| 基于EOF分析对南海西北海域水体光谱特性的研究 |
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| 引用本文： | 付东洋,黄宇业,刘大召,廖珊,余果,张小龙.基于EOF分析对南海西北海域水体光谱特性的研究[J].海洋学报(英文版),2020,39(7):107-114. |
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| 作者姓名： | 付东洋 黄宇业 刘大召 廖珊 余果 张小龙 |
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| 作者单位： | 电子与信息工程学院, 广东海洋大学, 湛江, 524088;热带海洋环境国家重点实验室, 中国科学院南海海洋研究所, 广州, 510301;中国科学院大学, 北京, 100049 |
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| 基金项目： | The Key Projects of the Guangdong Education Department under contract No. 2019KZDXM019; the Fund of Southern Marine Science and Engineering Guangdong Laboratory (Zhanjiang) under contract No. ZJW-2019-08; High-Level Marine Discipline Team Project of Guangdong Ocean University under contract No. 002026002009; the Guangdong Graduate Academic Forum Project under contract No.230420003; the "First Class" discipline construction platform project in 2019 of Guangdong Ocean University under contract No. 231419026. |
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| 摘 要： | This study presents an analysis of the spectral characteristics of remote sensing reflectance(R_(rs)) in northwestern South China Sea based on the in situ optical and water quality data for August 2018.R_(rs)was initially divided into four classes,classes A to D,using the max-classification algorithm,and the spectral properties of whole R_(rs) were characterized using the empirical orthogonal function(EOF) analysis.Subsequently,the dominant factors in each EOF mode were determined.The results indicated that more than 95% of the variances of R_(rs) are partly driven by the back-scattering characteristics of the suspended matter.The initial two EOF modes were well correlated with the total suspended matter and back-scattering coefficient.Furthermore,the first EOF modes of the four classes of R_(rs)(A-D R_(rs)-EOF_1) significantly contributed to the total variances of each R_(rs) class.In addition,the correlation coefficients between the amplitude factors of class A-D R_(rs)-EOF_1 and the variances of the relevant water quality and optical parameters were better than those of the unclassified ones.The spectral shape of class AR_(rs)-EOF_1 was governed by the absorption characteristic of chlorophyll a and colored dissolved organic matter(CDOM).The spectral shape of class B R_(rs)-EOF_1 was governed by the absorption characteristic of CDOM since it exhibited a high correlation with the absorption coefficient of CDOM(a_g(λ)),whereas the spectral shape of class C R_(rs)-EOF_1 was governed by the back-scattering characteristics but not affected by the suspended matter.The spectral shape of class D R_(rs)-EOF_1 exhibited a relatively good correlation with all the water quality parameters,which played a significant role in deciding its spectral shape.
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| 关 键 词： | 南海西北部海域 遥感反射率 经验正交函数分析 水色控制因子 |
| 收稿时间： | 2019/8/30 0:00:00 |
Analysis of the regional spectral properties in northwestern South China Sea based on an empirical orthogonal function |
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| Fu Dongyang,Huang Yuye,Liu Dazhao,Liao Shan,Yu Guo,Zhang Xiaolong.Analysis of the regional spectral properties in northwestern South China Sea based on an empirical orthogonal function[J].Acta Oceanologica Sinica,2020,39(7):107-114. |
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| Authors: | Fu Dongyang Huang Yuye Liu Dazhao Liao Shan Yu Guo Zhang Xiaolong |
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| Institution: | 1.College of Electronic and Information Engineering, Guangdong Ocean University, Zhanjiang 524088, China2.State Key Laboratory of Tropical Oceanography, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, China3.University of Chinese Academy of Sciences, Beijing 100049, China |
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| Abstract: | This study presents an analysis of the spectral characteristics of remote sensing reflectance (Rrs) in northwestern South China Sea based on the in situ optical and water quality data for August 2018. Rrs was initially divided into four classes, classes A to D, using the max-classification algorithm, and the spectral properties of whole Rrs were characterized using the empirical orthogonal function (EOF) analysis. Subsequently, the dominant factors in each EOF mode were determined.The results indicated that more than 95% of the variances of Rrs are partly driven by the back-scattering characteristics of the suspended matter. The initial two EOF modes were well correlated with the total suspended matter and back–scattering coefficient. Furthermore, the first EOF modes of the four classes of Rrs (A–D Rrs–EOF1) significantly contributed to the total variances of each Rrs class. In addition, the correlation coefficients between the amplitude factors of class A–D Rrs–EOF1 and the variances of the relevant water quality and optical parameters were better than those of the unclassified ones. The spectral shape of class A Rrs–EOF1 was governed by the absorption characteristic of chlorophyll a and colored dissolved organic matter (CDOM). The spectral shape of class B Rrs–EOF1 was governed by the absorption characteristic of CDOM since it exhibited a high correlation with the absorption coefficient of CDOM (ag (λ)), whereas the spectral shape of class C Rrs–EOF1 was governed by the back-scattering characteristics but not affected by the suspended matter. The spectral shape of class D Rrs–EOF1 exhibited a relatively good correlation with all the water quality parameters, which played a significant role in deciding its spectral shape. |
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| Keywords: | northwestern South China Sea remote sensing reflectance empirical orthogonal function analysis ocean color control factors |
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