Las Vegas Ozone Study TOPAZ Data
May 20, 2013
May 20. Monday. Clear and calm. Lidar data was collected from 0926 to 1936 PDT. The preliminary TOPAZ curtain plot shows an elevated (~120 ppbv) ozone layer between 1.0 and 2.0 AGL in the morning, which slopes upward and becomes thinner near midday with a descending low ozone layer underneath. The high ozone layer slopes downward again in the afternoon. The FLEXPART and WRF-Chem models show this intrusion reaching the boundary layer well to the SW of Las Vegas. The in situ O3/CO concentrations remained near 60/130 ppbv all day.
Note: the low (purple) ozone values seen near the top of the curtain plot near midday are biased by the solar background in these preliminary analyses.
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