BOREAS RSS-17 Xylem Flux Density Measurements at the SSA-OBS Site

7.3 Data Characteristics

7.3.1 Parameter/Variable

The parameters contained in the data files on the CD-ROM are:

         Column Name
------------------------------
SITE_NAME
SUB_SITE
DATE_OBS
TIME_OBS
MEAN_XYLEM_FLUX_DENSITY_T1
MEAN_XYLEM_FLUX_DENSITY_T2
MEAN_XYLEM_FLUX_DENSITY_T3
MEAN_XYLEM_FLUX_DENSITY_T4
MEAN_XYLEM_FLUX_DENSITY_T5
CRTFCN_CODE
REVISION_DATE

7.3.2 Variable Description/Definition

The descriptions of the parameters contained in the data files on
the CD-ROM 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) at the end of the
                               period when the data were collected.
MEAN_XYLEM_FLUX_DENSITY_T1     The mean xylem sap flux density aggregated from
                               one minute measurements made at the SSA-OBS site
                               at tree 1, which has a dbh of 138 mm, a height of
                               10 m, and a projected canopy area of 2.12 m^2.
MEAN_XYLEM_FLUX_DENSITY_T2     The mean xylem sap flux density aggregated from
                               one minute measurements made at the SSA-OBS site 
                               at tree 2, which has a dbh of 90 mm, a height of 
                               6.5 m, and a projected canopy area of 2.0 m^2.
MEAN_XYLEM_FLUX_DENSITY_T3     The mean xylem sap flux density aggregated from
                               one minute measurements made at the SSA-OBS site 
                               at tree 3, which has a dbh of 99 mm, a height of 
                               8.2 m, and a projected canopy area of 1.22 m^2.
MEAN_XYLEM_FLUX_DENSITY_T4     The mean xylem sap flux density aggregated from
                               one minute measurements made at the SSA-OBS site 
                               at tree 4, which has a dbh of 45 mm, a height of 
                               6.9 m, and a projected canopy area of 0.57 m^2.
MEAN_XYLEM_FLUX_DENSITY_T5     The mean xylem sap flux density aggregated from
                               one minute measurements made at the SSA-OBS site 
                               at tree 5, which has a dbh of 180 mm, a height of
                               12.7 m, and a projected canopy area of 5.30 m^2.
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 on
the CD-ROM are:

         Column Name                                Units
------------------------------ ------------------------------------------------
SITE_NAME                      [none]
SUB_SITE                       [none]
DATE_OBS                       [DD-MON-YYYY]
TIME_OBS                       [HHMM GMT]
MEAN_XYLEM_FLUX_DENSITY_T1     [grams][meter^-2][second^-1]
MEAN_XYLEM_FLUX_DENSITY_T2     [grams][meter^-2][second^-1]
MEAN_XYLEM_FLUX_DENSITY_T3     [grams][meter^-2][second^-1]
MEAN_XYLEM_FLUX_DENSITY_T4     [grams][meter^-2][second^-1]
MEAN_XYLEM_FLUX_DENSITY_T5     [grams][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 on
the CD-ROM are:

         Column Name                             Data Source
------------------------------ ------------------------------------------------
SITE_NAME                      [Assigned by BORIS Staff]
SUB_SITE                       [Assigned by BORIS Staff]
DATE_OBS                       [Datalogger]
TIME_OBS                       [Datalogger]
MEAN_XYLEM_FLUX_DENSITY_T1     [Measurement probe/Datalogger]
MEAN_XYLEM_FLUX_DENSITY_T2     [Measurement probe/Datalogger]
MEAN_XYLEM_FLUX_DENSITY_T3     [Measurement probe/Datalogger]
MEAN_XYLEM_FLUX_DENSITY_T4     [Measurement probe/Datalogger]
MEAN_XYLEM_FLUX_DENSITY_T5     [Measurement probe/Datalogger]
CRTFCN_CODE                    [Assigned by BORIS Staff]
REVISION_DATE                  [Assigned by BORIS Staff]

7.3.5  Data Range

The following table gives information about the parameter values found in
the data files on the CD-ROM.

                     Minimum        Maximum        Missng  Unrel  Below   Data
                     Data           Data           Data    Data   Detect  Not
Column Name          Value          Value          Value   Value  Limit   Cllctd
--------------------------------------------------------------------------------
SITE_NAME            SSA-OBS-FLXTR  SSA-OBS-FLXTR  None    None   None    None

SUB_SITE             RSS01-XYL01    RSS01-XYL01    None    None   None    None

DATE_OBS             31-MAY-1994    28-SEP-1994    None    None   None    None

TIME_OBS             0000           2350           None    None   None    None

MEAN_XYLEM_FLUX_     .001           17.737         None    None   None    None
DENSITY_T1

MEAN_XYLEM_FLUX_     .001           19.602         None    None   None    None
DENSITY_T2

MEAN_XYLEM_FLUX_     .001           30.61          None    None   None    None
DENSITY_T3

MEAN_XYLEM_FLUX_     .001           15.176         None    None   None    None
DENSITY_T4

MEAN_XYLEM_FLUX_     .001           12.407         None    None   None    None
DENSITY_T5

CRTFCN_CODE          CPI            CPI            None    None   None    None

REVISION_DATE        17-JUL-1998    17-JUL-1998    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,MEAN_XYLEM_FLUX_DENSITY_T1,
MEAN_XYLEM_FLUX_DENSITY_T2,MEAN_XYLEM_FLUX_DENSITY_T3,
MEAN_XYLEM_FLUX_DENSITY_T4,MEAN_XYLEM_FLUX_DENSITY_T5,CRTFCN_CODE,
REVISION_DATE
'SSA-OBS-FLXTR','RSS17-XYL01',31-MAY-1994,600,1.893,.875,1.125,3.034,1.405,
'CPI',17-JUL-1998
'SSA-OBS-FLXTR','RSS17-XYL01',31-MAY-1994,630,1.828,.771,.906,2.956,1.177,
'CPI',17-JUL-1998
