Diurnal Dynamics and Seasonal Variations of Total Suspended Particulate Matter in Highly Turbid Hangzhou Bay Waters Based on the Geostationary Ocean Color Imager
Diurnal Dynamics and Seasonal Variations of Total Suspended Particulate Matter in Highly Turbid Hangzhou Bay Waters Based on the Geostationary Ocean Color Imager
复制标题
基于对地静止海洋颜色成像仪的高浑浊杭州湾海域总悬浮颗粒物日动态及季节变化
DOI：
10.1109/jstars.2018.2830335
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发表时间：
2018
影响因子：
5.5
通讯作者：
Wang Yihao
中科院分区：
文献类型：
--
作者：
Liu Jia;Liu Jiahang;He Xianqiang;Pan Delu;Bai Yan;Zhu Feng;Chen Tieqiao;Wang Yihao
杭州湾总悬浮颗粒物（TSM）具有浓度高、日变化显著的特点，对水质具有重要影响。由于时空分辨率不足，巡航取样和极轨道卫星遥感都难以对沿海地区的此类物质进行天气学上的描绘。然而，地球静止海洋颜色成像仪（GOCI）是世界上第一个地球静止卫星海洋颜色传感器，现在可以每小时对目标区域进行观测。在这里，我们开发了一个经验的TSM检索算法的GOCI，光谱吸收指数（SAI）的基础上。此外，进行了大气校正算法和SAI TSM算法的验证，GOCI反演的归一化离水辐射亮度（Lwn）和TSM与原位值匹配良好。此外，昼夜动态对应的潮汐阶段，最大值为5000毫克/升，在中央HZB。TSM的季节变化还取决于淡水输入和泥沙负荷，相关系数分别为-0.77和0.84。冬季风速的增加增强了垂直混合，有利于沉积物向上层的再悬浮，因此TSM在冬季高于夏季。这些结果突出了利用地球同步水色遥感监测沿海沃茨短期和区域海洋现象的可行性。此外，这项研究有助于我们了解相关的沉积动力学和物理地球化学过程。
Characterized by high concentrations and significant diurnal dynamics, total suspended particulate matter (TSM) in Hangzhou Bay (HZB) can influence the water quality. Both cruise sampling and polar-orbiting satellite remote sensing make it difficult to synoptically delineate such matter in coastal regions due to insufficient spatiotemporal resolution. However, near-real-time monitoring from the Geostationary Ocean Color Imager (GOCI), the world's first geostationary satellite ocean color sensor, now allows hourly observations of target areas. Here, we developed an empirical TSM retrieval algorithm for the GOCI, based on the spectral absorption index (SAI). Additionally, validations of the atmospheric correction algorithm and SAI TSM algorithm were conducted, with the GOCI-retrieved normalized water-leaving radiance (Lwn) and TSM well-matched with in situ values. Moreover, the diurnal dynamics corresponded to tidal phases, with a maximum of 5000 mg/L in central HZB. The seasonal variations in TSM were also determined by freshwater inputs and sediment loads, with correlation coefficients of −0.77 and 0.84, respectively. The increased wind speed in winter enhanced vertical mixing and favored the resuspension of sediment to the upper layer, and therefore TSM was higher in winter than in summer. These results highlight the feasibility of using geostationary ocean color remote sensing to monitor short-term and regional oceanic phenomena in coastal waters. Furthermore, this study contributes to our understanding of related sediment dynamics and physical biogeochemical processes.