| Summary: | Investigation of organic compounds in ice cores can potentially unlock a wealth of new information in these climate archives. We present results from the first ever ice core drilled on subâ€Antarctic island Bouvet, representing a climatologically important but understudied region. We analyze a suite of novel and more familiar organic compounds in the ice core, alongside commonly measured ions. Methanesulfonic acid shows a significant, positive correlation to winter sea ice concentration, as does a fatty acid compound, oleic acid. Both may be sourced from spring phytoplankton blooms, which are larger following greater sea ice extent in the preceding winter. Oxalate, formate, and acetate are positively correlated to sea ice concentration in summer, but sources of these require further investigation. This study demonstrates the potential application of organic compounds from the marine biosphere in generating multiproxy sea ice records, which is critical in improving our understanding of past sea ice changes. © 2019 The Authors. This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited. Received 23 JUN 2019; Accepted 14 AUG 2019; Accepted article online 19 AUG 2019; Published online 27 AUG 2019. Work by Amy King was jointly supported by Selwyn College, Cambridge, and the NERC Doctoral Training Programme (Grant NE/L002507/1). ACE and Elizabeth Thomas received funding from École Polytechnique Fédérale de Lausanne, the Swiss Polar Institute, and Ferring Pharmaceuticals Inc. Joel Pedro acknowledges support from the European Research Council under the European Community's Seventh Framework Programme (FP7/2007e2013)/ERC Grant Agreement 610055 as part of the ice2ice project. The authors would like to acknowledge Emily Ludlow and Shaun Miller for analyses and processing of major ion and isotope data from the Bouvet ice core samples, Scott Hosking for calculation of regional ...
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