Document Type
Article
Digital Object Identifier (DOI)
10.1029/2023GL107111
Journal Title
Geophysical Research Letters
Publication Date
2024
Abstract
The timing and geographic extent of a potential “4.2 ky event” remain highly contested. Here we present records of ENSO variability at 3.8 kyBP and 4.1 kyBP derived from a Borneo stalagmite, which suggest a significant change in ENSO properties between these time intervals. The Borneo records show evidence of significantly reduced ENSO activity at 4.1 kyBP, relative to other measured windows within the Holocene. This reduced ENSO activity coincides with a period of drier conditions and enhanced dust events in the Middle East that took place ∼4.0–4.3 kyBP. The Borneo records show evidence of enhanced ENSO activity at 3.8 kyBP. Various hydroclimate changes attributed to the “4.2 ky event” in many regions may thus be reflecting a shift from reduced to enhanced El Niño activity that occurred between 3.8 kyBP to 4.0 kyBP.
Publisher Statement
© 2024. The Authors.
This is an open access article under the terms of the Creative Commons Attribution-NonCommercial-NoDerivs License, which permits use and distribution in any medium, provided the original work is properly cited, the use is non-commercial and no modifications or adaptations are made.
Recommended Citation
Theaker, C.M., Carolin, S.A., Day, C.C., Cobb, K.M., Chen, S., Grothe, P.R., and Couper, H.O., 2024, Borneo stalagmite evidence of significantly reduced El Niño‐Southern Oscillation variability at 4.1 kybp: Geophysical Research Letters, v. 51, p. e2023GL107111, doi:10.1029/2023GL107111.
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Comments
The definitive article is available on the website of Geophysical Research Letters - https://doi.org/10.1029/2023GL107111,