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新华社北京8月20日电美国和新西兰科学家通过分析冰川沉积物发现,东南极冰盖已稳定存在了至少20万年,预计未来将继续保持稳定。即使西南极冰盖因为气候变暖而消失,东南极冰盖也不会受到太大影响。
南极大陆由横贯南极的山脉分成东西两部分。西南极冰盖底部位于海中,对气候变化比较敏感,正在快速消融。东南极冰盖覆盖在陆地上,科学界通常认为它比较稳定,但近年来一些人提出了不同意见。
美国印第安纳大学发布的新闻公报说,该校研究人员及同行分析了横贯南极山脉中部附近的冰碛样本,确认了东南极冰盖的稳定性。冰碛是冰川所挟带和搬运的碎屑构成的沉积物,不同时期形成的沉积层记录了当时的冰川运动和气候特征。
东南极冰盖比西南极冰盖大10倍,假如它全部融化,全球海平面将上升约60米,了解其稳定性对理解气候变化的影响非常重要。研究人员在美国新一期《地质学》杂志上报告说,从冰碛体现的情况来看,将来即使气温上升使东南极冰盖边缘退却,其核心部分也不会有很大变化。
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