Climate Modeling (Meteo 523)
Project One: Representation of the Atmosphere Through Parameterizations

The importance of parameterizations is explored by focusing on their role in numerical models, the underlying assumptions in their implementation and their representation of physical processes. There are three components to this project:

  • Description of a physical model: Numerical models are built on conceptual models of how the atmosphere works. Hence, in order to successfully simulate something, we must have evaluated the importance of potential forcings. In this component of the project, I expect you to come up with (i) an annotated diagram or one page written description of how some process in the atmosphere works; and (ii) to present this in a 5-10 minute oral presentation. Completed January 1999

  • Documentation of a physical parameterization: Here you will compare your physical model to a numerical realization based on work by experts in the field. You will give a 15 minute presentation to the class on the essentials of a single parameterization presently in use. Presentations for this will be given in class on Thursday 18 February and Thursday 25 February 1999.

  • Extension of that physical parameterization: You are now in control of an infinite budget and can make a quantum leap in parameterization results. Describe (in up to 5 pages - you may have additional room for figures) how you would advance the science. This paper is due on Thursday, 18 March at the beginning of class. We will use these papers as the basis of class discussion on priorities for model development.

    Specialty Topics and Parameterization Chosen

    Persa BatraVegetation/climate interactions Sellers et al. (1986)
    Jeff ChagnonBoundary layer momentum flux Holtslag and Boville (1993), Section 3a
    Giang NongOceanic surface heat flux Rahmstorf and Willebrand (1995)
    Dave ReuschSea ice Weatherly et al. (1998)
    Manajit SenguptaCloud effects on climate Del Genio (1996)
    Phillip SpencerDeep, moist convection Betts (1986)

    This project will be the first of two major projects. There are three phases to this first project and we are presently (8 Feb 1999) in Phase Two: Exploring parameterizations presently used in GCMs.

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    Last Updated: 17 February 1999