![]() And then when that water goes back out to sea again at the end of the tide it's a lot warmer. So I think he's absolutely right with the observationĬhris - I did quite a bit of sailing in my youth on estuarine waters and used to find the water on the outgoing tide at the end of a day was a lot warmer because the tides come in over very very hot mudflats and absorbed all the energy from the mud exactly as you're saying Jim. And so you will feel warmer and actually it is warmer but the deep well-mixed water off-shore isn't changing much at all. So the water, the shallow layer of water, that you’re splashing about in is immediately being warmed from below. You compare that to the second half of the day when you've had the whole day's sunshine heating the sand and the tide comes in over. But let's say the tide is not in yet but when the tide comes in across the cold it's just coming in comes in across the cold sand it's not warmed up. You go into the sea and your feet are cold and it feels quite chilly. The sandy beach will have cooled overnight so it'll be at its lowest temperature. So, let's say for example your going to the seaside at dawn, you've got out of your tent pulled back the door and you think yes let's go and have a swim before breakfast. So you know from your holidays in any sort of climate but particularly heat waves like the one we're having in the British Isles this summer you walk on a sandy beach and it's really hot to your bare feet and sandy soils are particularly good at gaining heat quickly and losing heat quickly. ![]() So it's very hard for energy from sunlight to penetrate deep into sand. I think we should be more talking about what the beach is like because one of the things about being at the seaside of course is that most beaches that are popular are sand and sand is very good at retaining the energy from the sun doing the day in the top few millimetres of sand grains and sand grains also have big air gaps between them so that's a good insulator. ![]()
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