gravity field at the surface. Meanwhile, a broad region of hot, buoyant material rose upward, becoming more influential over the past 40 million years and strengthening the geoid low. 他們也檢驗了他們的模型是否能重現地球自轉軸的真實變化，也就是真極移。結果顯示， 該模型推導出了當前的大地水準面，並且與極移相符，這表明它也能準確地描述大地水準 面的演變過程。 研究結果表明，南極大水準面低窪地帶並非新近形成；至少在7,000萬年前，南極附近就 一直存在著一個重力 低窪區。但它並非一成不變。大約5000萬年前，它的位置和強度開 始劇烈變化—這個時間點與極移的急劇變化相吻合。 根據該模型，這種異常現象的形成是由於構造板塊俯衝到南極洲下方並沉入地函深處，改 變了地表的重力場。同時，一大片高溫高浮力物質向上上升，在過去4000萬年中影響力不 斷增強，並強化了大地水準面低窪區域。 Interestingly, this may be linked to the glaciation of Antarctica, which began in earnest around 34 million years ago. It's only a speculative link, but here's the interesting thing about the geoid: it shapes sea level. So, as the geoid shifted downward around Antarctica, the local sea surface would have lowered with it – potentially influencing the growth of the ice sheet. That's obviously a hypothesis that requires further testing. However, the work does show that different geodynamic processes, from mantle convection to the geoid to the motion of the poles, can all be connected and influence each other. The gravity hole under Antarctica may be subtle, but it is a reminder that even the slowest processes deep inside Earth can leave a lasting impression on the world above. The research has been published in Scientific Reports. 有趣的是，這可能與南極洲的冰川作用有關，南極洲的冰川作用大約始於3,400萬年前。 這只是一個推測性的聯繫，但大地水準面的一個有趣之處在於：它會影響海平面。因此， 當南極洲周圍的大地水準面向下移動時，當地的海平面也會隨之下降——這可能影響了冰 蓋的成長。 這顯然是一個需要進一步驗證的假設。然而，這項研究確實表明，從地函對流到大地水準 面再到極點運動，不同的地球動力學過程都可以相互連結並相互影響。 南極洲下方的重力空洞可能很細微，但它提醒我們，即使是地球深處最緩慢的過程，也能 對地上世界留下持久的影響。 這項研究成果已發表在《科學報告》。 5.完整新聞連結 (或短網址)不可用YAHOO、LINE、MSN等轉載媒體: https://reurl.cc/GGW8j3 6.備註: IT'S OVER https://i.urusai.cc/Hdylt.jpg ADAM RUINED EVERYTHING 禮成奏樂 https://youtu.be/AuJgbOQqjK8 順帶一提，2026年2月17日（農曆正月初一）南極發生日蝕，至於有什麼東西醒來？ 還需要等待南極科考團的進一步回報。 https://youtu.be/xvpBDopIMxw -- http://www.youtube.com/watch?v=m-QXmqX7k8Q 劉德華 悟 電影【新少林寺】主題曲 https://youtu.be/dLRLWy7bKS4 作曲：趙欽 作詞：劉德華 《金剛總持祈請文》 編曲：Adam Lee．飾墜．陳德建 蔣巴桑波 (第七世噶瑪巴確扎嘉措之根本上師) 著 監製：陳德建．李安修 不要把金王冠織入鳥巢中 招惹微風與獵槍是不明智的 依常斷見所立宗 能壞慧命因緣法 精勤十善一夜盡 縱生天人多闡提 -- ※ 發信站: 批踢踢實業坊(ptt.cc), 來自: 122.116.197.27 (臺灣) ※ 文章網址: https://www.ptt.cc/bbs/Gossiping/M.1771492084.A.697.html