长江口及邻近东海水团相互作用介导的氮循环与生态影响:来自氮氧同位素的启示

IF 2.2 3区 地球科学 Q2 OCEANOGRAPHY
Ziying Zhou , Zhi Yang , Bin Wang , Haiyan Jin , Lihua Ran , Zhibing Jiang , Qianna Chen , Feng Zhou , Hao Zheng , Jianfang Chen
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引用次数: 0

摘要

长江口复杂的水动力条件对营养物的分布、运输和转化起着关键作用,从而影响该地区浮游植物的生长和生态系统的稳定。本研究基于2023年8月中旬在长江口及邻近东海海域进行的水文、生物和化学调查数据,结合硝酸盐氮(δ15NNO3)和氧同位素(δ18ONO3)示踪技术,探讨了水团辐合过程中物理-生物地球化学过程的协同效应。研究结果表明,通过长江稀释水(CDW)输送的高浓度陆源硝酸盐是浮游植物快速生长的主要无机氮源。黄海沿岸流(YSCC)和台湾暖流(TWC)通过混合和辐合过程调节营养物的输送和再分配。TWC的高磷输入优化了区域营养结构,缓解了CDW过量氮输入造成的磷限制。然而,低氧YSCC水体的侵入可能会加剧底水缺氧。由CDW、YSCC和TWC辐合引起的锋面系统和水柱分层控制了氮磷养分的空间分布,塑造了浮游植物的分布格局,促进了局部高产带的形成。在水体相互作用的驱动下,物理过程和生物地球化学过程的协同作用显著降低了底水溶解氧浓度,从而增加了局部缺氧的风险,威胁区域生态系统的稳定。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Nitrogen cycling and ecological impacts mediated by water mass interactions in the Yangtze river estuary and the adjacent east China Sea: insights from nitrogen and oxygen isotopes
The complex hydrodynamic conditions in the Yangtze River Estuary play a pivotal role in shaping the distribution, transport, and transformation of nutrients, thereby influencing phytoplankton growth and ecosystem stability in the region. This study, based on hydrographic, biological, and chemical data collected during a mid-August 2023 cruise survey in the Yangtze River Estuary and the adjacent East China Sea, integrates nitrate nitrogen (δ15NNO3) and oxygen isotope (δ18ONO3) tracing techniques to investigate the synergistic effects of physical-biogeochemical processes during water mass convergence. The findings reveal that high concentrations of terrestrial nitrate, transported by the Changjiang Diluted Water (CDW), serve as the primary inorganic nitrogen source, driving rapid phytoplankton growth. Meanwhile, the Yellow Sea Coastal Current (YSCC) and Taiwan Warm Current (TWC) regulate nutrient transport and redistribution through mixing and convergence processes. The high phosphate input from the TWC optimizes the regional nutrient structure, alleviating phosphorus limitation caused by excessive nitrogen input from the CDW. However, the intrusion of low-oxygen YSCC waters may worsen bottom-water hypoxia. The frontal systems and water column stratification, induced by the convergence of CDW, YSCC, and TWC, control the spatial distribution of nitrogen and phosphorus nutrients, shape phytoplankton distribution patterns, and foster the formation of localized high-productivity zones. The synergistic effects of physical and biogeochemical processes, driven by water mass interactions, can significantly reduce bottom-water dissolved oxygen concentrations, thereby increasing the risk of localized hypoxia and threatening regional ecosystem stability.
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来源期刊
Continental Shelf Research
Continental Shelf Research 地学-海洋学
CiteScore
4.30
自引率
4.30%
发文量
136
审稿时长
6.1 months
期刊介绍: Continental Shelf Research publishes articles dealing with the biological, chemical, geological and physical oceanography of the shallow marine environment, from coastal and estuarine waters out to the shelf break. The continental shelf is a critical environment within the land-ocean continuum, and many processes, functions and problems in the continental shelf are driven by terrestrial inputs transported through the rivers and estuaries to the coastal and continental shelf areas. Manuscripts that deal with these topics must make a clear link to the continental shelf. Examples of research areas include: Physical sedimentology and geomorphology Geochemistry of the coastal ocean (inorganic and organic) Marine environment and anthropogenic effects Interaction of physical dynamics with natural and manmade shoreline features Benthic, phytoplankton and zooplankton ecology Coastal water and sediment quality, and ecosystem health Benthic-pelagic coupling (physical and biogeochemical) Interactions between physical dynamics (waves, currents, mixing, etc.) and biogeochemical cycles Estuarine, coastal and shelf sea modelling and process studies.
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