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, 1978 - 2019.

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）被定义为给定海冰年度内，海冰扩展日与消退日之间的时长。该海冰年度始于2月中旬（南大洋夏季海冰范围的平均最小值），并于次年2月中旬结束。详细信息请参见Stammerjohn等人（2008年，JGR）的相关研究。目前存在多种卫星算法。