Greenland and Antarctic ice
cores from ice sheetsare the
best evidence for long term.
East Antarctic core shows the
climate of the last 800,000
years.
Bubbles in the ice contain atmospheric
CO2 and the ice preserves oxygen
isotopes.
Key Terms
Climate Change - any long term trend or
shift in climate detected by a sustained shift
in the average value for any climatic event.
Thermohaline circulation - System of
surface and deep water ocean currents
driven by temperature and salinity
differences between areas of the ocean.
Little Ice Age (1400-1850) - A
cool period in Europe. Many
Alpine glaciers advanced.
Thermal expansion - Increased
volume of the seas due to higher water
temperature. Causes sea level rise.
Climate forcing - Any mechanism that
alters the global energy balance and
'forces' the climate to change in response.
e.g.change in Earth's orbit or axis