857708
Sea Level Change
- Sea level varies on a daily basis, with onshore winds and low pressure
atmospheric systems causing temporary sea level rise. Sea level is rising at 2mm
per year which will increase the frequency and severity of flooding.
- EUSTATIC
- global effects caused by change in the volume of water
in the sea
- As climate becomes cooler, an
increase of water is stored as snow
and ice, slowing the hydrological
cycle. Sea level falls - eustatic fall.
- An increase in temperature will
result in sea level rise due to
meltwater and thermal expansion.
- As the climate begins to get warmer, the ice masses melt,
replenishing the sea water store, and sea level rises (eustatic
change) Flooding will occur producing submergant feaures
such as rias and fjords.
- global effects caused by change in the volume of water
in the sea
- ISOSTATIC
- regional effects caused by vertical movement of
land relative to sea; downwards movement of land
causes relative SL rise whereas upwards
movement causes SL fall.
- The weight of ice causes land to sink; it
moderates in some areas the eustatic
sea level fall.
- Isostatic rebound can continue for 1000s of years after
an ice sheet is removed
- As ice is removed, land moves
back to previous levels (isostatic
readjustment). If isostatic movment
is faster than eustatic, emergant
features are produced such as
raised beaches. An example is the
SE of the UK is sinking whilst the
NW is rising. Ice sheets were
thickest in N Scotland.
- regional effects caused by vertical movement of
land relative to sea; downwards movement of land
causes relative SL rise whereas upwards
movement causes SL fall.
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