冰芯

从钻头中提取的冰芯样本

冰芯是从冰盖或高山冰川中提取的岩芯樣本。由于這些冰是由每年积雪层层累积形成的，因此下层冰比上层冰更古老，冰芯中有不同年份形成的冰。冰芯中的杂质可能因地理位置而异。沿海地区更容易含有來自海洋的物质，例如海盐离子。格陵兰的冰芯中含有黃土层。

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