更多冰川融化

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就在去年 12 月,在美國地球物理聯合會年會上提出的研究結果表明,與普遍看法相反,由於西南極冰蓋(WAIS)變薄而引起的海平面變化可能不會構成任何真正的威脅。然而,這種論斷究竟有多可靠仍不清楚。根據今天發表在《科學》雜誌上的一份報告,松島冰川(PIG)——西南極冰蓋最大的冰川——正在以驚人的速度萎縮,這將使其在 600 年內漂離西南極洲。

根據 1992 年至 1999 年的衛星資料,倫敦大學學院的安德魯·謝潑德和他的同事估計,松島冰川的質量每年減少約 40 億噸,導致海平面上升 0.01 毫米。儘管這本身相對來說是微不足道的,但它可能為了解西南極冰蓋內部更大規模發生的事情提供見解。松島冰川變薄的原因尚未完全瞭解,但全球變暖很可能在其中發揮作用。(整個西南極冰蓋的融化可能導致海平面上升約五米,淹沒沿海地區。)“我們首次監測到了這種變化,”謝潑德告訴路透社。“現在對我們來說重要的是繼續對其進行建模。”

Kate Wong is an award-winning science writer and senior editor at 大眾科學 focused on evolution, ecology, anthropology, archaeology, paleontology and animal behavior. She is fascinated by human origins, which she has covered for more than 25 years. Recently she has become obsessed with birds. Her reporting has taken her to caves in France and Croatia that Neandertals once called home, to the shores of Kenya's Lake Turkana in search of the oldest stone tools in the world, to Madagascar on an expedition to unearth ancient mammals and dinosaurs, to the icy waters of Antarctica, where humpback whales feast on krill, and on a "Big Day" race around the state of Connecticut to find as many bird species as possible in 24 hours. Kate is co-author, with Donald Johanson, of Lucy's Legacy: The Quest for Human Origins. She holds a bachelor of science degree in biological anthropology and zoology from the University of Michigan. Follow Wong on X (formerly Twitter) @katewong

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