The use of idealised experiments in testing a new convective parametrization: Performance of CoMorph-A

Article


Lavender, Sally L., Stirling, Alison J., Whitall, Michael, Stratton, Rachel A., Daleu, Chimene L., Plant, Robert S., Lock, Adrian and Gu, Jian-Feng. 2024. "The use of idealised experiments in testing a new convective parametrization: Performance of CoMorph-A." Quarterly Journal of the Royal Meteorological Society. 150 (760), pp. 1581-1600. https://doi.org/10.1002/qj.4660
Article Title

The use of idealised experiments in testing a new convective parametrization: Performance of CoMorph-A

ERA Journal ID1987
Article CategoryArticle
AuthorsLavender, Sally L., Stirling, Alison J., Whitall, Michael, Stratton, Rachel A., Daleu, Chimene L., Plant, Robert S., Lock, Adrian and Gu, Jian-Feng
Journal TitleQuarterly Journal of the Royal Meteorological Society
Journal Citation150 (760), pp. 1581-1600
Number of Pages20
Year2024
PublisherJohn Wiley & Sons
Place of PublicationUnited Kingdom
ISSN0035-9009
1477-870X
Digital Object Identifier (DOI)https://doi.org/10.1002/qj.4660
Web Address (URL)https://rmets.onlinelibrary.wiley.com/doi/10.1002/qj.4660
AbstractCoMorph is a new mass-flux convection parametrization 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 numerical weather prediction (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”.
Keywordsclimate models
Contains Sensitive ContentDoes not contain sensitive content
ANZSRC Field of Research 20204101. Climate change impacts and adaptation
Byline AffiliationsCentre for Applied Climate Sciences
Met Office, United Kingdom
University of Reading, United Kingdom
Nanjing University, China
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