Held-Suarez simulations with the Community Atmosphere Model Spectral Element (CAM-SE) dynamical core: a global axial angular momentum analysis using Eulerian and floating Lagrangian vertical coordinates
نویسندگان
چکیده
In this paper an analysis of the global AAM conservation properties of NCAR’s Community Atmosphere Model Spectral Element (CAM-SE) dynamical core under HeldSuarez forcing is presented. It is shown that the spurious sources/sinks of AAM in CAMSE are three orders of magnitude smaller than the parameterized (physical) sources/sinks. The effect on AAM conservation by changing various numerical aspects of the dynamical core (e.g., different vertical coordinates, reduced formal order of accuracy, increased dissipation and decreased divergence damping) is investigated. In particular it is noted that changing from Eulerian (hybrid-sigma) to floating Lagrangian vertical coordinates does not alter the global AAM conservation properties of CAM-SE.
منابع مشابه
CAM-SE: A scalable spectral element dynamical core for the Community Atmosphere Model
The Community Atmosphere Model (CAM) version 5 includes a spectral element dynamical core option from NCAR’s High-Order Method Modeling Environment. It is a continuous Galerkin spectral finite element method designed for fully unstructured quadrilateral meshes. The current configurations in CAM are based on the cubedsphere grid. The main motivation for including a spectral element dynamical cor...
متن کاملImpact of a Semi-Lagrangian and an Eulerian Dynamical Core on Climate Simulations
To assess the impact of dynamical formulation on climate simulations, a semi-Lagrangian and an Eulerian dynamical core have been used for 5-yr climate simulations with the same physical parameterizations. The comparison of the climate simulations is focused on various eddy statistics (the study of time-mean states from the simulations has been published in a previous paper). Significant differe...
متن کاملAssessing Tracer Transport Algorithms and the Impact of Vertical Resolution in a Finite-Volume Dynamical Core
Modeling the transport of trace gases is an essential part of any atmospheric model. The tracer transport scheme in the Community Atmosphere Model finite-volume dynamical core (CAM-FV), which is part of the National Center for Atmospheric Research’s (NCAR’s) Community Earth System Model (CESM1), is investigated using multidimensional idealized advection tests. CAM-FV’s tracer transport algorith...
متن کاملA ‘‘Vertically Lagrangian’’ Finite-Volume Dynamical Core for Global Models
A finite-volume dynamical core with a terrain-following Lagrangian control-volume discretization is described. The vertically Lagrangian discretization reduces the dimensionality of the physical problem from three to two with the resulting dynamical system closely resembling that of the shallow water system. The 2D horizontalto-Lagrangian-surface transport and dynamical processes are then discr...
متن کاملDownscale cascades in tracer transport test cases: an intercomparison of the dynamical cores in the Community Atmosphere Model CAM5
The accurate modeling of cascades to unresolved scales is an important part of the tracer transport component of dynamical cores of weather and climate models. This paper aims to investigate the ability of the advection schemes in the National Center for Atmospheric Research’s Community Atmosphere Model version 5 (CAM5) to model this cascade. In order to quantify the effects of the different ad...
متن کامل