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Short term sea level changes
tidal changes
Atmospheric air (low = rise in sea level)
Winds can increase wave height
Bristol Channel has the highest tidal range in the UK with 15m
what is thermal expansion?
ocean water warms and expands
1/3 of sea level rise is due to thermal expansion
Depth, salinity and temperature effect how much it can expand
What is eustatic change?
a rise or fall in sea level caused by a change in the overall volume of water in oceans/seas
It is a global change
What is eustatic fall?
during glacial periods water is stored on land as ice
What is eustatic rise?
end of glacial periods water is stored on land as ice
What is isostatic change?
gain or loss of land
Linked to ice ages
Glaciers and land ice weigh on the crust and pushes it downwards
As the mantle is soft and viscous it pushes mantle to other areas and causes it to uplift
Can also be caused by volcanoes creating new islands, increasing land level
What is isostatic fall?
land based ice causes earth to sag, once it melts it rebounds
What is isostatic rise?
land can sink at the coast because of the mass of deposited sediment sags the earth
Hawaii formed from a mantle plume that created multiple islands as the plate (Pacific) moved
Examples of isostatic gain/fall earthquakes
Japanese Tsunami 2011
Converging plate margin caused the coastline to drop by 2 feet
9.1 earthquake
Which part of the Uk is emerging and where is submerging?
Scotland is rising (1.5mm Isle of Arran)
South England is sinking (Cornwall -1.1 mm)
Note 
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