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Federal
Arctic Sea Ice Charts from Danish Meteorological Institute, 1893 - 1956, Version 1
National Aeronautics and Space Administration —
These charts, created by the Danish Meteorological Institute (DMI), provide observed and inferred sea ice extent for each summer month from 1893 to 1956. From 1893 to... -
Federal
Submarine Upward Looking Sonar Ice Draft Profile Data and Statistics, Version 1
National Aeronautics and Space Administration —
This data set consists of upward looking sonar sea ice draft data collected by submarines in the Arctic Ocean. It includes data from both U.S. Navy and Royal Navy...