Reduced and Compiled by NOAA-PMEL
NOAA Ship Discoverer
Surface ozone data
Version 1, 30 August 1996
Jim Johnson

Data File ace1_o3.csv contains the following parameters:

DOY
OZONE (in ppb)
LATITUDE (degrees north)
LONGITUDE (degrees east)

DOY
The data are compiled into 30 minute averages. The time is given as 
decimal 
day of year (DOY) such that DOY 32.5 is 12 noon GMT on February 1.  The 
time given is from the center of the 30 minute period.

OZONE
Two ozone uv analyzers were used, a Dasibi 1008 AH ,and a TECO 49.  Both 
analyzers were calibrated to a NIST traceable analyzer at the NOAA-CMDL 
lab prior to the project.  One minute averages of the output of each 
analyzer were recorded on the PMEL data system and plots were made of 
the raw data.  A small portion of the data was deleted (consisting 
mostly of times that the inlet air was passed through a zero filter - 
usually when the relative wind was well behind the beam of the ship).

After the raw data was cleaned, the calibration function from CMDL 
(offset and slope) was applied, and 30-minute averages were created.  
The 30-minute average from each instrument was then averaged together to 
create the final data in the ace1_o3.csv file.

30-minute intervals that had no clean ozone data are tagged with a value 
-99.

LAT. and LONGT. 
See the readme file with the 95atm30.csv file.