澳大利亚科学家找到证据表明,南极海冰在过去50年中减少了20%。科学家使用新的检测方法对1840年以来南极海冰的变化进行了研究。结果显示,在上个世纪50年代前南极海冰基本没有变化,但自50年代开始海冰开始迅速减少。新的方法主要是探测冰芯采样中的甲基磺酸成分。南极海冰中的 Australian scientists have found evidence that Antarctic sea ice has decreased by 20% in the past 50 years. Scientists used new detection methods to study changes in Antarctic sea ice since 1840. The results showed that there was little change in sea ice in Antarctica before the 1950s, but since the 1950s sea ice began to decline rapidly. The new method is mainly to detect the methanesulfonic acid component in the ice core sampling. Antarctic sea ice