基于CryoSat-2卫星测高数据分析南极海冰厚度的时空变化

利用卫星测高数据能够获取大尺度、长时序的海冰厚度信息。相较于北极，目前南极海冰厚度特别是近期变化信息仍很缺乏。基于2013-2018年的CryoSat-2卫星测高数据，采用最低点高程法和静力平衡方程模型反演了近6年逐月平均海冰厚度并分析其时空变化规律。结果表明：2013-2018年南极海冰厚度整体呈现先上升后下降的趋势，其中，2014-2017年年平均海冰厚度表现为快速变薄。南极较厚的海冰集中在威德尔海西南海域，最大值出现在该海域2014年的7月（6.27 m）。年平均海冰厚度在2017年达到最低值。南极海冰厚度的时空变化研究可为深入研究海冰变化与全球变化的关系提供参考。

Spatio-temporal variation of Antarctic sea ice thickness using CryoSat-2 satellite altimeter data

Long time sea ice thickness can be obtained via satellite altimetry at a large spatial scale. Compared to the Arctic, information of the Antarctic sea ice on thickness, especially in recent changes, is still scarce. We calculated Antarctic sea ice thickness from CryoSat-2 satellite altimeter data using the minimum elevation method and the static equilibrium equation model, and analyzed the spatio-temporal variation of Antarctic sea ice thickness from 2013 to 2018. The results show that the Antarctic sea ice thickness presents the trend of first rising and then falling. The annual mean sea ice thickness decreases rapidly during 2014-2017. Thicker ice is concentrated in the southwestern of the Weddell Sea, with the maximum occurring in July 2014 (6.27 m). The annual mean sea ice thickness reaches its lowest in 2017. This study can serve as a reference for further studying the relationship between sea ice and global change.