Average monthly sea ice coverage for the PAL LTER region West of the Antarctic Peninsula derived from passive microwave, 1978 - July 2021

Monthly sea ice coverage derived from passive microwave satellite measurements. Ice extent is defined as the area bounded by the 15% ice concentration contour which is determined by summing up all the pixel areas (nominally 25km by 25km) which have concentrations greater than 15%. Sea-ice extent refers to the total surface area inside the ice-edge. This area inside the ice-edge is not necessarily covered by 100%.本数据集为源自被动微波卫星测量（passive microwave satellite measurements）的月度海冰覆盖（sea ice coverage）数据。海冰范围（ice extent）定义为以15%海冰浓度等值线为界的区域，该区域通过统计所有海冰浓度高于15%的像素面积（标称尺寸为25千米×25千米）的总和确定。海冰范围指冰缘内部的总表面积，该冰缘内部区域并非100%被海冰覆盖。