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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 demonstrates that Mj olnir is not only an effective data-driven global lightning parameterization but also a promising AI-based framework for next-generation Earth System Models (AI-ESMs).

Takeaways, Limitations

Takeaways:
An Effective Method for Parameterizing Global Lightning Flash Density Using Deep Learning
Mj olnir predicts lightning activity with higher accuracy (global Pearson correlation coefficient 0.96) than existing methods.
Presenting the possibility of application to next-generation Earth system models (AI-ESMs).
Effectively modeling the nonlinear relationship between large-scale environmental conditions and lightning activity.
Limitations:
Limitations is not explicitly mentioned in the paper. Further validation and performance evaluation under various conditions are required.
Limitations of ERA5 and WWLLN data may impact the performance of Mj olnir.
Lack of physical interpretation. The black-box nature of deep learning models can make it difficult to physically interpret their predictions.
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