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