A Perspective on the Role of the Dynamical Core in the Development of Weather and Climate Models
 Richard B. Rood
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Abstract
This chapter aims to place the dynamical core of weather and climate models into the context of the model as a system of components. Building from basic definitions that describe models and their applications, the chapter details the component structure of a presentday atmospheric model. This facilitates the categorization of model components into types and the basic description of the dynamical core. An important point in this categorization is that the separation between ‘dynamics’ and ‘physics’ is not always clear; there is overlap. This overlap becomes more important as the spatial resolution of models increases, with resolved scales and parameterized processes becoming more conflated. From this categorization an oversimple, intuitive list of the parts of a dynamical core is made. Following this, the equations of motion are analyzed, and the designbased evolution of the dynamical core described in Lin (2004, Monthly Weather Review) is discussed. This leads to a more complete description of the dynamical core, which explicitly includes the specification of topography and grids on which the equations of motion are solved. Finally, a set of important problems for future consideration is provided. This set emphasizes the modeling system as a whole and the need to focus on physical consistency, on the scientific investigation of coupling, on the representation of physical and numerical dissipation (subscale mixing and filtering), and on the robust representation of divergent flows. This systembased approach of model building stands in contrast to a componentbased approach and influences the details of component algorithms.
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 Title
 A Perspective on the Role of the Dynamical Core in the Development of Weather and Climate Models
 Book Title
 Numerical Techniques for Global Atmospheric Models
 Pages
 pp 513537
 Copyright
 2011
 DOI
 10.1007/9783642116407_15
 Print ISBN
 9783642116391
 Online ISBN
 9783642116407
 Series Title
 Lecture Notes in Computational Science and Engineering
 Series Volume
 80
 Series ISSN
 14397358
 Publisher
 Springer Berlin Heidelberg
 Copyright Holder
 SpringerVerlag Berlin Heidelberg
 Additional Links
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 Editors

 Peter Lauritzen ^{(ID1)}
 Christiane Jablonowski ^{(ID2)}
 Mark Taylor ^{(ID3)}
 Ramachandran Nair ^{(ID4)}
 Editor Affiliations

 ID1. Atmospheric Research, Dept. Climate/Global Dyn., National Center for
 ID2. Dept. Atmospheric, Oceanic &, Space Sciences, University of Michigan
 ID3. Organization 1433, MS0370, Sandia National Laboratories
 ID4. (NCAR), Inst. for Mathematics Applied to, National Center for Atmospheric Research
 Authors

 Richard B. Rood ^{(1)}
 Author Affiliations

 1. Department of Atmospheric, Oceanic and Space Sciences, University of Michigan, 2455 Hayward Street, Ann Arbor, MI, 48109, USA
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