SMN-SDR

Country	China
Stations	34
Organisation	Aerospace Information Research Institute, Chinese Academy of Sciences, China
Contacts	Tianjie Zhao
Website	https://doi.org/10.11888/Soil.tpdc.271425 https://doi.org/10.11888/Soil.tpdc.271434
Official References	Zhao, T., Shi, J., Lv, L., Xu, H., Chen, D., Cui, Q., Jackson, T.J., Yan, G., Jia, L., Chen, L., Zhao, K., Zheng, X., Zhao, L., Zheng, C., Ji, D., Xiong, C., Wang, T., Li, R., Pan, J., Wen, J., Yu, C., Zheng, Y., Jiang, L., Chai, L., Lu, H., Yao, P., Ma, J., Lv, H., Wu, J., Zhao, W., Yang, N., Guo, P., Li, Y., Hu, L., Geng, D., Zhang, Z., 2020. Soil moisture experiment in the Luan River supporting new satellite mission opportunities. Remote Sensing of Environment 240, 111680. https://doi.org/10.1016/j.rse.2020.111680; Zheng, J., Zhao, T., Lü, H., Shi, J., Cosh, M.H., Ji, D., Jiang, L., Cui, Q., Lu, H., Yang, K., Wigneron, J.-P., Li, X., Zhu, Y., Hu, L., Peng, Z., Zeng, Y., Wang, X., Kang, C.S., 2022. Assessment of 24 soil moisture datasets using a new in situ network in the Shandian River Basin of China. Remote Sensing of Environment 271, 112891. https://doi.org/10.1016/j.rse.2022.112891;
Abstract	The SMN-SDR was established during the Soil Moisture Experiment in the Luan River of China (SMELR, Zhao et al., 2020), from July 18, 2018 to September 28, 2018. The coverage of entire network is about 10,000 km2 (115.5-116.5°E, 41.5-42.5°N). The topography of the SMN-SDR is relatively flat, and land surfaces are typically dominated by grasslands and croplands. A total of 34 stations are set up in the network with three sampling scales including 100 km (large scale), 50 km (medium scale), and 10 km (small scale). These were initially designed to match different scales of land surface modelling and various satellite products (SMAP, SMOS, AMSR2, and downscaled soil moisture products). The soil moisture sensors used are Decagon 5TM with five measuring depths (3, 5, 10, 20, and 50 cm) installed for each station. Of the 34 station, there are 20 stations equipped with HOBO rain gauges. Undisturbed soil samples at each layer of soil for each station was taken to analyze the gravimetric/volumetric water content, bulk density, and soil texture for a further specific calibration. The power supply is provided by solar panels and all data can be transmitted wirelessly to a server. The sampling interval of the data recording time is 10 (before June 2019) or 15 minutes (after June 2019). This network can improve the comprehensive observation capabilities of key water cycle parameters in the ShanDian River basin and provide long-term ground reference data for satellite- and model-based soil moisture products.
Variables measured	precipitation soil moisture soil temperature
Depths of soil moisture measurements	0.03 - 0.03 m 0.05 - 0.05 m 0.10 - 0.10 m 0.20 - 0.20 m 0.50 - 0.50 m
Soil Moisture sensors used	5TM
Data availability	from 2018-07-25 to 2019-12-31

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