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Chemical signals of past climate and environment from polar ice cores and firn air

Wolff, Eric W.. 2012 Chemical signals of past climate and environment from polar ice cores and firn air. Chemical Society Reviews, 41 (19). 6247-6258. 10.1039/C2CS35227C

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Abstract/Summary

Chemical and isotopic records obtained from polar ice cores have provided some of the most iconic datasets in Earth system science. Here, I discuss how the different records are formed in the ice sheets, emphasising in particular the contrast between chemistry held in the snow/ice phase, and that which is trapped in air bubbles. Air diffusing slowly through the upper firn layers of the ice sheet can also be sampled in large volumes to give more recent historical information on atmospheric composition. The chemical and geophysical issues that have to be solved to interpret ice core data in terms of atmospheric composition and emission changes are also highlighted. Ice cores and firn air have provided particularly strong evidence about recent changes (last few decades to centuries), including otherwise inaccessible data on increases in compounds that are active as greenhouse gases or as agents of stratospheric depletion. On longer timescales (up to 800 000 years in Antarctica), ice cores reveal major changes in biogeochemical cycling, which acted as feedbacks on the very major changes in climate between glacial and interglacial periods.

Item Type: Publication - Article
Digital Object Identifier (DOI): 10.1039/C2CS35227C
Programmes: BAS Programmes > Polar Science for Planet Earth (2009 - ) > Chemistry and Past Climate
NORA Subject Terms: Chemistry
Date made live: 07 Aug 2012 08:42
URI: http://nora.nerc.ac.uk/id/eprint/18847

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