Seasonal meandering of the polar front upstream of the Kerguelen Plateau

E. Pauthenet*, F. Roquet, G. Madec, C. Guinet, M. Hindell, C. R. McMahon, R. Harcourt, D. Nerini

*Corresponding author for this work

    Research output: Contribution to journalArticlepeer-review

    24 Citations (Scopus)
    41 Downloads (Pure)

    Abstract

    The location of the Antarctic Polar Front (PF) is mapped in the Southern Indian Ocean by decomposing the shape of temperature and salinity profiles into vertical modes using a functional Principal Component Analysis. We define the PF as the northernmost minimum of temperature at the subsurface and represent it as a linear combination of the first three modes. This method is applied on an ocean reanalysis data set and on in situ observations, revealing a seasonal variability of the PF latitudinal position that is most pronounced between the Conrad Rise and the Kerguelen Plateau. This shift coincides with variations in the transport across the Northern Kerguelen Plateau. We suggest that seasonal changes of the upper stratification may drive the observed variability of the PF, with potentially large implications for the pathways and residence time of water masses over the plateau and the phytoplankton bloom extending southeast of the Kerguelen Islands.

    Original languageEnglish
    Pages (from-to)9774-9781
    Number of pages8
    JournalGeophysical Research Letters
    Volume45
    Issue number18
    DOIs
    Publication statusPublished - 28 Sep 2018

    Bibliographical note

    Copyright the Author(s) 2018. Version archived for private and non-commercial use with the permission of the author/s and according to publisher conditions. For further rights please contact the publisher.

    Keywords

    • Antarctic Polar Front
    • functional principal component analysis
    • Kerguelen Plateau
    • Southern Indian Ocean
    • Southern Ocean fronts

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