The icy blast

The garden pond, still frozen, yesterday

The garden pond, still frozen, yesterday

We’re in the grip again of icy weather that for southern England is unusually cold.

So a second chance to see how the pond behaves in the as the weather turns chilly.

With ice covering the pond, oxygen levels are again rising – yesterday after about a day of solid ice, there was 15.3 milligrammes of oxygen in each litre of water.

This is up on the pre-freeze values but a way to go to get to the 20 milligrammes per litre I saw at the peak of the last freeze.

But in this pond in a neighbour’s garden oxygen levels are much lower – 2.5 milligrammes of oxygen in each litre of water, much closer to the levels that could pose problems.

This pond had much lower oxygen levels under the ice

This pond had much lower oxygen levels under the ice

Why the difference? I’ll come back to that soon.

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