BOREAS TF-11 SSA Fen Leaf Gas Exchange 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_OBS
INSTRUMENT_NUM
GENUS
LEAF_ID
LEAF_AREA
STUDY_TYPE
OBS_NUM
ELAPSED_TIME_INIT
DOWN_PPFD_CHAMBER
LEAF_TEMP
AIR_TEMP_CHAMBER
CO2_CONC_CHAMBER
AIR_FLOW_CHAMBER
REL_HUM_CHAMBER
VAPOR_PRESS_CHAMBER
CO2_ASSIMILATION
STOMATAL_MOLAR_CONDUCT_H2O
INTERCELL_CO2_CONC
BOUND_LAYER_MOLAR_CONDUCT_H2O
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_OBS                       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.
GENUS                          The genus of the plant sample, where Betula=Bet
                               Betula pumila, Menyanthes=Menyanthes trifoliata,
                               and Carex=Carex sp. (primarily Carex diandra).
LEAF_ID                        The unique leaf identifier, within a day.
LEAF_AREA                      The area of the leaf (or needles) enclosed in
                               the chamber, this value is always half the 
                               total surface area of the sample.
STUDY_TYPE                     An indicator of the type of study being
                               conducted. Pn=net photosynthesis, Lr=light 
                               response curve, Rd=dark respiration, Aci=net CO2
                               assimilation versus internal CO2 concentration 
                               curve, Vr=vapor pressure deficit response. Note: 
                               these are not mutually exclusive designations.
OBS_NUM                        The observation number.
ELAPSED_TIME_INIT              The elapsed time since the initiation of the
                               measurement indicated by the observation time.
DOWN_PPFD_CHAMBER              The incoming photosynthetic photon flux density
                               measured in the chamber.
LEAF_TEMP                      The leaf or shoot temperature
AIR_TEMP_CHAMBER               The temperature of the air in the chamber.
CO2_CONC_CHAMBER               The CO2 concentration of the air in the chamber.
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_ASSIMILATION               CO2 assimilation on leaf area basis
STOMATAL_MOLAR_CONDUCT_H2O     Stomatal conductance of water vapor.
INTERCELL_CO2_CONC             Intercellular CO2 concentration.
BOUND_LAYER_MOLAR_CONDUCT_H2O  The boundary layer conductance for water vapor      
                               of the sample.
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_OBS                       [HHMM GMT]
INSTRUMENT_NUM                 [unitless]
GENUS                          [none]
LEAF_ID                        [unitless]
LEAF_AREA                      [millimeter^2]
STUDY_TYPE                     [none]
OBS_NUM                        [unitless]
ELAPSED_TIME_INIT              [seconds]
DOWN_PPFD_CHAMBER              [micromoles][meters^-2][second^-1]
LEAF_TEMP                      [degrees Celsius]
AIR_TEMP_CHAMBER               [degrees Celsius]
CO2_CONC_CHAMBER               [parts per million]
AIR_FLOW_CHAMBER               [micromoles][second ^-1]
REL_HUM_CHAMBER                [percent]
VAPOR_PRESS_CHAMBER            [millibars]
CO2_ASSIMILATION               [micromoles CO2][meter^-2][second^-1]
STOMATAL_MOLAR_CONDUCT_H2O     [millimoles H2O][meter^-2][second^-1]
INTERCELL_CO2_CONC             [parts per million]
BOUND_LAYER_MOLAR_CONDUCT_H2O  [moles H2O][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_OBS                       [Supplied by Investigator.]
INSTRUMENT_NUM                 [Supplied by Investigator.]
GENUS                          [Supplied by Investigator.]
LEAF_ID                        [Supplied by Investigator.]
LEAF_AREA                      [Supplied by Investigator.]
STUDY_TYPE                     [Supplied by Investigator.]
OBS_NUM                        [Supplied by Investigator.]
ELAPSED_TIME_INIT              [Supplied by Investigator.]
DOWN_PPFD_CHAMBER              [Supplied by Investigator.]
LEAF_TEMP                      [Supplied by Investigator.]
AIR_TEMP_CHAMBER               [Supplied by Investigator.]
CO2_CONC_CHAMBER               [Supplied by Investigator.]
AIR_FLOW_CHAMBER               [Supplied by Investigator.]
REL_HUM_CHAMBER                [Supplied by Investigator.]
VAPOR_PRESS_CHAMBER            [Supplied by Investigator.]
CO2_ASSIMILATION               [Supplied by Investigator.]
STOMATAL_MOLAR_CONDUCT_H2O     [Supplied by Investigator.]
INTERCELL_CO2_CONC             [Supplied by Investigator.]
BOUND_LAYER_MOLAR_CONDUCT_H2O  [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-LFC01    9TF11-LFC01    None    None   None    None
DATE_OBS             08-JUN-1994    06-AUG-1995    None    None   None    None
TIME_OBS             2              2355           None    None   None    None
INSTRUMENT_NUM       29             6400           None    None   None    None
GENUS                N/A            N/A            None    None   None    None
LEAF_ID              1              24             None    None   None    None
LEAF_AREA            225            2540           None    None   None    None
STUDY_TYPE           ACi            Vr             None    None   None    None
OBS_NUM              1              635            None    None   None    None
ELAPSED_TIME_INIT    -1.516         9259           None    None   None    None
DOWN_PPFD_CHAMBER    -2.274         9658           -999    None   None    None
LEAF_TEMP            8.24           45.97          None    None   None    None
AIR_TEMP_CHAMBER     9.844          37.27          -999    None   None    None
CO2_CONC_CHAMBER     2.73           605.2          None    None   None    None
AIR_FLOW_CHAMBER     -9.65          1123           None    None   None    None
REL_HUM_CHAMBER      -2.75          99.85          -999    None   None    None
VAPOR_PRESS_CHAMBER  -2.098         46.85          -999    None   None    None
CO2_ASSIMILATION     -5.724         40.76          -999    None   None    None
STOMATAL_MOLAR_      -4502          7537           -999    None   None    None
CONDUCT_H2O
INTERCELL_CO2_CONC   -3164          18330          -999    None   None    None
BOUND_LAYER_MOLAR_   .9             2.87           None    None   None    None
CONDUCT_H2O
CRTFCN_CODE          CPI            CPI            None    None   None    None
REVISION_DATE        14-APR-1999    14-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_OBS,INSTRUMENT_NUM,GENUS,LEAF_ID,LEAF_AREA,
STUDY_TYPE,OBS_NUM,ELAPSED_TIME_INIT,DOWN_PPFD_CHAMBER,LEAF_TEMP,
AIR_TEMP_CHAMBER,CO2_CONC_CHAMBER,AIR_FLOW_CHAMBER,REL_HUM_CHAMBER,
VAPOR_PRESS_CHAMBER,CO2_ASSIMILATION,STOMATAL_MOLAR_CONDUCT_H2O,
INTERCELL_CO2_CONC,BOUND_LAYER_MOLAR_CONDUCT_H2O,CRTFCN_CODE,REVISION_DATE
'SSA-FEN-FLXTR','9TF11-LFC01',08-JUN-1994,1722,78,'Betula',1,416.0,'Pn',
1,7.271,1695.0,30.61,30.27,329.3,174.3,24.33,10.48,8.655,156.7,217.2,1.37,
'CPI',14-APR-1999
'SSA-FEN-FLXTR','9TF11-LFC01',08-JUN-1994,1741,79,'Betula',2,290.0,'Pn',
1,7.357,2153.0,32.67,31.49,347.0,179.2,24.33,11.24,13.55,213.0,214.0,1.37,
'CPI',14-APR-1999
