1.0 DOCUMENT INFORMATION
1.1 Document Title: TDE Daily Climate Data
1.2 Revision Date: 30 April 2007
1.3 Document Summary: Daily climate variables from the TDE site for 1993 through 2006.
1.4 Sponsor: Office of Biological and Environmental Research, U. S. DOE
2.1 Investigator and data set contact:
P.J. Hanson (firstname.lastname@example.org)2.2 Title Of Investigation:
Research Staff Member
Environmental Sciences Division
Oak Ridge National Laboratory
P.O. Box 2008
Oak Ridge, TN 37830-6038
3.0 DATA SUMMARY
Daily integrated or averaged values for incident photosynthetically active radiation, incident total radiation, air temperature, relative humidity, rainfall, and soil temperature at 10-15 cm.
Measurements of incoming rainfall, irradiance (Pyranometer sensor, LiCor Inc.) and photosynthetic photon flux density (Quantum sensor, LiCor Inc.) were obtained in a nearby clearing until 1998 when above canopy observations were added to the ambient plot tower. Clearing data were used to represent "above-canopy" conditions for the experimental site for the years 1993-1997. Two tipping bucket rain gauges with 3 m extension troughs attached are installed on each plot to evaluate the amount of throughfall reaching the forest floor. Sub-canopy air temperatures (2 stations per treatment plot) are made at approximately 1 m of height in a location shielded from direct solar radiation. Soil temperatures are measured at two depths (15 and 35 cm) and 4 locations per plot. All temperatures are measured with thermistors. Climate data are collected as hourly means and logged on data loggers (Li-1000, LiCor Inc.) housed in instrument enclosures located at one upslope and one downslope location per treatment plot, and one enclosure in the nearby clearing.
5.0 OBSERVATION NOTES
6.0 DATA ORGANIZATION
Data are provided in comma delimeted text files where the first line includes the variable names and subsequent lines include the following data by month.
6.1 Variable, Definition, and Units
Column 2 = Quan
Integrated incident photosynthetically active radiation in mol m-2
Column 3 = Pyran
Integrated incident total radiation in MJ m-2
Column 4 = Radmean
Mean daily radiation in W m-2 or J s-1 m-2.
Column 5 = Rain
Rain in mm. Hourly values summed over each day.
Column 6 = Wind (Years prior to 1997 do not have this
Wind in m s-1. Hourly values averaged over the day.
Column 7 = ATmin
Daily or monthly 1 hour minimum air temperature in degrees C
Column 8 = ATmean
Daily or monthly mean 1 hour air temperature in degrees C
Column 9 = ATmax
Daily or monthly 1 hour maximum air temperature in degrees C
Column 10 = RHmin
Daily or monthly 1 hour minimum relative humidity in percent
Column 11 = RHmean
Daily or monthly mean 1 hour value
Column 12 = RHmax
Daily or monthly 1 hour maximum relative humidity in percent
Column 13 = STmin
Daily or monthly 1 hour minimum soil temperature (15 cm) in degrees C
Column 14 = STmean
Daily or monthly mean 1 hour soil temperature (15 cm) in degrees C
Column 15 = STmax
Daily or monthly 1 hour maximum soil temperature (15 cm) in degrees C
Column 16 = LTmean (available for some years)
Daily or monthly 1 hour mean litter layer (Oi) temperature in degrees C
7.0 KNOWN ERRORS AND QUALITY ASSESSMENT
These daily data and the original hourly data from which they were derived have been checked for errors and missing data. If bad or missing data were found approximate replacement data were obtained from other weather data sources in the area.
8.1 Limitations of the data: None.
8.2 Known Problems With The Data: None.
8.3 Usage Guidance: None.
Hanson PJ, Todd DE, Huston MA (2003) Walker Branch Throughfall Displacement Experiment (TDE) In: Hanson PJ, Wullschleger SD, Eds, North American Temperate Deciduous Forest Responses to Changing Precipitation Regimes. Springer, New York, pp. 8-31.
Hanson, P.J. , D.E.Todd and J.S. Amthor. 2001. A six year study of sapling and large-tree growth and mortality responses to natural and induced variability in precipitation and throughfall. Tree Physiology 21: 345-358.
Hanson P.J. 2000. Large-scale Water Manipulations -- chapter 23 In: O.E. Sala, R.B. Jackson, H.A. Mooney, and R.W. Howarth, eds. Methods in Ecosystem Science, Springer-Verlag, New York. pp. 341-352.
Hanson, P.J., D.E. Todd, N.T. Edwards, and M.A. Huston. 1995. Field performance of the Walker Branch Throughfall Displacement Experiment, In: A. Jenkins, R.C. Ferrier, and C. Kirby, eds., Ecosystem Manipulation Experiments: scientific approaches, experimental design and relevant results, Ecosystem Research Report #20, Commission of the European Communities, pp. 307-313.
Hanson, P.J., D.E. Todd, M.A. Huston, J.D. Joslin, Jennifer
and R. M. Augé. 1998. Description and field
the Walker Branch Throughfall Displacement Experiment: 1993-1996,
Oak Ridge National Laboratory, Oak Ridge, Tennessee.
10.0 DATA LISTING
Click on the following to view data for the listed year.
Once open the files can exported as text files with the 'Save As' command.
Daily data for 1993
Daily data for 1994
Daily data for 1995
Daily data for 1996
Daily data for 1997
Daily data for 1998
Daily data for 1999
Daily data for 2000
Daily data for 2001
Daily data for 2002
Daily data for 2003
Daily data for 2003 with modified quantum data 30 Apr 2007
Daily data for 2004
Daily data for 2004 with modified quantum data 30 Apr 2007
Daily data for 2005
Daily data for 2005 with modified quantum data 30 Apr 2007
Daily data for 2006