CarboEurope; Earth observation; ET; Evapotranspiration; SEVIRI; Water management; Global and Planetary Change; Earth-Surface Processes; Computers in Earth Sciences; Management, Monitoring, Policy and Law
Abstract :
[en] This study aimed at evaluating the accuracy of the evapotranspiration (ET) operational estimates from the Meteosat Second Generation (MSG) Spinning Enhanced Visible Infra-Red Imager (SEVIRI) at a range of selected ecosystems in Europe. For this purpose in-situ eddy covariance measurements were used, acquired from 7 selected experimental sites belonging to the CarboEurope ground observational network over 2 full years of observations (2010–2011). Appraisal of ET accuracy was also investigated with respect to land cover, season and each site(s) degree of heterogeneity, the latter being expressed by the fractional vegetation cover (FVC) operational product of SEVIRI. Results indicated a close agreement between the operational product's ET estimates and the tower based in-situ ET measurements for all days of comparison, showing a satisfactory correlation (r of 0.709) with accuracies often comparable to previous analogous studies. For all land cover types, the grassland and cropland sites exhibited the closest agreement (r from 0.705 to 0.759). In terms of seasons the strongest correlations were observed during the summer and autumn (r of 0.714 & 0.685 respectively), and with FVC the highest correlation of 0.735 was observed for the class FVC 0.75-1 when compared against the observed values for the complete monitoring period. Our findings support the potential value of the SEVIRI ET product for regional to mesoscale studies and corroborate its credibility for usage in many practical applications. The latter is of particular importance for water limiting environments, such as those found in the Mediterranean basin, as accurate information on ET rates can provide tremendous support in sustainable water resource management as well as policy and decision making in those areas.
Disciplines :
Earth sciences & physical geography
Author, co-author :
Petropoulos, George P.; Department of Geography and Earth Sciences, Aberystwyth University, Aberystwyth, United Kingdom
Ireland, Gareth; Department of Geography and Earth Sciences, Aberystwyth University, Aberystwyth, United Kingdom
Lamine, Salim; Department of Geography and Earth Sciences, Aberystwyth University, Aberystwyth, United Kingdom ; Department of Ecology and Environment, University of Sciences and Technology Houari Boumediene, Algeria
Griffiths, Hywel M.; Department of Geography and Earth Sciences, Aberystwyth University, Aberystwyth, United Kingdom
Ghilain, Nicolas ; Université de Liège - ULiège > Sphères ; Royal Meteorological Institute, Brussels, Belgium
Anagnostopoulos, Vasileios; Distributed and Knowledge Management Systems Lab, National Technical University of Athens, Greece
North, Matthew R.; Department of Geography and Earth Sciences, Aberystwyth University, Aberystwyth, United Kingdom
Srivastava, Prashant K.; NASA Goddard Space Flight Center, Greenbelt, United States ; Institute of Environment and Sustainable Development, Banaras Hindu University, Varanasi, India
Implementation of this work has been supported by the FP7-People project TRANSFORM-EO (project reference number 334533 as well as the High Performance Computing Facilities of Wales (HPCW) project PREMIER-EO. Dr Petropoulos as the PI of both project wishes to thank both funding bodies for supporting the implementation of this research study. Authors are also grateful to the CarboEurope site managers and to the SEVIRI LSA-SAF team for the provision of the data used in this study. Finally authors wish to thank the reviewers for their valuable comments which helped improving the manuscript.
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