Modelling the diurnal cycle of tropical convection across the ‘grey zone’
作者： K. J. Pearson , G. M. S. Lister , C. E. Birch , R. P. Allan , R. J. Hogan
DOI: 10.1002/QJ.2145
关键词: Convection 、 Climatology 、 Magnitude (mathematics) 、 Parametrization (atmospheric modeling) 、 Geology 、 Unified Model 、 Range (statistics) 、 Geostationary Earth Radiation Budget 、 Diurnal cycle 、 Cloud fraction
摘要: We present the results of simulations carried out with Met Office Unified Model at 12, 4 and 1.5 km resolution for a large region centred on West Africa using several different representations convection processes. These span range resolutions from much coarser than size processes to cloud-system-resolving thus encompass intermediate ‘grey zone’. The diurnal cycle in extent convective regions models is tested against observations Geostationary Earth Radiation Budget instrument Meteosat-8. By this measure, two best-performing are 12 model without parametrization, Smagorinsky-style subgrid-scale mixing all three dimensions, simulation two-dimensional Smagorinsky mixing. Of these, produces better match magnitude total cloud fraction but one timing its peak value. suggest that previously reported improvement representation organization compared standard configuration principally result scheme employed rather improved per se. details implications high-resolution discussed.
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