Climbing down Charney's ladder: machine learning and the post-Dennard era of computational climate science
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Climbing down Charney's ladder: machine learning and the post-Dennard era of computational climate science

  • 2021

  • By Balaji, V. ORCID ICON IMG
  • Source: Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences, 379(2194)
Filetype[PDF-815.64 KB]


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Details:

  • Journal Title:
    Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences
  • Personal Author:
    Balaji, V. ORCID ICON IMG
  • NOAA Program & Office:
  • Description:
    The advent of digital computing in the 1950s sparked a revolution in the science of weather and climate. Meteorology, long based on extrapolating patterns in space and time, gave way to computational methods in a decade of advances in numerical weather forecasting. Those same methods also gave rise to computational climate science, studying the behaviour of those same numerical equations over intervals much longer than weather events, and changes in external boundary conditions. Several subsequent decades of exponential growth in computational power have brought us to the present day, where models ever grow in resolution and complexity, capable of mastery of many small-scale phenomena with global repercussions, and ever more intricate feedbacks in the Earth system. The current juncture in computing, seven decades later, heralds an end to what is called Dennard scaling, the physics behind ever smaller computational units and ever faster arithmetic. This is prompting a fundamental change in our approach to the simulation of weather and climate, potentially as revolutionary as that wrought by John von Neumann in the 1950s. One approach could return us to an earlier era of pattern recognition and extrapolation, this time aided by computational power. Another approach could lead us to insights that continue to be expressed in mathematical equations. In either approach, or any synthesis of those, it is clearly no longer the steady march of the last few decades, continuing to add detail to ever more elaborate models. In this prospectus, we attempt to show the outlines of how this may unfold in the coming decades, a new harnessing of physical knowledge, computation and data.
  • Keywords:
  • Source:
    Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences, 379(2194)
  • DOI:
  • Document Type:
    Journal Article
  • Funding:
    Grant no. NA18OAR4320123
  • Rights Information:
    CC BY-NC-ND
  • Compliance:
    Submitted
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