Emissivity measurements and theoretical model of foam-covered sea surface at C-band

	Emissivity measurements and theoretical model of foam-covered sea surface at C-band
	Wei, En-Bo ; Liu, Shu-Bo ; Wang, Zhen-Zhan ; Liu, Jing-Yi ; Dong, Shuai
刊名	INTERNATIONAL JOURNAL OF REMOTE SENSING
	2014
卷号	35 期号:4 页码:1511-1525
ISSN号	0143-1161
通讯作者	北京8701信箱
中文摘要	To investigate the effects of sea foam (or whitecaps) on the emissivity of sea surface, microwave radiometric experiments of foam-covered sea surface at C-band (6.8 GHz) were conducted by artificial foam during September 2012 at Tangdao bay of Qingdao. The sea surface temperatures (SST) were from 22°C to 26.4°C, and the thickness and the air bubble size of the foam layer were controlled by a compressed air pump and monitored with a video recorder. The emissivities were obtained with the measured brightness temperatures. Furthermore, based on the experimental data, a theoretical model of sea foam emissivity is proposed by the wave approach method of two-layer medium, where the foam complex permittivity is estimated by an effective medium approximation. Experimental results show that the averaged emissivity increments of both horizontal and vertical polarizations are approximately from 0.25 to 0.35 for 1 cm of foam thickness with different SST and air volume fractions (AVF). For a given thickness of the foam layer, although both AVF and SST play important roles in increasing the sea surface emissivity, the influence of AVF on the emissivity is much stronger than that of SST. The brightness temperature increases by about 113K compared to that of the foam-free surface. Moreover, the theoretical model implies that the emissivity is increased during the initial aggregation process of foam, and then fluctuates on increasing the foam thickness up to a larger saturation value. The effect of the meniscus at the foam–water boundary on foam emissivity is also discussed.
学科主题	微波遥感
收录类别	SCI
语种	英语
内容类型	期刊论文
源URL	[http://ir.nssc.ac.cn/handle/122/2785]
专题	国家空间科学中心_微波遥感部
推荐引用方式 GB/T 7714	Wei, En-Bo,Liu, Shu-Bo,Wang, Zhen-Zhan,et al. Emissivity measurements and theoretical model of foam-covered sea surface at C-band[J]. INTERNATIONAL JOURNAL OF REMOTE SENSING,2014,35(4):1511-1525.
APA	Wei, En-Bo,Liu, Shu-Bo,Wang, Zhen-Zhan,Liu, Jing-Yi,&Dong, Shuai.(2014).Emissivity measurements and theoretical model of foam-covered sea surface at C-band.INTERNATIONAL JOURNAL OF REMOTE SENSING,35(4),1511-1525.
MLA	Wei, En-Bo,et al."Emissivity measurements and theoretical model of foam-covered sea surface at C-band".INTERNATIONAL JOURNAL OF REMOTE SENSING 35.4(2014):1511-1525.