| 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。为探究它们的共同作用对东海浮游植物时空变化带来的多重影响，利用添加分源模块的物理-生态耦合模型分析了东海表层不同来源DIN支持的浮游植物（以叶绿素a浓度chlorophyll a，chl a表征）季节变化与空间分布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 a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 a，其余三种来源chl a季节变化均呈双峰结构。不同来源chl a空间分布特征存在季节变化差异，并且各来源chl a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: |
| 基金项目:天津市教委科研计划项目，2019KJ219号。 |
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| EFFECT OF DISSOLVED INORGANIC NITROGEN ON SEASONAL VARIATION OF SURFACE CHLOROPHYLL IN THE EAST CHINA SEA IN PHYSICAL-BIOLOGICAL COUPLING MODEL |
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XU Fan1,2, ZHANG Jing1,2, ZHAO Liang1,2
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1.College of Marine and Environmental Sciences, Tianjin University of Science and Technology, Tianjin 300457, China;2.Key Laboratory of Marine Resource Chemistry and Food Technology, Tianjin University of Science and Technology, Ministry of Education, Tianjin 300457, China
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| Abstract: |
| There are four main external sources of dissolved inorganic nitrogen (DIN) into the East China Sea, including the Kuroshio, Taiwan Strait, river runoff, and atmospheric deposition. In order to explore their combined effects on temporal and spatial variations of phytoplankton in the East China Sea, a physical-biological coupled model and tracking module were used to explore the roles of different sources of DIN in seasonal and spatial variations of surface phytoplankton characterized by chlorophyll a (chl a) and the corresponding relationship between DIN and chl a in the East China Sea. Of the four DIN sources of chl a concentration, the Kuroshio and river runoff are dominant contributors. On the other hand, except for the river runoff, seasonal variation of chl a from other three sources showed a bimodal structure. Different-sourced DIN and the supported chl a displayed distinct seasonal variations and characteristic spatial distribution. chl a supported by different sourced DIN occupied different dominant regions of the East China Sea shelf due 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 dissolved inorganic nitrogen (DIN) multi-sourced nutrient seasonal variation the East China Sea |
