Why the continental margin around the Antarctica is deeper than other continental shelves ?

南极冰盖的生长期和衰退史影响了整个新生代南极洲包括其边缘的地理形成。与世界上其他海域相比，南极洲周围大陆架的深度是很深的。南极大陆架之所以很深，是因为南极冰盖会使包括大陆架在内的大陆下沉。基于冰川均衡调整（GIA）模型，我们估计了南极冰荷载对南极洲周围大陆架深度的影响。GIA模拟结果表明，当前冰分布引起的变形不能满足该地区大陆架深度的异常。而基于末次冰旋回冰负荷模型的结果解释了南极周围的深度，并暗示末次盛冰期南极冰盖延伸至大陆架。

The growth and decay history of Antarctic ice sheet affected geographic formation of the Antarctica including its margin through the Cenozoic era. The depth of the continental shelf around the Antarctica is very deep in comparison with that of the other sea areas in the world. The reason why continental shelf of Antarctica is very deep is that the Antarctic ice sheet would depress the continent including the continental shelf. Based on the glacial isostatic adjustment (GIA) modelling, we estimate the effect of the Antarctic ice load on the depth of the continental shelf around the Antarctica. GIA modelling results show that deformation due to the present ice distribution cannot satisfy the anomaly of the continental shelf depths in this region. However, the results based on the ice load model including the last glacial cycle explain the depth around the Antarctica, and imply that the Antarctic ice sheet extent to continental shelf at the Last Glacial Maximum.