Title: Discoverer Ozone Measurements

Contact:

   James E. Johnson
   OCRD
   NOAA/Pacific Marine Environmental Laboratory
   7600 Sand Point Way NE
   Seattle, WA, USA, 98115
   Telephone: (206) 526-6355
   Facsimile: (206) 526-6744
   E-Mail Address: johnson@pmel.noaa.gov


Data Set Description:

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

This data set contains ozone measurements from two analyzers were
collected aboard the NOAA R/V Discoverer.

Data File contains the following parameters:

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 also the readme file for data set:
Discoverer Meteorological and Chemical Measurements [30-minute] from Johnson.

Format: comma-delimited ASCII file.

Date (YYYY/MM/DD) (UTC)
Time (HH:MM:SS) (UTC)
DOY (Julian decimal date) (UTC)
OZONE (ppb)
LATITUDE (degrees north)
LONGITUDE (degrees east)

File Name Conventions:
   o3.dat

References: None.