No ice cover on lake Öskjuvatni is causing some interest. This is clearly seen on satellite images from NASA on 2 April 2012.
Öskjuvatn is the dark spot just to the north-east of the center of the country. Image from 2 April 2012 (NASA Rapidfire).
There aren’t that many possible explanations. It seems unlikely that weather plays a crucial role, other lakes are ice covered that should experience similar conditions. That leaves increased geothermal activity as the most likely explanation. The lake is 220 m deep, so increase in geothermal activity takes a while to show on the surface.
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