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B. Barrett, C. Pratola, A. Gruber, Ned Dwyer:
"Intercomparison of soil moisture retrievals from in situ, ASAR and ECV SM data sets over different European sites";
in: "Satellite Soil Moisture Retrievals: Techniques and Applications", P. Srivastava, G. Petropoulos, Y. Kerr (ed.); Elsevier, Amsterdam, 2016, ISBN: 9780128033883, 209 - 228.

The availability of satellite-derived global surface soil moisture products during the last decade has opened up great opportunities to incorporate these observations into applications in hydrology, meteorology, and climatic modeling. This study evaluates a new global soil moisture product developed under the framework of the European Space Agency (ESA) climate change initiative (CCI), using finer spatial resolution synthetic aperture radar (SAR) and ground-based measurements of soil moisture. The analysis is carried out over selected in situ networks over Ireland, Spain, and Finland with the aim of assessing the temporal representativeness of the coarse-scale CCI essential climate variable (ECV) soil moisture (ECV SM) product in these different areas. A good agreement (correlation coefficient (R) values between 0.53 and 0.92) was observed between the three soil moisture data sets for the Irish and Spanish sites while a reasonable agreement (R values between 0.41 and 0.52) was observed between the SAR and ECV SM soil moisture data sets at the Finnish sites. Overall, the two different satellite-derived products captured the soil moisture temporal variations well and were in good agreement with each other, highlighting the confidence of using the coarse-scale ECV SM product to track soil moisture variability in time.

http://dx.doi.org/10.1016/B978-0-12-803388-3.00011-5