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Influence of the Tungurahua eruption on the ice core records of Chimborazo, Ecuador

P. Ginot 1 U. Schotterer 2 W. Stichler 3 A. Godoi M. 4 B. Francou 5 M. Schwikowski 4
1 CHANG - CHANG
LTHE - Laboratoire d'étude des transferts en hydrologie et environnement
2 CEP - Climate and Environmental Physics [Bern]
Physikalisches Institut [Bern]
5 CHYC
LTHE - Laboratoire d'étude des transferts en hydrologie et environnement
Abstract : The comparison of two shallow ice cores recovered in 1999 and 2000 from the same place on the Chimborazo summit glacier revealed the influence of the coincident Tungurahua volcanic eruption on their stable isotope and chemical records. The surface snow melting and water percolation induced from the ash deposition caused a preferential elution and re-localization of certain ionic species, while the stable isotope records were not affected. Additionally, the comparison of the ionic amount and some selected ion ratios preserved along the ice core column reports under which processes the chemical species are introduced in the snow pack, as snow flake condensation nuclei, by atmospheric scavenging or by dry deposition. This preliminary study is essential for the interpretation of the deep Chimborazo ice core, or for other sites where surrounding volcanic activity influences the glaciochemical records.
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P. Ginot, U. Schotterer, W. Stichler, A. Godoi M., B. Francou, et al.. Influence of the Tungurahua eruption on the ice core records of Chimborazo, Ecuador. The Cryosphere, Copernicus 2010, 4 (4), pp.561-568. ⟨10.5194/tc-4-561-2010⟩. ⟨insu-00653290⟩

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