Articles | Volume 28, issue 11
https://doi.org/10.5194/hess-28-2375-2024
https://doi.org/10.5194/hess-28-2375-2024
Research article
 | 
05 Jun 2024
Research article |  | 05 Jun 2024

Evaluation of root zone soil moisture products over the Huai River basin

En Liu, Yonghua Zhu, Jean-Christophe Calvet, Haishen Lü, Bertrand Bonan, Jingyao Zheng, Qiqi Gou, Xiaoyi Wang, Zhenzhou Ding, Haiting Xu, Ying Pan, and Tingxing Chen

Data sets

GLDAS Noah Land Surface Model L4 3 hourly 0.25×0.25 degree V2.1 H. Beaudoing et al. https://doi.org/10.5067/E7TYRXPJKWOQ

CATDS-PDC L4SM RZSM – 1 day global map of root zone soil moisture values from SMOS satellite CATDS https://doi.org/10.12770/316e77af-cb72-4312-96a3-3011cc5068d4

The Near-Real-Time Product Dataset Of The China Meteorological Administration Land Data Assimilation System (CLDAS-V2.0) CMA https://data.cma.cn/data/cdcdetail/dataCode/NAFP_CLDAS2.0_NRT.html

inst3_3d_asm_Cp: MERRA-2 3D IAU State, Meteorology Instantaneous 3-hourly (p-coord, 0.625x0.5L42) GMAO https://doi.org/10.5067/VJAFPLI1CSIV

ERA5 hourly data on single levels from 1940 to present H. Hersbach https://doi.org/10.24381/cds.adbb2d47

GLDAS Catchment Land Surface Model L4 daily 0.25×0.25 degree GRACE-DA1 V2.2 B. Li et al. https://doi.org/10.5067/TXBMLX370XX8

In situ root zone soil moisture measurements.xls En Liu https://doi.org/10.6084/m9.figshare.23497502.v2

SMAP L4 Global 3-hourly 9km EASE-Grid Surface and Root Zone Soil Moisture Geophysical Data R. Reichle et al. https://doi.org/10.5067/9LNYIYOBNBR5

NCEP Climate Forecast System Version 2 (CFSv2) 6-hourly Products Suranjana Saha et al. https://doi.org/10.5065/D61C1TXF

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Short summary
Overestimated root zone soil moisture (RZSM) based on land surface models (LSMs) is attributed to overestimated precipitation and an underestimated ratio of transpiration to total evapotranspiration and performs better in the wet season. Underestimated SMOS L3 surface SM triggers the underestimated SMOS L4 RZSM, which performs better in the dry season due to the attenuated radiation in the wet season. LSMs should reduce and increase the frequency of wet and dry soil moisture, respectively.