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CAUSES OF CLIMATE CHANGE
(c.c)
-LONG, MEDIUM AND SHORT C.C
-NATURAL AND HUMAN CAUSES
-Current c.c is unprecedented-largely
result of human activity…read more

Slide 3

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Long term c.c
ICE CORES:
· CORES REMOVED FROM ICE SHEETS REVEAL
LAYERS GOING DOWN THROUGH THE ICE
· TRAPPED AIR BUBBLES IN THE ICE CONTAIN
ATMOSPHERIC CARBON DIOXIDE
· THE ICE PRESERVES RECORD OF OXYGEN
ISOTOPES
· ATMOSPHERIC CARBON DIOXIDE ARE HIGHER
NOW…read more

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OCEANS:
· OCEANS ACT AS CARBON DIOXIDE SINKS
· REMOVING C.D FROM ATOMOSPHERE
· EVAPORATION IS VITAL=CLOUD FORMATION
· + MAINTAINING PERCIPATATION LEVELS
· DEEP OCEAN CURRENTS FORM
THERMOHALINE CIRCULATION which flows
between the oceans…read more

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Evidence of long term climate change:
CARBON DIOXIDE LEVELS:
HOW THE TECHNIQUE WORKS?
· SAMPLED FROM BUBBLES TRAPPED IN ICE
CORES
· FROM GREENLAND & ANTARTICA
· ALLOWS TIME FOR A SERIES OF C.D LEVELS IN
ATMOSOPHERE TO BE RECONTRUCTED…read more

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PAST CLIMATE?
· VARIED BETWEEN 180PPM & 280PPM OVER
THE LAST 800,000 YEARS
RELIABLILITY?
· NUMBER OF C.D SEQUENCES THAT
CORRELATE WELL WITH EACH
OTHER=RELIABLE…read more

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