Slide 17 of 31
Notes:
When monitored ozone data from New Brunswick and Nova Scotia are added to this 8 hour moving average, distinct differences are observed. Observed peaks are considerably smaller in scale at those Canadian Maritime sites the farther one enters the Bay of Fundy. As has been suggested by comparisons of acid fog monitoring in the Gulf of Maine with ozone monitoring in the US and in the Maritimes, ozone is likely to be precipitated out by the large amount of AM fog that is representative along the coast of Maine, but of more suspect is the division and degradation of of the off-shore plumes as they are transported into the spillway of the St. Lawrence. (Note the Forest Hills and Fundy Park moving average cycles).
Notice how large sources of NOx produced by utility stationary sources just to the SW of Pt. Lapreau scavenge ozone during the time when other stations are monitoring their highest readings. Utility demands, wind direction and NOx output are consistent with this assumption. At the farthest downwind site, North Cape PEI, long range transport from the entire Eastern Seaboard allows O3 readings to peak very late at night.
The diurnal pattern of Halifax more closely resembles its counterparts in Maine
