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Forced changes in the Pacific Walker circulation over the past millennium

Earth Sciences

Forced changes in the Pacific Walker circulation over the past millennium

G. Falster, B. Konecky, et al.

Discover how a groundbreaking reconstruction of the Pacific Walker Circulation reveals unexpected historical patterns in climate response during 1200–2000. This novel research conducted by Georgina Falster, Bronwen Konecky, Sloan Coats, and Samantha Stevenson uncovers the intriguing influence of volcanic eruptions and potential anthropogenic effects.

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Playback language: English
Abstract
This study uses a new annually resolved, multi-method, palaeoproxy-derived Pacific Walker Circulation (PWC) reconstruction ensemble (1200–2000) to investigate the PWC's response to external forcings. The reconstruction shows that the 1992–2011 PWC strengthening, while anomalous, is not unprecedented in the past 800 years. It finds no significant industrial-era PWC trend, contrasting with most climate model simulations. However, a shift to lower-frequency variability in the industrial era suggests a subtle anthropogenic influence. Volcanic eruptions are shown to trigger El Niño-like PWC weakening, consistent with climate model simulations.
Publisher
Nature
Published On
Aug 23, 2023
Authors
Georgina Falster, Bronwen Konecky, Sloan Coats, Samantha Stevenson
Tags
Pacific Walker Circulation
climate reconstruction
anthropogenic influence
volcanic eruptions
El Niño
climate variability
external forcings

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