Spatial and temporal variation of nutrient distribution in the Yangtze River estuary and adjacent waters: Insights from GOCI data analysis

IF 3.2 3区环境科学与生态学 Q2 ENVIRONMENTAL SCIENCES Marine environmental research Pub Date : 2025-02-01 DOI:10.1016/j.marenvres.2024.106895

Chaozhi Yu , Cancan Lu , Yangdong Li , Hongli Li , Jun Lin , Liang Chang

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Abstract

Nutrients are critical in assessing water quality, so understanding their distribution and variability is essential for effective marine environmental protection. This study focuses on the Yangtze River estuary and surrounding waters, where suspended solids show a strong correlation with active phosphates and silicates. Using GOCI imagery and measured nutrient concentrations, such as active phosphate and silicate, remote sensing models were developed to investigate the seasonal and daily changes in surface water nutrients. The results showed the following key findings: Temporally, active phosphate (PO₄-P) and silicate (SiO₃-Si) concentrations exhibited distinct seasonal patterns, with the highest values observed in winter (1.692 μmol/L and 16.386 μmol/L, respectively) and the lowest in summer (0.503 μmol/L and 10.645 μmol/L, respectively). Little difference was found between spring and autumn. Spatially, elevated phosphate and silicate concentrations were found near the northern Jiangsu Shoal, the Yangtze River estuary, and Hangzhou Bay, and decreased towards the outer coastal waters. This suggests that the freshwater inflow from the Yangtze River is an important driver of the observed nutrient patterns. Diurnal variations in phosphate and silicate concentrations were observed in the surface waters of the Yangtze River estuary and adjacent areas. Significant diurnal variations in nutrient concentrations were observed in Hangzhou Bay, the northern part of the Yangtze River estuary and the southern part of the Yangtze River estuary. Slight diurnal variations were observed in the inland channels of the estuary. These results help to facilitate the study of the complex process of spatial and temporal dynamics of nutrients in the coastal waters of eastern China.

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长江口及邻近海域养分分布的时空变化——来自GOCI数据分析的启示

营养物质对评估水质至关重要，因此了解它们的分布和变化对有效保护海洋环境至关重要。本研究以长江口及周边海域为研究对象，研究区悬浮物与活性磷酸盐和硅酸盐具有很强的相关性。利用GOCI图像和测量的营养物质浓度（如活性磷酸盐和硅酸盐），开发了遥感模型来研究地表水营养物质的季节和日变化。结果表明：在时间上，活性磷酸盐（PO4-P）和硅酸盐（SiO3-Si）浓度具有明显的季节特征，冬季最高（分别为1.692和16.386 μmol/L），夏季最低（分别为0.503和10.645 μmol/L）；春季和秋季的差异不大。从空间上看，在苏北浅滩、长江口和杭州湾附近，磷、硅酸盐浓度呈上升趋势，向近海方向呈下降趋势；这表明，长江淡水流入是观测到的营养格局的重要驱动因素。研究了长江口及邻近海域表层水体磷、硅酸盐浓度的日变化规律。杭州湾、长江口北部和长江口南部的营养物浓度日变化显著。入海口内河河道日变化不大。这些结果有助于研究中国东部沿海水域养分时空动态的复杂过程。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Marine environmental research 环境科学-毒理学

CiteScore

5.90

自引率

3.00%

发文量

217

审稿时长

46 days

期刊介绍： Marine Environmental Research publishes original research papers on chemical, physical, and biological interactions in the oceans and coastal waters. The journal serves as a forum for new information on biology, chemistry, and toxicology and syntheses that advance understanding of marine environmental processes. Submission of multidisciplinary studies is encouraged. Studies that utilize experimental approaches to clarify the roles of anthropogenic and natural causes of changes in marine ecosystems are especially welcome, as are those studies that represent new developments of a theoretical or conceptual aspect of marine science. All papers published in this journal are reviewed by qualified peers prior to acceptance and publication. Examples of topics considered to be appropriate for the journal include, but are not limited to, the following: – The extent, persistence, and consequences of change and the recovery from such change in natural marine systems – The biochemical, physiological, and ecological consequences of contaminants to marine organisms and ecosystems – The biogeochemistry of naturally occurring and anthropogenic substances – Models that describe and predict the above processes – Monitoring studies, to the extent that their results provide new information on functional processes – Methodological papers describing improved quantitative techniques for the marine sciences.