The influence of Antarctic subglacial volcanism on the globa

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TitleThe influence of Antarctic subglacial volcanism on the global iron cycle during the Last Glacial MaximumAbstractMarine sediment records suggest that episodes of major atmospheric CO2 drawdown during the last glacial period were linked to iron (Fe) fertilization of subantarctic surface waters. The principal source of this Fe is thought to be dust transported from southern mid-latitude deserts. However, uncertainty exists over contributions to CO2 sequestration from complementary Fe sources, such as the Antarctic ice sheet, due to the difficulty of locating and interrogating suitable archives that have the potential to preserve such information. Here we present petrographic, geochemical and microbial DNA evidence preserved in precisely dated subglacial calcites from close to the East Antarctic Ice-Sheet margin, which together suggest that volcanically-induced drainage of Fe-rich waters during the Last Glacial Maximum could have reached the Southern Ocean. Our results support a significant contribution of Antarctic volcanism to subglacial transport and delivery of nutrients with implications on ocean productivity at peak glacial conditions. © The Author(s) 2017.

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1st AuthorFrisia, S. AuthorFrisia, S.Weyrich, L.Hellstrom, J.Borsato, A.Golledge, N.Anesio, A.Bajo, P.Drysdale, R.Augustinus, P.Rivard, C.Cooper, A.Year2017JournalNature CommunicationsVolume8DOI10.1038/ncomms15425URLhttps://www.scopus.com/inward/recor.....11eba7c802cdce9b805f27eaaPublisherNature Publishing GroupKeywordsancient DNAcalcium carbonatecarbon dioxideironorganic mattersurface water, atmospheric gasatmospheric transportcalcitecarbon dioxidecarbon sequestrationdesertDNAdustgeochemistryice marginironLast Glacial Maximummarine sedimentnutrient dynamicspetrographysediment analysissubglacial depositsubglacial environmentvolcanism, AntarcticaArticlecontrolled studyenvironmental aspects and related phenomenageochemistryhydrologyice sheetlast glacial maximummicrobial communityseasedimentsedimentologysubglacial volcanism, Antarctic Ice SheetAntarctica

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CitationFrisia, S., Weyrich, L., Hellstrom, J., Borsato, A., Golledge, N., Anesio, A., Bajo, P., Drysdale, R., Augustinus, P., Rivard, C. and Cooper, A. (2017). The influence of Antarctic subglacial volcanism on the global iron cycle during the Last Glacial Maximum. Nature Communications, 8Antarctica NZ supported?YesNZARI?No

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