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Author Topic: What causes a "sea breeze"? Is it a real phenomenon?  (Read 5402 times)

Offline chris

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"Boaty" types often talk about a "sea breeze" appearing as the day warms up. Is this real, or just a load of hot air?!

Chris


 

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What causes a "sea breeze"? Is it a real phenomenon?
« Reply #1 on: 23/08/2009 10:38:18 »
It's real. The land warms and cools faster than the sea (water has a very large heat capacity).
When the sun rises it heats the land faster than the sea so the land gets hotter. This warms the air over it and so it rises. The rising air is replaced by air drawn from over the sea and so you get a breeze blowing from the sea onto the land.

This page
http://en.wikipedia.org/wiki/Sea_breeze
has pictures and stuff too.
 

Offline Variola

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What causes a "sea breeze"? Is it a real phenomenon?
« Reply #2 on: 23/08/2009 18:58:03 »
I live by the sea, and can vouch for the existence of a sea breeze, being more prevalent  later on in the day.

It is very pleasant on a hot day like today  :)
 

Offline DrChemistry

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What causes a "sea breeze"? Is it a real phenomenon?
« Reply #3 on: 23/08/2009 20:04:39 »
"Boaty" types often talk about a "sea breeze" appearing as the day warms up. Is this real, or just  a load of hot air?!

You are quite right! :D It's a load of hot air rising up.

I used to live by the sea, and just as Variola, I can vouch for the existance :)
 

Offline JnA

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What causes a "sea breeze"? Is it a real phenomenon?
« Reply #4 on: 24/08/2009 02:29:48 »
You should also do some reading on the 'Fremantle Doctor'
 

Offline graham.d

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What causes a "sea breeze"? Is it a real phenomenon?
« Reply #5 on: 24/08/2009 12:54:13 »
It also reverses as it gets dark when the land cools down faster than the sea. In mountainous areas the higher land can cool rapidly and the cold air pour down the mountain and out to sea. These winds, called katabatic winds, can be very strong indeed and appear very suddenly.
 

dnwx

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What causes a "sea breeze"? Is it a real phenomenon?
« Reply #6 on: 28/08/2009 13:04:59 »
For a sea breeze to become established the geostropic wind has to be weak, say, less than 10 knots. The clear or relatively clear sky enables the land to become warmer than that of the sea, this causes the temperature over the land to greatly exceed that of the sea.

The vertical expansion causes pressure gradients to form higher above the lands surface. Because more air will lie above "a given level" than before the expansion. The pressure rise over the land will cause such a gradient that the air will flow gently and smoothly towards the sea. The removal of that air causes a fall in pressure over the land at sea level, and a rise over the sea. A pressure gradient developes and and the sea air begins to flow landward.

land air moves out to see and is sent back to the land. this process continues until night time by radiational cooling or at such time when the geostropic wind picks up.
 

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What causes a "sea breeze"? Is it a real phenomenon?
« Reply #6 on: 28/08/2009 13:04:59 »

 

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