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 De Pol-Holz; Frank Lamy

doi:10.1038/s41467-024-51985-4

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 De Pol-Holz, Frank Lamy

^*Corresponding author for this work

Earth and Climate

Research output: Contribution to Journal › Article › Academic › peer-review

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.

Original language	English
Article number	7512
Pages (from-to)	1-8
Number of pages	8
Journal	Nature Communications
Volume	15
Early online date	29 Aug 2024
DOIs	https://doi.org/10.1038/s41467-024-51985-4
Publication status	Published - 2024

Bibliographical note

Publisher Copyright:
© The Author(s) 2024.

Funding

J.K. was supported by the Leibniz Association. J.A.C. was supported by the Helmholtz Postdoc Programme (PD-001) and the Alfred Wegener Institute Helmholtz Centre for Polar and Marine Research, Bremerhaven, as for F.L. and N.R. E.S. was supported by the Cluster of Excellence \u2018The Ocean Floor\u2014Earths Uncharted Interface\u2019. R.D.P.-H. was partially supported by ANID/Fondecyt 1201810.

Funders	Funder number
Alfred Wegener Institute Helmholtz Centre for Polar and Marine Research
Agencia Nacional de Investigación y Desarrollo
Cluster of Excellence ‘The Ocean Floor—Earths Uncharted Interface’
Leibniz-Gemeinschaft
Helmholtz Postdoc Programme	PD-001
Fondo Nacional de Desarrollo Científico y Tecnológico	1201810

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title = "Orbital modulation of subtropical versus subantarctic moisture sources in the southeast Pacific mid-latitudes",

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.",

author = "J{\'e}r{\^o}me Kaiser and Enno Schefu{\ss} and James Collins and Ren{\'e} Garreaud and Stuut, {Jan Berend W.} and Nicoletta Ruggieri and {De Pol-Holz}, Ricardo and Frank Lamy",

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doi = "10.1038/s41467-024-51985-4",

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AU - Kaiser, Jérôme

AU - Schefuß, Enno

AU - Collins, James

AU - Garreaud, René

AU - Stuut, Jan Berend W.

AU - Ruggieri, Nicoletta

AU - De Pol-Holz, Ricardo

AU - Lamy, Frank

PY - 2024

Y1 - 2024

N2 - 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.

AB - 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.

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ER -

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

Abstract

Bibliographical note

Funding

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