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Evaporative fluxes and surface soil moisture retrievals in a Mediterranean setting from Sentinel‐3 and the “Simplified Triangle”

Petropoulos Georgios, Sandric Ionut, Christopoulos Dionysios, Carlson Toby N.

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Year 2020
Type of Item Peer-Reviewed Journal Publication
Bibliographic Citation G.P. Petropoulos, I. Sandric, D. Hristopulos and T.N. Carlson, "Evaporative fluxes and surface soil moisture retrievals in a Mediterranean setting from Sentinel‐3 and the “Simplified Triangle,” Remote Sens., vol. 12, no. 19, Sep. 2020. doi: 10.3390/rs12193192
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Earth Observation (EO) makes it possible to obtain information on key parameterscharacterizing interactions among Earth’s system components, such as evaporative fraction (EF)and surface soil moisture (SSM). Notably, techniques utilizing EO data of land surface temperature(Ts) and vegetation index (VI) have shown promise in this regard. The present study investigates,for the first time, the accuracy of one such technique, known as the “simplified triangle”, usingSentinel‐3 EO data, acquired for 44 days in 2018 at three savannah FLUXNET sites in Spain. Thetechnique was found to be able to predict both EF and SSM with reasonable accuracy whencompared to collocated ground measurements. Comparisons performed for all days togethershowed relatively low Root Mean square Difference (RMSD) for both EF (0.191) and SSM (0.012 cm3cm−3) and good correlation coefficients (R) of 0.721 and 0.577, respectively. Both EF and SSM werealso largely in agreement with land cover and seasonal variability. The present study comprises thefirst detailed assessment of the “simplified triangle”, in this case, using Sentinel‐3 data and in aMediterranean setting. Findings, albeit preliminary, are of significant value regarding the use of theinvestigated technique as a tool of environmental management, and towards ongoing, worldwideefforts aiming at developing operationally relevant products based on the Ts/VI feature space andEO data based on new satellites such as Sentinel‐3.

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