Summary
Airborne measurements of reflected solar and emitted thermal radiation were combined with ground-based measurements of incoming solar radiation, air temperature, windspeed, and vapor pressure to calculate instantaneous evaporation (LE) rates using a form of the Penman equation. Estimates of evaporation over cotton, wheat, and alfalfa fields were obtained on 5 days during a one-year period. A Bowen ratio apparatus, employed simultaneously, provided ground-based measurements of evaporation. Comparison of the airborne and ground techniques showed good agreement, with the greatest difference being about 12% for the instantaneous values. Estimates of daily (24 h) evaporation were made from the instantaneous data. On three of the five days, the difference between the two techniques was less than 8%, with the greatest difference being 25%. The results demonstrate that airborne remote sensing techniques can be used to obtain spatially distributed values of evaporation over agricultural fields.
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References
Brutsaert WH (1975) On a derivable formula for long-wave radiation from clear skies. Water Resour Res 11:742
Clothier BE, Clawson KL, Pinter PJ Jr, Moran MS, Reginato RJ, Jackson RD (1986) Estimation of soil heat flux from net radiation during the growth of alfalfa. Agric Forest Meteorol 37:319
Gay LW, Fritschen LJ (1979) An exchange system for precise measurements of temperature and humidity gradients in the air near the ground. Hydrology and Water Resources in Arizona and the Southwest 9:37
Gay LW, Greenberg RJ (1985) The AZET battery-powered Bowen ratio system. Proc of the 17th Conf on Agric and Forest Meteorol, Scottsdale, AZ, Amer Meteorol Soc, Boston, MA, pp 181
Jackson RD (1984) Total reflected solar radiation calculated from multiband sensor data. Agric Forest Meteorol 33:163
Jackson RD (1985) Evaluating evapotranspiration at local and regional scales. Proc IEEE 73:1086
Jackson RD, Hatfield JL, Reginato RJ, Idso SB, Pinter PJ Jr (1983) Estimation of daily evapotranspiration from one time-of-day measurements. Agric Water Mgt 7:351
Jackson RD, Pinter PJ Jr, Reginato RJ (1985) Net radiation calculated from remote multispectral and ground station meteorological data. Agric Forest Meteorol 35:153
Mahrt L, Ek M (1984) The influence of atmospheric stability on potential evaporation. J Climate and Appl Meteorol 23:222
Monteith JL (1973) Principles of Environmental Physics. Edward Arnold, London, pp 241
Penman HL (1948) Natural evaporation from open water, bare soil and grass. Proc Royal Soc London (Ser A) 193:120
Penman HL (1963) Vegetation and Hydrology. Tech Commun No 53, Commonwealth Bureau of Soils, Harpenden, pp 123
Reginato RJ, Jackson RD, Pinter PJ Jr (1985) Evapotranspiration calculated from remote multispectral and ground station meteorological data. Remote Sensing Environ 18:75
Spittlehouse DL, Black TA (1980) Evaluation of the Bowen ratio/energy balance method for determining forest evapotranspiration. Atmos & Oceans 18:98
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Jackson, R.D., Moran, M.S., Gay, L.W. et al. Evaluating evaporation from field crops using airborne radiometry and ground-based meteorological data. Irrig Sci 8, 81–90 (1987). https://doi.org/10.1007/BF00259473
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DOI: https://doi.org/10.1007/BF00259473