A crosswind integrated K-model with wind- and K-profiles described by Monin-Obukhov similarity expressions is solved for a continuous surface release to yield the vertical spread of the plume as a function of the surface roughness z0 and the Monin-Obukhov length L for a given downwind distance. The vertical spread of the plume is translated into σz, and lines were traced in a (z0, L−) plane for which the σz of the K-model matched the corresponding σz of Pasquill's system. By this technique a new classification scheme is constructed. Knowing z0 and L, the scheme tells which σz curve in the Pasquill system should be used to describe the dispersion. This dispersion classification scheme is used to organize 3 years of data from two meteorological masts, one placed directly at a shoreline and the other roughly 1 km inland. Differences in the dispersion climatology over land and water are studied by averaging the data selectively. The large differences for water and land surfaces between the seasonal and diurnal variation of the dispersion class distributions are illustrated. It is found that the water surface influences the dispersion climatology as far as 20 km inland.