The performance of the CoMorph-A convection package in global simulations with the Met Office Unified Model
Article
Lock, A. P., Whitall, M., Stirling, A. J., Williams, K., Lavender, S. L., Morcrette, C., Matsubayashi, K., Field, P. R., Martin, G., Willett, M. and Heming, J.. 2024. "The performance of the CoMorph-A convection package in global simulations with the Met Office Unified Model." Quarterly Journal of the Royal Meteorological Society. 150 (763), pp. 3527-3543. https://doi.org/10.1002/qj.4781
| Article Title | The performance of the CoMorph-A convection package in global simulations with the Met Office Unified Model |
|---|---|
| ERA Journal ID | 1987 |
| Article Category | Article |
| Authors | Lock, A. P., Whitall, M., Stirling, A. J., Williams, K., Lavender, S. L., Morcrette, C., Matsubayashi, K., Field, P. R., Martin, G., Willett, M. and Heming, J. |
| Journal Title | Quarterly Journal of the Royal Meteorological Society |
| Journal Citation | 150 (763), pp. 3527-3543 |
| Number of Pages | 17 |
| Year | 2024 |
| Publisher | John Wiley & Sons |
| Place of Publication | United Kingdom |
| ISSN | 0035-9009 |
| 1477-870X | |
| Digital Object Identifier (DOI) | https://doi.org/10.1002/qj.4781 |
| Web Address (URL) | https://rmets.onlinelibrary.wiley.com/doi/10.1002/qj.4781 |
| Abstract | The impact on global simulations of a new package of physical parametrizations in the Met Office Unified Model is documented. The main component of the package is an entirely new convection scheme, CoMorph. This has a mass-flux structure that allows initiation of buoyant ascent from any level and the ability for plumes of differing originating levels to coexist in a grid box. It has a different form of closure, where the mass flux of initiation is dependent on local instability, and an implicit numerical solution for detrainment that yields smooth timestep behaviour. The scheme is coupled more consistently to the cloud, microphysics, and boundary-layer parametrizations and, as a result, significant changes to these have also been made. The package, called CoMorph-A, has been tested in a variety of single-column and idealized regimes. Here we test it in global configurations and evaluate it against observations using a range of standard metrics. Overall it is found to perform well against the control. Biases in the climatologies of the radiative fluxes are significantly reduced across the Tropics and subtropics, tropical and extratropical cyclone statistics are improved, and the Madden–Julian oscillation and other propagating tropical waves are strengthened. It also improves overall scores in numerical weather prediction trials, without revisions to the data assimilation. There is still work to do to improve the diurnal cycle of precipitation over land, where the peak remains too close to the middle of the day. |
| Keywords | convection; evaluation; global; parametrization; unified model |
| Contains Sensitive Content | Does not contain sensitive content |
| ANZSRC Field of Research 2020 | 370108. Meteorology |
| Public Notes | The accessible file is the accepted version of the paper. Please refer to the URL for the published version. |
| Byline Affiliations | Met Office, United Kingdom |
| Centre for Applied Climate Sciences | |
| Japan Meteorological Agency, Japan |
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