Validation of soil moisture retrieval in arid and semi-arid areas

CORC > 新疆生态与地理研究所 > 中国科学院新疆生态与地理研究所 > 中国科学院新疆生态与地理研究所(2010年以前数据)

	Validation of soil moisture retrieval in arid and semi-arid areas
	Li, Qin1, 2 ; Chen, Xi1 ; Veroustraete, Frank3 ; Bao, An-Ming1 ; Liu, Tie4 ; Wang, Jin-Lin1, 2
刊名	Shuikexue Jinzhan/Advances in Water Science
	2010
卷号	21 期号:2 页码:201-207
关键词	Arid area - Clay type - Experimental data - Land surface temperature - Moderate resolution imaging spectroradiometer - MODIS imagery - Relative errors - Semiarid area - Soil column - Soil moisture content - Soil moisture retrievals - Soil textures - Soil types - Spatial temporals - Thermal inertia - Time Domain Reflectometry - Water balance equation - Water flux - Xinjiang
ISSN号	1001-6791
中文摘要	The objective of this study is to present an approach based on the thermal inertia approach to estimate the profile of soil moisture content (SMC) in the top 1 m soil column using Moderate Resolution Imaging Spectroradiometer (MODIS) imagery. In the approach, both diurnal Land Surface Temperature (LST) difference and broadband albedo (α0) are used to determine the spatial-temporal variation of SMC. The SMC retrieval rationale is that the high Apparent Thermal Inertia (ATI) values represent the high soil moisture contents, and the opposites are true for the low ATI values. The approach assumes that the water flux in the top 1m soil column is proportional to the difference in SMC at the surface and bottom of the soil column. The water balance equation can then be applied over the soil column, which results in the establishment of a relationship between the areal mean of SMC in the soil column and the remotely sensed surface SMC. The established SMC relationship is calibrated using the experimental data and a new soil texture classification technique based on the existing Chinese soil type classification. The SMC relationship is validated over a typical arid and semi-arid area in Xinjiang. The observed soil texture data is used in the application of the SMC relationship. Results show that the SMC relationship has the best performance for the loam and loamy clay types of soils, as the values of estimated SMC are very much close to the Time Domain Reflectometry (TDR) observations. In comparison with the TDR observation, a marginal relative error of 2.16% is found in the estimated SMC in a subarea with the sandy type of soil. Our result demonstrates the potential of using the established SMC relationship to map the spatial-temporal variation of SMC in the top 1 m soil column using the MODIS imagery over arid and semi-arid areas. (12 refs.)
收录类别	EI
公开日期	2011-08-19
内容类型	期刊论文
源URL	[http://ir.xjlas.org/handle/365004/10672]
专题	新疆生态与地理研究所_中国科学院新疆生态与地理研究所(2010年以前数据)
推荐引用方式 GB/T 7714	Li, Qin1, 2,Chen, Xi1,Veroustraete, Frank3,et al. Validation of soil moisture retrieval in arid and semi-arid areas[J]. Shuikexue Jinzhan/Advances in Water Science,2010,21(2):201-207.
APA	Li, Qin1, 2,Chen, Xi1,Veroustraete, Frank3,Bao, An-Ming1,Liu, Tie4,&Wang, Jin-Lin1, 2.(2010).Validation of soil moisture retrieval in arid and semi-arid areas.Shuikexue Jinzhan/Advances in Water Science,21(2),201-207.
MLA	Li, Qin1, 2,et al."Validation of soil moisture retrieval in arid and semi-arid areas".Shuikexue Jinzhan/Advances in Water Science 21.2(2010):201-207.