July 9, 2011 Frozen air bubbles

[Dougie]

Temp get cold. Water freezes and produces 1/2 inch of ice. Bubbles of gas from lake bottom rise and get trapped underneath the ice layer. The next night when it gets cold again, more water freezes and ice becomes thicker forming on the ice above it but not on the bubble except at the edges. The next day, more gas bubbles up getting trapped again. Repeat over many days and night all winter long..