Changing effects of external forcing on   Atlantic–Pacific interactions

Karmouche, Soufiane; Galytska, Evgenia; Meehl, Gerald A.; Runge, Jakob; Weigel, Katja; Eyring, Veronika

doi:https://doi.org/10.5194/esd-15-689-2024

Articles | Volume 15, issue 3

https://doi.org/10.5194/esd-15-689-2024

© Author(s) 2024. This work is distributed under
the Creative Commons Attribution 4.0 License.

https://doi.org/10.5194/esd-15-689-2024

© Author(s) 2024. This work is distributed under
the Creative Commons Attribution 4.0 License.

Articles | Volume 15, issue 3

Research article

|

11 Jun 2024

Research article |

| 11 Jun 2024

Changing effects of external forcing on Atlantic–Pacific interactions

Soufiane Karmouche, Evgenia Galytska, Gerald A. Meehl, Jakob Runge, Katja Weigel, and Veronika Eyring

Supplement

https://doi.org/10.5194/esd-15-689-2024-supplement

Data sets

CESM2 Pacific Pacemaker Ensemble N. Rosenbloom et al. https://doi.org/10.26024/gtrs-tf57

Role of Tropical Variability in Driving Decadal Shifts in the Southern Hemisphere Summertime Eddy-Driven Jet (https://www.earthsystemgrid.org/dataset/ucar.cgd.ccsm4.ATL-PACEMAKER.html) D. Yang et al. https://doi.org/10.1175/jcli-d-19-0604.1

Model code and software

jakobrunge/tigramite: Tigramite 5.2 J. Runge et al. https://doi.org/10.5281/ZENODO.7747255

ESMValTool B. Andela et al. https://doi.org/10.5281/zenodo.10408909

EyringMLClimateGroup/karmouche24esd_AtlanticPacificPacemaker_Causality: 1st Release S. Karmouche https://doi.org/10.5281/zenodo.11518925

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Short summary

This study explores Atlantic–Pacific interactions and their response to external factors. Causal analysis of 1950–2014 data reveals a shift from a Pacific- to an Atlantic-driven regime. Contrasting impacts between El Niño and tropical Atlantic temperatures are highlighted, along with different pathways connecting the two oceans. The findings also suggest increasing remote contributions of forced Atlantic responses in modulating local Pacific responses during the most recent analyzed decades.