The energy flux station is designed to measure how the shrub-steppe habitat of the Idaho National Laboratory (INL) interacts with the global energy cycle. To accomplish this, a suite of measurements are made on two separate towers (shown below) and in the soil subsurface. The energy flux station is located at Grid 3 approximately 100 m NE of the profiler building (or approximately 500 m NE of the camera building). The station began collecting data in 2000.
Slow Response Tower
The slow response tower measures the net radiation, air temperature, relative humidity, barometric pressure, and solar radiation. Net radiation measurements are made by Kipp and Zonen (model NR-LITE-L) and mounted at 2.5 m. Air temperature and relative humidity measurements are made by Visalia (model HMP45C) and mounted at 1.5 m. Barometric pressure measurements are made by Visalia (model PTB101B) and mounted at 1 m. Solar radiation measurements are made by LICOR (model LI200X-L) and mounted at 2.5 m. This tower records averages that transferred back to FRD. From its inception in 2000 data was collected and saved on a Campbell CR23 datalogger at 30-minute averages then changed to 5-minute averages on October 10, 2008.
Fast Response Tower
The fast response tower houses a sonic anemometer and an open path infrared gas analyzer. This second tower is used to measure the fluxes of momentum, sensible heat, latent heat, and carbon dioxide. The sonic anemometer is a Gill, model 1210R3, and the infrared gas analyzer is a LICOR (model 7500). The anemometer and infrared gas analyzer are mounted at heights of 3.2 and 2.54 m, respectively. The fast response tower records data at 10 HZ.
The subsurface sensors make measurements of soil temperature, soil moisture, and soil heat flux. Two soil temperature measurements are made by Campbell Scientific (model TCAV-L) using two paired sensors at depths of 2 and 6 cm below the surface. One of the paired sensors are located in a shady area covered by sagebrush while the other paired sensor is located in an open area. Soil moisture measurements are made by Campbell Scientific (model CS616) at a depth of 2.5 cm. Soil heat flux is measured by 4 flux plates made by Hukseflux (model HFP01SC) and located at a depth of 8 cm.
Energy flux towers located at Grid 3.