BOREAS TE-12 SSA Water Potential Data

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                                                                        
SPECIES                                                                         
CANOPY_LOCATION                                                                 
TREE_ID                                                                         
SAMPLE_ID                                                                       
NUM_OBS                                                                         
MEAN_WATER_POTENTIAL                                                            
SDEV_WATER_POTENTIAL                                                            
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) when the data were 
                               collected.                                      
DATE_COLLECTED                 The date on which the samples were collected.    
TIME_COLLECTED                 The Greenwich Mean Time (GMT) when the samples  
                               were collected.                                   
SPECIES                        Botanical (Latin) name of the species (Genus  
                               species).                                           
CANOPY_LOCATION                Location in the canopy from which the sample was 
                               taken.                                          
                                
The CANOPY_LOCATION parameter of the data set is a relative measure based upon 
the height of the sample location relative to the height of the canopy.  
Therefore, a sample collected from the top of a short tree in a tall canopy and 
a sample collected from the bottom of a short tree in a short canopy can both be 
designated as "low" for the HEIGHT parameter. Samples were collected from HIGH 
and LOW portions of the canopy at SSA-OBS and SSA-YJP. Samples were collected 
from LOW portions of the canopy at  SSA-FEN.  Canopy access at SSA-OBS was 
limited to the locations of the Terrestrial Ecology (TE) scaffolding towers.
                                                
TREE_ID                        Identifier of the mapped tree or plant stem.     
SAMPLE_ID                      The sample identifier used by data collectors (s 
                               ee documentation for a detailed description).    
NUM_OBS                        Number of observations of the given sample used  
                               to calculate given values.                       
MEAN_WATER_POTENTIAL           The mean water potential.                        
SDEV_WATER_POTENTIAL           The standard deviation of the water potential.   
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]                                       
SPECIES                        [none]                                           
CANOPY_LOCATION                [none]                                           
TREE_ID                        [none]                                           
SAMPLE_ID                      [none]                                           
NUM_OBS                        [counts]                                         
MEAN_WATER_POTENTIAL           [megaPascals]                                    
SDEV_WATER_POTENTIAL           [megaPascals]                                    
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                      [PLEASE COMPLETE]                                
SUB_SITE                       [PLEASE COMPLETE]                                
DATE_OBS                       [PLEASE COMPLETE]                                
TIME_OBS                       [PLEASE COMPLETE]                                
SPECIES                        [PLEASE COMPLETE]                                
CANOPY_LOCATION                [PLEASE COMPLETE]                                
TREE_ID                        [PLEASE COMPLETE]                                
SAMPLE_ID                      [PLEASE COMPLETE]                                
NUM_OBS                        [PLEASE COMPLETE]                                
MEAN_WATER_POTENTIAL           [PLEASE COMPLETE]                                
SDEV_WATER_POTENTIAL           [PLEASE COMPLETE]                                
CRTFCN_CODE                    [PLEASE COMPLETE]                                
REVISION_DATE                  [PLEASE COMPLETE]                                

                                                                                
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-9OA-FLXTR  SSA-YJP-FLXTR  None    None   None    None 
SUB_SITE             9TE12-WRP01    9TE12-WRP01    None    None   None    None 
DATE_OBS             04-AUG-1993    14-SEP-1994    None    None   None    None 
TIME_OBS             1343           2331           None    None   None    None 
SPECIES              N/A            N/A            None    None   None    None 
CANOPY_LOCATION      High           Middle         None    None   None    None 
TREE_ID              1              73             None    None   None    None 
SAMPLE_ID            940001         99999          None    None   None    None 
NUM_OBS              1              9              None    None   None    None 
MEAN_WATER_POTENTIAL -2.51          -.07           None    None   None    None 
SDEV_WATER_POTENTIAL -.6            0              -999    None   None    None 
CRTFCN_CODE          CPI            CPI            None    None   None    None 
REVISION_DATE        28-AUG-1997    28-AUG-1997    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,SPECIES,CANOPY_LOCATION,TREE_ID,SAMPLE_ID,
NUM_OBS,MEAN_WATER_POTENTIAL,SDEV_WATER_POTENTIAL,CRTFCN_CODE,REVISION_DATE
'SSA-9OA-FLXTR','9TE12-WRP01',06-JUN-1994,1728,'Populus tremuloides','High',4,
'940115',8,-1.46,-.25,'CPI',28-AUG-1997
'SSA-9OA-FLXTR','9TE12-WRP01',06-JUN-1994,1807,'Populus tremuloides','High',5,
'940118',8,-1.68,-.38,'CPI',28-AUG-1997
