The problem of airflow over and around mountains, as originally proposed by J. Charney, R. Hide, F. Mesinger, and G. Goetz, was approved in 1978 as a subprogram of the Global Atmospheric Research Program (GARP) by the Joint Organizing Committee (JOC) of the International Council of Scientific Unions (ICSU) and the World Meteorological Organization (WMO).3 ALPEX will be the field project of this subprogram and, as the name indicates, the general area of the Alps has been selected as its site. The primary observing period will be during March and April 1982. ALPEX will complete the series of large international field projects of GARP (UCAR, 1980; ICSU/WMO, 1980e).
Four years ago, our report on the Global Atmospheric Research Program (Perry, 1975) was written while an observational armada assembled for the GARP Atlantic Tropical Experiment (GATE). Now, the data resulting from that massive effort have been archived and serve as raw material for a still‐growing body of research on the tropical atmosphere. Again we write on the eve of a still more audacious adventure: The Global Weather Experiment, as we now term the First GARP Global Experiment (FGGE). Designed to advance our ability to predict weather and our understanding of climate, this massive international undertaking will similarly nourish research throughout the world in the global problems of weather and climate.
Results of tests for the optimum over-relaxation coefficients in the numerical relaxation of the omega equation we presented. One case considers a strong upper-level development for tests on a fixed grid using one-, two-, and three-dimensional forms of the omega equation. In the other case of a "classical storm" the omega equation is relaxed in its three-dimensional form using several different horizontal grids.In the threedimensional tests, the observed over-relaxation coefficients are found to be less than the values given by the theory for all grid sizes considered. A sharp cut-off is found to occur shortly after the optimum over-relaxation value is reached regardless of the number of dimensions of the equation or the size of the grid.For the one-and two-dimensional tests, the relaxation scheme agreesv ery well with theory.
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