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Scale-aware parameterization of cloud fraction and condensate for a global atmospheric model machine-learnt from coarse-grained kilometer-scale simulations
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  • Cyril Julien Morcrette,
  • Tobias Cave,
  • Helena Reid,
  • Joana D da Silva Rodrigues,
  • Teo Deveney,
  • Lisa Kreusser,
  • Kwinten Van Weverberg,
  • Chris Budd
Cyril Julien Morcrette
Met Office

Corresponding Author:[email protected]

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Tobias Cave
University of Bath Department of Mathematical Sciences
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Helena Reid
Met Office
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Joana D da Silva Rodrigues
Met Office
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Teo Deveney
University of Bath Department of Mathematical Sciences
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Lisa Kreusser
University of Bath Department of Mathematical Sciences
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Kwinten Van Weverberg
Department of Geography
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Chris Budd
University of Bath Department of Mathematical Sciences
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Abstract

Kilometer grid-length simulations over a variety of different locations worldwide are used as training data for a deep-learning model designed to predict clouds in a global climate model. The inputs to the neural network are profiles of temperature, humidity and pressure from the high-resolution model, averaged to the scale of the climate model. The outputs are profiles of cloud fraction, liquid water content and ice water content. The high-resolution data is coarse-grained to a range of sizes, allowing the model to learn how the cloud formation depends on the size of the area being considered. The machine-learnt cloud cover and condensate scheme is coupled to a global climate model and used to run multi-year simulations where the clouds predicted by the neural-network are fully interacting with the rest of the model.
22 Aug 2024Submitted to ESS Open Archive
25 Aug 2024Published in ESS Open Archive