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August 30, 2013

The surface coating of one 289nm Raman cell window is found to be damaged so that the 289 laser power is not strong, but OK for measurement after realigning. Wet and high aerosol sky condition. The lidar ozone retrievals in the PBL are about 5 ppb higher than the sonde, very likely due to aerosol interference. A large enhanced layer at 5-8 km. Similar high ozone in mid and upper troposphere in the recent three days' profiles. Note the date of HU818 is 30 August.