Data Set "FLX01_FLUX_MET_TEMP" ------------------------------ Revised: March 8, 2001 BOREAS Follow-on FLX-1 NSA-OBS Tower Flux, Met, and Soil Temp Data The BOREAS Follow-on FLX-1 team have been collecting tower flux, surface meterological, and soil temperature data at the BOREAS NSA-OBS site continuously since March 1994. Data from March 1994 through October 1996 are included in the BOREAS TF-3 effort while data from the end of October 1996 through December 1998 are included in the BOREAS Follow-on FLX-1 effort. These measurements are ongoing and updates are made on the groupsÕ FTP server ftp://ftp.as.harvard.edu/pub/nigec/Boreas_OBS/ and can be directly downloaded. The BOREAS follow-on data are available in tabular ASCII files. Acknowledge: Steven Wofsy, Allison Dunn Column Name Units Column Description ----------- ----- ------------------ SITE_NAME [none] 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. DATE_OBS [DD-MON-YY] The date on which the data were collected. TIME_OBS [HHMM GMT] The Greenwich Mean Time (GMT) representing the midpoint of the half-hour period when the data were collected. SENSIBLE_HEAT [Watts] The sensible heat flux measured above the _FLUX_ABV_CNPY [meter^-2] canopy. LATENT_HEAT_FLUX [Watts] The latent heat flux measured above the _ABV_CNPY [meter^-2] canopy. NET_RAD_ABV_CNPY [Watts] The net radiation measured above the canopy. [meter^-2] CO2_FLUX_ABV_CNPY [micromoles] The carbon dioxide flux measured above the [meter^-2] canopy [second^-1] CO2_CONC_ABV_CNPY [parts per The carbon dioxide concentration measured million] above the canopy. CO2_STORAGE [micromoles] The storage term of carbon dioxide below [meter^-2] 30m. [second^-1] PPFD_ABV_CNPY [micromoles] The incident photosynthetic photon flux [meter^-2] density measured above the canopy. [second^-1] PPFD_BELOW_CNPY [micromoles] The median value from 8 ground-level incident [meter^-2] photosynthetic photon flux density measurements [second^-1] under the canopy. WIND_DIR_ABV_CNPY [degrees from The wind direction measured above the canopy magnetic North] from magnetic north. WIND_SPEED_ABV [meters] The wind speed measured above the canopy. _CNPY [second^-1] FRICTION_VELOC [meters] The friction velocity above the canopy. _ABV_CNPY [second^-1] AIR_TEMP_ABV_CNPY [degrees The air temperature measured at 30 meters Celsius] above the ground (above the canopy). AIR_TEMP_10M [degrees The air temperature measured at 10 meters Celsius] above the ground. AIR_TEMP_2M [degrees The air temperature at 2 meters above the Celsius] ground SOIL_T_5CM_SM_BS [degrees The soil temperature recorded at 5 cm depth _SPHAG Celsius] at a plot of stunted black spruce on sphagnum. SOIL_T_10CM_SM_BS [degrees The soil temperature recorded at 10 cm depth _SPHAG Celsius] at a plot of stunted black spruce on sphagnum. SOIL_T_20CM_SM_BS [degrees The soil temperature recorded at 20 cm depth _SPHAG Celsius] at a plot of stunted black spruce on sphagnum. SOIL_T_50CM_SM_BS [degrees The soil temperature recorded at 50 cm depth _SPHAG Celsius] at a plot of stunted black spruce on sphagnum. SOIL_T_100CM_SM [degrees The soil temperature recorded at 1 m depth _BS_SPHAG Celsius] at a plot of stunted black spruce on sphagnum. SOIL_T_5CM_TALL [degrees The soil temperature recorded at 5 cm depth _BS_FEATHER Celsius] at a plot of upland tall black spruce on feather moss. SOIL_T_10CM_TALL [degrees The soil temperature recorded at 10 cm depth _BS_FEATHER Celsius] at a plot of upland tall black spruce on feather moss. SOIL_T_20CM_TALL [degrees The soil temperature recorded at 20 cm depth _BS_FEATHER Celsius] at a plot of upland tall black spruce on feather moss. SOIL_T_50CM_TALL [degrees The soil temperature recorded at 50 cm depth _BS_FEATHER Celsius] at a plot of upland tall black spruce on feather moss. SOIL_T_100CM_TALL [degrees The soil temperature recorded at 1 m depth _BS_FEATHER Celsius] at a plot of upland tall black spruce on feather moss. VAPOR_PRESS_ABV [kiloPascals] The vapor pressure measured above the _CNPY canopy. RAINFALL [millimeters] The amount of rainfall measured above the canopy over the 30 minute period. MONIN_OBUKHOV [meters] The Monin-Obukhov length. _LENGTH CRTFCN_CODE [none] 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 [DD-MON-YY] The most recent date when the information in the referenced data base table record was revised. Data Format ----------- The data file contains numerical and character fields of varying length separated by commas. Character fields are enclosed with single apostrophe marks. There are no spaces between the fields. Each data file on the CD-ROM has four header lines of Hyper-Text Markup Language (HTML) code at the top. When viewed with a Web browser, this code displays header information (data set title, location, date, acknowledgments, etc.) and a series of HTML links to associated data files and related data sets. Line 5 of each data file is a list of the column names, and line 6 and following lines contain the actual data File Names ---------- The different types of files can be told apart by their extensions. The general form of the data file names is Date_Site_Name.csv. The Date_Site part of the name is 22 characters, the Name is 3 characters, and the '.csv' extension is 4 characters (for a total of 30 characters). The formats and meanings of the Date component are: YY-MM-DD : The file only contains data from a particular date YY-MM-00 : The file contains all days of a particular month YY-00-00 : The file contains all days of a particular year ALLDATES : The file contains data over all dates The formats and meanings of the Site component are: MULTIPLESITES : The file contains data over all sites SSS-CCC-TTTTT : The file contains data from a particular site SSS : the BOREAS study area identifier CCC : the abbreviated land cover type at the site TTTTT : the type of site The Name component is a 3-letter identifier for the data set. The '.csv' extension stands for 'comma separated values'.