AstroGypsies

Pink Lake, Gatineau park. Pink Lake is meromictic, meaning that its upper and lower layers of water never mix. Normally a lake’s water layers mix completely each year during the spring and fall, because of water density, water and air temperature, and the wind. The mixing of lake waters distributes nutrients and oxygen evenly throughout the lake. Pink Lake’s waters do not mix, because it has a small surface and bowl-like shape, and is surrounded by steep cliffs that protect it from the wind. There is no oxygen in the deepest seven metres of the lake.