Brief communication: organochlorine pesticides in an archived firn core from Law Dome, East Antarctica

• Published in: The Cryosphere
• Main Authors: Bigot, M, Curran, MAJ, Moy, AD, Muir, DCG, Hawker, DW, Cropp, R, Teixeira, CF, Bengtson Nash, SM
• Format: Article in Journal/Newspaper
• Language: English
• Published: Copernicus GmbH 2016
• Subjects: Earth Sciences; Atmospheric Sciences; Climate Change Processes; Arctic; East Antarctica; Law Dome; Antarc*; Antarctica; Climate change
• Online Access: https://doi.org/10.5194/tc-10-2533-2016; http://ecite.utas.edu.au/112484

Organochlorine pesticides (OCPs) were, for the first time, quantified in archived firn cores from East Antarctica representative of 19451957 and 19581967 (current era, C.E.). The core sections were melted under high-purity nitrogen atmosphere, and the meltwater was analysed. Methods allowed quantification of hexachlorocyclohexanes, heptachlor, trans-chlordane, dieldrin and endrin. While the core presented evidence of nominal contamination by modern-use chemicals, indicating handling and/or storage contamination, legacy OCP concentrations and deposition rates reported are orders of magnitude lower than those from Arctic regions, lending support for their validity. The study further provides a description of equipment used and suggests methods to overcome logistical challenges associated with trace organic contaminant detection in polar regions.