Evaluation of an extreme-condition-inverse calibration remote sensing model for mapping energy balance fluxes in arid riparian areas
S.-H. Hong1,*, J. M. H. Hendrickx1, J. Kleissl2, R. G. Allen3, W. G. M. Bastiaanssen4, R. L. Scott5, and A. L. Steinwand61New Mexico Tech, Socorro, NM, USA 2University of California, San Diego, CA, USA 3University of Idaho, Kimberly, ID, USA 4Delft University of Technology, Delft, the Netherlands 5Southwest Watershed Research Center, USDA-ARS, Tucson, AZ, USA 6Inyo County, Water Department, Independence, CA, USA *now at: Murray State University, Murray, KY, USA
Received: 22 Aug 2014 – Accepted for review: 17 Nov 2014 – Discussion started: 10 Dec 2014
Abstract. Accurate information on the distribution of the surface energy balance components in arid riparian areas is needed for sustainable management of water resources as well as for a better understanding of water and heat exchange processes between the land surface and the atmosphere. Since the spatial and temporal distributions of these fluxes over large areas are difficult to determine from ground measurements alone, their prediction from remote sensing data is very attractive as it enables large area coverage and a high repetition rate. In this study the Surface Energy Balance Algorithm for Land (SEBAL) was used to estimate all the energy balance components in the arid riparian areas of the Middle Rio Grande Basin (New Mexico), San Pedro Basin (Arizona), and Owens Valley (California). We compare instantaneous and daily SEBAL fluxes derived from Landsat TM images to surface-based measurements with eddy covariance flux towers. This study presents evidence that SEBAL yields reliable estimates for actual evapotranspiration rates in riparian areas of the southwestern United States. The great strength of the SEBAL method is its internal calibration procedure that eliminates most of the bias in latent heat flux at the expense of increased bias in sensible heat flux.
Hong, S.-H., Hendrickx, J. M. H., Kleissl, J., Allen, R. G., Bastiaanssen, W. G. M., Scott, R. L., and Steinwand, A. L.: Evaluation of an extreme-condition-inverse calibration remote sensing model for mapping energy balance fluxes in arid riparian areas, Hydrol. Earth Syst. Sci. Discuss., 11, 13479-13539, doi:10.5194/hessd-11-13479-2014, 2014.