FINAL NOX/O3 DATA
Malibu Halogen Experiment

University of CA, Irvine Group
Brandon Finley
Mike Lawler
Dr. Eric Saltzman

Contact:  Brandon Finley     Address:  1212 Croul Hall
	  bfinley@uci.edu              Univ. of CA, Irvine
	  (949) 824-5540               Irvine, CA, 92697
	  
INSTRUMENTATION:  

THERMO Environmental Instruments MODEL 42C Ozone Analyzer
THERMO Environmental Instruments MODEL 49C NOx Analyzer (NO & Total NOx)

Files:
1.  NOxdata.txt - contains the final NO and total NOx mixing ratios
	Column 1: Julian Day (format: day_of_year.time_of_day)
	Column 2: NO mixing ratio (ppb)
	Column 3: NOx mixing ratio (ppb)
	Column 4: NO2 mixing ratio (ppb)
2.  Ozonedata.txt - contains the final ozone mixing ratios
	Column 1: Julian Day (format: day_of_year.time_of_day)
	Column 2: Ozone mixing ratio (ppb)

INSTRUMENT ERRORS:
1.  NOx box: detection limit is 100 ppt, errors are estimated 
     to be +/- 5%
2.  O3 box: detection limit is 1 ppb, errors are estimated 
     to be +/- 1 ppb

IMPORTANT NOTES:
1.  ALL FILES ARE TAB DELIMITED
2.  All data are 1 reported at one minute intervals
3.  All reported data are 60 second averages
4.  Data from the first 2 hours of instrument operation have been
     removed from both the Noxdata.txt and Ozonedata.txt files.
     The deleted data correspond to instrument warm-up time and
     do not accurately reflect ambient NOx or O3 levels.
5.  In the NOxdata.txt file, column 2 (NO mixing ratio) contains
     negative values.  Rather than set these values to zero, I have
     left them in the data set so that there is a record of the raw
     instrument data.  Within the calibration and span error, these 
     values are not different from zero.
6.  In the Noxdata.txt file, column 3 (NO2 mixing ratio) is calculated
     by subtracting the NO mixing ratio from the NOx mixing ratio.  
     Where the NO value is negative, the NO2 mixing ratio is assumed
     equal to the NOx mixing ratio.