Monday, 10 January 2000: 2:45 PM
During the early summer of 1998, the Department of Energy's Atmospheric Chemistry Program conducted tropospheric field studies in Phoenix, Arizona. As part of that effort, measurements were taken at one-minute intervals for a number of key pollutants, as well as UV-B radiation and temperature. Pollutants measured included NO2 and PAN by using a luminol-based chemiluminescence detector with fast gas chromatography, ozone by UV absorption, and CO by nondispersive infrared detection. These measurements were taken at a field station located near Usery Mountain Recreation Area, on a saddleback overlooking Phoenix and Mesa, Arizona. This site was found to be suitable for examining the urban plume from Phoenix during nocturnal boundary layer flow situations. During a portion of this study, the area was also affected by smoke from regional biomass burning in Mexico. This smoke resulted in the reduction of UV-B and a subsequent reduction in ozone. Low values for NO2 were also noted. These data are compared to values more usual for air masses sourced in the San Diego-Los Angeles area, which indicated long-range transport of photochemical oxidants. The results are discussed in light of the potential effects of aerosols on the air pollutants measured and the production of nitrate radical at night.
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