Chen et al. (2025) Alternative Interpretation of MJO Teleconnection via Dynamical Mode Decomposition

⚠️ Warning: This summary was generated from the abstract only, as the full text was not available.

Identification

• Journal: Journal of Climate
• Year: 2025
• Date: 2025-08-04
• Authors: Guosen Chen, Yiran Jiang
• DOI: 10.1175/jcli-d-24-0684.1

Research Groups

Not specified in the provided text.

Short Summary

This study employs Dynamical Mode Decomposition (DMD) to analyze Madden–Julian oscillation (MJO) teleconnections, interpreting them as a spatiotemporal resonance between MJO forcing and the atmosphere's internal unforced dynamics.

Objective

• To investigate the dynamics of MJO teleconnections, specifically how they interact with extratropical climate variability and respond to varying MJO propagation speeds.

Study Configuration

• Spatial Scale: Global (Tropospheric upper-level atmosphere).
• Temporal Scale: Intraseasonal.

Methodology and Data

• Models used: Dynamical Mode Decomposition (DMD).
• Data sources: Tropospheric upper-level atmosphere data (specific dataset not mentioned in the provided text).

Main Results

• MJO teleconnections can be interpreted as spatiotemporal resonance between MJO forcing and DMD modes representing unforced internal motion.
• Certain DMD modes exhibit regional spatial features resembling established climate variabilities, such as the Pacific–North American (PNA) and North Atlantic Oscillation (NAO).
• The interaction between these DMD modes and MJO forcing explains the modulation of extratropical climate variabilities on intraseasonal time scales.
• The variation in teleconnection responses to fast versus slow MJOs is explained by the temporal resonance between the MJO propagation speed and the DMD modes.
• The DMD-based approach provides a viable alternative to the classical dynamical view based on the vorticity equation.

Contributions

• Provides a new dynamical framework for understanding MJO teleconnections using DMD, offering insights into the interaction between tropical forcing and extratropical internal variability.
• Offers a theoretical basis for improving the simulation and prediction of MJO-induced global teleconnections in climate models.

Funding

Not specified in the provided text.

Citation

@article{Chen2025Alternative,
  author = {Chen, Guosen and Jiang, Yiran},
  title = {Alternative Interpretation of MJO Teleconnection via Dynamical Mode Decomposition},
  journal = {Journal of Climate},
  year = {2025},
  doi = {10.1175/jcli-d-24-0684.1},
  url = {https://doi.org/10.1175/jcli-d-24-0684.1}
}