Du et al. (2025) Joint influences of ENSO and East Asian winter monsoon on the Hadley circulation in the Asian monsoon domain

Identification

• Journal: Global and Planetary Change
• Year: 2025
• Date: 2025-10-10
• Authors: Mengying Du, Yan Li, Juan Feng, Qi Wen, Wenjun Song, Zhilan Wang
• DOI: 10.1016/j.gloplacha.2025.105116

Research Groups

• College of Atmospheric Sciences, Lanzhou University, Lanzhou, Gansu 730000, China
• State Key Laboratory of Remote Sensing Science, Faculty of Geographical Science, Beijing Normal University, Beijing 100875, China
• Beijing Engineering Research Center for Global Land Remote Sensing Products, Faculty of Geographical Science, Beijing Normal University, Beijing 100875, China
• Key Laboratory of Water Security and Water Environment Protection in Plateau Intersection, Ministry of Education, College of Chemistry and Chemical Engineering, Northwest Normal University, Lanzhou 730070, China
• Lanzhou Institute of Arid Meteorology, China Meteorological Administration, Key Laboratory of Arid Climatic Change and Reducing Disaster of Gansu, Key Laboratory of Arid Climatic Change and Disaster Reduction of CMA, Lanzhou 730020, China

Short Summary

This study investigates the combined influences of the El Niño-Southern Oscillation (ENSO) and the East Asian Winter Monsoon (EAWM) on the Hadley Circulation in the Asian monsoon domain (AMHC), finding a synergistic weakening of the AMHC by 15.5 % during co-occurring El Niño and weak EAWM events.

Objective

• To investigate the joint influences of the El Niño-Southern Oscillation (ENSO) and the East Asian Winter Monsoon (EAWM) on the Hadley Circulation (HC) within the Asian monsoon domain (AMHC) and explore the underlying mechanisms.

Study Configuration

• Spatial Scale: Asian monsoon domain
• Temporal Scale: Interannual variability (implied by ENSO and EAWM)

Methodology and Data

• Models used: Not explicitly specified in the provided text.
• Data sources: Analysis of Sea Surface Temperature (SST) and atmospheric circulation data (specific sources not detailed in the provided text).

Main Results

• Both ENSO and EAWM significantly influence the regional HC, exhibiting an asymmetric effect.
• A synergistic weakening effect on the AMHC is observed during El Niño and weak EAWM events.
• The co-occurrence of El Niño and weak EAWM events significantly weakens the AMHC, reducing its intensity by 15.5 % compared to the climatological mean.
• This weakening is primarily attributed to the development of an anomalous meridional gradient of Sea Surface Temperature (SST) in the North Pacific, which alters atmospheric baroclinicity and static stability through air-sea interactions, leading to an anomalous meridional circulation.

Contributions

• Highlights the critical joint influences of ENSO and EAWM on the regional Hadley Circulation (AMHC), moving beyond studies focusing on individual factors or global HC.
• Offers a new perspective on the mechanism driving regional HC variations by elucidating the synergistic effects of these two major climate phenomena.

Funding

• Not specified in the provided text.

Citation

@article{Du2025Joint,
  author = {Du, Mengying and Li, Yan and Feng, Juan and Wen, Qi and Song, Wenjun and Wang, Zhilan},
  title = {Joint influences of ENSO and East Asian winter monsoon on the Hadley circulation in the Asian monsoon domain},
  journal = {Global and Planetary Change},
  year = {2025},
  doi = {10.1016/j.gloplacha.2025.105116},
  url = {https://doi.org/10.1016/j.gloplacha.2025.105116}
}