A Theoretical Model for the Microwave Emissivity of Rough Sea Surfaces

IOCAS-IR

	A Theoretical Model for the Microwave Emissivity of Rough Sea Surfaces
	YANG Zhenlin ; WEI Enbo ; GAO Peng
发表期刊	Journal of Ocean University of China
ISSN	1672-5182
	2022-12-06
出版年	2022
卷号	v.21 期号:06 页码:6-13
文献类型	CNKI期刊论文
摘要	When sea surface wavelengths are not larger than microwave wavelengths, the microwave emissivity of Gaussian rough sea surfaces can be investigated by applying effective media theory(EMT) of rough surfaces. For one-dimensional Gaussian sea surface,the microwave emissivity model is proposed by EMT, which regards the air-sea rough interface as a new effective medium of isotropic permittivity between the top layer of air and the bottom layer of seawater. The emissivity model is controlled by the root mean square deviation(RMSD) of the rough surface height and the correlation length of the rough surface. Results clearly show that the emissivity increases along with the RMSD increase if the latter is smaller than a critical value. Furthermore, excess emissivities and the brightness temperature increments for a wind-roughened sea surface can be estimated from those of flat surfaces by fitting the RMSD as a function of wind speed. Good agreements are obtained by comparing the results of our model with the satellite data at microwave frequencies of 1.4, 6.8, 18, 21, and 37 GHz, respectively. Moreover, these findings imply that our method can be extended to retrieve the sea surface parameters, such as RMSD and the correlation length of the rough surface, from the satellite data.
关键词	rough surfaces microwave emissivity dielectric constant effective media theory
CNKI专辑号	A;
CNKI专辑名称	基础科学;
CNKI专题号	A010;
CNKI专题名称	海洋学;
分类号	P715.7
收录类别	中科院核心 ; 中科院扩展
语种	英文;
资助项目(基金）	supported by the National Natural Science Foundation of China (No. 41676169) ; the National Key R&D Program of China (No. 2016YFC1401 006)
文献类型	CNKI期刊论文
条目标识符	http://ir.qdio.ac.cn/handle/337002/187242
专题	中国科学院海洋研究所
作者单位	1.SchoolofMathematicsandPhysics,QingdaoUniversityofScienceandTechnology 2.InstituteofOceanologyandCenterforOceanMega-Science,ChineseAcademyofSciences,andQingdaoNationalLaboratoryforMarineScienceandTechnology
推荐引用方式 GB/T 7714	YANG Zhenlin,WEI Enbo,GAO Peng. A Theoretical Model for the Microwave Emissivity of Rough Sea Surfaces. 2022.