Re-evaluating paleocirculation changes from neodymium isotopes

can calcareous sediments provide a source of neodymium to the global ocean?

    Research output: Chapter in Book/Report/Conference proceedingConference abstract

    Abstract

    Australia's climate, economy, and habitability are strongly tied to the surrounding ocean and the warming, acidification, and deoxygenation associated with climate change present a triple threat. Any one of these changes may be amplified in both magnitude and rate by even small shifts in the strength or location of ocean currents. Accurate prediction of these changes requires our climate models to be informed by proxy records since the range of environmental variability captured by human observation, let along quantified by instrumentation, fails to capture the full spectrum of behavior exhibited by Earth's climate system. Marine neodymium isotope records are one such proxy, considered quasi-conservative and widely used for paleocirculation despite ambiguities in the modern oceanic budget. A sedimentary source has recently been proposed to resolve the budget, indicating non-conservative behavior. Shallow continental margins and non-calcareous sediments have been focused on as regions where the paleocirculation record may be compromised by sediment processes. However, new data from the Tasman Sea suggests that even regions dominated by calcareous sediments experience a significant benthic flux of neodymium. These findings suggest that the use of sedimentary neodymium isotope records as strictly a water mass tracer may not be viable.
    Original languageEnglish
    Title of host publicationAMSA 2019
    Subtitle of host publicationprogram handbook
    PublisherAustralian Marine Sciences Association
    Pages223
    Number of pages1
    Publication statusPublished - 2019
    EventAustralian Marine Science Association 2019 Conference: Marine Science for a Blue Economy - Esplanade Hotel Fremantle by Rydges, Freemantle, Australia
    Duration: 7 Jul 201911 Jul 2019
    http://amsa19.amsa.asn.au/symposia-topics/

    Conference

    ConferenceAustralian Marine Science Association 2019 Conference
    Abbreviated titleAMSA 2019
    CountryAustralia
    CityFreemantle
    Period7/07/1911/07/19
    Internet address

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