Meteorological and Back Trajectory Modeling for the Rocky Mountain Atmospheric Nitrogen and Sulfur Study II

Figure 12

Source areas for TrMB modeling of ammonia. Top left is the Western US; the inset on the lower right is Colorado. County boundaries and the receptor site are shown in the inset. The numbers are the annual mean TrMB percent ammonia attribution in the numerator calculated as in the bottom row of Table 4 and the percent of back trajectory endpoints in the denominator. Values are rounded to the nearest integer; all areas had at least a fraction of a percent of the total endpoints.