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Downscaling Extreme Precipitation with Wasserstein Regularized Diffusion

Created by
  • Haebom

Author

Yuhao Liu, James Doss-Gollin, Qiushi Dai, Ashok Veeraraghavan, Guha Balakrishnan

Outline

This paper presents Wasserstein Regularized Diffusion (WassDiff), a novel method for augmenting low-resolution rainfall data (gauge and reanalysis data) to high resolution. Unlike existing deep generative models, WassDiff utilizes a Wasserstein distribution-matched regularizer to reduce empirical bias in extreme intensity. Unlike high-resolution data from radar and mesonet networks, WassDiff transforms long-term, wide-area, low-resolution data into high-resolution data, providing high-resolution, long-term rainfall data necessary for analyzing extreme rainfall events. Experimental results show that WassDiff outperforms existing state-of-the-art methods in reproducing extreme weather events such as tropical storms and cold fronts.

Takeaways, Limitations

Takeaways:
Upgrading low-resolution rainfall data to high-resolution can contribute to improving the accuracy of extreme rainfall phenomenon analysis and flood risk assessment.
Overcoming the limitations of existing methods to improve accuracy in extreme intensity.
Provides a practical method for obtaining long-term, high-resolution rainfall information by leveraging globally available low-resolution data.
Providing useful information for developing climate change adaptation plans.
Limitations:
The performance of WassDiff may depend on the quality of the low-resolution data used as input.
Additional generalization performance evaluations for specific regions or climatic conditions are needed.
Analysis of the model's computational cost and processing time is required.
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