[新聞] 神秘巨洞42年後重現南極 科學家摸不著頭緒消失
神秘巨洞42年後重現南極 科學家摸不著頭緒
http://www.chinatimes.com/realtimenews/20171013002176-260408
南極冰層中心最近出現一個巨洞,大小相當於美國的馬里蘭州,這個洞42年前
就曾出現過但又離奇合上,科學家對此幾乎摸不著頭緒。
這個巨洞屬於一種冰間湖(Polynya),周遭都被海冰圍繞、常常出現在海岸邊,
但這個出現在南極的神祕冰間湖,離海岸有好幾百公里遠。
科學家首次在1974年發現這個冰間湖,當時它的規模比現在更龐大,相當於面
積約25.5萬平方公里的奧勒岡州,但1976年時這個湖突然消失,一直到2016年
美國太空總署(NASA)的衛星又拍到一個小洞,自此以來這個洞越來越大,現在
規模已經和馬里蘭州相當(面積約3.2萬平方公里)。
對許多科學家來說,這個洞的重新出現是個謎團,因為看起來就像有人用拳頭
在南極冰上打穿了一個洞。至今科學家仍無法解釋,這個洞在1970年代前是否
就曾經出現、再過40年後這個湖是否又會消失不見、產生這個巨洞的原因是否
是氣候變遷等。
https://i.imgur.com/K5jy20u.jpg


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