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Analysis of Effective Resistance Calculation Methods and Their Effect on Modelling Evapotranspiration in Two Different Patches of Vegetation in Semi-arid SE Spain : Volume 11, Issue 5 (04/09/2007)

By Were, A.

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Book Id: WPLBN0004010177
Format Type: PDF Article :
File Size: Pages 14
Reproduction Date: 2015

Title: Analysis of Effective Resistance Calculation Methods and Their Effect on Modelling Evapotranspiration in Two Different Patches of Vegetation in Semi-arid SE Spain : Volume 11, Issue 5 (04/09/2007)  
Author: Were, A.
Volume: Vol. 11, Issue 5
Language: English
Subject: Science, Hydrology, Earth
Collections: Periodicals: Journal and Magazine Collection (Contemporary), Copernicus GmbH
Historic
Publication Date:
2007
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications

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Domingo, F., Alados-Arboledas, L., Villagarcía, L., Were, A., & Puigdefábregas, J. (2007). Analysis of Effective Resistance Calculation Methods and Their Effect on Modelling Evapotranspiration in Two Different Patches of Vegetation in Semi-arid SE Spain : Volume 11, Issue 5 (04/09/2007). Retrieved from http://hawaiilibrary.net/


Description
Description: Departamento de Física Aplicada, Universidad de Granada, 18071, Granada, Spain. Effective parameters are of major importance in modelling surface fluxes at different scales of spatial heterogeneity. Different ways to obtain these effective parameters for their use in meso-scale and GCM models have been studied. This paper deals with patch-scale heterogeneity, where effective resistances were calculated in two patches with different vegetation (Retama sphaerocarpa (L.) Boiss shrubs, and herbaceous plants) using different methods: aggregating soil and plant resistances in parallel, in series or by an average of both. Effective aerodynamic resistance was also calculated directly from patch fluxes. To assess the validity of the different methods used, the Penman-Monteith equation was used with effective resistances to estimate the total λE for each patch. The λE estimates found for each patch were compared to Eddy Covariance system measurements. Results showed that for effective surface resistances, parallel aggregation of soil and plant resistances led to λE estimates closer to the measured λE in both patches (differences of around 10%). Results for effective aerodynamic resistances differed depending on the patch considered and the method used to calculate them. The use of effective aerodynamic resistances calculated from fluxes provided less accurate estimates of λE compared to the measured values, than the use of effective aerodynamic resistances aggregated from soil and plant resistances. The results reported in this paper show that the best way of aggregating soil and plant resistances depends on the type of resistance, and the type of vegetation in the patch.

Summary
Analysis of effective resistance calculation methods and their effect on modelling evapotranspiration in two different patches of vegetation in semi-arid SE Spain

Excerpt
Alados-Arboledas, L., Olmo, F. J., Puigdefábregas, J., Domingo, F., and Villagarcía, L.: Using Infrared Remote Sensing for the Estimation of Sensible Heat Flux over Sparse Vegetation in Southeastern Spain, 1–2, Lagos, 2nd Asamblea Hispano Portuguesa de Geodesia y Geofísica, 2000.; Arain, M. A., Shuttleworth, W. J., Yang, Z.- L., Michaud, J., and Dolman, J.: Mapping surface-cover parameters using aggregation rules and remotely sensed cover classes, Q. J. Roy. Meteor. Soc., 123, 2325–2348, 1997.; Baldocchi, D. D., Luxmoore, J., and Hatfield, J. L.: Discerning the forest from the trees: an essay on scaling canopy stomatal conductance, Agr. Forest Meteorol., 54, 197–226, 1991.; Baldocchi, D. D., Falge, E., Gu, L., et al.: FLUXNET: a new tool to study the temporal and spatial variability of ecosystem-scale carbon dioxide, water vapor and energy flux densities, B. Am. Meteorol. Soc., 82, 2415–2434, 2001.; Blyth, E. M., Dolman, A. J., and Wood, N.: Effective resistance to sensible- and latent-heat flux in heterogeneous terrain, Q. J. Roy. Meteor. Soc., 119, 423–442, 1993.; Blyth, E. M.: Using a simple SVAT scheme to describe the effect of scale on aggregation, Bound.-Lay. Meteorol., 72, 267–285, 1995.; Blyth, E. M.: Representing heterogeneity at the southern super site with average surface paramenters, J. Hydrol., 188–189, 869–877, 1997.; Brenner, A. J. and Incoll, L. D.: The effect of clumpling and stomatal response on evaporation from sparsely vegetated shrublands, Agr. Forest Meteorol., 84, 187–205, 1997.; Brutsaert, W.: Heat and mass transfer to and from surfaces with dense vegetation or similar permeable roughness., Bound.-Lay. Meteorol., 16, 365–388, 1979.; Cantón, Y., Solé-Benet, A., and Domingo, F.: Temporal and spatial patterns of soil moisture in semiarid badlands of SE Spain, J. Hydrol., 285, 199–214, 2004.; Chehbouni, A., Lo Seen, D., Njoku, E. G., Lhomme, J. P., Monteny, B. A., and Kerr, Y. H.: Estimation of sensible heat flux over sparsely vegetated surfaces, J. Hydrol., 188–189, 855–868, 1997.; Chehbouni, A., Watts, C., Kerr, Y. H., Dedieu, G., Rodriguez, J. C., Santiago, F., Cayrol, P., Boulet, G., and Goodrich, D. C.: Methods to aggregate turbulent fluxes over heterogeneous surfaces: application to SALSA data ser in Mexico, Agr. Forest Meteorol., 105, 133–144, 2000.; Choudhoury, B. J. and Monteith, J. L.: A four-layer model for the heat budget of homogeneous land surfaces, Q. J. Roy. Meteor. Soc., 114, 373–398, 1988.; Daamen, C. C., Simmonds, L. P., Wallace, J. S., Laryea, K. B., and Sivakumar, M. V. K.: Use of microlysimeters to measure evaporation from sandy soils, Agr. Forest Meteorol., 65, 159–173, 1993.; Dolman, A. J.: A note on areally-averaged evaporation and the value of the effective surface conductance, J. Hydrol., 138, 583–589, 1992.; Dolman, A. J.: A multiple-source land surface energy balance model for use in general circulation models, Agr. Forest Meteorol., 65, 21–45, 1993.; Dolman, A. J. and Blyth, E. M.: Patch scale aggregation of heterogeneous land surface cover for mesoscale meteorological models, J. Hydrol., 190, 252–268, 1997.; Domingo, F., Van Gardingen, P. R., and Brenner, A. J.: Leaf boundary layer conductance of two native species in southeast Spain, Agr. Forest Meteorol., 81, 179–199, 1996.; Domingo, F., Villagarcía, L., Brenner, A. J., and Puigdefábregas, J.: Evapotranspiration model for semi-arid shrub-lands tested against data from SE Spain, Agr. Forest Meteorol., 95, 67–84, 1999.; Domingo, F., Villagarcía, L., Brenner, A. J., and Puigdefábregas, J.: Measuring and modelling the radiation balance of a heterogeneous shrubland, Plant Cell Environ., 23, 27–38, 2000.; Domingo, F., Villagarcía, L. Boer, M. M., Alados-Arboledas, L., and Puigdefábregas, J.: Evaluating the long-te

 

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