DOI: 10.5194/hess-22-1931-2018
Scopus记录号: 2-s2.0-85044218534
论文题名: Deriving surface soil moisture from reflected GNSS signal observations from a grassland site in southwestern France
作者: Zhang S ; , Calvet J ; -C ; , Darrozes J ; , Roussel N ; , Frappart F ; , Bouhours G
刊名: Hydrology and Earth System Sciences
ISSN: 10275606
出版年: 2018
卷: 22, 期: 3 起始页码: 1931
结束页码: 1946
语种: 英语
Scopus关键词: Global positioning system
; Moisture
; Soil moisture
; Soils
; Vegetation
; Global Navigation Satellite Systems
; Ground surfaces
; In-situ observations
; Land surface modeling
; Surface soil moisture
; Vegetation biomass
; Vegetation effects
; Volumetric soil moistures
; Satellite antennas
; comparative study
; GNSS
; grassland
; land surface
; observatory
; reflectometry
; soil moisture
; vegetation dynamics
; water content
; France
英文摘要: This work assesses the estimation of surface volumetric soil moisture (VSM) using the global navigation satellite system interferometric reflectometry (GNSS-IR) technique. Year-round observations were acquired from a grassland site in southwestern France using an antenna consecutively placed at two contrasting heights above the ground surface (3.3 and 29.4 m). The VSM retrievals are compared with two independent reference datasets: In situ observations of soil moisture, and numerical simulations of soil moisture and vegetation biomass from the ISBA (Interactions between Soil, Biosphere and Atmosphere) land surface model. Scaled VSM estimates can be retrieved throughout the year removing vegetation effects by the separation of growth and senescence periods and by the filtering of the GNSS-IR observations that are most affected by vegetation. Antenna height has no significant impact on the quality of VSM estimates. Comparisons between the VSM GNSS-IR retrievals and the in situ VSM observations at a depth of 5 cm show good agreement (R2 D0.86 and RMSED0.04m3 m-3 It is shown that the signal is sensitive to the grass litter water content and that this effect triggers differences between VSM retrievals and in situ VSM observations at depths of 1 and 5 cm, especially during light rainfall events. © 2018 Author(s).
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/79350
Appears in Collections: 气候变化事实与影响
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作者单位: CNRM, CNRS, Toulouse, France; Fondation STAE, Toulouse, France; GET, CNRS, Université Paul Sabatier, Toulouse, France; CNES, IRD, Toulouse, France
Recommended Citation:
Zhang S,, Calvet J,-C,et al. Deriving surface soil moisture from reflected GNSS signal observations from a grassland site in southwestern France[J]. Hydrology and Earth System Sciences,2018-01-01,22(3)