Studies on Numerical Modeling and Modification of Cyclone Scale Precipitation.
Final rept. 15 Sep 72-31 Dec 74,
MICHIGAN UNIV ANN ARBOR DEPT OF ATMOSPHERIC AND OCEANIC SCIENCE
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A fine-mesh limited area model has been developed both to predict precipitation over a limited geographic region, and to be utilized in experiments with precipitation modification. The model utilizes the primitive equations, incorporates fifteen levels in the vertical and has a basic grid length of 80 km. It shows many of the features of current models of its type, but lacks resolution in the boundary layer. Lateral boundary conditions are specified when needed from a data set which also provides initial conditions and comparisons for the forecasts. Finite-difference integrations are performed but spectral techniques are studied. Forecasts with the model show some fidelity to observations but some short-comings also. Setting one integration as a control, a number of experiments were performed with model modifications and compared to the control. In all cases, modification did not substantially alter the flow field over a 24 hour period.