PPT Slide
Notes:
Jeff Brook’s measurements also include concentrations of strong acidity associated with the fine particle concentrations. Note that very high acidity levels were observed at the remote Keji site on August 25 and 26, even though sulfate levels were only moderately high (about 15 micrograms per cubic meter) at Keji on these dates.
The relatively high ratio of acidity to sulfate suggests a relatively low degree of neutralization (by ammonium) of the sulfuric acid aerosol. Since ammonia emissions are relatively ubiquitous over land, a poorly neutralized sulfate aerosol is not consistent with the concept of very long-range transport of acidity (for example from the Midwestern US to Maritime Canada).