Slide 27 of 31
Notes:
The backward HY-SPLIT trajectories displayed here are calculated (provided by Paul Wishinski, VT DEC) for 3 PM arrival times at several of Jeff Brooks sites on the days when peak fine mass and sulfate concentrations were recorded at each site. For Windsor, Toronto and Montreal, their highest concentrations are associated with (markedly similar) flows which had previously circulated over an area of the eastern US including both the Central Atlantic Coast and Ohio River Valley.
The Kejimkujic trajectory on 8/26/92 is more easterly and has not passed over the high sulfur-emitting areas of the Midwestern US. For more than a day prior to arrival at Keji, the trajectory traveled over water (where sources of sulfur and ammonia are minimal. Perhaps these factors can help account for the unique combination of relatively lower sulfate, but higher acidity at Keji compared to the other sites.
