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Frozen Sea?!

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Frozen Sea?!

DraigFlag87

DraigFlag87

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Just wondering at what temperature does salt water freeze? The sea is a 5 minute drive from here and on Sunday i headed down the estuary to find the sea full of huge ice bergs! It had literally frozen over and then broken up where the tide had been moving! Must have been pretty cold, it was -8 Celsius this morning when i got to work.

I also went to a huge lake in the forest, the ice was so thick, we were walking, jumping even trowing rocks on it, which unless you know is 100% safe, DO NOT ATTEMPT, IT'S EXTREMELY DANGEROUS! We could see the ice was about 4 to 6 inches thick as it was crystal clear.
 

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Where is this? I think you'll probably find that the ice has probably come from the river that flows into the estuary. I wouldn't think the Irish sea or the Atlantic (I'm guessing you mean Atlantic) would be cold enough to give sea ice just yet especially with tides and so on. But of course I could be wrong as I'm no sea ice expert ;)
 
+1. said:
sea water starts to freeze about -2
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Just to add to that it needs to be bloody cold for the sea to freeze as convection in the water will mean that warmer water will continually rise to the surface stopping the water from freezing for a while.

Hellcat said:
Add an impurity, lower the freezing point, raise the boiling point.
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Rather. Hence adding glycol to water stops it boiling at 100 degrees C
 
tim1989 said:
:eek:Well some of us spend our time at school sleeping:cool:
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Fixed your post for you. Just remember school is important, if you can't speel fing properli in ur cv employers will think ur not smart enuff to work 4 them. There endeth the lesson from the Australian who is 25 going on 80 :)
 
not related to sea water but the canal next to me is completely frozen too. its thick enough to walk on even though i wouldnt reccommend it either but my brother and partner have no brains between them and did just that this afternoon.
 
306maxi said:
Where is this? I think you'll probably find that the ice has probably come from the river that flows into the estuary.
Click to expand...
It's between Dolgellau and Barmouth in North Wales. You could be right, it could be that the river meets the sea here so the ice is from the frozen river rather than the sea freezing...? Still, must be cold for such a wide, fast moving, tidal river to freeze?
 
whiterose said:
not related to sea water but the canal next to me is completely frozen too. its thick enough to walk on even though i wouldnt reccommend it either but my brother and partner have no brains between them and did just that this afternoon.
Click to expand...

On a similar note I actually wish some relevant authority would actually come out and say "this particular lake is safe to go on, this one isn't" and so on. The reality is that some of the lakes are safe to go on and people realise this and then others see people doing this and think their lake must be safe and the media are only scaremongering which they are to an extent..... from what I've heard some of the lakes have so much ice on them you could drive a car on them fairly safely.

DraigFlag87 said:
It's between Dolgellau and Barmouth in North Wales. You could be right, it could be that the river meets the sea here so the ice is from the frozen river rather than the sea freezing...? Still, must be cold for such a wide, fast moving, tidal river to freeze?
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Well when the tide pushes the water up the river the flow slows right down ;) Of course when the tide goes down the flow increases and the ice breaks up :) Might have to go to Conwy on the weekend and see what's happening there :)
 
tim1989 said:
its only water so should freeze at 0 dont see why it would change just becouse its got salt in it
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Im sorry you've already been owned but ROFL.... sorry. Why do you think the sea doesn't freeze when its cold but has to be VERY cold in excess of -5*c and below usually.

I think the windchill was peaking around -30*c last night so not surprised its frooze bits of the sea lol.
 
Even though it is very cold it has to extremely cold for the sea to freeze.

Water takes longer to cool down and warm up in coastal areas. Therefore in the winter it takes longer for the sea to cool down and in the summer takes longer to warm up (hence why british seas are quite cool till about Sept/Oct.)

If you have a look at weather forecasts you will see that coastal regions are often warmer in winter than inland and colder in summer.
 
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