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Mj\"olnir: A Deep Learning Parametrization Framework for Global Lightning Flash Density

Created by
  • Haebom

Author

Minjong Cheon

Outline

Mj olnir is a novel deep learning-based global lightning flash density parameterization framework. Trained using ERA5 atmospheric predictors and WWLLN observations, it captures the nonlinear mapping between large-scale environmental conditions and lightning activity. Based on the InceptionNeXt backbone and SENet, it employs a multi-task learning strategy to simultaneously predict lightning occurrence and intensity. It accurately reproduces the distribution, seasonal variability, and regional characteristics of global lightning activity, achieving a global Pearson correlation coefficient of 0.96 for the annual mean field. This suggests that Mj olnir is not only an effective data-driven global lightning parameterization but also a promising AI-based approach for next-generation Earth System Models (AI-ESMs).

Takeaways, Limitations

Takeaways:
Improving the accuracy of global lightning activity forecasts using deep learning (achieving a Pearson correlation coefficient of 0.96).
Presenting a novel AI-based parameterization method that can contribute to the development of next-generation Earth system models (AI-ESMs).
Effectively modeling the nonlinear relationship between large-scale environmental conditions and lightning activity.
Limitations:
The paper does not specifically mention Limitations. Further validation and application to real-world Earth system models are required.
Lack of discussion on the impact that limitations of the ERA5 and WWLLN data (e.g., spatial and temporal resolution of the data, data quality) may have on model performance.
Lack of comparative analysis with other lightning prediction models.
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