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Comparison of measured brightness temperatures from SMOS with modelled ones from ORCHIDEE and H-TESSEL over the Iberian Peninsula

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Comparison of measured brightness temperatures from SMOS with modelled ones from ORCHIDEE and H-TESSEL over the Iberian Peninsula

dc.contributor.author	Barella-Ortiz, Anaïs
dc.contributor.author	Polcher, Jan
dc.contributor.author	de Rosnay, Patricia
dc.contributor.author	Piles Guillem, Maria
dc.contributor.author	Gelati, Emiliano
dc.date.accessioned	2017-10-10T16:31:53Z
dc.date.available	2017-10-10T16:31:53Z
dc.date.issued	2017
dc.identifier.citation	Barella-Ortiz, Anaïs Polcher, Jan de Rosnay, Patricia Piles Guillem, Maria Gelati, Emiliano 2017 Comparison of measured brightness temperatures from SMOS with modelled ones from ORCHIDEE and H-TESSEL over the Iberian Peninsula Hydrology and Earth System Sciences 21 357 375
dc.identifier.uri	http://hdl.handle.net/10550/61352
dc.description.abstract	L-band radiometry is considered to be one of the most suitable techniques to estimate surface soil moisture (SSM) by means of remote sensing. Brightness temperatures are key in this process, as they are the main input in the retrieval algorithm which yields SSM estimates. The work exposed compares brightness temperatures measured by the SMOS mission to two different sets of modelled ones, over the Iberian Peninsula from 2010 to 2012. The two modelled sets were estimated using a radiative transfer model and state variables from two land-surface models: (i) ORCHIDEE and (ii) H-TESSEL. The radiative transfer model used is the CMEM. Measured and modelled brightness temperatures show a good agreement in their temporal evolution, but their spatial structures are not consistent. An empirical orthogonal function analysis of the brightness temperature's error identifies a dominant structure over the south-west of the Iberian Peninsula which evolves during the year and is maximum in autumn and winter. Hypotheses concerning forcing-induced biases and assumptions made in the radiative transfer model are analysed to explain this inconsistency, but no candidate is found to be responsible for the weak spatial correlations at the moment. Further hypotheses are proposed and will be explored in a forthcoming paper. The analysis of spatial inconsistencies between modelled and measured TBs is important, as these can affect the estimation of geophysical variables and TB assimilation in operational models, as well as result in misleading validation studies.
dc.language.iso	eng
dc.relation.ispartof	Hydrology and Earth System Sciences, 2017, vol. 21, p. 357-375
dc.subject	Imatges Processament Tècniques digitals
dc.subject	Ciències de la terra
dc.title	Comparison of measured brightness temperatures from SMOS with modelled ones from ORCHIDEE and H-TESSEL over the Iberian Peninsula
dc.type	journal article	es_ES
dc.date.updated	2017-10-10T16:31:53Z
dc.identifier.doi	10.5194/hess-21-357-2017
dc.identifier.idgrec	120726
dc.rights.accessRights	open access	es_ES