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	A coupling modulation model of capillary waves from gravity waves: theoretical analysis and experimental validation
	Chen, Pengzhen1,2; Wang, Xiaoqing3; Liu, Li1,2; Chong, Jinsong1
刊名	Journal of geophysical research-oceans
	2016-06-01
卷号	121期号:6页码:4228-4244
ISSN号	2169-9275
DOI	10.1002/2015jc011048
通讯作者	Wang, xiaoqing(huadaqq@126.com)
英文摘要	According to bragg theory, capillary waves are the predominant scatterers of high-frequency band (such as ka-band) microwave radiation from the surface of the ocean. therefore, understanding the modulation mechanism of capillary waves is an important foundation for interpreting high-frequency microwave remote sensing images of the surface of the sea. in our experiments, we discovered that modulations of capillary waves are significantly larger than the values predicted by the classical theory. further, analysis shows that the difference in restoring force results in an inflection point while the phase velocity changes from gravity waves region to capillary waves region, and this results in the capillary waves being able to resonate with gravity waves when the phase velocity of the gravity waves is equal to the group velocity of the capillary waves. consequently, we propose a coupling modulation model in which the current modulates the capillary wave indirectly by modulating the resonant gravity waves, and the modulation of the former is approximated by that of the latter. this model very effectively explains the results discovered in our experiments. further, based on bragg scattering theory and this coupling modulation model, we simulate the modulation of normalized radar cross section (nrcs) of typical internal waves and show that the high-frequency bands are superior to the low-frequency bands because of their greater modulation of nrcs and better radiometric resolution. this result provides new support for choice of radar band for observation of wave-current modulation oceanic phenomena such as internal waves, fronts, and shears.
WOS关键词	SYNTHETIC-APERTURE RADAR ; INTERNAL WAVES ; TANK ; SCATTERING ; SPECTRUM ; CURRENTS
WOS研究方向	Oceanography
WOS类目	Oceanography
语种	英语
出版者	AMER GEOPHYSICAL UNION
WOS记录号	WOS:000383467800032
内容类型	期刊论文
URI标识	http://www.corc.org.cn/handle/1471x/2376162
专题	中国科学院大学
通讯作者	Wang, Xiaoqing
作者单位	1.Chinese Acad Sci, Inst Elect, Natl Key Lab Sci & Technol Microwave Imaging, Beijing, Peoples R China 2.Univ Chinese Acad Sci, Sch Elect Elect & Commun Engn, Beijing, Peoples R China 3.Chinese Acad Sci, Inst Microelect, Commun & Informat Engn R&D Ctr, Beijing 100029, Peoples R China
推荐引用方式 GB/T 7714	Chen, Pengzhen,Wang, Xiaoqing,Liu, Li,et al. A coupling modulation model of capillary waves from gravity waves: theoretical analysis and experimental validation[J]. Journal of geophysical research-oceans,2016,121(6):4228-4244.
APA	Chen, Pengzhen,Wang, Xiaoqing,Liu, Li,&Chong, Jinsong.(2016).A coupling modulation model of capillary waves from gravity waves: theoretical analysis and experimental validation.Journal of geophysical research-oceans,121(6),4228-4244.
MLA	Chen, Pengzhen,et al."A coupling modulation model of capillary waves from gravity waves: theoretical analysis and experimental validation".Journal of geophysical research-oceans 121.6(2016):4228-4244.

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