The BOREAS HYD-03 team collected several data sets related to the hydrology of forested areas. This data set contains measurements of canopy density (closure) from a variety of sites. Canopy density measurements were made during the FFC-W and FFC-T 1994 in both the SSA and NSA using a forest densiometer. This study was undertaken to predict spatial distributions of energy transfer, snow properties important to the hydrology, remote sensing signatures, and transmissivity of gases through the snow and their relation to forests in boreal ecosystems.
A text document which includes more information about this data set and other BOREAS HYD-03 Tree Measurments can be found at http://daac.ornl.gov/boreas/HYD/h03candd/comp/HYD03_Tree_Meas.txt. Additional information on Parameter/Variable Names, Variable Description/Definition, Units of Measurement, and Data File Format is available in the companion file http://daac.ornl.gov/boreas/HYD/h03candd/comp/h03candd.def.
Hardy, J. P., and R. E. Davis. 1998. BOREAS HYD-03 Canopy Density Data. Data set. Available on-line [http://www.daac.ornl.gov] from Oak Ridge National Laboratory Distributed Active Archive Center, Oak Ridge, Tennessee, U.S.A. doi:10.3334/ORNLDAAC/258.
Variable 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 identifer for site, exactly what it means will vary with the 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, DD-MON-YYYY. COVER_TYPE The dominant species, vegetation or type of land cover that exists at the location. NUM_OBS Number of observations of the given sample used to calculate given measurements. MEAN_CANOPY_DENSITY The mean canopy desnity at the site. 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.
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Davis, R.E., C. Woodcock, and J.P. Hardy. 1996. Toward spatially distributed modeling of snow in the boreal forest. Eos Transactions, AGU 1995 Fall Meeting, Abstract, p. 218.
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Sellers, P., F. Hall, H. Margolis, B. Kelly, D. Baldocchi, G. den Hartog, J. Cihlar, M.G. Ryan, B. Goodison, P. Crill, K.J. Ranson, D. Lettenmaier, and D.E. Wickland. 1995. The boreal ecosystem-atmosphere study (BOREAS): an overview and early results from the 1994 field year. Bulletin of the American Meteorological Society. 76(9):1549-1577.
Winston, G.C., B.B. Stephens, E.T. Sundquist, J.P. Hardy, and R.E. Davis. 1995. Seasonal variability in gas transport through snow in a boreal forest. In: Biogeochemistry of Seasonally Snow-Covered Catchments (ed. by K. Tonnessen, M.W. Williams, and M. Tranter) (Proc. Boulder Symp., July 1995). IAHS publication no. 228, p. 61-70.