the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Using a single column model (SGRIST1.0) for connecting model physics and dynamics in the Global-to-Regional Integrated forecast SysTem (GRIST-A20.8)
Abstract. A single column model (SGRIST1.0) is developed as a tool for coupling a full-physics package (from Community Atmosphere Model, version 5 (CAM5)) to the Global-to-Regional Integrated forecast System (GRIST). In a two-step approach, the full-physics package is first isolated and coupled to SGRIST1.0 for reducing the uncertainties associated with model physics and assessing its behavior, then assimilated by the model dynamical framework. In the first step, SGRIST1.0 serves as a tool for evaluating the physical parameterization suite in the absence of 3D dynamics. Three single column model test cases, including the tropical deep convection, shallow convection, and stratocumulus, demonstrate that the parameterization suite mimics the behaviors in the observations and the reference model (SCAM) outputs. Cloud fraction, cloud liquid, and some other micro- and macro-physical variables are sensitive to the model time step, suggesting time-step dependency of the corresponding parameterization schemes. The second step couples the physics package to the 3D dynamical modeling system, and the verified parameterization suite works well in GRIST. Two physics-dynamics coupling strategies are examined and found to have a clear impact on the intensity of the simulated storm. The incremental operator splitting strategy (ptend_f1_f1), produces a weaker storm than the pure operator splitting strategy (ptend_f2_sudden). Comparing these two splitting approaches, the ptend_f2_sudden coupling strategy has higher large-step stability than the ptend_f1_f1 option, but the intensity of the simulated storm is substantially reduced by ptend_f2_sudden provided that the time step becomes quite large. Some detailed model configuration strategies are suggested when using the CAM5 parameterization suite in GRIST.
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RC1: 'Review of ”Using a single column model (SGRIST1.0) for connecting model physics and dynamics in the Global-to-Regional Integrated forecast SysTem (GRIST-A20.8)” by Xiaohan Li, Yi Zhang, Xindong Peng, and Jian Li', Anonymous Referee #1, 16 Dec 2020
- AC1: 'Reply on RC1', Xiaohan Li, 18 Mar 2021
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RC2: 'Review of Li et al., gmd-2020-254', Anonymous Referee #2, 12 Feb 2021
- AC2: 'Reply on RC2', Xiaohan Li, 18 Mar 2021
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RC1: 'Review of ”Using a single column model (SGRIST1.0) for connecting model physics and dynamics in the Global-to-Regional Integrated forecast SysTem (GRIST-A20.8)” by Xiaohan Li, Yi Zhang, Xindong Peng, and Jian Li', Anonymous Referee #1, 16 Dec 2020
- AC1: 'Reply on RC1', Xiaohan Li, 18 Mar 2021
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RC2: 'Review of Li et al., gmd-2020-254', Anonymous Referee #2, 12 Feb 2021
- AC2: 'Reply on RC2', Xiaohan Li, 18 Mar 2021
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Cited
5 citations as recorded by crossref.
- Evaluation of a Flexible Single Ice Microphysics and a Gaussian Probability-Density-Function Macrophysics Scheme in a Single Column Model J. Li et al. 10.3390/atmos12050638
- Impact of Revised Trigger and Closure of the Double-Plume Convective Parameterization on Precipitation Simulations over East Asia X. Li et al. 10.1007/s00376-022-2225-9
- AMIP Simulations of a Global Model for Unified Weather‐Climate Forecast: Understanding Precipitation Characteristics and Sensitivity Over East Asia Y. Zhang et al. 10.1029/2021MS002592
- Configuration and evaluation of a global unstructured mesh atmospheric model (GRIST-A20.9) based on the variable-resolution approach Y. Zhou et al. 10.5194/gmd-13-6325-2020
- Assessment of Typhoon Precipitation Forecasts Based on Topographic Factors X. Chen et al. 10.3390/atmos14111607