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1998. This polygon shapefile contains ice observations in the Arctic region for September 9, 1998. This layer is part of the Arctic Climate System (ACSYS... Arctic Climate System (ACSYS).
1999. This polygon shapefile contains ice observations in the Arctic region for September 9, 1999. This layer is part of the Arctic Climate System (ACSYS... Arctic Climate System (ACSYS).
2002. This polygon shapefile contains ice observations in the Arctic region for September 9, 2002. This layer is part of the Arctic Climate System (ACSYS... Arctic Climate System (ACSYS).
2004. Instituto Nacional de Estadística, Geografía e Informática (Mexico), Geological Survey (U.S.), and Canada Centre for Remote Sensing. This polygon shapefile shows the approximate extent of marine areas in the Arctic covered by permanent polar ice. The data originated from the Cana... Geological Survey (U.S.).