Abstract
With the increase of horizontal and vertical resolutions of the atmospheric model, stronger vertical motions can be resolved, thus the time step will be severely restricted by the stability constraint of vertical transport. The vertical moist advection integration procedure of a global atmospheric model (Global-to-Regional Integrated forecast SysTem; GRIST) is modified to implement an adaptively implicit vertical advection algorithm. Numerical tests at increasing degrees of complexity including three idealized-flow cases and a real-world modeling case are performed. The results demonstrate that the adaptively implicit advection algorithm allows a larger time step in the presence of certain extreme conditions featured by strong vertical velocity. This benefits the use of higher vertical resolutions and relatively larger time-step choices. It leads to improved robustness compared to the original explicit algorithm. In the idealized tests, the performance of this adaptively implicit method is slightly more diffusive than the fully explicit advection. This feature also has an effect on the real-world simulation. The adaptively implicit method tends to reduce the strength of certain maximum rainfall in the simulated precipitation field. Overall, this study demonstrates the improved stability and robustness of a global model by using this adaptively implicit advection method at the cost of small additional implicit diffusion.
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Data for this study are available from the corresponding author upon request.
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This research was supported by the National Science Foundation of China (41875135).
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Li, J., Zhang, Y. Enhancing the stability of a global model by using an adaptively implicit vertical moist transport scheme. Meteorol Atmos Phys 134, 55 (2022). https://doi.org/10.1007/s00703-022-00895-5
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DOI: https://doi.org/10.1007/s00703-022-00895-5