巨型海冰脱离南极冰架 面积堪比美国罗得岛州
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巨型海冰脱离南极龙尼-菲尔希纳冰架的过程。本图显示的分别是1月12日下午、1月13日上午和1月13日下午时的场景。
北京时间1月18日消息,据美国《生活科学》网站报道,美国宇航局“水”卫星(Aqua)和“陆地”卫星(Terra)于1月12日到13日期间,拍摄到一块比美国罗得岛州面积还要大的巨型海冰在一天之内从南极龙尼-菲尔希纳冰架上迅速脱离并解体为许多碎块的整个过程。
这块既长又窄的“冰舌”相当于一座海冰桥梁,连接A-23A冰山和西南极大陆的龙尼-菲尔希纳冰架。冰桥是一种快速冻结的冰或是不能移动的海冰,因为它总是固定在海岸附近。与冰架相比,海冰只是覆盖于海洋之上的一层薄薄的冰质外壳。
从这组卫星图片中可以看出,它们的厚度有所不同。较高较厚的龙尼-菲尔希纳冰架在由海冰构成的冰桥上留下了明显的阴影。这个特别的冰桥解体后会有规则地进行重组。
尽管这组图片显示得的仅仅是一个常规事件,但是这种壮观的场景有时在预示着南极夏天的到来
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