Sea ice duration or the time elapse between day of advance and day of retreat within a given sea ice year for the PAL LTER region West of the Antarctic Peninsula derived from passive microwave satellite, 1979 - 2021.

Sea ice duration is defined as the time elapse between day of advance and day of retreat within a given sea ice year, which begins mid-February (mean minimum of summer sea ice extent for the Southern Ocean) and ends the following mid-February. See Stammerjohn et al (2008, JGR) for further details. Different satellite algorithms exist.

海冰持续时间(Sea ice duration)指给定海冰年度内，海冰扩展起始日与消融退缩日之间的历时；该海冰年度始于2月中旬（对应南大洋夏季海冰范围的平均极小值），并于次年2月中旬结束。更多细节可参阅Stammerjohn等（2008年，《地球物理学研究杂志》（JGR））。目前已有多种卫星反演算法被提出。