基于GOCI的长江口及附近海域主要营养盐的分布与日内变化研究-海洋预报

基于GOCI的长江口及附近海域主要营养盐的分布与日内变化研究

单位：1. 上海海洋大学海洋科学学院, 上海 201306;
2. 农业农村部大洋渔业开发重点实验室, 上海 201306;
3. 大洋渔业资源可持续开发教育部重点实验室, 上海 201306;
4. 上海市河口海洋测绘工程技术研究中心, 上海 201306;
5. 上海海洋大学海洋生态与环境学院, 上海 2

关键词：GOCI 长江口营养盐反演模型日内变化

分类号：X145

出版年·卷·期（页码）：2022·39·第二期（1-13）

摘要：

对表层水体硝酸盐、磷酸盐和硅酸盐浓度之间的相关性进行分析，利用GOCI影像与实测表层水体的营养盐浓度（包括磷酸盐和硅酸盐）建立长江口及附近海域的表层水体营养盐遥感反演模型，并利用实测数据和营养盐之间的相关关系对反演模型进行验证。验证结果表明：磷酸盐和硅酸盐反演模型的平均绝对百分比误差分别是21.65%和6.73%。将建立的营养盐反演模型应用于GOCI影像进行表层水体营养盐日内变化的研究，结果显示：整个长江口及附近海域表层水体磷酸盐和硅酸盐浓度的分布呈现出由近岸向外海递减的趋势，且在苏北浅滩、长江口及杭州湾出现明显的高值区；长江口及附近海域表层磷酸盐和硅酸盐浓度日变化明显，其中杭州湾和长江口外南部营养盐受潮汐影响显著，即在涨潮时表层水体营养盐浓度降低，在落潮时浓度升高，长江口外北部海域营养盐浓度波动较大。

fIn this paper, the correlation between nitrate, phosphate and silicate concentrations in the surface water is firstly analyzed, and then the remote sensing inversion models of nutrients in the surface layer of the Yangtze River Estuary and its adjacent waters is established by using GOCI images and in-situ nutrient concentrations (including phosphate and silicate). The inversion models are verified by using the in-situ data and the correlation between the in-situ nutrients. The verification results show that the mean absolute percentage errors of the phosphate and silicate inversion models are 21.65% and 6.73%, respectively. Then the established nutrient inversion models are applied to GOCI images to study the diurnal variations of nutrients in the surface water. The results demonstrate that the distribution of phosphate and silicate concentrations in the surface waters of the Yangtze River Estuary and its adjacent waters show a decreasing trend from the nearshore to the offshore. In addition, obvious high-value areas locate in the Subei shoals, the Yangtze River Estuary and Hangzhou Bay. The diurnal variations of phosphate and silicate concentrations is significant in the surface layer of the Yangtze River Estuary and its adjacent waters. The nutrients are significantly affected by tides in the Hangzhou Bay and the southern part of the Yangtze River Estuary. The nutrient concentration in surface water decreases at high tide and increases at low tide. The nutrient concentration in the north off the Yangtze River Estuary fluctuates greatly.

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