Slayt 1 - RTC, Regional Training Centre - Turkey

4-Grid Point ModelsIn the real atmosphere, advection often occurs at very small scales. For example, seabreezes have strong advection but are usually confined to distances of only a fewtens of kilometers from shore. In our example, the grid points are spaced about 80km apart. This lack of resolution introduces errors into the solution of the finitedifference equation. The greater the distance between grid points, the less likely themodel will be able to detect small-scale variations in the temperature and moisturefields. Deficiencies in the ability of the finite difference approximations to calculategradients and higher order derivatives exactly are called truncation errors.