(BRAVO) Study: Final Report. - Desert Research Institute

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Final Report — September 2004 Table 3-6. Specialized aerosol and gaseous measurements at Big Bend. Measurement High time resolution, high sensitivity SO 2 High time resolution particulate sulfate Hourly tracer sampling PM 2.5 carbonaceous aerosol Carbon speciation by GC/MS for selected periods Gaseous nitric acid Gaseous ammonia MOUDI size resolved aerosol Various particle size measurements- differential mobility analyzer, optical particle counters, aerodynamic particle sizers Gaseous hydroperoxides Scanning electron microscopy (SEM) analysis Averaging period 1 hour 12 minutes 1 hour 24 hours 24 hours 24 hours 24 hours 24 hours seconds 1 hour 24 hours 3.4 Optical Measurements Optical measurements are made routinely at BBNP using an Optec transmissometer and an Optec ambient integrating nephelometer at a site about 5 km north of the main BRAVO monitoring location at K-Bar Ranch. For the BRAVO study, additional optical measurements were made by two additional transmissometers, two open-air Optec nephelometers, two ambient PM 2.5 Optec nephelometers, and one ambient PM 10 Optec nephelometer. The additional transmissometers were located about 0.5 km southwest of the K-Bar Ranch site. The additional nephelometers were all located at the K-Bar Ranch site. There were also five 35mm cameras and two 8mm time-lapse cameras at the south end of the new transmissometer path. The cameras gave views from the Rio Grande River Basin to the existing transmissometer site path. Additional optical instruments at the K-Bar Ranch site included two PM 2.5 Radiance Research nephelometers for which relative humidity is controlled, an aethalometer (operated with no particle cut, 2.5 µm cut and 1 µm cut inlets), and a photoacoustic light absorption instrument. The additional nephelometers were used to investigate the effects of relative humidity changes upon particle size and to quantify the light scattering by fine and coarse particles. 3.5 Meteorological Measurements Upper-air meteorological measurement sites are shown in Figure 3-4 and listed in Table 3-7. Radiosonde sites measured pressure, wind speed, wind direction, temperature, and dew point temperature, as a function of height usually twice per day at 0 and 1200 Greenwich Mean Time (7 am and 7 pm CDT). Radar wind profilers measured wind speed and direction as a function of height; data was generally reported hourly. Radar wind 3-11
Final Report — September 2004 profilers equipped with a radio acoustic sounding system (RASS) also obtained vertical profiles of virtual temperature, although usually only to 500-1,500 meters. Data from the radar wind profilers were employed in a four-dimensional data assimilation nudging of the MM5 generated wind-fields as described in Appendix 9. Figure 3-4. Upper-air meteorological sites. 3-12
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(BRAVO) Study: Final Report. - Desert Research Institute

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