Danish Sea Ice Maps from Early 20th Century
February 20, 2016
The Danes know ice, and in the early 20th century, there was enough traffic of merchant, military, and fishing boats in the arctic to have a reasonable, first-hand observation view of ice extent in the arctic, from the Danish Meteorological Institute – which can be downloaded here. Simple enough to compare to recent satellite measures.
Amaze your friends and neighbors!
The animation is drawn from the Danish Meteorological Institute’s sea ice maps for August in each year from 1920 to 1939. The red marks show actual records of ice conditions and the white area is the inferred ice extent. The last image is the US National Snow and Ice Data Center’s satellite-derived sea ice concentration image for August 2012.
Current ice from NSIDC: