美国科学家称北极冰层今夏可能完全融化

(2009-05-03 21:53:45)

  中新网6月29日电 美国科学家最近说,北极今年夏天可能出现冰层完全融化的奇景,这在人类历史上是没有前例的。

  据新加坡《联合早报》报道,美国科罗拉多州国家雪冰资料中心的塞雷兹指出:“今年夏天结束时,北极可能会没有冰……原因在于,北极地区目前覆盖着的冰层非常薄,我们称这种(形成才一年的)冰为‘首年冰’,这种冰一般会在夏天融化。”

  如果北极冰今年夏天完全融化,这将是人类历史上的第一次。

  塞雷兹认为,发生这情况的可能性有50%;如果真的在9月发生的话,到时候船只也许就可以从阿拉斯加直接航行到北极。他指出,即使北极没有冰,北冰洋其他地区今年夏天还是会有冰层。但他坦承,北极出现短暂的无冰状态对人类具有象征意义,并再次印证全球暖化会对环境造成改变。

  塞雷兹说:“北极原本应该有冰,但是今年夏天冰层却可能融化,这是在告诉我们,地球出问题了。”他指出,早在几年前,科学家还预测,要到2050年至2100年才会出现北极完全无冰的情况;以他个人而言,五年前,他也绝没想到这一现象今年夏天就要发生。

  北极冰一般在6月中开始融化,9月中最薄,然后再开始冻结,在来年3月时形成最厚的冰层。

  塞雷兹说,去年夏天9月中,北极冰层融化了23%,打破了2005年的纪录,是“我们在卫星纪录中看到的最少海冰,也许是一个世纪以来最少的”。

  但专家也指出,从积极方面来看,北极冰融化将为全球提供另一条通往巴拿马运河的航道,同时让人们更容易抵达拥有丰富资源的地区。

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