Chen et al. (2025) Impact of El Niño‐Southern Oscillation and Madden‐Julian Oscillation on the US Puget Sound Regional Hydroclimate

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

Identification

• Journal: Journal of Geophysical Research Atmospheres
• Year: 2025
• Date: 2025-10-07
• Authors: Xiaodong Chen, L. Ruby Leung, Ning Sun
• DOI: 10.1029/2024jd042936

Research Groups

Not explicitly mentioned in the abstract.

Short Summary

This study investigates the connections of El Niño–Southern Oscillation (ENSO) and Madden–Julian Oscillation (MJO) to hydroclimate conditions and extremes in the Puget Sound basin. It finds that ENSO significantly modulates cold season temperature and runoff, leading to snow drought, while MJO phases 6–7 trigger extreme precipitation, temperature, snowmelt, and runoff at short lags, offering potential for improved regional water resource prediction.

Objective

• To examine the connection of ENSO and MJO to the hydroclimate conditions and extremes in the Puget Sound (PS) basin located in the US Pacific Northwest coast.

Study Configuration

• Spatial Scale: Puget Sound (PS) basin, US Pacific Northwest coast.
• Temporal Scale: Seasonal (ENSO impacts) and daily (MJO impacts, 0–9 day lags). Analysis also considers the 2001–2020 period for changes in impacts.

Methodology and Data

• Models used: Not explicitly mentioned in the abstract.
• Data sources: Not explicitly mentioned in the abstract (implied hydroclimate and climate variability data).

Main Results

• ENSO significantly modulates cold season temperature and temperature-mediated hydrologic processes in the Puget Sound basin.
• El Niño cold seasons feature less snow accumulation and intensified surface runoff, even with similar precipitation amounts compared to La Niña cold seasons.
• El Niño causes more snow drought, specifically compound dry and warm snow drought, and shifts surface runoff seasonality by reducing runoff in the subsequent warm season.
• MJO phases 6–7 trigger more extreme precipitation, temperature, snowmelt, and runoff in the Puget Sound region at 0–9 day lags.
• The connection between MJO phases 6–7 and extreme events is robust, regardless of ENSO signal removal.
• MJO modulates large-scale extreme weather systems, such as atmospheric rivers, with significant enhancement during phases 6–7.
• ENSO impacts intensified during the 2001–2020 period.
• MJO impacts showed some phase shift during the 2001–2020 period.

Contributions

• Reveals ENSO and MJO phases 6–7 as useful predictors of Puget Sound hydroclimate anomalies and extremes at seasonal and daily scales, respectively.
• Provides findings that hold potential to improve regional water resources prediction and management.

Funding

Not explicitly mentioned in the abstract.

Citation

@article{Chen2025Impact,
  author = {Chen, Xiaodong and Leung, L. Ruby and Sun, Ning},
  title = {Impact of El Niño‐Southern Oscillation and Madden‐Julian Oscillation on the US Puget Sound Regional Hydroclimate},
  journal = {Journal of Geophysical Research Atmospheres},
  year = {2025},
  doi = {10.1029/2024jd042936},
  url = {https://doi.org/10.1029/2024jd042936}
}