Data-Driven Equation Discovery of Ocean Mesoscale Closures

Laure Zanna, Thomas Bolton

Research output: Contribution to journalArticlepeer-review

Abstract

The resolution of climate models is limited by computational cost. Therefore, we must rely on parameterizations to represent processes occurring below the scale resolved by the models. Here, we focus on parameterizations of ocean mesoscale eddies and employ machine learning (ML), namely, relevance vector machines (RVMs) and convolutional neural networks (CNNs), to derive computationally efficient parameterizations from data, which are interpretable and/or encapsulate physics. In particular, we demonstrate the usefulness of the RVM algorithm to reveal closed-form equations for eddy parameterizations with embedded conservation laws. When implemented in an idealized ocean model, all parameterizations improve the statistics of the coarse-resolution simulation. The CNN is more stable than the RVM such that its skill in reproducing the high-resolution simulation is higher than the other schemes; however, the RVM scheme is interpretable. This work shows the potential for new physics-aware interpretable ML turbulence parameterizations for use in ocean climate models.

Original languageEnglish (US)
Article numbere2020GL088376
JournalGeophysical Research Letters
Volume47
Issue number17
DOIs
StatePublished - Sep 16 2020

Keywords

  • climate modeling
  • machine learning
  • ocean turbulence
  • subgrid parameterization

ASJC Scopus subject areas

  • Geophysics
  • Earth and Planetary Sciences(all)

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