气候变化领域集成服务门户(CCPortal): Deriving surface soil moisture from reflected GNSS signal observations from a grassland site in southwestern France

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DOI	10.5194/hess-22-1931-2018
	Deriving surface soil moisture from reflected GNSS signal observations from a grassland site in southwestern France
	Zhang S.; Calvet J.-C.; Darrozes J.; Roussel N.; Frappart F.; Bouhours G.
发表日期	2018
ISSN	1027-5606
起始页码	1931
结束页码	1946
卷号	22 期号:3
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).
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
来源期刊	Hydrology and Earth System Sciences
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/160076
作者单位	Zhang, S., CNRM, CNRS, Toulouse, France, Fondation STAE, Toulouse, France; Calvet, J.-C., CNRM, CNRS, Toulouse, France; Darrozes, J., GET, CNRS, Université Paul Sabatier, Toulouse, France; Roussel, N., GET, CNRS, Université Paul Sabatier, Toulouse, France; Frappart, F., GET, CNRS, Université Paul Sabatier, Toulouse, France, CNES, IRD, Toulouse, France; Bouhours, G., CNRM, CNRS, Toulouse, France
推荐引用方式 GB/T 7714	Zhang S.,Calvet J.-C.,Darrozes J.,et al. Deriving surface soil moisture from reflected GNSS signal observations from a grassland site in southwestern France[J],2018,22(3).
APA	Zhang S.,Calvet J.-C.,Darrozes J.,Roussel N.,Frappart F.,&Bouhours G..(2018).Deriving surface soil moisture from reflected GNSS signal observations from a grassland site in southwestern France.Hydrology and Earth System Sciences,22(3).
MLA	Zhang S.,et al."Deriving surface soil moisture from reflected GNSS signal observations from a grassland site in southwestern France".Hydrology and Earth System Sciences 22.3(2018).