BOREAS TF-11 SSA Fen Soil Surface CO2 Flux Data

7.3 Data Characteristics

7.3.1 Parameter/Variable

The parameters contained in the data files are:

         Column Name
------------------------------
SITE_NAME
SUB_SITE
DATE_OBS
TIME
INSTRUMENT_NUM
CHAMBER_AREA
SYSTEM_VOLUME
PLATFORM
PLATFORM_REP
WATER_TABLE_HGT
CHAMBER_ID
DIST_H2O_TABLE
OBS_NUM
SOIL_TEMP_10CM
AIR_TEMP_CHAMBER
CO2_CONC
AIR_FLOW_CHAMBER
REL_HUM_CHAMBER
VAPOR_PRESS_CHAMBER
CO2_FLUX
CRTFCN_CODE
REVISION_DATE


7.3.2 Variable Description/Definition

The descriptions of the parameters contained in the data files are:

         Column Name                             Description
------------------------------ ------------------------------------------------
SITE_NAME                      The identifier assigned to the site by BOREAS,
                               in the format SSS-TTT-CCCCC, where SSS identifies
                               the portion of the study area: NSA, SSA, REG,
                               TRN, and TTT identifies the cover type for the 
                               site, 999 if unknown, and CCCCC is the identifier
                               for site, exactly what it means will vary with
                               site type.
SUB_SITE                       The identifier assigned to the sub-site by
                               BOREAS, in the format GGGGG-IIIII, where GGGGG is  
                               the group associated with the sub-site
                               instrument, e.g. HYD06 or STAFF, and IIIII is the 
                               identifier for sub-site, often this will refer to 
                               an instrument.
DATE_OBS                       The date on which the data were collected.
TIME                           The Greenwich Mean Time (GMT) when the data were
                               collected.
INSTRUMENT_NUM                 The instrument number used for the measurement.
                               If = 6400, the Li-Cor 6400 was used.
                               Otherwise, the Li-Cor 6200 was used and the 
                               number indicates the Li-Cor 6200 file number.
CHAMBER_AREA                   The total area covered by the respiration
                               chamber.
SYSTEM_VOLUME                  The total system volume of the equipment used to
                               measure flux.
PLATFORM                       The object (e.g., satellite, aircraft, tower,
                               person) that supported the instrument.
PLATFORM_REP                   The platform representation where 0 means that
                               the platform is representative of the
                               micrometeorological footprint and 1 means that
                               the platform is representative of the larger
                               strings in the fen.
WATER_TABLE_HGT                Water table height above a reference surface.
CHAMBER_ID                     Identifier assigned to the chamber measured.
DIST_H2O_TABLE                 The distance between the surface inside the
                               collar and the water table.
OBS_NUM                        The observation number.
SOIL_TEMP_10CM                 Soil temperature at a depth of 10 cm.
AIR_TEMP_CHAMBER               The temperature of the air in the chamber.
CO2_CONC                       CO2 concentration.
AIR_FLOW_CHAMBER               The total air flow rate through the system.
REL_HUM_CHAMBER                The relative humidity of the air in the chamber.
VAPOR_PRESS_CHAMBER            Vapor pressure of the air in the chamber.
CO2_FLUX                       Carbon Dioxide flux.
CRTFCN_CODE                    The BOREAS certification level of the data.
                               Examples are CPI (Checked by PI), CGR (Certified
                               by Group), PRE (Preliminary), and CPI-??? (CPI
                               but questionable).
REVISION_DATE                  The most recent date when the information in the
                               referenced data base table record was revised.


7.3.3 Unit of Measurement

The measurement units for the parameters contained in the data files are:

         Column Name                                Units
------------------------------ ------------------------------------------------
SITE_NAME                      [none]
SUB_SITE                       [none]
DATE_OBS                       [DD-MON-YYYY]
TIME                           [HHMMSS GMT]
INSTRUMENT_NUM                 [unitless]
CHAMBER_AREA                   [millimeters^2]
SYSTEM_VOLUME                  [millimeters^3]
PLATFORM                       [none]
PLATFORM_REP                   [none]
WATER_TABLE_HGT                [millimeters]
CHAMBER_ID                     [none]
DIST_H2O_TABLE                 [millimeters]
OBS_NUM                        [unitless]
SOIL_TEMP_10CM                 [degrees Celsius]
AIR_TEMP_CHAMBER               [degrees Celsius]
CO2_CONC                       [parts per million]
AIR_FLOW_CHAMBER               [micromoles][second ^-1]
REL_HUM_CHAMBER                [percent]
VAPOR_PRESS_CHAMBER            [millibars]
CO2_FLUX                       [micromoles][meter^-2][second^-1]
CRTFCN_CODE                    [none]
REVISION_DATE                  [DD-MON-YYYY]


7.3.4 Data Source

The source of the parameter values contained in the data files are:

