黄海、东海二类水体漫衰减系数与透明度反演模式研究

王晓梅; 唐军武; 丁静; 马超飞; 李铜基; 汪小勇; 毕大勇

黄海、东海二类水体漫衰减系数与透明度反演模式研究

1.
国家卫星海洋应用中心, 北京 100081
2.
国家海洋技术中心, 天津 300111

基金项目: HY-1卫星地面应用系统资助项目;"863"模块化二类水体相关遥感信息提取技术资助项目;国家卫星海洋应用中心主任青年科技基金资助项目;"863"计划课题资助项目(2002AA639160).

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出版历程
- 收稿日期: 2005-03-07
- 修回日期: 2005-04-20

The retrieval algorithms of diffuse attenuation and transparency for the Case-Ⅱ waters of the Huanghai Sea and the East China Sea

1.
National Satellite Ocean Application Service, State Oceanic Administration, Beijing 100081, China
2.
National Ocean Technology Center, State Oceanic Administration, Tianjin 300111, China

摘要

摘要: 黄海、东海是典型的二类水体区域,总悬浮物含量高,水体光学特性复杂.利用2003年春秋季黄海、东海水色联合试验中获取的高质量现场实测数据,建立了由遥感反射比反演水体在490nm波段的漫衰减系数和海水透明度的统计反演模式.这两种模式皆采用490,555,670nm三个波段的组合,漫衰减系数的反演值和实测值的相关系数为0.96,平均相对误差为17.2%;透明度的反演值与实测值的相关系数为0.95,平均相对误差为16.8%.对两种反演模式对遥感反射比输入误差的敏感性进行了分析,结果表明反演模式对±5%的遥感反射比输入误差导致490nm波段的漫衰减系数反演误差最大为27.3%,透明度最大误差为22.7%,并利用2003年春秋季同一海区的实测数据对模型进行了检验,漫衰减系数的平均相对误差为25.0%,透明度的为16.5%.给出了412,443,510,520,555,565nm各波段的漫衰减系数同波段490nm的漫衰减系数之间的关系,结果表明,在400~600nm波段中的每一个波段的漫衰减系数与490nm波段的漫衰减系数的相关性较高,相关系数都超过了0.98.这样利用建立的各波段漫衰减系数关系模型可以从一个已知波段的漫衰减系数反演出其他任何波段的漫衰减系数,这就在水色反演和应用中大大减少了未知因子的个数.
- 水色算法 /
- 二类水体水色算法 /
- 漫衰减系数 /
- 透明度 /
- 统计反演模式
Abstract: The Huanghai Sea and the East China Sea are typical coastal Case-Ⅱ water with high sediment load and complicated optical properties.On the basis of the data of 2003 joint ocean color cruises,the statistic algorithms to retrieve 490 nm band diffuse attenuation coefficient(K_d490) and Secchi depth transparency are established.The remote sensing reflectance at bands of 490,555 and 670 nm is used in the algorithms.The correlation coefficients(R²) of retrieved and in situ values are 0.96 with a averaged relative error of 17.2% for the K_d490,and 0.95 with 16.8% for transparency respectively.The input error sensitivity analysis shows that the introducing ±5% remote sensing reflectance error results in 27.3% and 22.7% error increase in the retrieval results.The algorithms are established based on one cruise and validated with data from the other cruise,it is shown that the average relative errors are 25.0% and 16.5% for K_d490 and transparency respectively.The relations of K_d490 to other ocean color wavelengths are also given in linear equations,and all the correlation coef ficients are above 0.98.From this result,the diffuse at tenuation coefficient at anyother bands can be derived by a known diffuse attenuation coefficient,so that the unknowns in ocean color models and applications are reduced.
- ocean color /
- Case-Ⅱ water algorithms /
- diffuse attenuation coefficient /
- Secchi depth transparency /
- statistic model

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