TRACEGAS DATABASE FORMAT


During the years 1974 to 1976, the P-system sphere samples were analyzed 
at EML.  Subsequently, WSU (1976-1979) and OGC (1980-1983) were under 
contract to EML to analyze gas samples.  During the period (1974-1983), 
980 gas samples were analyzed for one or more of the following gases CCl3F, 
CCl2F2, CCl4, CH3CCl3, SF6, N20, CO2, CH4, and COS.  The data have been 
organized by compounds into 9 files (gasname.tex).  Included in each table 
are the following:

EML NUM:  Every P-system sphere was given a number starting with a "G".  The 
          CLASS samples were given a 5-digit number.  The first or units 
          digit represented the bottle number.  The 2 and 3rd digits (tens 
          and hundreds digits) represented the package number and the last 
          two digits (thousands and ten thousands) represented the AIRSTREAM 
          flight number.  Thus 29048 represents the 8th bottle of the 4th 
          package on AIRSTREAM mission 29.

FLIGHT Date:  This is the gas sample collection date.

ALT (km):  This is the gas sample collection altitude.

TROP (km):  This is the tropopause height.

NORMAL ALT: This is a derived altitude obtained by subtracting the 
            tropopause altitude from the sampling altitude.  A negative number 
            represents a sample collected in the troposphere, while a positive 
            number refers to a stratospheric sample.

BEGIN LAT:  This is the latitude in which the sample bottle was started to 
            be filled.

END LAT:  This is the latitude in which the filling of the sample bottle ended.

BEGIN LONG:  This is the longitude in which the sample bottle was started to 
             be filled.

END LONG:  This is the longitude in which the filling of the sample bottle 
           ended.

LAB:  This is the analytical laboratory performing the chemical analysis on the 
      HASP samples.  

      HASL = Health and Safety Laboratory of the Atomic Energy Commission, now 
             the Environmental Measurements Laboratory (EML), 
      WSU  = Washington State University,
      OGC  = Oregon Graduate Center, now the Oregon Graduate Institute for Science
             and Technology.

CONC:  The concentration reported is the average of at least duplicate analyses.

ERROR:  The error represents the 1 sigma deviation from the mean.