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Orbital modulation of subtropical versus subantarctic moisture sources in the southeast Pacific mid-latitudes

Author

Listed:
  • Jérôme Kaiser

    (Leibniz Institute for Baltic Sea Research Warnemünde)

  • Enno Schefuß

    (Bremen University)

  • James Collins

    (Alfred-Wegener-Institut Helmholtz-Zentrum für Polar- und Meeresforschung (AWI)
    Thermo Fisher Scientific (Bremen) GmbH)

  • René Garreaud

    (University of Chile
    University of Chile)

  • Jan-Berend W. Stuut

    (Bremen University
    NIOZ—Royal Netherlands Institute for Sea Research and Utrecht University
    VU—Vrije Universiteit Amsterdam)

  • Nicoletta Ruggieri

    (Alfred-Wegener-Institut Helmholtz-Zentrum für Polar- und Meeresforschung (AWI))

  • Ricardo Pol-Holz

    (University of Magallanes)

  • Frank Lamy

    (Alfred-Wegener-Institut Helmholtz-Zentrum für Polar- und Meeresforschung (AWI))

Abstract

Reconstructing rainfall variability and moisture sources is a critical aspect to understand past and future hydroclimate dynamics. Here, we use changes in the deuterium content of land-plant leaf waxes from two marine sediment cores located off Chile to reconstruct changes in rainfall amount and variation in moisture sources over the last ~50 ka. The records indicate increased moisture in central Chile during precession maxima, but an obliquity modulation is evident in southern Chile. While the southern westerly winds are the dominant factor of precipitation in southern Chile by bringing moisture and perturbations from the extratropics, the subtropics represent an additional moisture source during precession maxima due to a stronger subtropical jet increasing moisture transport from the tropics to the mid-latitudes. These findings imply that a combination of orbital modulation of moisture sources and rainfall amount explains the last glacial moisture maximum and early Holocene moisture minimum in south-central Chile.

Suggested Citation

  • Jérôme Kaiser & Enno Schefuß & James Collins & René Garreaud & Jan-Berend W. Stuut & Nicoletta Ruggieri & Ricardo Pol-Holz & Frank Lamy, 2024. "Orbital modulation of subtropical versus subantarctic moisture sources in the southeast Pacific mid-latitudes," Nature Communications, Nature, vol. 15(1), pages 1-8, December.
    • Handle: RePEc:nat:natcom:v:15:y:2024:i:1:d:10.1038_s41467-024-51985-4
    DOI: 10.1038/s41467-024-51985-4
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    References listed on IDEAS

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    1. Jessica E. Tierney & Jason E. Smerdon & Kevin J. Anchukaitis & Richard Seager, 2013. "Multidecadal variability in East African hydroclimate controlled by the Indian Ocean," Nature, Nature, vol. 493(7432), pages 389-392, January.
    2. Enno Schefuß & Holger Kuhlmann & Gesine Mollenhauer & Matthias Prange & Jürgen Pätzold, 2011. "Forcing of wet phases in southeast Africa over the past 17,000 years," Nature, Nature, vol. 480(7378), pages 509-512, December.
    3. Enno Schefuß & Stefan Schouten & Ralph R. Schneider, 2005. "Climatic controls on central African hydrology during the past 20,000 years," Nature, Nature, vol. 437(7061), pages 1003-1006, October.
    4. James A. Collins & Matthias Prange & Thibaut Caley & Luis Gimeno & Britta Beckmann & Stefan Mulitza & Charlotte Skonieczny & Didier Roche & Enno Schefuß, 2017. "Rapid termination of the African Humid Period triggered by northern high-latitude cooling," Nature Communications, Nature, vol. 8(1), pages 1-11, December.
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