Biogeosciences www.biogeosciences.net 1726-4170 1726-4189 6 10 2009 10.5194/bg-6-1975-2009 http://www.biogeosciences.net/6/1975/2009/ http://www.biogeosciences.net/6/1975/2009/bg-6-1975-2009.html http://www.biogeosciences.net/6/1975/2009/bg-6-1975-2009.pdf 1975 1986 2009-10-02 Sensible and latent heat flux from radiometric surface temperatures at the regional scale: methodology and evaluation F. Miglietta f.miglietta@ibimet.cnr.it B. Gioli Y. Brunet R. W. A. Hutjes A. Matese C. Sarrat A. Zaldei IBIMET-CNR, Istituto di Biometeorologia, Consiglio Nazionale delle Ricerche, Via G. Caproni 8, 50145 Firenze, Italy INRA, UR 1263 EPHYSE, BP 81, 33833 Villenave d'Ornon cedex, France Alterra,Wageningen University and Research Centre, Duivendaal 2, 6700 AA Wageningen, The Netherlands CNRM-GAME, Météo-France, 42 avenue G. Coriolis, 31057 Toulouse, France The CarboEurope Regional Experiment Strategy (CERES) was designed to develop and test a range of methodologies to assess regional surface energy and mass exchange of a large study area in the South-Western part of France. This paper describes a methodology to estimate sensible and latent heat fluxes on the basis of net radiation, surface radiometric temperature measurements and information obtained from available products derived from the Meteosat Second Generation (MSG) geostationary meteorological satellite, weather stations and ground-based eddy covariance towers. It is based on a simplified bulk formulation of sensible heat flux that considers the degree of coupling between the vegetation and the atmosphere and estimates latent heat as the residual term of net radiation. Estimates of regional energy fluxes obtained in this way are validated at the regional scale by means of a comparison with direct flux measurements made by airborne eddy-covariance. The results show an overall good matching between airborne fluxes and estimates of sensible and latent heat flux obtained from radiometric surface temperatures that holds for different weather conditions and different land use types. The overall applicability of the proposed methodology to regional studies is discussed. % vor jede Referenz Anderson, M. C., Norman, J. M., Kustas, W. P., Houborg, R., and Starks, P.: A thermal-based remote sensing technique for routine mapping of land-surface carbon, water and energy fluxes from field to regional scales, Remote Sens. Environ., 112(12), 4227–4241, 2008. Aubinet, M., Grelle, A., Ibrom, A., Rannik, U., Moncrieff, J., Foken, T., Kowalski, A., Martin, P. H., Berbigier, P., Bernhofer, C., Clement, R., Elbers, J. 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