Xue et al. (2025) Characteristics and Mechanisms of Non‐Stationary Turbulence in a Megacity Area

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Identification

• Journal: Geophysical Research Letters
• Year: 2025
• Date: 2025-07-26
• Authors: Jiesheng Xue, Lu Zhang, Linlin Wang, Alexander Baklanov, Yuanjian Yang
• DOI: 10.1029/2025gl114978

Research Groups

Not specified in the provided text.

Short Summary

This study analyzes turbulent non-stationarity in Beijing, finding that it occurs in 52.41% of observations and is primarily driven by submeso motions that reduce turbulent transport efficiency.

Objective

• To investigate the characteristics and potential physical mechanisms of turbulent non-stationarity within a megacity urban environment.

Study Configuration

• Spatial Scale: Megacity area (Beijing, China).
• Temporal Scale: Annual data from 2017.

Methodology and Data

• Models used: Hilbert-Huang transform (HHT) for the removal of submeso motions.
• Data sources: Observational data from Beijing.

Main Results

• Prevalence: Non-stationary turbulence accounted for 52.41% of the observed data in 2017.
• Conditions: Strong non-stationarity is most frequent under strongly-stable or strongly-unstable stratification conditions.
• Physical Impact: Non-stationarity reduces turbulent transport efficiency, characterized by the disintegration of turbulent coherent structures and the dominance of submeso motions.
• Causality: Submeso motions, specifically internal gravity waves and convective circulations, are identified as the primary causes of non-stationarity.
• Mitigation: The application of the Hilbert-Huang transform to remove submeso motions effectively reduces the level of non-stationarity.

Contributions

• Identifies the critical role of submeso motions in driving urban turbulent non-stationarity.
• Demonstrates a method to reduce non-stationarity for more accurate turbulent flux estimation and improved parameterization of exchange processes in heterogeneous urban areas.

Funding

Not specified in the provided text.

Citation

@article{Xue2025Characteristics,
  author = {Xue, Jiesheng and Zhang, Lu and Wang, Linlin and Baklanov, Alexander and Yang, Yuanjian},
  title = {Characteristics and Mechanisms of Non‐Stationary Turbulence in a Megacity Area},
  journal = {Geophysical Research Letters},
  year = {2025},
  doi = {10.1029/2025gl114978},
  url = {https://doi.org/10.1029/2025gl114978}
}