Ionic content in an ice core from the West Antarctic Ice Sheet: 1882–2008 A.D.

ISAÍAS ULLMANN THOEN, JEFFERSON CARDIA SIMÕES, FILIPE GAUDIE LEY LINDAU, SHARON BUCHANAN SNEED

Resumo


The study of atmospheric aerosols through polar ice cores is one of the most common and robust tools for the investigation of past changes in the circulation and chemistry of the atmosphere. Only a few subannual resolution records are available for the development of paleochemical and environmental interpretations. Here, we report the ionic content record for the period of 1882–2008 A.D. in an ice core recovered at the ice divide of the West Antarctic Ice Sheet. The ion concentrations found in the core were determined by ion chromatography on more than 2,000 samples and the basic statistics were calculated for major inorganic and organic ions. The dating of the core layers was based on the seasonality of SO4 2‑, NO3 -, and Na+, checked by the identification of the Krakatau (1883), Agung (1963) and Pinatubo/Hudson (1991) volcanic eruption signals. Significant aerosol input events were identified and grouped considering the ions present, their provenance and the season. The ionic balance, together with the decomposition of some origin indicators, showed that 36% of the ionic charge is derived from sea salt aerosols, 13% from mineral dust, and 17% from biogenic marine activity, while 34% are mainly products of chemical reactivity in the atmosphere.


Palavras-chave


Aerosols; Ice core; West Antarctic Ice Sheet; Trace analysis; Ion chromatography.

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DOI: http://dx.doi.org/10.1590/2317-4889201820180037

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