数值结果表明，在融化区上部发生较强烈的自然对流，融化界面与水平线倾角随融化时间越来越大。
Numerical results show that natural convection is strong on the top of the melting region and angle between melting interface and horizon increases with melting time.
它显示了其在永久冰冻区之上的表面由于多次冰冻和融化已经成为多边形的冰板。
They show a surface broken into polygonal slabs by repeated freezing and thawing of the sort that happens above permafrost.
北极区也就是要关注的焦点所在，因为冰层融化的速度快得令人担忧。
This has focused world attention on the polar regions, whose ice is melting at an alarming rate.
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