Impurity influence on normal grain growth in the GISP2 ice core, Greenland

R. B. Alley, G. A. Woods

Research output: Contribution to journalArticlepeer-review

56 Scopus citations


Intercept analysis of approximately bi-yearly vertical thin sections from the upper part of the GISP2 ice core, central Greenland, shows that grain-size ranges increase with increasing age. This demonstrates that something in the ice affects grain-growth rates, and that grain-size cannot be used directly in paleothermometry as has been proposed. Correlation of grain-growth rates to chemical and isotopic data indicates slower growth in ice with higher impurity concentrations, and especially slow growth in "forest-fire" layers containing abundant ammonium; however, the impurity/grain-growth relations are quite noisy. Little correlation is found between growth rate and isotopic composition of ice.

Original languageEnglish (US)
Pages (from-to)255-260
Number of pages6
JournalJournal of Glaciology
Issue number141
StatePublished - 1996

All Science Journal Classification (ASJC) codes

  • Earth-Surface Processes


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