Regional Hydroclimate Project:
CPPA (Climate Prediction Program for the Americas; formerly GAPP)
456 S. Illinois Ave.
Oak Ridge, TN 37830
Telephone: (865) 576-1245
Fax: (865) 576-1327
The flux tower is located at 35.9583 N and 84.2916 W at an elevation of 326 m.
Oak Ridge Regional Map (click for full resolution):
Oak Ridge Local Map (click for full resolution):
The Oak Ridge reference site is located on the Walker Branch Watershed.
Vegetation and Land Use:
The vegetation is a deciduous forest of the eastern hardwood type. The leaf area index varies seasonally with a maximum value of about 5.
Dominanat land cover at the measurement location: Eastern broadwood deciduous Quercus/Carya forest; the Carya was badly destroyed by insect infestations in 1980s.
Canopy height: 24-26 m.
Land cover (approximate percentages of each type) within 50 m of the measurement location: eastern broadleaf forest (Quercas/Carya)
Land cover (approximate percentages of each type) within 500 m of the measurement location (1 km pixel): eastern broadleaf forest (Quercas/Carya)
Land cover (approximate percentages of each type) within 12 km of the measurement location (1/4 degree pixel): 80% deciduous, 10% coniferous, 10% urban
Seasonal land cover changes: yes, LAI greening begins in early April, peaks in mid-May at an LAI of 5-6 with leaves senecsing in late October
Major changes in land cover at the site from October 2002 to December 2004: None
Slope at the site: slope ranges from 5 - 10 %.
Mean elevation and range of elevations in 1 km pixel: range from 250-300 m.
Soil Type and Characterization:
Surface Soil Type: silt loam
Deeper Layers Soil Type: clay
Surface Soil porosity: 60%
Deeper Layers Soil Porosity: 55%
Soil infiltration rate: 50 mm/hour
Bulk dry density: 1.4 g/cm^3
Saturated hydraulic conductivity: .0002 cm/s
Soil Reference Group(s) (from World Reference Base for Soil Resources): Acrisols
Oak Ridge Annual Averages Precipitation.....55.1 inches Days with 0.01" or more of precipitation.....128 Snowfall.....11.1 inches Days with 1.0" or more of snowfall.....4 Days with thunderstorms.....39 Days at or above 90 F.....35 Days with dense fog.....37 Days at or below 32 F.....89 Average first freeze.....October 27 Average last freeze.....April 11 Average first frost.....October 18 Average last frost.....April 26Addtional information at NWS CEOP Parameters Measured and Instrumentation:
SURFACE METEOROLOGY AND RADIATION INSTRUMENTATION AND DESCRIPTION:
- Station pressure height unspecified; Vaisala PTB101B
- Air Temperature height unspecified; Thermometrics PRT
- Dew point height unspecified; derived
- Relative humidity height unspecified; Vaisala 50Y
- Specific humidity height unspecified; derived
- Wind speed height unspecified; RM Young 05103
- Wind direction height unspecified; RM Young 05103
- U wind component height unspecified; derived
- V wind component height unspecified; derived
- Precipitation height unspecified; Hydrol. Serv. TB3
- Snow depth Not measured.
- Incoming shortwave radiation height unspecified; Kipp&Zonen CNR1- CM3
- Outgoing shortwave radiation height unspecified; Kipp&Zonen CNR1- CM3
- Incoming longwave radiation height unspecified; Kipp&Zonen CNR1- CG3
- Outgoing longwave radiation height unspecified; Kipp&Zonen CNR1- CG3
- Net radiation height unspecified; Kipp&Zonen CNR1
- Skin temperature height unspecified; Apogee IRTS-P
- Incoming Photosynthetically Active Radiation (PAR) height and instrumentation unspecified
- Outgoing Photosynthetically Active Radiation (PAR) height and instrumentation unspecified
- Sensible Heat Flux (10 m; Sonic - RM Young 81000V (Gill R2 until 7/02)
- Latent Heat Flux (10 m; Sonic - RM Young 81000V (Gill R2 until 7/02)
- CO2 Flux (
- Soil Heat Flux (4 cm depth - Hukseflux HFP01SC; ATDD thermopiles-2
- Soil temperature (2, 4, 8, 16, 32, 64, 128 cm depths; ATDD Probe with YSI Thermistors)
- Soil moisture (5, 10, 20, 30, 40, 60, and 100 cm depths ; Delta-T PR1/6 (Delta-T Thetaprobes until 7/02)
METEOROLOGICAL TOWER INSTRUMENTATION AND DESCRIPTION:
No data of this type.
FLUX INSTRUMENTATION AND DESCRIPTION:
SOIL INSTRUMENTATION AND DESCRIPTION:
RADIOSONDE INSTRUMENTATION AND DESCRIPTION:
Radiosonde data are from the US National Weather Service station near Glasgow, MT.
- CPPA (13 March 2007; Washington , DC, USA)
- GAPP (10 March 2004; Irvine, Calif ornia, USA)
- GAPP (31 March 2003; Berlin, Germany)
- GAPP (6 March 2002; Tokyo, Japan)
- EOP-3/4 and beyond Data Sets and Documentation
- Surface Meteorological Data: Current Status and Browse Plots
- Soil Temperature and Moisture Data: Current Status and Browse Plots
- Flux Data: Current Status and Browse Plots
- Meteorological Tower Data: Current Status and Browse Plots
- EOP-1 Converted Format Data Sets and Documentation
- EOP-1 Native Format Data Sets and Documentation