Westerly
flows predominant at the Flathead with a
significant southwesterly component in the winter as shown in Figure 1.
The role of meteorology in the causes of haze
Figure 1. Normalized
residence in January (left) and August (right)
OC
in the summer is the major cause of haze at the site. Figure 2 indicates
that the flows are generally from west in the 20% worst visibility and 20%
worst OC days. Differnce and ratio maps of OC shown in Figure 3 suggest that
the major source regions of organics are north Idaho and west Washington
state.
Figure 2. Normalized
residence in 20% worst visibility (left) and 20% worst OC days (right)
