BOREAS TF-01 SSA-OA Weekly Tower CH4 and N2O Flux

7.3 Data Characteristics

7.3.1 Parameter/Variable

The parameters contained in the data files are:

         Column Name
------------------------------
SITE_NAME
SUB_SITE
START_DATE
END_DATE
MEAN_WEEKLY_CH4_FLUX
STD_ERR_WEEKLY_CH4_FLUX
NUM_WEEKLY_CH4_FLUX
MEAN_WEEKLY_N2O_FLUX
STD_ERR_WEEKLY_N2O_FLUX
NUM_WEEKLY_N2O_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.
START_DATE                     The date on which the collection of data 
                               commenced.
END_DATE                       The date on which the collection of the data was
                               terminated.
MEAN_WEEKLY_CH4_FLUX           The weekly averaged methane flux, based on half
                               hour methane fluxes.
STD_ERR_WEEKLY_CH4_FLUX        The standard error of the weekly averaged methane
                               flux, based on half hour methane fluxes.
NUM_WEEKLY_CH4_FLUX            The number of half hour flux values used in 
                               calculating the weekly averaged methane flux.
MEAN_WEEKLY_N2O_FLUX           The weekly averaged nitrous oxide flux, based on
                               half hour nitrous oxide fluxes.
STD_ERR_WEEKLY_N2O_FLUX        The standard error of the weekly averaged nitrous
                               oxide flux, based on half hour nitrous oxide 
                               fluxes.
NUM_WEEKLY_N2O_FLUX            The number of half hour flux values used in 
                               calculating the weekly averaged nitrous oxide 
                               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]
START_DATE                     [DD-MON-YY]
END_DATE                       [DD-MON-YY]
MEAN_WEEKLY_CH4_FLUX           [nanomoles][meters^-2][second^-1]
STD_ERR_WEEKLY_CH4_FLUX        [nanomoles][meters^-2][second^-1]
NUM_WEEKLY_CH4_FLUX            [counts]
MEAN_WEEKLY_N2O_FLUX           [nanomoles][meters^-2][second^-1]
STD_ERR_WEEKLY_N2O_FLUX        [nanomoles][meters^-2][second^-1]
NUM_WEEKLY_N2O_FLUX            [counts]
CRTFCN_CODE                    [none]
REVISION_DATE                  [DD-MON-YY]

7.3.4 Data Source

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

         Column Name                             Data Source
------------------------------ ------------------------------------------------
SITE_NAME                      [Assigned by BORIS.]
SUB_SITE                       [Assigned by BORIS.]
START_DATE                     [Supplied by Investigator.]
END_DATE                       [Supplied by Investigator.]
MEAN_WEEKLY_CH4_FLUX           [TGAS and sonic anemometer]
STD_ERR_WEEKLY_CH4_FLUX        [TGAS and sonic anemometer]
NUM_WEEKLY_CH4_FLUX            [Supplied by Investigator.]
MEAN_WEEKLY_N2O_FLUX           [TGAS and sonic anemometer]
STD_ERR_WEEKLY_N2O_FLUX        [TGAS and sonic anemometer]
NUM_WEEKLY_N2O_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-9OA-FLXTR  SSA-9OA-FLXTR  None    None   None    None
SUB_SITE             9TF01-FLX01    9TF01-FLX01    None    None   None    None
START_DATE           17-APR-94      11-SEP-94      None    None   None    None
END_DATE             23-APR-94      17-SEP-94      None    None   None    None
MEAN_WEEKLY_CH4_FLUX -.22375        5.33           None    None   None    None
STD_ERR_WEEKLY_CH4_  .30813         2.09           None    None   None    None
FLUX
NUM_WEEKLY_CH4_FLUX  35             115            None    None   None    None
MEAN_WEEKLY_N2O_FLUX -.1225         .16341         None    None   None    None
STD_ERR_WEEKLY_N2O_  .04023         .11909         None    None   None    None
FLUX
NUM_WEEKLY_N2O_FLUX  35             120            None    None   None    None
CRTFCN_CODE          CPI            CPI            None    None   None    None
REVISION_DATE        24-MAY-99      24-MAY-99      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,START_DATE,END_DATE,MEAN_WEEKLY_CH4_FLUX,
STD_ERR_WEEKLY_CH4_FLUX,NUM_WEEKLY_CH4_FLUX,MEAN_WEEKLY_N2O_FLUX,
STD_ERR_WEEKLY_N2O_FLUX,NUM_WEEKLY_N2O_FLUX,CRTFCN_CODE,REVISION_DATE
'SSA-9OA-FLXTR','9TF01-FLX01',17-APR-1994,23-APR-1994,-.13125,.93125,50,
-.1225,.11909,50,'CPI',24-MAY-1999
'SSA-9OA-FLXTR','9TF01-FLX01',24-APR-1994,30-APR-1994,.6325,.78688,72,
-.05932,.10727,67,'CPI',24-MAY-1999
