FAST-LVOS 2017 TOPAZ Data

June 11, 2017

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Daily Summary:

Sunday, June 11
TOPAZ data were recorded from 7:56 PDT through the night until 7:32 PDT on June 12 (data collection was continued the next day without interruption). Cooldown prior to the arrival of the deep trough continued with a max temperature around 30 C. Clear throughout the day. Strong S to SW winds from 15 to 25 m/s with higher gusts swept away any locally produced O3. Several layers of high ozone aloft were observed, including a tongue of very high ozone (peak values around 280 ppbv near 5.5 km AGL) associated with a strong stratospheric intrusion as the trough axis passed over Las Vegas in the early morning hours on June 12. The high ozone did not get transported down to the surface, except in the afternoon on June 11 when entrainment by the mixed layer pushed surface ozone up to about 70 ppbv.