Las Vegas Ozone Study TOPAZ Data
May 19, 2013
May 19. Sunday. Clear all day with light breeze. First LVOS TOPAZ operations in the early afternoon with Lidar data collected from 1337 to 2027 PDT (=MST) or 2030 to 0330 UT. In situ O3/CO instruments installed, with measurements recorded continuously from 1930 PDT (0230 UT) onward. The preliminary TOPAZ curtain plot shows a layer of high ozone (>100 ppbv) between 1.5 and 2.0 km AGL (3.2 to 4.7 km ASL). This layer is consistent with a stratospheric intrusion seen in the FLEXPART and WRF-Chem forecasts. The in situ O3/CO concentrations were 67/135 ppbv at 0230UT.
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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