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RISEffects of Using a Posteriori Methods for the Conservation of Integral Invariants
Publisher: American Meteorological Society
Abstract: An examination is made on the nature and effect of using a posteriors adjustments on nonconservative finite-difference schemes to enforce integral invariants of the corresponding analytic system. Using the one-dimensional ...
A Two-Step Scheme for the Advection Equation with Minimized Dissipation and Dispersion Errors
Publisher: American Meteorological Society
Abstract: A two-step advection scheme of the Lax-Wendroff type is derived which has accuracy and phase characteristics similar to that of a third-order scheme. The scheme is exactly third-order accurate in time and space for uniform ...
High-Latitude Filtering in Global Grid-Point Models
Publisher: American Meteorological Society
Abstract: Latitude-longitude grid-point models with explicit time schemes require filtering of unstable short waves at high latitudes to avoid the use of prohibitively short time steps. Using a shallow water model and a Rossby?Haurwitz ...
Impact of a Semi-Lagrangian and an Eulerian Dynamical Core on Climate Simulations
Publisher: American Meteorological Society
Abstract: 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 ...
The Climatology of Parameterized Physical Processes in the GEOS-1 GCM and Their Impact on the GEOS-1 Data Assimilation System
Publisher: American Meteorological Society
Abstract: The Goddard Earth Observing System (GEOS) General Circulation Model (GCM) is part of the GEOS Data Assimilation System (DAS), which is being developed at the Goddard Data Assimilation Office for the production of climate ...
The Stability of Incremental Analysis Update
Publisher: American Meteorological Society
Abstract: AbstractA recent attempt to downscale the 50-km MERRA-2 analyses to 7 km revealed an instability associated with the incremental analysis update (IAU) procedure that has thus far gone unnoticed. A theoretical study based ...
Sensitivity of Age-of-Air Calculations to the Choice of Advection Scheme
Publisher: American Meteorological Society
Abstract: The age of air has recently emerged as a diagnostic of atmospheric transport unaffected by chemical parameterizations, and the features in the age distributions computed in models have been interpreted in terms of the ...
A Uniform- and Variable-Resolution Stretched-Grid GCM Dynamical Core with Realistic Orography
Publisher: American Meteorological Society
Abstract: The impact of introducing a realistic orographic forcing into a uniform- and variable-resolution stretched-grid GCM dynamical core is investigated by performing long-term and medium-range integrations. Comparisons are made ...
A Multiyear Ensemble Simulation of the U.S. Climate with a Stretched-Grid GCM
Publisher: American Meteorological Society
Abstract: Multiyear (1987?97) limited ensemble integrations using a stretched-grid GCM, previously developed and experimented with by the authors, are employed for U.S. regional climate simulations. The ensemble members (six in ...
A Finite-Difference GCM Dynamical Core with a Variable-Resolution Stretched Grid
Publisher: American Meteorological Society
Abstract: A finite-difference atmospheric model dynamics, or dynamical core using variable resolution, or stretched grids, is developed and used for regional?global medium-term and long-term integrations. The goal of the study is ...