A Diagnostic Approach toward the Causes of Energy Balance Closure Problem

Surface measurements of sensible and latent heat energy (LE) are often underestimated in hydrometeorological models. We studied this problem in four fields (corn, soybean, and prairie) in central Iowa. We estimated energy storage in the soil, canopy, and air; data indicated the imbalance was largest during the cold non-growing season when the soil was dry. Prevailing weather conditions seem to mainly control the energy balance residual. However, precise quantification of causes of imbalance is site-specific. Our results suggest that a-posteriori analysis may offer a better way to correct measured eddy-correlation measurements. Furthermore, the overall trends in the correction of LE measurements suggest that there is a potential for rough monthly corrections of latent heat energy, irrespective of the type of crop.

Varmaghani, A., Eichinger, W.E., and Prueger, J.H. “A Diagnostic Approach toward the Causes of Energy Balance Closure Problem,” Open Journal of Modern Hydrology, 6, 2016, pp. 101–114.