Two Millennia of South Atlantic Convergence Zone Variability Reconstructed From Isotopic Proxies - INSU - Institut national des sciences de l'Univers Access content directly
Journal Articles Geophysical Research Letters Year : 2018

Two Millennia of South Atlantic Convergence Zone Variability Reconstructed From Isotopic Proxies

V. F. Novello
  • Function : Author
F. W. Cruz
  • Function : Author
M. Vuille
  • Function : Author
M. S. de Paula
  • Function : Author
D. Nunes
  • Function : Author
R. L. Edwards
  • Function : Author
H. Cheng
  • Function : Author
I. Karmann
  • Function : Author
N. M. Stríkis
  • Function : Author
J. L. P. S. Campos
  • Function : Author

Abstract

Most reconstructions of the South American Monsoon System (SAMS) over the last two millennia are based on δ18O records from locations at high-elevation sites in the Andes, which are not influenced by the South Atlantic Convergence Zone (SACZ). Yet the SACZ is a key driver of SAMS variability over much of Brazil. Here we use two new δ18O records from speleothems sampled in the central and southwestern portions of the SACZ core to show that the SAMS was not varying in phase over the entire tropical continent during the last two millennia. In fact, speleothem records located to the northeast of the SACZ record precipitation variations that are antiphased with similar records on the opposite side of the SACZ, in particular during the Little Ice Age period, while records close to the core of the SACZ axis show no significant departure from the mean state during this period.
Fichier principal
Vignette du fichier
Geophysical Research Letters - 2018 - Novello - Two Millennia of South Atlantic Convergence Zone Variability Reconstructed.pdf (1.35 Mo) Télécharger le fichier
Origin Publisher files allowed on an open archive

Dates and versions

insu-03589355 , version 1 (25-02-2022)

Licence

Copyright

Identifiers

Cite

V. F. Novello, F. W. Cruz, J. S. Moquet, M. Vuille, M. S. de Paula, et al.. Two Millennia of South Atlantic Convergence Zone Variability Reconstructed From Isotopic Proxies. Geophysical Research Letters, 2018, 45, pp.5045-5051. ⟨10.1029/2017GL076838⟩. ⟨insu-03589355⟩
10 View
29 Download

Altmetric

Share

Gmail Mastodon Facebook X LinkedIn More