Thursday, August 11: SCOOP
Day 3 of SCOOP observations. TOPAZ data were taken from 12:19 to 19:39 PDT.
Clear skies. Maximum temperature of 25 C. Winds from the south/southwest at 1 to 12 m/s, with wind speeds decreasing throughout the day. Surface ozone* ranged from about 45 to 70 ppbv, with the maximum ozone concentrations occurring during the early morning hours. The PILOT fire was burning near Silverwood Lake, 40 km east of TMF. Smoke advected north into the Mojave Desert. TOPAZ observed several layers containing moderately high ozone concentrations (75 - 90 ppbv) at 2.5 and 5 - 7 km AGL, as well as low-ozone layers around 1.5, 3, and 4 km AGL at different times throughout the day. In addition, TOPAZ detected a very-low ozone layer (25-35 ppbv) around 8 km AGL.
AC noise and jitter on TOPAZ triggers caused the TROPOZ laser output power to drop. TOPAZ data from 12:19 to ~16:00 PDT were taken without synchronization with TROPOZ and JPL lidars. Optical isolator was put in TOPAZ trigger line. No more AC noise/jitter on TOPAZ triggers. Preliminary synchronization between all three lidars at about 16:00 PDT. Fine tuning of synching after 19:47 PDT.
*Note: The collocated in situ ozone concentrations are known to be about 6% low.
Note: Data are preliminary.