气候变化领域集成服务门户(CCPortal): Impact of soil moisture dynamics on ASAR sigma degrees signatures and its spatial variability observed over the Tibetan plateau

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DOI	10.3390/s8095479
	Impact of soil moisture dynamics on ASAR sigma degrees signatures and its spatial variability observed over the Tibetan plateau
	van der Velde, Rogier; Su, Zhongbo; Ma, Yaoming
通讯作者	van der Velde, R (通讯作者)
发表日期	2008
ISSN	1424-8220
起始页码	5479
结束页码	5491
卷号	8 期号:9
英文摘要	This paper reports on the analysis of a 2.5 year-long time series of ASAR wide swath mode (WSM) observations for characterizing the soil moisture dynamics. The employed ASAR WSM data set consists of 152 VV-polarized scenes acquired in the period between April 2005 and September 2007 over the Naqu river basin located on the Tibetan Plateau. For four different spatial domains, with areas of 30x30 km(2), 5x5 km(2) and ( two domains of) 1x1 km(2), the mean backscatter (sigma degrees) and the standard deviation (stdev) have been computed for each ASAR acquisition. Comparison of the mean sigma degrees values with the stdev values results in a specific triangular distribution of data points for all spatial domains. Analysis of the mean sigma degrees and stdev with respect to in-situ soil moisture measurements demonstrates that this triangular shaped distribution can be explained by soil moisture dynamics during monsoon and winter periods. This shows that the relationship between the spatial mean soil moisture and variability is not uniquely defined and may change throughout seasons. Downscaling of coarse resolution soil moisture products should, therefore, be ideally based on additional near real time data sources. In this context, the presented results could form a basis for the development of SAR-based soil moisture downscaling methodologies.
关键词	REMOTE-SENSING FOOTPRINTS WIND SCATTEROMETER DATA BACKSCATTER FIELD TRANSECT SURFACE
英文关键词	soil moisture dynamics; ASAR; time series; Tibetan Plateau
语种	英语
WOS研究方向	Chemistry ; Engineering ; Instruments & Instrumentation
WOS类目	Chemistry, Analytical ; Engineering, Electrical & Electronic ; Instruments & Instrumentation
WOS记录号	WOS:000259735700015
来源期刊	SENSORS
来源机构	中国科学院青藏高原研究所
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/257543
推荐引用方式 GB/T 7714	van der Velde, Rogier,Su, Zhongbo,Ma, Yaoming. Impact of soil moisture dynamics on ASAR sigma degrees signatures and its spatial variability observed over the Tibetan plateau[J]. 中国科学院青藏高原研究所,2008,8(9).
APA	van der Velde, Rogier,Su, Zhongbo,&Ma, Yaoming.(2008).Impact of soil moisture dynamics on ASAR sigma degrees signatures and its spatial variability observed over the Tibetan plateau.SENSORS,8(9).
MLA	van der Velde, Rogier,et al."Impact of soil moisture dynamics on ASAR sigma degrees signatures and its spatial variability observed over the Tibetan plateau".SENSORS 8.9(2008).