A Long-Time-Step-Permitting Tracer Transport Model on the Regular Latitude–Longitude Grid  

作　　者：Jianghao LI Li DONG 

机构地区：[1]Key Laboratory of Earth System Modeling and Prediction,China Meteorological Administration,Beijing 100081,China [2]State key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics(LASG),Institute of Atmospheric Physics(IAP),Chinese Academy of Sciences,Beijing 100029,China [3]State Key Laboratory of Severe Weather(LaSW),Chinese Academy of Meteorological Sciences,China Meteorological Administration,Beijing 100081,China [4]College of Earth and Planetary Sciences,University of Chinese Academy of Sciences,Beijing 100049,China

出　　处：《Advances in Atmospheric Sciences》2024年第3期493-508,共16页大气科学进展（英文版）

基　　金：jointly supported by the National Natural Science Foundation of China (Grant No.42075153);the Young Scientists Fund of the Earth System Modeling and Prediction Centre (Grant No. CEMC-QNJJ-2022014)。

摘　　要：If an explicit time scheme is used in a numerical model, the size of the integration time step is typically limited by the spatial resolution. This study develops a regular latitude–longitude grid-based global three-dimensional tracer transport model that is computationally stable at large time-step sizes. The tracer model employs a finite-volume flux-form semiLagrangian transport scheme in the horizontal and an adaptively implicit algorithm in the vertical. The horizontal and vertical solvers are coupled via a straightforward operator-splitting technique. Both the finite-volume scheme's onedimensional slope-limiter and the adaptively implicit vertical solver's first-order upwind scheme enforce monotonicity. The tracer model permits a large time-step size and is inherently conservative and monotonic. Idealized advection test cases demonstrate that the three-dimensional transport model performs very well in terms of accuracy, stability, and efficiency. It is possible to use this robust transport model in a global atmospheric dynamical core.

关 键 词：tracer transport numerical stability latitude–longitude grid 

分 类 号：P435[天文地球—大气科学及气象学]