Abstract
Aerosol chemistry, precipitation and visibility parameters are currently being measured at Big Bend National Park in Texas. This is part of a large-scale air resource evaluation program which the National Park Service is sponsoring in several southwestern national parks and monuments to determine the potential impact of local and distant pollutant sources on the environmental quality within these areas. Analysis of aerosol samples collected at six sites in the Southwest indicates that soil-derived components, organic materials and the acid-base ions of sulfate, nitrate, and ammonium are the major constituents of suspended airborne particulate matter in the remote areas of the arid region. Comparison of particulate matter chemistry and precipitation chemistry data at Big Bend National Park shows consistent features which indicate that the airborne alkaline soil material and NH3 largely neutralize the atmospheric acidic species of H2SO4 and HNO3. Given the similarity of the particulate matter composition and loading at the other monitoring sites, it is suggested that the trace chemical composition of precipitation will be similar in many remote regions of the Southwest.
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Derrick, M.R., Moyers, J.L., Yarborough, K.A. et al. Aerosol and precipitation chemistry relationships at big bend national park. Water Air Soil Pollut 21, 171–181 (1984). https://doi.org/10.1007/BF00163622
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DOI: https://doi.org/10.1007/BF00163622