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Concentration and isotopic composition of bromine and chlorine in Antarctic sea ice

Vallelonga, P, de Gois, JS, Borges, DLG, Costas-Rodriguez, M, Gkinis, V, Lannuzel, D ORCID: 0000-0001-6154-1837, Spolaor, A and Vanhaecke, F 2021 , 'Concentration and isotopic composition of bromine and chlorine in Antarctic sea ice' , Geochimica Et Cosmochimica Acta, vol. 293 , pp. 18-27 , doi: 10.1016/j.gca.2020.10.020.

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Abstract

This work presents the first investigation of Br and Cl isotopic partitioning in Southern Ocean sea ice. The sea ice samples characterized were collected during the Australian-led Sea Ice Physics and Ecosystem eXperiment-2 (SIPEX-2) marine voyage in austral spring of 2012 (26 Sept – 10 Nov), within the area bounded by 115–125°E and 62–66oS off the East Antarctic coast. Bromine concentrations ranged from 710 ± 20 μg L-1 to 31440 ± 570 μg L-1 and chlorine concentrations ranged from 218 ± 12 mg L-1 to 7945 ± 351 mg L-1. Bromine and chlorine concentrations were positively correlated with a slope of 0.0038 (r=0.996, p81Br with respect to SMOB isotopic reference) varied from -0.64 to 0.10‰ with a mean of -0.16‰ and standard deviation of 0.04‰. Chlorine isotopic compositions (denoted δ37Cl with respect to SMOC isotopic reference) varied from -1.10‰ to 0.43‰ with a mean of -0.26‰ and standard deviation of 0.10‰. Despite their strong concentration correlation, there was a much less consistent relation between Br and Cl isotopic compositions (r=0.74, p

Item Type: Article
Authors/Creators:Vallelonga, P and de Gois, JS and Borges, DLG and Costas-Rodriguez, M and Gkinis, V and Lannuzel, D and Spolaor, A and Vanhaecke, F
Keywords: Antarctic, sea ice, halogens, isotopes; Antarctic, trace elements, SIPEX-2, chlorophyll-a, brine, multi-collector ICP-MS
Journal or Publication Title: Geochimica Et Cosmochimica Acta
Publisher: Pergamon-Elsevier Science Ltd
ISSN: 0016-7037
DOI / ID Number: 10.1016/j.gca.2020.10.020
Copyright Information:

Copyright 2020 Elsevier Ltd.

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