Las Vegas Ozone Study TOPAZ Data
May 31, 2013
May 31. Friday.
Clear skies, some haze in the valley in the morning. Improving visibility in the early afternoon. NE flow at Angel Peak and in the valley, which transported the Las Vegas urban plume to the SW, where the Jean site recorded 79 ppbv of O3 between 1800 and 1900 PDT. TOPAZ lidar and surface O3 monitor at Angel Peak show a slight increase in O3 from the low 60s to around 70 ppbv due to arrival of urban air. CO values rose slightly from 119 to 125 ppbv. Ozone vertical structure is similar to the previous day with an elevated ozone layer merging with the urban boundary layer air in the afternoon.
Note: These preliminary data are noisy near the top of the curtain plot and exhibit a low bias around noon and in the early afternoon due to the solar background. The low (purple) O3 values near 1000 m AGL between 1100 and 1300 PDT, may also be biased low.
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