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SUMMARY:Ice- not just H2O: The Chemistry of Ice Cores - Dr Eric Wolff\, Br
 itish Antarctic Survey\, Natural Environment Research Council\, High Cross
 \, Madingley Road\, Cambridge CB3 0ET\, UK. ewwo@bas.ac.uk
DTSTART:20100211T193000Z
DTEND:20100211T203000Z
UID:TALK21200@talks.cam.ac.uk
CONTACT:Isabella Stöcker
DESCRIPTION:Many of the important properties and uses of ice actually depe
 nd on impurities that are present: isotopic variants of water molecules\, 
 small amounts of soluble and insoluble material derived from the aerosol a
 nd gas phase\, and the trace constituents of the air bubbles that make up 
 around 10% of the volume of ice at atmospheric pressure. These impurities\
 , and their location within the ice structure\, affect local properties of
  the ice such as the electrical conductivity and mechanical strength\, whi
 ch scale up to give ice sheets their geophysical properties. In addition\,
  the concentrations of different impurities are used to give unique record
 s of palaeoclimate and palaeoenvironmental properties\, extending so far 8
 00\,000 years back in time. Ice core records from Greenland and Antarctica
  have for example shown us clearly that the increases in greenhouse gases 
 of the last 200 years are unprecedented in the context of the last 800\,00
 0 years\; ice cores have shown us that very rapid climate switches\, proba
 bly related to ocean heat transport\, can happen\; and they have revealed 
 details of the factors behind the major swings in Earth’s climate from g
 lacial to interglacial conditions that occur roughly every 100\,000 years.
  The talk will mix discussion of the analytical chemistry behind the measu
 rements and the environmental chemistry that influences the climate.
LOCATION:Wolfson Lecture Theatre\, Department of Chemistry\, Lensfield Rd\
 , CB2 1EW
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