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Title
Japanese: 
English:A framework for estimating global‐scale river discharge by assimilating satellite altimetry 
Author
Japanese: Revel Menaka Tisho Kumar, 池嶋 大樹, 山崎 大, 鼎 信次郎.  
English: Menaka Revel, Daiki Ikeshima, Dai Yamazaki, Shinjiro Kanae.  
Language English 
Journal/Book name
Japanese: 
English:Water Resources Research 
Volume, Number, Page Volume 57    Issue 1    e2020WR027876
Published date Jan. 2021 
Publisher
Japanese: 
English: 
Conference name
Japanese: 
English: 
Conference site
Japanese: 
English: 
Official URL https://agupubs.onlinelibrary.wiley.com/doi/full/10.1029/2020WR027876
 
DOI https://doi.org/10.1029/2020WR027876
Abstract Understanding spatial and temporal variations in terrestrial waters is key to assessing the global hydrological cycle. The future Surface Water and Ocean Topography (SWOT) satellite mission will observe the elevation and slope of surface waters at <100 m resolution. Methods for incorporating SWOT measurements into river hydrodynamic models have been developed to generate spatially and temporally continuous discharge estimates. However, most SWOT data assimilation studies have been conducted at the local scale. We developed a novel framework for estimating river discharge at the global scale by incorporating SWOT observations into the CaMa-Flood hydrodynamic model. The local ensemble transform Kalman filter with adaptive local patches was used to assimilate SWOT observations. We tested the framework using multimodel runoff forcing and inaccurate model parameters represented by corrupted Manning's coefficient values. Assimilation of virtual SWOT observations considerably improved river discharge estimates for continental-scale rivers at high latitudes (>50°) and also downstream river reaches at low latitudes. High assimilation efficiency in downstream river reaches was related to both local state correction and the propagation of corrected hydrodynamic states from upstream river reaches. Accurate global river discharge estimates were obtained (Kling-Gupta efficiency [KGE] > 0.90) in river reaches with >270 accumulated overpasses per SWOT cycle when no model error was assumed. Introducing model errors decreased this accuracy (KGE ≈ 0.85). Therefore, improved hydrodynamic models are essential for maximizing SWOT information. These synthetic experiments showed where discharge estimates could be improved using SWOT observations. Further advances are needed for global-scale data assimilation.

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