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     ATMOSPHERIC TRACE GAS MIXING/ISOTOPE RATIOS
     derived from samples collected using the
     NOAA CMDL Portable Flask Packages (PFP)

     Measurements made at:	
     1. NOAA Earth System Research Laboratory (CMDL): Dec. 2000 - Aug. 2003
     2. Instituto de Pesquisas Energeticas e Nucleares (IPEN), Sao Paulo:  April, 2004 - present

     Contributed by:
     John B. Miller
     Pieter P. Tans
     NOAA/ESRL
     325 Broadway
     Boulder, CO  80305
     john.b.miller@noaa.gov

     Luciana V. Gatti
     lvgatt@ipen.br

*********************************NOTICE************************************

When using the PFP merged data in a publication or presentation, please
acknowledge the National Oceanic and Atmospheric Administration (NOAA),
Earth System Research Laboratory (ESRL), Carbon Cycle Greenhouse
Gases Group and IPEN.

The principal investigators would appreciate receiving manuscripts
that use the data to ensure that the quality and limitations
of the data are accurately represented.  Feedback from users may
also help us to improve the quality of the data and the locations of the
sampling sites.  Comments regarding the README files and the data files
are encouraged.  Please send comments to the e-mail address given above.

************************************WARNING********************************

NOAA ESRL has attempted to provide the most precise measurements possible.
We reserve the right to make adjustments to the data when made necessary
by adjustments to calibration scales.

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Aircraft merged files contain one line for each 
Portable Flask Package (PFP) sample. 

Lines may read using the following FORTRAN format statement:

A3,1X,A16,1X,A8,1X,A1,3(1X,F8.2),1X,2(F7.1,1X),F6.1,1X,I8,8(1X,F9.3,1X,A3)


The fields in a single line are defined as follows:

sta yyyy mm dd hh mm xxxxx-xx c ddd.dd dddd.dd ddddd.dd dddd.d dddd.d dddd.d 
xxxxxx dddd.ddd fff dddd.ddd fff dddd.ddd fff dddd.ddd fff dddd.ddd fff dddd.ddd fff
dddd.ddd fff dddd.ddd fff 

where:

     sta =              the three-letter station code.

     yyyy mm dd =       the UTC year, month, and day (four digit year,
                        two digit month and day) when the sample was collected

     hh mm =            the UTC time (hour, minutes; two digits
                        each) of sample collection

     xxxxx-xx =         the flask sample I.D. number.  This
                        field can contain up to eight       
                        characters but may contain fewer.   
                        This field may contain letters as well 
                        as numbers.

     c =                a one letter code that identifies the sample
                        collection method.

     ddd.dd =           Latitude during collection in decimal degrees

     dddd.dd =          Longitude during collection in decimal degrees

     dddd.dd =          Altitude during collection in meters above sea level

     dddd.d =           air temperature in degree C (default = -40.0)

     dddd.d =           air pressure in millibars   (default = -99.0)

     dddd.d =           percent relative humidity   (default = 11.3)

     xxxxxxxx =           internal CMDL event number; unique for each sampling event

     ddddd.ddd fff =     CO2 mixing ratio in ppm.  Missing values
                        are denoted by -999.99.  "fff" is a 
                        three-character flag indicating the results
                        of our data selection process.

                             An alphanumeric other than a period (.) in the FIRST
                             column indicates samples with obvious problems during 
                             sample collection or analysis.

                             An alphanumeric other than a period (.) in the SECOND 
                             column indicates samples which are believed to be 
                             non-background.

                             An alphanumeric other than a period (.) in the THIRD
                             column is a sample qualifier that is not presently used.

     ddddd.ddd fff =     CH4 mixing ratio in ppb and flag.  Missing 
                        values are denoted by -999.99.

     ddddd.ddd fff =     CO mixing ratio in ppb and flag.  Missing 
                        values are denoted by -999.99.

     ddddd.ddd fff =     H2 mixing ratio in ppb and flag.  Missing
                        values are denoted by -999.99.

     ddddd.ddd fff =     N2O mixing ratio in ppb and flag.  Missing
                        values are denoted by -999.99.

     ddddd.ddd fff =     SF6 mixing ratio in ppt and flag.  Missing
                        values are denoted by -999.99.

     dddd.ddd fff =     d13C (CO2) isotope ratio in per mil and flag.
                        Missing values are denoted by -999.999.

     dddd.ddd fff =     d18O (CO2) isotope ratio in per mil and flag.
                        Missing values are denoted by -999.999.
			!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
			!!!!NOTE!!: NO D18O CO2 DATA ARE RELIABLE FROM OUR BRAZILIAN!!!!!!
			!!!!SITES DUE TO HUMIDITY CONTAMINATION.!!!!!!!!!!!!!!!!!!!!!!!!!!
			!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

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