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热带海洋学报 ›› 2024, Vol. 43 ›› Issue (2): 1-11.doi: 10.11978/YG2023002CSTR: 32234.14.YG2023002

• 海洋调查与观测 •    下一篇

体散射函数及衰减系数快速剖面仪的研发及应用*

李彩1(), 刘聪1,2, 张现清1, 陈飞1, 肖志会3, 杨泽明1, 郑媛宁1,2, 周雯1, 许占堂1   

  1. 1.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), 广东 广州 510301
    2.中国科学院大学, 北京 100049
    3.中国科学院南海海洋研究所仪器中心, 广东 广州 510301
  • 收稿日期:2023-06-25 修回日期:2023-08-27 出版日期:2024-03-10 发布日期:2024-03-26
  • 作者简介:

    李彩(1977—), 女, 甘肃省白银市人, 研究员, 主要从事海洋光学技术的研究。email:

    *感谢中国科学院仪器设备功能开发技术创新项目的资助; 感谢中国科学院海南热带海洋生物实验站黄晖研究员、周伟华研究员和付兴胜助理工程师对本次研究数据的获取提供的支持和帮助; 感谢中国科学院海南热带海洋生物实验站组织的三亚湾生态环境调查冬季航次。

  • 基金资助:
    广州市南沙区重点领域科技项目(2022ZD001); 国家自然科学基金项目(41976181); 国家自然科学基金项目(41976172); 国家自然科学基金项目(41976170); 国家自然科学基金项目(42276181); 热带海洋环境国家重点实验室自主研究项目(LTOZZ2003); 国家重点研发计划课题项目(2022FY100601)

Development and Application of the Multiangle Volume Scattering and Attenuation Meter (VSAM)*

LI Cai1(), LIU Cong1,2, ZHANG Xianqing1, CHEN Fei1, XIAO Zhihui3, YANG Zeming1, ZHENG Yuanning1,2, ZHOU Wen1, XU Zhantang1   

  1. 1. State Key Laboratory of Tropical Oceanography (South China Sea Institute of Oceanology, Chinese Academy of Sciences), Guangzhou 510301, China
    2. University of Chinese Academy of Sciences, Beijing 100049, China
    3. Equipment Public Service Center (South China Sea Institute of Oceanology, Chinese Academy of Sciences), Guangzhou 510301, China
  • Received:2023-06-25 Revised:2023-08-27 Online:2024-03-10 Published:2024-03-26
  • Supported by:
    Science and Technology Planning Project of Guangzhou Nansha District Guangzhou City China(2022ZD001); National Natural Science Foundation of China(41976181); National Natural Science Foundation of China(41976172); National Natural Science Foundation of China(41976170); National Natural Science Foundation of China(42276181); Open Project Program of the State Key Laboratory of Tropical Oceanography(LTOZZ2003); National Key R&D Program of China(2022FY100601)

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摘要：

水体体散射函数(volume scattering function, VSF, β θ , λ)、吸收系数 a λ及衰减系数 c λ是海水固有光学特性的基础性参数, 基于上述参数可以进一步推算得到水体所有特征性光学特性参数, 进而为海洋初级生产力、全球碳循环等基础和前端领域研究以及水色遥感、水环境监测及灾害预警、水下光场分布、目标追踪、光伏发电等军民融合领域的应用和发展提供重要的数据支撑。受限于体散射函数的强方向性, 其测量技术难度大且发展不成熟。文章以高角度分辨率多角度体散射函数及衰减系数高频剖面测量为目标, 研发了可同步获取17个角度体散射函数、水体衰减系数、剖面深度及温度信息的快速剖面测量仪(volume scattering and attenuation meter, VSAM), 其测量频率最高可达20Hz, 体散射函数测量角度范围为10°~170°, 角度分辨率10°, 剖面最大工作深度200m。利用VSAM对三亚湾和崖州湾水体光学特性分布进行剖面调查研究: 整体上, 崖州湾和三亚湾水体体散射函数及衰减系数均存在较大的水平、垂直及角度(体散射函数)变化特征; 同一水层, 自西向东衰减及体散射函数呈递减趋势; 同一站位, 衰减及体散射函数随剖面深度呈递增趋势; 前向10°体散射函数最大, 后向120°体散射函数最小, 前后向体散射函数相差2个数量级甚至更高。结合同期获取的水体浊度和叶绿素浓度剖面调查结果发现, 浊度是崖州湾水体体散射函数及衰减系数显著高于三亚湾的主导贡献者, 且上述海域水体浊度与颗粒物散射 β p 90 ° , 650及衰减 c p 650具有很好的线性相关性。VSAM测得的衰减系数及后向体散射函数分别与Viper (Trios公司, 德国)及ECO-VSF3 (Seabird公司, 美国)测量结果在剖面分布上具有较好的一致性。

关键词: 体散射函数, 衰减系数, 剖面测量, 三亚湾, 崖州湾

Abstract:

The volume scattering function (VSF, β θ , λ), the absorption coefficient a λ, and attenuation coefficient c λ are the basic parameters of the inherent optical properties of seawater, based on the above parameters, all the inherent and apparent characteristic parameters of the seawater can be further deduced, and the important information data for the basic and front-end research on the primary productivity of the ocean and the global carbon cycle, as well as the military-civilian integration fields application such as the development of the water color remote sensing, the water environment monitoring and disaster early warning, the underwater light field distribution, target tracking, and the photovoltaic power generation will be supported. Limited by the strong directionality of VSF, its measurement technology is difficult and immature. In this paper, with the goal of high-frequency profile measurement of high-angle resolution multi-angle VSF and attenuation coefficient of seawater, a multiangle volume scattering function and attenuation coefficient meter (VSAM) that can simultaneously measure 17 angular VSFs, the attenuation coefficient, the profile depth and temperature information has been described, the measurement angle range of VSF is 10° ~ 170° with the interval of 10°, while the theoretical measurement frequency and deepest profile depth are 20 Hz and 200 m, respectively. With VSAM, the distribution of optical parameters of Sanya Bay and Yazhou Bay has been investigated and studied, and on the whole, the VSFs and attenuation coefficient of Yazhou Bay and Sanya Bay have large changes in horizontal, vertical and angle (for VSFs). The minimum and maximum of VSFs in 120° and 10°, respectively, and the maximum is two or more orders of magnitude larger than the minimum. The attenuation and VSFs show a decreasing trend from west (the Yazhou Bay) to east (the Sanya Bay) in the same water layer and an increasing trend from surface to underwater deeper in the profile at the same station. Combined with the results of water turbidity and chlorophyll concentration profile results measured during the same period, it is found that turbidity is the dominant contribution of the VSFs and attenuation coefficient of the Yazhou Bay, and it also has a good linear correlation with c p 650 and β p 90 ° , 650 in these two bays. The attenuation coefficients and VSFs measured by VSAM are in good agreement with the attenuation coefficient measured by Viper (www.trios.de) and the VSFs by ECO-VSF3 (www.seabird.com) in the same stations and water layer during the same period.

Key words: volume scattering function, attenuation coefficient, profile measurement, Sanya Bay, Yazhou Bay