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

Jérôme Kaiser (), Enno Schefuß, James Collins, René Garreaud, Jan-Berend W. Stuut, Nicoletta Ruggieri, Ricardo Pol-Holz and Frank Lamy
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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)
René Garreaud: University of Chile
Jan-Berend W. Stuut: Bremen University
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)

Nature Communications, 2024, vol. 15, issue 1, 1-8

Abstract: 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.

Date: 2024
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DOI: 10.1038/s41467-024-51985-4

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