ARS | Publication request: Testing of two source energy balance model under irrigated and dryland conditions using high resolution airborne imagery

Submitted to: ASA-CSSA-SSSA Annual Meeting Abstracts
Publication Type: Abstract Only
Publication Acceptance Date: June 28, 2012
Publication Date: October 23, 2012
Citation: Paul, G., Gowda, P., Prasad, P., Howell, T.A., Staggenborg, S.A., Colaizzi, P.D., Neale, C.M., Hutchinson, S.L., Aiken, R.M. 2012. Testing of two source energy balance model under irrigated and dryland conditions using high resolution airborne imagery [abstract]. ASA-CSSA-SSSA Annual Meeting Abstracts. 2012 CDROM. Paper No 204-6.

Technical Abstract: Two Source Model (TSM) calculates the heat and water exchange and interaction between soil-atmosphere and vegetation-atmosphere separately. This is achieved through decomposition of radiometric surface temperature to soil and vegetation component temperatures either from multi-angular remotely sensed thermal data or from an iteration of respective solution of soil and vegetation energy balance. This study combines high-resolution remote sensing data with field measurements of the agro-meteorological variables and surface energy fluxes to evaluate TSM parameterizations. High resolution aircraft images (0.5**1.8 m)were used, acquired during the Bushland Evapotranspiration and Agricultural Remote Sensing Experiment 2007 and 2008 ( BEAREX07, BEAREX08) conducted at the USDA-ARS Conservation and Production Research Laboratory (CPRL) in Bushland, Texas. The CPRL manages four large weighing lysimeters (3 m long x 3 m wide x 2.4 m deep) with each located in the middle of a 4.3 ha field arranged in a block pattern. Two lysimeter fields, located on the east (NE and SE), are managed under irrigation conditions and two lysimeters on the west (NW and SW) are managed under dryland conditions. Each lysimeter field was equipped with net radiometer, infrared thermometer and soil heat flux plates for measuring net radiation, radiometric surface temperature, and soil heat fluxes, respectively. Apart from the above instrumentation, each lysimeter field had an automated weather station. In addition, a grass reference ET weather station field (0.31 ha), which is a part of the Texas High Plains ET Network, is located on the eastern edge of the irrigated lysimeter fields.