Global pattern of potential evaporation calculated from the Penman-Monteith equation using satellite and assimilated data

Global pattern of potential evaporation calculated from the Penman-Monteith equation using... Potential evaporation has been used to provide a reference level for actual evaporation in many studies of land surface heat and water balance. While Thornthwaite's formula has been used in many regional and global studies, the Penman-Monteith equation has been shown to provide an accurate estimate of this evaporation. Thus, global pattern of potential evaporation has been caleulated from the Penman-Monteith equation using satellite and assimilated data for a 24-month period, January 1987 to December 1988. The albedo and surface resistance have been taken to be, respectively, 0.23 and 70 s m −1 , which are considered to be representative values for actively growing well-watered grass covering the ground. Satellite observations have been used to obtain spatially representative monthly values of solar radiation, fractional cloud cover, air temperature, and vapor pressure, while aerodynamic resistance has been calculated using four-dimensional data assimilation results. Meteorologic data derived from satellite observations are compared with the surface (station) measurements. The calculated potential evaporation values are compared with lysimeter observations for evaporation from well-watered grass at 35 widely distributed locations in different climatic regimes to quantify the accuracy of the calculated values. The evaporation values have been archived for distribution. http://hydro4.gsfc.nasa.gov/STAFF/ChoudhuryBj/pmpotevap.html. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Remote Sensing of Environment Elsevier

Global pattern of potential evaporation calculated from the Penman-Monteith equation using satellite and assimilated data

Remote Sensing of Environment, Volume 61 (1) – Jul 1, 1997

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Publisher
Elsevier
Copyright
Copyright © 1997 Elsevier Ltd
ISSN
0034-4257
D.O.I.
10.1016/S0034-4257(96)00241-6
Publisher site
See Article on Publisher Site

Abstract

Potential evaporation has been used to provide a reference level for actual evaporation in many studies of land surface heat and water balance. While Thornthwaite's formula has been used in many regional and global studies, the Penman-Monteith equation has been shown to provide an accurate estimate of this evaporation. Thus, global pattern of potential evaporation has been caleulated from the Penman-Monteith equation using satellite and assimilated data for a 24-month period, January 1987 to December 1988. The albedo and surface resistance have been taken to be, respectively, 0.23 and 70 s m −1 , which are considered to be representative values for actively growing well-watered grass covering the ground. Satellite observations have been used to obtain spatially representative monthly values of solar radiation, fractional cloud cover, air temperature, and vapor pressure, while aerodynamic resistance has been calculated using four-dimensional data assimilation results. Meteorologic data derived from satellite observations are compared with the surface (station) measurements. The calculated potential evaporation values are compared with lysimeter observations for evaporation from well-watered grass at 35 widely distributed locations in different climatic regimes to quantify the accuracy of the calculated values. The evaporation values have been archived for distribution. http://hydro4.gsfc.nasa.gov/STAFF/ChoudhuryBj/pmpotevap.html.

Journal

Remote Sensing of EnvironmentElsevier

Published: Jul 1, 1997

References

  • Evaluation of some practical methods of estimating evapotranspiration in arid climates at low latitudes
    Brutsaert, W.
  • An advection-aridity approach to estimate actual regional evapotranspiration
    Brutsaert, W.; Stricker, H.
  • Comparison of two models relating precipitable water to surface humidity using globally distributed radiosonde data over land surfaces
    Choudhury, B.J.
  • A climatology of surface radiation budget derived from satellite data
    Darnell, W.L.; Staylor, W.F.; Gupta, S.K.
  • On the variability of net longwave radiation at the ocean surface
    Fung, I.Y.; Harrison, D.E.; Lacis, A.A.
  • Heat Balance Climatology
    Kessler, A.
  • Climate, soil water storage, and the average annual water balance
    Milly, P.C.D.
  • Lysimeter and watershed evapotranspiration
    Mustonen, S.E.; McGuinness, J.L.
  • Evaporation
    Shuttleworth, W.J.

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