FREE AIR CO2 ENRICHMENT (FACE) DATA REPORT:
BULLS, NEW ZEALAND (http://cdiac.ornl.gov/programs/FACE/nzdata/nzdata.html)
YIELD DATA
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QUALITY-ASSURANCE CHECKS AND DATA-PROCESSING ACTIVITIES PERFORMED BY THE
BULLS, NEW ZEALAND, FACE PROJECT AND CDIAC
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All data were checked for appropriate format.

For each variable, the range of values was checked for unrealistically
large or small values.

The CUMDAY (days from enrichment) values were verified from the specified dates.


LIST OF FILES 
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Yield data are available for the period 1997-2002. The files are as follows:

File name          File description

drymatter.dat      1997-2002 adjusted dry matter data


DESCRIPTION and FORMAT OF THE ASCII DATA FILES
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Contents and format of the adjusted dry matter file, drymatter.dat:

Variable   Variable  Variable  Starting  Ending  Units      Definition and
           type      width     column    column             comments

CUMDAY     Integer          6         1       6  d          Cumulative day from start of experiment 

DATE       Character       12         7       18 -          Date (CCYY-MM-DD format)

RING       Integer          5        19       23 -          Experimental ring

BLK        Integer          5        24       28 -          Block, for statistical replication

MGMT       Character        4        29       32 -          Management scheme

CO2        Integer          6        33       38 ppm        Concentration of CO2

DM         Real             8        39       46 g/m2       Dry matter


For variable MGMT, G = grazed by sheep, C = grazing prevented by exclosure cage

The missing-value indicator in this file is -99.999 for the variable DM.


PARTIAL LISTINGS OF THE ASCII DATA FILES
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Partial listing of the ASCII adjusted dry matter file, drymatter.dat:

First two data records:

    30  1997-10-30    1    1   G   475 123.872
    30  1997-10-30    1    1   C   475  71.583

Last two data records:

  1722  2002-06-18    6    3   G   360 124.668
  1722  2002-06-18    6    3   C   360  37.797


SPREADSHEET SOFTWARE TO ACCESS THE DATA
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Since these hourly and daily weather files are space-delimited ASCII text, 
the files can be imported to spreadsheet software (e.g., Excel, Lotus, or Quattro-Pro) for 
processing.


SAS AND FORTRAN CODES TO ACCESS THE DATA
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The following is SAS code to read the adjusted dry matter file, drymatter.dat:

*SAS data retrieval routine to read drymatter.dat;
data drymatter;
infile 'drymatter.dat' firstobs=9;
input @1 CUMDAY 6. @7 DATE $char12. @19 RING 5. @24 BLK 5.
      @29 MGMT $CHAR4. @33 CO2 6. DM 8.3 ;
proc print;
run;


The following is Fortran code to read the adjusted dry matter file, drymatter.dat:

C *** Fortran program to read the FACE data file "drymatter.dat"
C
      INTEGER CUMDAY, RING, BLK, CO2 
      REAL DM
      CHARACTER DATE*10, MGMT*1 
C
      OPEN (UNIT=1, FILE='drymatter.dat')
C
      READ (1,100)
  100 FORMAT (///////)
   10 READ (1,101,END=99) CUMDAY, DATE, RING, BLK, MGMT,
     + CO2, DM
  101 FORMAT (2x,I4,2x,A10,4X,I1,4X,I1,3X,A1,3X,
     + I3,1x,F7.3)
C
      GO TO 10
   99 CLOSE (UNIT=1)
      STOP
      END