We think back in the glacial, from the analysis we've made in the corals, that the deep part of the Southern Ocean was very rich in carbon, and there was a low-density layer sitting on top.
在分析了珊瑚之后， 我们认为，在冰川期时， 南极洋的深处碳元素非常丰富， 并且一层低密度海水浮在大洋表面。