Jiangsu Provincial Key Laboratory of Geographic Information Science and Technology;
Nanjing University;
Nanjing 210023;
China;
School of Geographic and Oceanographic Sciences;
Nanjing University;
Nanjing 210023;
China;
Collaborative Innovation Center of Novel Software Technology and Industrialization;
Nanjing 210023;
China;
Navigation College;
Dalian Maritime University;
Dalian 116026;
China;
sea; ice; open; water; area; chlorophyll; a; net; primary; productivity; Arctic;