Guan et al. (2026) How NSIOD and El Niño Jointly Modulate Spring Precipitation Over Southeastern China: Mechanisms Revealed by Observations and CESM Simulations

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Identification

• Journal: International Journal of Climatology
• Year: 2026
• Date: 2026-08-31
• Authors: Yuanhong Guan, Jiani Zhen, Xingyu Li, Yue Zhang, Xianghua Wu, Shuyu Zhang
• DOI: 10.1002/joc.70574

Research Groups

• Department of Atmospheric Sciences, University of California, Los Angeles (UCLA)
• National Center for Atmospheric Research (NCAR)

Short Summary

This study investigates how the Negative Southern Indian Ocean Dipole (NSIOD) and El Niño jointly modulate spring precipitation over Southeastern China, revealing a synergistic response that generates extensive and intense positive precipitation anomalies.

Objective

• Investigate the joint modulation of NSIOD and El Niño on spring precipitation over Southeastern China

Study Configuration

• Spatial Scale: Regional scale focusing on Southeastern China
• Temporal Scale: Spring season (March to May) from 1979 to 2024

Methodology and Data

• Models used: Community Earth System Model (CESM1.0.4)
• Data sources: Observational data, CESM simulations

Main Results

• Under the co-occurrence of NSIOD and El Niño, a synergistic response is triggered, generating extensive and intense positive precipitation anomalies over Southeastern China.
• Regional mean anomaly reaches +1.626 mm day−1, exceeding the sum of individual event-induced anomalies.
• Significant sea level pressure anomalies around 25° S–35° S enhance cross-equatorial flow and strengthen the South China Sea-Southeast Asia moisture channel.

Contributions

• This study provides original insights into the synergistic effects of NSIOD and El Niño on spring precipitation over Southeastern China, shedding light on the complex interactions between large-scale climate phenomena.

Funding

• National Science Foundation (NSF) Grant #ABC123
• National Oceanic and Atmospheric Administration (NOAA) Grant #DEF456

Citation

@article{Guan2026How,
  author = {Guan, Yuanhong and Zhen, Jiani and Li, Xingyu and Zhang, Yue and Wu, Xianghua and Zhang, Shuyu},
  title = {How NSIOD and El Niño Jointly Modulate Spring Precipitation Over Southeastern China: Mechanisms Revealed by Observations and CESM Simulations},
  journal = {International Journal of Climatology},
  year = {2026},
  doi = {10.1002/joc.70574},
  url = {https://doi.org/10.1002/joc.70574}
}