Li et al. (2025) Different Effects of Two ENSO Types on the Northern Mid‐to‐High Latitude Surface Air Temperature Distribution in Late Winter

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

Identification

• Journal: International Journal of Climatology
• Year: 2025
• Date: 2025-10-12
• Authors: Xin Geng, Yulei Zhu, Wenjun Zhang, Qingxia Xie, Tao Wei
• DOI: 10.1002/joc.70137

Research Groups

Not explicitly mentioned in the abstract, but typically involves climate science or atmospheric research groups.

Short Summary

This study investigates the distinct late winter Northern Hemisphere surface air temperature responses to Eastern Pacific (EP) and Central Pacific (CP) ENSO types. It finds that EP El Niño induces a "north cold, south warm" Eurasian temperature dipole, contrasting with a "north warm, south cold" pattern during CP El Niño, driven by differences in tropical Pacific convection and subsequent atmospheric wave trains.

Objective

• To examine the distinct late winter (February–March) Northern Hemisphere (NH) mid-to-high latitude surface air temperature (SAT) responses to Eastern Pacific (EP) and Central Pacific (CP) ENSO types.

Study Configuration

• Spatial Scale: Northern Hemisphere mid-to-high latitudes, Eurasia, tropical Pacific.
• Temporal Scale: Late winter (February–March).

Methodology and Data

• Models used: CMIP6 AMIP simulations.
• Data sources: Reanalysis data, observational analysis.

Main Results

• EP El Niño induces a "north cold, south warm" surface air temperature (SAT) dipole pattern over Eurasia.
• CP El Niño induces a "north warm, south cold" SAT pattern over Eurasia, contrasting sharply with EP El Niño.
• EP La Niña produces SAT anomalies nearly opposite to EP El Niño.
• CP La Niña responses are comparatively weak.
• The EP El Niño SAT dipole is driven by enhanced low pressure and cyclonic circulation over Eurasia, leading to meridional temperature advection.
• CP El Niño and both La Niña types are dominated by anomalous high pressure and anticyclonic circulation.
• The divergent Eurasian SAT patterns originate from differences in tropical Pacific convection anomalies.
• These convection anomalies excite distinct poleward-propagating Rossby wave trains and modulate the variability of the polar front jet (PFJ), influencing extratropical circulation.
• CMIP6 AMIP models realistically simulate these contrasting late winter NH SAT responses.

Contributions

• Provides a detailed distinction of the late winter Northern Hemisphere surface air temperature responses to different ENSO types (EP vs. CP El Niño/La Niña).
• Elucidates the specific atmospheric circulation mechanisms (pressure systems, cyclonic/anticyclonic circulation, meridional temperature advection, Rossby wave trains, polar front jet modulation) linking tropical Pacific convection anomalies to extratropical temperature patterns.
• Validates the capability of CMIP6 AMIP models to realistically simulate these complex and contrasting extratropical responses to ENSO.

Funding

Not explicitly mentioned in the abstract.

Citation

@article{Li2025Different,
  author = {Li, Zhiyu and Geng, Xin and Zhu, Yulei and Zhang, Wenjun and Xie, Qingxia and Wei, Tao},
  title = {Different Effects of Two <scp>ENSO</scp> Types on the Northern Mid‐to‐High Latitude Surface Air Temperature Distribution in Late Winter},
  journal = {International Journal of Climatology},
  year = {2025},
  doi = {10.1002/joc.70137},
  url = {https://doi.org/10.1002/joc.70137}
}