         Column Name                             Data Source
------------------------------ ------------------------------------------------
SITE_NAME                      [Assigned by BORIS.]
SUB_SITE                       [Assigned by BORIS.]
DATE_OBS                       [Supplied by Investigator.]
TIME                           [Supplied by Investigator.]
INSTRUMENT_NUM                 [Supplied by Investigator.]
CHAMBER_AREA                   [Supplied by Investigator.]
SYSTEM_VOLUME                  [Supplied by Investigator.]
PLATFORM                       [Supplied by Investigator.]
PLATFORM_REP                   [Supplied by Investigator.]
WATER_TABLE_HGT                [Supplied by Investigator.]
CHAMBER_ID                     [Supplied by Investigator.]
DIST_H2O_TABLE                 [Supplied by Investigator.]
OBS_NUM                        [Supplied by Investigator.]
SOIL_TEMP_10CM                 [Supplied by Investigator.]
AIR_TEMP_CHAMBER               [Supplied by Investigator.]
CO2_CONC                       [Supplied by Investigator.]
AIR_FLOW_CHAMBER               [Supplied by Investigator.]
REL_HUM_CHAMBER                [Supplied by Investigator.]
VAPOR_PRESS_CHAMBER            [Supplied by Investigator.]
CO2_FLUX                       [Supplied by Investigator.]
CRTFCN_CODE                    [Assigned by BORIS.]
REVISION_DATE                  [Assigned by BORIS.]


7.3.5  Data Range

The following table gives information about the parameter values found in
the data files.

                     Minimum        Maximum        Missng  Unrel  Below   Data
                     Data           Data           Data    Data   Detect  Not
Column Name          Value          Value          Value   Value  Limit   Cllctd
--------------------------------------------------------------------------------
SITE_NAME            SSA-FEN-FLXTR  SSA-FEN-FLXTR  None    None   None    None 
SUB_SITE             9TF11-SSC01    9TF11-SSC01    None    None   None    None 
DATE_OBS             27-MAY-1994    03-OCT-1995    None    None   None    None 
TIME                 14200          234518         None    None   None    None 
INSTRUMENT_NUM       1              695            None    None   None    None 
CHAMBER_AREA         7100           8300           None    None   None    None 
SYSTEM_VOLUME        989900         1458000        -999    None   None    None 
PLATFORM             N1             S6             None    None   None    None 
PLATFORM_REP         0              1              None    None   None    None 
WATER_TABLE_HGT      35             287            -999    None   None    None 
CHAMBER_ID           0              9              None    None   None    None 
DIST_H2O_TABLE       0              330            -999    None   None    None 
OBS_NUM              1              3              None    None   None    None 
SOIL_TEMP_10CM       .838           22.63          -999    None   None    None 
AIR_TEMP_CHAMBER     5.703          33.03          None    None   None    Blank
CO2_CONC             331.7          524.4          None    None   None    None 
AIR_FLOW_CHAMBER     226.7          1228           None    None   None    None 
REL_HUM_CHAMBER      3.69           98.5           None    None   None    None 
VAPOR_PRESS_CHAMBER  1.608          24.91          None    None   None    None 
CO2_FLUX             -28.43         .2218          None    None   None    None 
CRTFCN_CODE          CPI            CPI            None    None   None    None 
REVISION_DATE        01-APR-1999    01-APR-1999    None    None   None    None 
--------------------------------------------------------------------------------
Minimum Data Value -- The minimum value found in the column.
Maximum Data Value -- The maximum value found in the column.
Missng Data Value  -- The value that indicates missing data. This is used to 
                      indicate that an attempt was made to determine the 
                      parameter value, but the attempt was unsuccessful.
Unrel Data Value   -- The value that indicates unreliable data.  This is used 
                      to indicate an attempt was made to determine the 
                      parameter value, but the value was deemed to be 
                      unreliable by the analysis personnel.
Below Detect Limit -- The value that indicates parameter values below the 
                      instruments detection limits.  This is used to 
                      indicate that an attempt was made to determine the 
                      parameter value, but the analysis personnel determined
                      that the parameter value was below the detection
                      limit of the instrumentation.
Data Not Cllctd    -- This value indicates that no attempt was made to 
                      determine the parameter value.  This usually 
                      indicates that BORIS combined several similar but 
                      not identical data sets into the same data base table
                      but this particular science team did not 
                      measure that parameter.

Blank -- Indicates that blank spaces are used to denote that type of value.
N/A   -- Indicates that the value is not applicable to the respective column.
None  -- Indicates that no values of that sort were found in the column.
--------------------------------------------------------------------------------


7.4 Sample Data Record

SITE_NAME,SUB_SITE,DATE_OBS,TIME,INSTRUMENT_NUM,CHAMBER_AREA,SYSTEM_VOLUME,
PLATFORM,PLATFORM_REP,WATER_TABLE_HGT,CHAMBER_ID,DIST_H2O_TABLE,OBS_NUM,
SOIL_TEMP_10CM,AIR_TEMP_CHAMBER,CO2_CONC,AIR_FLOW_CHAMBER,REL_HUM_CHAMBER,
VAPOR_PRESS_CHAMBER,CO2_FLUX,CRTFCN_CODE,REVISION_DATE
'SSA-FEN-FLXTR','9TF11-SSC01',27-MAY-1994,230757,4,8300,-999,'N1',1,-999.0,
'2',-999,1,-999.0,28.26,359.1,1014.0,21.33,8.189,-.5404,'CPI',01-APR-1999
'SSA-FEN-FLXTR','9TF11-SSC01',27-MAY-1994,231537,5,8300,-999,'N1',1,-999.0,
'2',-999,1,-999.0,28.07,358.8,1010.0,25.82,9.803,-.8599,'CPI',01-APR-1999
