Improvement of a neural network convection scheme by including triggering and evaluation in present and future climates
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arXiv
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| Hauptverfasser: | , , , |
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| Format: | Preprint |
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2025
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| _version_ | 1866918430364401664 |
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| author | Germain, Hugo Balogh, Blanka Geoffroy, Olivier Saint-Martin, David |
| author_facet | Germain, Hugo Balogh, Blanka Geoffroy, Olivier Saint-Martin, David |
| contents | In this study, we improve a neural network (NN) parameterization of deep convection in the global atmosphere model ARP-GEM. To take into account the sporadic nature of convection, we develop a NN parameterization that includes a triggering mechanism that can detect whether deep convection is active or not within a grid-cell. This new data-driven parameterization outperforms the existing NN parameterization in present climate when replacing the original deep convection scheme of ARP-GEM. Online simulations with the NN parameterization run without stability issues. Then, this NN parameterization is evaluated online in a warmer climate. We confirm that using relative humidity instead of the specific total humidity as input for the NN (trained with present data) improves the performance and generalization in warmer climate. Finally, we perform the training of the NN parameterization with data from a warmer climate and this configuration get similar results when used in simulations in present or warmer climates. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2511_05074 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Improvement of a neural network convection scheme by including triggering and evaluation in present and future climates Germain, Hugo Balogh, Blanka Geoffroy, Olivier Saint-Martin, David Atmospheric and Oceanic Physics In this study, we improve a neural network (NN) parameterization of deep convection in the global atmosphere model ARP-GEM. To take into account the sporadic nature of convection, we develop a NN parameterization that includes a triggering mechanism that can detect whether deep convection is active or not within a grid-cell. This new data-driven parameterization outperforms the existing NN parameterization in present climate when replacing the original deep convection scheme of ARP-GEM. Online simulations with the NN parameterization run without stability issues. Then, this NN parameterization is evaluated online in a warmer climate. We confirm that using relative humidity instead of the specific total humidity as input for the NN (trained with present data) improves the performance and generalization in warmer climate. Finally, we perform the training of the NN parameterization with data from a warmer climate and this configuration get similar results when used in simulations in present or warmer climates. |
| title | Improvement of a neural network convection scheme by including triggering and evaluation in present and future climates |
| topic | Atmospheric and Oceanic Physics |
| url | https://arxiv.org/abs/2511.05074 |