The use of idealised experiments in testing a new convective parameterization: performance of CoMorph-A

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Lavender, S. L., Stirling, A. J., Whitall, M., Stratton, R., Daleu, C. ORCID: https://orcid.org/0000-0003-2075-4902, Plant, R. S. ORCID: https://orcid.org/0000-0001-8808-0022, Lock, A. and Gu, J.-F. ORCID: https://orcid.org/0000-0002-7752-4553 (2024) The use of idealised experiments in testing a new convective parameterization: performance of CoMorph-A. Quarterly Journal of the Royal Meteorological Society. ISSN 1477-870X (In Press)

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Abstract/Summary

CoMorph is a new mass-flux convection parameterization under development at the Met Office designed for use within the Unified Model and its successor model, LFRic. Use of a three-dimensional idealised model enables controlled tests of the performance of the scheme across different regimes. This includes the interaction between the physical parametrizations and the resolved dynamics, allowing study of the emergent organisation of convection on the resolved scale. A selection of well-known cases is revisited here, with the purpose of documenting the extent to which CoMorph captures a range of important, but challenging behaviour such as the diurnal cycle and sensitivity to tropospheric moisture. Simulations using CoMorph-A, a new physics package, that has been demonstrated to perform well at NWP and climate scales, are compared against the current global atmosphere configuration and high-resolution results. In addition to an entirely new convection scheme, the package of changes includes significant changes to the cloud, microphysics, and boundary layer parametrizations. Recognising that CoMorph-A is the first version of a scheme that will continue to be substantially developed and to obtain good performance, compromises in tuning have had to be made. These idealised tests therefore show what works well in this configuration, and what areas will require further work. As such, it is quite a demanding testbed and could be viewed as some of the equipment required for a 'convective playground'.

Item Type:	Article
Refereed:	Yes
Divisions:	Science > School of Mathematical, Physical and Computational Sciences > National Centre for Earth Observation (NCEO) Science > School of Mathematical, Physical and Computational Sciences > Environmental Systems Science Centre Science > School of Mathematical, Physical and Computational Sciences > Department of Mathematics and Statistics Science > School of Mathematical, Physical and Computational Sciences > Department of Computer Science Science > School of Mathematical, Physical and Computational Sciences > NCAS Science > School of Mathematical, Physical and Computational Sciences > Department of Meteorology
ID Code:	114557
Uncontrolled Keywords:	convection parameterization, idealised modelling, cloud resolving models, climate models, diurnal cycle
Publisher:	Royal Meteorological Society

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References

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The use of idealised experiments in testing a new convective parameterization: performance of CoMorph-A

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