A 300-year tree-ring δ18O-based precipitation reconstruction for the South American Altiplano highlights decadal hydroclimate teleconnections - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Communications Earth & Environment Année : 2024

A 300-year tree-ring δ18O-based precipitation reconstruction for the South American Altiplano highlights decadal hydroclimate teleconnections

Mukund Palat Rao
Troy Nixon
  • Fonction : Auteur
Mathias Vuille
Juan Antonio Rivera
Rose Oelkers
  • Fonction : Auteur
Duncan A Christie
Arianna M Varuolo-Clarke
M. Eugenia Ferrero
  • Fonction : Auteur
Troy Magney
  • Fonction : Auteur
Ricardo Villalba
  • Fonction : Auteur
Laia Andreu-Hayles

Résumé

Abstract Tropical South American climate is influenced by the South American Summer Monsoon and the El Niño Southern Oscillation. However, assessing natural hydroclimate variability in the region is hindered by the scarcity of long-term instrumental records. Here we present a tree-ring δ 18 O-based precipitation reconstruction for the South American Altiplano for 1700–2013 C.E., derived from Polylepis tarapacana tree rings. This record explains 56% of December–March instrumental precipitation variability in the Altiplano. The tree-ring δ 18 O chronology shows interannual (2–5 years) and decadal (~11 years) oscillations that are remarkably consistent with periodicities observed in Altiplano precipitation, central tropical Pacific sea surface temperatures, southern-tropical Andean ice core δ 18 O and tropical Pacific coral δ 18 O archives. These results demonstrate the value of annual-resolution tree-ring δ 18 O records to capture hydroclimate teleconnections and generate robust tropical climate reconstructions. This work contributes to a better understanding of global oxygen-isotope patterns, as well as atmospheric and oceanic processes across the tropics.
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Dates et versions

hal-04621463 , version 1 (24-06-2024)

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Milagros Rodriguez-Caton, Mariano S Morales, Mukund Palat Rao, Troy Nixon, Mathias Vuille, et al.. A 300-year tree-ring δ18O-based precipitation reconstruction for the South American Altiplano highlights decadal hydroclimate teleconnections. Communications Earth & Environment, 2024, 5 (1), pp.269. ⟨10.1038/s43247-024-01385-9⟩. ⟨hal-04621463⟩
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