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Using long-term water balances to parameterize surface conductances and calculate evaporation at 0.05�spatial resolution

Zhang, Yongqiang, Leuning, Ray, Hutley, Lindsay B., Beringer, Jason, McHugh, Ian and Walker, Jeffrey P. (2010). Using long-term water balances to parameterize surface conductances and calculate evaporation at 0.05�spatial resolution. Water Resources Research,46(5):W05512.

Document type: Journal Article
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IRMA ID 75039815xPUB239
Title Using long-term water balances to parameterize surface conductances and calculate evaporation at 0.05�spatial resolution
Author Zhang, Yongqiang
Leuning, Ray
Hutley, Lindsay B.
Beringer, Jason
McHugh, Ian
Walker, Jeffrey P.
Journal Name Water Resources Research
Publication Date 2010
Volume Number 46
Issue Number 5
ISSN 0043-1397   (check CDU catalogue  open catalogue search in new window)
Scopus ID 2-s2.0-77952271240
Start Page W05512
Total Pages 14
Place of Publication Hoboken, NJ, United States
Publisher Wiley-Blackwell Publishing, Inc.
Abstract [1] Evaporation from the land surface, averaged over successive 8 day intervals and at 0.05° (∼5 km) spatial resolution, was calculated using the Penman-Monteith (PM) energy balance equation, gridded meteorology, and a simple biophysical model for surface conductance. This conductance is a function of evaporation from the soil surface, leaf area index, absorbed photosynthetically active radiation, atmospheric water vapor pressure deficit, and maximum stomatal conductance (gsx). The novelty of this paper is the use of a “Budyko-curve” hydrometeorological model to estimate mean annual evaporation rates and hence a unique value of gsx for each grid cell across the Australian continent. First, the hydrometeorological model was calibrated using long-term water balances from 285 gauged catchments. Second, gridded meteorological data were used with the calibrated hydrometeorological model to estimate mean annual average evaporation () for each grid cell. Third, the value of gsx for each cell was adjusted to equate calculated using the PM equation with from the hydrometeorological model. This closes the annual water balance but allows the PM equation to provide a finer temporal resolution for evaporation than is possible with an annual water balance model. There was satisfactory agreement (0.49 < R2 < 0.80) between 8 day average evaporation rates obtained using remotely sensed leaf area indices, the parameterized PM equation, and observations of actual evaporation at four Australian eddy covariance flux sites for the period 2000–2008. The evaporation product can be used for hydrological model calibration to improve runoff prediction studies in ungauged catchments.
Keywords evaporation
remote sensing
Budyko curve
water balance
surface conductance
Penman-Monteith equation
MODIS leaf area index
DOI http://dx.doi.org/10.1029/2009WR008716   (check subscription with CDU E-Gateway service for CDU Staff and Students  check subscription with CDU E-Gateway in new window)


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