| 摘要: |
| 东海溶解无机氮(dissolved inorganic nitrogen, DIN)有四个主要外部来源，包括黑潮、台湾海峡、河流径流和大气沉降，它们的共同作用为东海浮游植物季节变化及空间分布带来了复杂的多重影响。利用添加分源模块的物理-生态耦合模型，分析东海表层不同来源DIN支持的浮游植物（以叶绿素a浓度Chlorophyll a，Chl表征）时空变化以及它们之间的响应关系，从而评估多源营养盐对东海陆架表层浮游植物的影响。各来源DIN支持的Chl浓度中，黑潮来源和河流径流来源先后占据主导地位，且除了河流径流来源Chl，其余三种来源Chl季节变化均呈双峰结构。不同来源Chl空间分布特征存在季节变化差异，并且各来源Chl在东海陆架不同季节存在不同的主导区域，这与不同来源DIN供给的物理过程，如环流、混合、层化以及温度变化等密切相关。研究不同来源营养盐对东海浮游植物的影响对理解多重压力下东海生态系统变化有重要意义。 |
| 关键词: 叶绿素a浓度 溶解无机氮 多源营养盐 季节变化 东海 |
| DOI：10.11693/hyhz20220500120 |
| 分类号:P731.2 |
| 基金项目:天津市教委科研计划项目, 2019KJ219号 |
附件 |
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| Exploring the effect of dissolved inorganic nitrogen on the seasonal variations of surface chlorophyll in the East China Sea using physical-biological coupled model and tracking module |
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xufan, zhangjing, zhaoliang
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Tianjin University of Science and Technology
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| Abstract: |
| There are four main external sources of dissolved inorganic nitrogen (DIN) in the East China Sea, including the Kuroshio, Taiwan Strait, river runoff, and atmospheric deposition. Their combined effects have brought complex impacts on the seasonal variations and spatial distributions of phytoplankton in the East China Sea. Using physical-biological coupled model and tracking module to analyze the effect of different sources of DIN on the temporal and spatial variations of phytoplankton (characterized by chlorophyll a, Chl) and the response relationship between DIN and Chl from various sources in the surface of the East China Sea, so as to evaluate the effects of multi-source nutrients on the surface phytoplankton over the East China Sea shelf. Among the Chl concentrations supported by DIN from different sources, the Kuroshio source and the river runoff source have dominated successively, and except for the river runoff source Chl, the seasonal variation of Chl from the other three sources has a bimodal structure. Different sources of DIN and their supported Chl have distinct seasonal variations and spatial distribution characteristics. Chl supported by different sources of DIN has different dominant regions on the East China Sea shelf, which is related to different DIN supplement processes such as circulation, mixing, stratification and temperature variations. Studying the effects of nutrients from different sources on phytoplankton in the East China Sea is of great significance for understanding the changes of the East China Sea ecosystem under multiple pressures. |
| Key words: chlorophyll a DIN multi-source nutrients seasonal variation the East China Sea |