FAST-LVOS 2017 TOPAZ Data
June 8, 2017
Thursday, June 8
TOPAZ data were recorded from 9:57 - 22:45 PDT. Slightly cooler today with a max of 99 F at the NLVA(VGT) NWS station. There were thick high clouds and winds ahead of the advancing trough. Surface ozone remained above 60 ppbv from 0900 to 2100 PDT. Surface ozone concentrations at AP exceeded 70 ppbv for much of the day with different degrees of correlation with CO and other tracers. The surface winds were from the S to SSW at 10-15 m/s throughout this period (the CCDAQ wind profiler showed similar winds to at least 3 km agl). This implies that most of the ozone was advected into the LVV, but photochemical production and accumulation was also depressed in the SoCAB. TOPAZ once again showed a high (80-90 ppbv) ozone layer between 3 and 4 km agl with relatively high concentrations (65-75 ppbv) between this layer and the surface. The microDop showed the ML reached about 2500 m agl. Rapid periods of deep mixing around 1200 and 1900 PDT increased the surface concentrations by 5 to 10 ppbv. Similar increases were mirrored by the Apex CCDAQ monitor and several other CCDAQ monitors peaked during the evening episode. The MDA8 at most of the CCDAQ monitors reached at least 60 ppbv. As was the case yesterday, a combination of aged UT/LS air and other sources is suspected.
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