DIAL Daily Activity Log Telescope
Type: Ch5 Ch2 Ch1
Date: 6/26/2009   Time Zone: GMT-5 Primary Diameter 16'' 4'' 4''
Operator: Kuang   F/# 4.5 1 1
Sky condition clear         Field Stop 1.5 mrads 4.3mrads 4.3mrads
1st data after 291 controller was burned Electronics
Laser power     before data acquisition
  HV (kV) Green(W) UV(mW) BBO Crystal   PMT EMI8931QA R7400U-03 R7400U-03
285 Laser:  1.55 74 288.895   Voltage 1850V 800V 800V
291 Laser 1.5   52 297.001   Serial # 49
Alignment no no
Disc Level 8 8 8
ADC Range (mV) 100 500 500
Filter solar solar solar
Data Description                    
  Delay (us)* ND Filter
Time resolution(min) Ch1 Ch2-285 Ch2-291 Ch5 Ch1 Ch2 Ch5
18:50 2 0 192, 2 203, 2# 4, 15 NA NA NA
Purpose taking data
Comments The strength of the signal varied for 6/20/09 data because the pulse generator controlling 291 failed. This does not only influence 291, but also influence 285.    
*The first value is the delay set on the pulse generator; the second one is the actual delay. 
#We set this delay using the time difference between the YAG trigger and outgoing UV laser trigger. 


Range-corrected signal

Ozone retrieval (10-min resolution)

This lidar data suggests a high ozone (~70-80 ppbv) accompanied with heavy aerosol extinction (comfirmed by ceilometer data) in the boundary layer and a low ozone layer at ~5km. This distribution pattern agrees well with the ozonesonde measurement made at 13:01 LT on the next day. The ozone and aerosol concentrations decrease slightly with time. The AQI surface data from EPA also indicate today is a seriously polluted day for ozone.

Ozonesonde measurement on Jun. 27, 09 (one day after this lidar measurement)

Aerosol extinction retrieval at 291nm

Heavy aerosol

Ceilometer backscatter (note: in UTC)

8-hr Air Quality Index (source: http://www.airnow.gov)