Global-Scale Evaluation of Roughness Effects on C-Band AMSR-E Observations

	Global-Scale Evaluation of Roughness Effects on C-Band AMSR-E Observations
	Wang, Shu 1; Wigneron, Jean-Pierre 1; Jiang, Ling-Mei 1; Parrens, Marie 1; Yu, Xiao-Yong 1; Al-Yaari, Amen 1; Ye, Qin-Yu 1; Fernandez-Moran, Roberto 1; Ji, Wei 1; Kerr, Yann 1
刊名	REMOTE SENSING
	2015
卷号	7 期号:5 页码:6005-6025
通讯作者	Wang, S (reprint author), Beijing Normal Univ, State Key Lab Remote Sensing Sci, Beijing 100875, Peoples R China.
英文摘要	Quantifying roughness effects on ground surface emissivity is an important step in obtaining high-quality soil moisture products from large-scale passive microwave sensors. In this study, we used a semi-empirical method to evaluate roughness effects (parameterized here by the Hr parameter) on a global scale from AMSR-E (Advanced Microwave Scanning Radiometer for EOS) observations. AMSR-E brightness temperatures at 6.9 GHz obtained from January 2009 to September 2011, together with estimations of soil moisture from the SMOS (Soil Moisture and Ocean Salinity) L3 products and of soil temperature from ECMWF's (European Centre for Medium-range Weather Forecasting) were used as inputs in a retrieval process. In the first step, we retrieved a parameter (referred to as the a* parameter) accounting for the combined effects of roughness and vegetation. Then, global MODIS NDVI data were used to decouple the effects of vegetation from those of surface roughness. Finally, global maps of the Hr parameters were produced and discussed. Initial results showed that some spatial patterns in the Hr values could be associated with the main vegetation types (higher values of Hr were retrieved generally in forested regions, intermediate values were obtained over crops and grasslands, and lower values were obtained over shrubs and desert) and topography. For instance, over the USA, lower values of Hr were retrieved in relatively flat regions while relatively higher values were retrieved in hilly regions.
研究领域[WOS]	Remote Sensing
收录类别	SCI ; EI
语种	英语
WOS记录号	WOS:000357597000001
内容类型	期刊论文
源URL	[http://ir.ceode.ac.cn/handle/183411/38438]
专题	遥感与数字地球研究所_SCI/EI期刊论文_期刊论文
作者单位	1.[Wang, Shu 2.Jiang, Ling-Mei 3.Yu, Xiao-Yong 4.Ye, Qin-Yu] Beijing Normal Univ, State Key Lab Remote Sensing Sci, Beijing 100875, Peoples R China 5.[Wang, Shu 6.Jiang, Ling-Mei 7.Yu, Xiao-Yong 8.Ye, Qin-Yu] Beijing Normal Univ, Sch Geog, Beijing 100875, Peoples R China 9.[Wang, Shu 10.Wigneron, Jean-Pierre
推荐引用方式 GB/T 7714	Wang, Shu,Wigneron, Jean-Pierre,Jiang, Ling-Mei,et al. Global-Scale Evaluation of Roughness Effects on C-Band AMSR-E Observations[J]. REMOTE SENSING,2015,7(5):6005-6025.
APA	Wang, Shu.,Wigneron, Jean-Pierre.,Jiang, Ling-Mei.,Parrens, Marie.,Yu, Xiao-Yong.,...&Kerr, Yann.(2015).Global-Scale Evaluation of Roughness Effects on C-Band AMSR-E Observations.REMOTE SENSING,7(5),6005-6025.
MLA	Wang, Shu,et al."Global-Scale Evaluation of Roughness Effects on C-Band AMSR-E Observations".REMOTE SENSING 7.5(2015):6005-6025.