Abstract
Soil moisture (SM) is a key variable in hydrological processes, bio-ecological processes, and biogeochemical processes. Long-term observations of soil moisture over large areas are critical to research on flooding and drought monitoring, water resource management, and crop yield forecasts. In this paper, Fengyun (FY3B and FY3C) SM products, Japan Aerospace Exploration Agency (JAXA) SM products from the Advanced Microwave Scanning Radiometer 2 (AMSR2), the Land Parameter Retrieval Model (LPRM) AMSR2 L3 SM products, the Version 2 (v2) global land parameter data record (LPDR) of SM products, Soil Moisture Ocean Salinity (SMOS) Centre Aval de Traitement des Données SMOS (CATDS) L3 SM products, the Soil Moisture Active Passive (SMAP) passive L3 SM products and the European Space Agency(ESA) Climate Change Initiative (CCI) SM products were evaluated using the ground-based observations in the Little Washita, Fort Cobb and Yanco networks. Long-time series comparison between measured and satellite products was conducted to evaluate the overall performance of FY3 series satellites SM products. Bias (mean bias), R (correlation coefficient), RMSE (root mean square error) and ubRMSE (unbiased root mean square error) were calculated to explore the agreement between satellite products and in-situ measurements. Taylor diagrams were used to compare the performance of various satellite products. The result showed that (1) FY3B, FY3C and LPRM AMSR2 ascending and descending products had an obvious overestimate with in-situ soil moisture in three networks. (2) JAXA AMSR2 ascending and descending products had considerable underestimation in three networks. (3) The validation result of SMOS ascending and descending products over the three networks was satisfactory, with a rather high correlation than other X-band products. (4) The validation result of SMAP ascending and descending products outperformed the other products over the Little Washita and Fort Cobb networks. (5) The ESA CCI product had the lowest values of RMSE and ubRMSE than the other products in the Yanco network, revealing the effectiveness of merging active and passive soil moisture products. (6)The LPDR descending SM products had better performance than the LPDR ascending SM products in the LW and FC networks.
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Acknowledgements
This work was funded by the National Natural Science Foundation of China (41501409), Natural Science Foundation of Shandong Province (ZR2015DL003). We are indebted to the European Space Agency (ESA), and the Centre Aval de Traitement des Données SMOS (CATDS), Goddard Geoscience Data and Information Service (GES DISC), Japan Aerospace Exploration Agency (JAXA), National Snow and Ice Data Center(NSIDC), NASA MEaSUREs (Making Earth System Data Records for Use in Research Environments), University of Montana and CNSMC for providing the ESA CCI, SMOS, LPRM AMSR2, JAXA AMSR2, LPDR, SMAP,FY3B and FY3C soil moisture products, and the U.S. Department of Agriculture Agricultural Research Service and OzNet hydrological monitoring network for providing the in-situ data.
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Communicated by: H. Babaie
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Yang, G., Guo, P., Li, X. et al. Assessment with remotely sensed soil moisture products and ground-based observations over three dense network. Earth Sci Inform 13, 663–679 (2020). https://doi.org/10.1007/s12145-020-00454-9
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DOI: https://doi.org/10.1007/s12145-020-00454-9