Evaluation of multi-season convection-permitting atmosphere - mixed layer ocean simulations of the Maritime Continent

Howard, E., Woolnough, S. ORCID: https://orcid.org/0000-0003-0500-8514, Klingaman, N. ORCID: https://orcid.org/0000-0002-2927-9303, Shipley, D. ORCID: https://orcid.org/0000-0002-7812-8309, Sanchez, C., Peatman, S. C., Birch, C. E. and Matthews, A. J. (2024) Evaluation of multi-season convection-permitting atmosphere - mixed layer ocean simulations of the Maritime Continent. Geoscientific Model Development, 17 (9). pp. 3815-3837. ISSN 1991-9603 doi: 10.5194/gmd-17-3815-2024

Abstract/Summary

A multi-season convection permitting regional climate simulation of the Maritime Continent using the Met Office Unified Model with 2.2-km grid spacing is presented and evaluated. The simulations pioneer the use of atmosphere-ocean coupling with the multi-column K profile parametrisation (KPP) mixed layer ocean model in atmospheric convection permitting climate simulations. Comparisons are made against a convection parametrised simulation in which it is nested, and which in turn derives boundary conditions from ERA5 reanalysis. This paper describes the configuration, performance of the mean state and variability of the two simulations compared against observational datasets. The models both have minor sea surface temperature (SST) and wet precipitation biases. The diurnal cycle, representation of equatorial waves and relationship between SST and precipitation are all improved in the convection permitting model compared to the convection parametrised model. The MJO is present in both models with a faster than observed propagation speed. However, it is unclear whether fidelity of the MJO simulation is inherent to the model or whether it predominantly arises from the forcing at the boundaries.

Item Type	Article
URI	https://reading-clone.eprints-hosting.org/id/eprint/115851
Item Type	Article
Refereed	Yes
Divisions	Science > School of Mathematical, Physical and Computational Sciences > NCAS Science > School of Mathematical, Physical and Computational Sciences > Department of Meteorology
Publisher	European Geosciences Union
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