High-resolution surface salinity maps in coastal oceans based on geostationary ocean color images: quantitative analysis of river plume dynamics
High-resolution surface salinity maps in coastal oceans based on geostationary ocean color images: quantitative analysis of river plume dynamics
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DOI：
10.1007/s10872-017-0459-4
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发表时间：
2018-06-01
影响因子：
2.3
通讯作者：
Nakajima, Masaki
中科院分区：
文献类型：
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作者：
Nakada, Satoshi;Kobayashi, Shiho;Nakajima, Masaki
沿海海洋的海面盐度（SSS）是河流羽流的直接指标，并提供有关海洋环境和生态系统的重要信息，影响沿海渔业、水产养殖和海洋收成。然而，要准确捕获沿海海洋的SSS模式，需要高的时间和空间分辨率。本文介绍了一种制作高分辨率（500米）SSS地图的方法，用于分析沿海海洋中的河流羽流，该地图基于地球静止海洋彩色成像仪每小时收集的发色性溶解有机物数据。位于濑户内海东部的大阪湾被选为试点地区。初始估计和校准SSS数据之间的比较表明，在通过自动观测系统收集的现场SSS数据的大盐度范围内（20-34），估计误差大幅降低，最高可达71%。基于SSS图计算盐度异常来识别羽流区域，我们评估了超级台风引起的大径流事件对河流羽流的影响。羽流在河口形成后，沿东南海岸向南延伸至海湾口。台风后的烟羽面积覆盖了海湾的一半，约为台风前的1.5倍。台风过后，低sss持续约两周。我们的方法可以实际用于分析沿海海洋中河流羽流的动力学，从而导致与业务海洋学相关的沿海海洋预测模型的发展。
Sea surface salinity (SSS) in coastal oceans is a direct indicator of riverine plumes and provides essential information about the ocean environment and ecosystem, which affects coastal fisheries, aquaculture, and marine harvests. However, to accurately capture SSS patterns in coastal oceans, high temporal and spatial resolutions are required. This paper introduces a methodology to produce high-resolution ( 500 m) SSS maps for analysis of river plumes in coastal oceans based on hourly chromophoric dissolved organic matter data collected by the Geostationary Ocean Color Imager. Osaka Bay, located in the eastern Seto Inland Sea, was selected as a pilot region. A comparison between the initial estimates and calibrated SSS data showed a substantial decrease in estimation error, by up to 71%, over a wide range of salinity (20-34) using in situ SSS data collected through an automated observation system. Calculating the salinity anomaly based on the SSS map to identify plume areas, we evaluated the impact of a large runoff event induced by a super typhoon on the river plumes. After the plume formed in the estuary, it extended southward to the bay mouth along the southeastern coast. The plume area during the post-typhoon period covered half of the bay, approximately 1.5 times the area during the pre-typhoon period. The post-typhoon, low-SSS period continued for approximately 2 weeks. Our approach can be of practical use for analyzing the dynamics of river plumes in coastal oceans, leading to the development of coastal ocean prediction models related to operational oceanography.