Towards Representation Learning for Atmospheric Dynamics

TL;DR

This paper introduces AtmoDist, a self-supervised neural network approach that learns meaningful representations of atmospheric dynamics by predicting temporal distances, enabling improved climate data analysis and super-resolution tasks.

Contribution

The paper presents a novel self-supervised learning method, AtmoDist, specifically designed for atmospheric data, which learns intrinsic features useful for climate modeling and super-resolution.

Findings

AtmoDist effectively learns representations of atmospheric dynamics.

Upscaled data closely matches high-resolution references.

Outperforms state-of-the-art methods based on mean squared error.

Abstract

The prediction of future climate scenarios under anthropogenic forcing is critical to understand climate change and to assess the impact of potentially counter-acting technologies. Machine learning and hybrid techniques for this prediction rely on informative metrics that are sensitive to pertinent but often subtle influences. For atmospheric dynamics, a critical part of the climate system, no well established metric exists and visual inspection is currently still often used in practice. However, this "eyeball metric" cannot be used for machine learning where an algorithmic description is required. Motivated by the success of intermediate neural network activations as basis for learned metrics, e.g. in computer vision, we present a novel, self-supervised representation learning approach specifically designed for atmospheric dynamics. Our approach, called AtmoDist, trains a neural network on a simple, auxiliary task: predicting the temporal distance between elements of a randomly shuffled sequence of atmospheric fields (e.g. the components of the wind field from reanalysis or simulation). The task forces the network to learn important intrinsic aspects of the data as activations in its layers and from these hence a discriminative metric can be obtained. We demonstrate this by using AtmoDist to define a metric for GAN-based super resolution of vorticity and divergence. Our upscaled data matches both visually and in terms of its statistics a high resolution reference closely and it significantly outperform the state-of-the-art based on mean squared error. Since AtmoDist is unsupervised, only requires a temporal sequence of fields, and uses a simple auxiliary task, it has the potential to be of utility in a wide range of applications.