Generation of root zone soil moisture from the integration of an all-weather satellite surface soil moisture estimates and an analytical model: A preliminary result in China

文献类型： 外文期刊

第一作者： Wang, Yanyan

作者： Wang, Yanyan;Leng, Pei;Song, Qian;Li, Zhao-Liang;Wang, Yanyan;Wang, Yanyan;Mad, Jianwei;Manfreda, Salvatore;Ma, Chunfeng;Shang, Guo-Fei;Zhang, Xia

作者机构：

关键词： Surface soil moisture; Root zone soil moisture; Soil moisture analytical model; ERA5-Land; CLDAS

期刊名称：JOURNAL OF HYDROLOGY （ 影响因子：6.3； 五年影响因子：6.9 ）

ISSN： 0022-1694

年卷期： 2024 年 644 卷

页码：

收录情况： SCI

摘要： In addition to surface soil moisture (SSM) data, root zone soil moisture (RZSM) is particularly significant for irrigation decision-making and agricultural drought warnings since water uptake generally occurs through the root systems of plants. In this study, a daily/0.05 degrees RZSM dataset covering the major land areas of China was generated from the synergistic use of satellite-derived SSM estimates and a RZSM-SSM analytical model. First, based on the SSM and RZSM datasets generated from the fifth generation of atmospheric reanalysis (ERA5-Land), the Markov Chain Monte Carlo algorithm was applied to optimize the soil moisture analytical relationship (SMAR) model to determine four essential parameters pixel-to-pixel over the study area. In addition, the optimized SMAR parameters were integrated with satellite-derived daily/0.05 degrees SSM to predict the daily/0.05 degrees RZSM in China. Finally, due to the lack of in situ RZSM measurements ground truth at a spatial resolution of 0.05 degrees, two RZSM products, namely the Soil Moisture Active Passive (SMAP)-based RZSM and the China Meteorological Administration Land Data Assimilation System (CLDAS)-based RZSM, were used as references to preliminarily assess the estimated data. The results showed overall fair correlations between SMAP_RZSM and estimated RZSM (correlation coefficient R varying from 0.557 to 0.655), and between CLDAS_RZSM and estimated RZSM (correlation coefficient R varying from 0.496 to 0.596) over four typical days representing spring, summer, autumn, and winter in 2019. Although the proposed approach may overestimate or underestimate RZSM compared to the two referenced products in different seasons, an overall acceptable accuracy with unbiased root mean square error of similar to 0.070-0.090 cm(3)/cm(3) was obtained.

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