Zhu et al. (2025) The Frequency and Intensity of Extreme Dust Events and Related Driving Factors in Major Dust Sources Based on MERRA-2 Aerosol Reanalysis

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Identification

• Journal: Journal of Climate
• Year: 2025
• Date: 2025-07-03
• Authors: Qingzhe Zhu, Yuzhi Liu
• DOI: 10.1175/jcli-d-24-0702.1

Research Groups

Not specified in the provided text.

Short Summary

This study analyzes the frequency, intensity, and drivers of spring extreme dust events (EDEs) from 2000 to 2023, finding that EDEs in North Africa and the Middle East are driven by the East Atlantic/West Russia teleconnection rather than the North Atlantic Oscillation.

Objective

• To evaluate the long-term frequency and intensity of spring EDEs.
• To assess the regional applicability and performance of the MERRA-2 aerosol reanalysis product in capturing EDEs.
• To identify the atmospheric driving factors and mechanisms governing EDEs in North Africa (NA) and the Middle East (ME).

Study Configuration

• Spatial Scale: Regional (North Africa, Middle East, and the Taklamakan Desert).
• Temporal Scale: 2000–2023 (Spring season).

Methodology and Data

• Models used: MERRA-2 aerosol reanalysis.
• Data sources: MODIS satellite observations and MERRA-2 reanalysis data.

Main Results

• MERRA-2 Performance: The reanalysis product shows favorable performance in the Middle East and North Africa but underperforms in the Taklamakan Desert.
• Frequency and Intensity: EDE frequency in the ME and NA exhibited an initial increase followed by a decrease; EDE intensity was found to be higher in North Africa.
• Driving Factors: Spring EDEs in NA and ME are driven by the East Atlantic/West Russia teleconnection—which creates anomalous high pressure over the Mediterranean Sea and anomalous low pressure over the Eurasian continent—rather than the North Atlantic Oscillation.
• Mechanism: The propagation of Rossby waves leads to successive EDE occurrences in North Africa and then the Middle East.
• Nature of EDEs: Dust Optical Depth (DOD) during EDEs acts as an independent mode rather than simply being an extreme manifestation of spring-averaged DOD.

Contributions

• Provides a critical evaluation of the regional reliability of MERRA-2 for dust studies.
• Demonstrates that EDEs are an independent atmospheric mode, shifting the understanding away from them being mere extremes of average seasonal dust.
• Identifies the East Atlantic/West Russia teleconnection as a key predictor for EDEs in North Africa and the Middle East.

Funding

Not specified in the provided text.

Citation

@article{Zhu2025Frequency,
  author = {Zhu, Qingzhe and Liu, Yuzhi and Xiao, Na},
  title = {The Frequency and Intensity of Extreme Dust Events and Related Driving Factors in Major Dust Sources Based on MERRA-2 Aerosol Reanalysis},
  journal = {Journal of Climate},
  year = {2025},
  doi = {10.1175/jcli-d-24-0702.1},
  url = {https://doi.org/10.1175/jcli-d-24-0702.1}
}