Holocene productivity changes off Adélie Land (East Antarctica) on decadal to millennial timescales

D. Denis, X. Crosta, S. Schmidt, D. Carson, R. Ganeshram, H. Renssen, J. Crespin, O. Ther, I. Billy, J. Giraudeau

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    Abstract

    This study presents the first high-resolution multiproxy investigation of primary productivity (PP) during the Holocene from the Antarctic continental margins. Micropaleontological and geochemical data from the sediment core MD03-2601,associated to sea ice model outputs, give unprecedented insights into the biological pump of the Antarctic coastal areaoff Adélie Land in response to climatic changes. Plurimillennial and millennial changes of PP are observed in the study area in response to changes in nutrient availability, stratification, and growing season duration, which are linked to sea ice, upwelling, wind, and glacier dynamics. The precessional cycle seems to be responsible in the PP long-term variations, while forcing factors involved at the millennial timescale remain more enigmatic. Our results emphasize enhanced biological pump during warmer and windier Holocene phases because of a longer growing season and greater nutrient input. Antarctic coastal and continental shelf zones may therefore represent a more intense carbon sink in the future.
    Original languageEnglish
    Pages (from-to)PA3207
    Number of pages12
    JournalPaleoceanography
    Volume24
    DOIs
    Publication statusPublished - 2009

    Bibliographical note

    doi:10.1029/2008PA001689

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