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Politics : Formerly About Advanced Micro Devices -- Ignore unavailable to you. Want to Upgrade?

To: Brumar89 who wrote (943100)

6/27/2016 3:11:07 PM

From: Wharf Rat

Respond to of 1575422

Danish Sea Ice Maps from Early 20th Century
February 20, 2016

Animated.

I’ve had these on my hard drive for years, can’t believe I never thought to make the animation. Now someone has. Here it is.

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!

Gerg’s Net:

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.

There’s also the historical sea ice extent compilation by Walsh and Chapman at the US National Center for Atmospheric Research / University of Illinois (as plotted at Cryosphere Today):

More Below.

Current ice from NSIDC: