Lunar cycles and seasonal variations in deposition fluxes of planktic foraminiferal shell carbonate to the deep South Atlantic (central Walvis Ridge)

N. Loncaric, G.J.A. Brummer, D. Kroon

    Research output: Contribution to JournalArticleAcademicpeer-review

    Abstract

    Several authors have argued that lunar reproductive cycling controls the shell fluxes of planktic foraminifera, one of the major carbonate-producing groups in the global pelagic ocean. A time-series sediment trap at 2700 m depth on the central Walvis Ridge below the South Atlantic central gyre demonstrate for the first time that shell deposition fluxes of Hastigerina pelagica are synchronous with lunar periodicity. Spectral analysis of the 6-month time-series with 8-day resolution showed a strong 30-day cyclicity in the flux maxima of H. pelagica arriving at the ocean floor on average 12.5 days after each full moon. Given a shell settling velocity of about 400 m day
    Original languageEnglish
    Pages (from-to)1178-1188
    JournalDeep-Sea Research Part 1. Oceanographic Research Papers
    Volume52
    Issue number7
    DOIs
    Publication statusPublished - 2005

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