吴林妮, 韦钦胜, 辛明, 等, 2023. 春季东海营养盐的空间分布格局和控制机制[J]. 海洋科学进展, 41(4): 622-636. doi: 10.12362/j.issn.1671-6647.20230818001.
引用本文: 吴林妮, 韦钦胜, 辛明, 等, 2023. 春季东海营养盐的空间分布格局和控制机制[J]. 海洋科学进展, 41(4): 622-636. doi: 10.12362/j.issn.1671-6647.20230818001.
WU L N, WEI Q S, XIN M, et al, 2023. Spatial distribution patterns of nutrients and controlling mechanisms in the East China Sea during spring[J]. Advances in Marine Science, 41(4): 622-636. doi: 10.12362/j.issn.1671-6647.20230818001
Citation: WU L N, WEI Q S, XIN M, et al, 2023. Spatial distribution patterns of nutrients and controlling mechanisms in the East China Sea during spring[J]. Advances in Marine Science, 41(4): 622-636. doi: 10.12362/j.issn.1671-6647.20230818001

春季东海营养盐的空间分布格局和控制机制

Spatial Distribution Patterns of Nutrients and Controlling Mechanisms in the East China Sea During Spring

  • 摘要: 基于2017年5月所获取的温度、盐度、营养盐和叶绿素a(Chl a)等调查资料,本文从多学科交叉的视角分析了春季东海营养盐的空间分布格局及其与水文动力状况的关系,探讨了黑潮次表层水涌升和跨陆架输运对营养盐与Chl a分布的影响。结果表明:浙江近海和调查海域东北部为2个营养盐高值区,且浙江近海的Chl a质量浓度较高;调查海域东南部上层总体具有低营养盐、低Chl a的特征,而该海域底层水体中的磷酸盐(PO4-P)浓度较高。调查海域的水团格局对营养盐浓度和分布具有重要的调控作用,其中浙闽沿岸水和黄海沿岸流的南下输运对应形成了2个营养盐高值区;受黑潮次表层水入侵的影响,调查海域东南部底层呈现出高PO4-P的特征。春季黑潮次表层水由台湾东北部向东海陆架的入侵和涌升不仅显著影响了研究海域的温、盐度场和流场格局,同时也是实现营养盐跨陆架输运的重要通道和途径。受浙闽沿岸水和黑潮次表层水对营养盐输运的影响,在杭州湾东南—浙江近海对应形成了Chl a高值区;富PO4-P且具有适宜N/P值的黑潮次表层水向陆架入侵所形成的上升流对维持近海的初级生产具有潜在的重要作用。本研究揭示了春季东海营养盐的空间分布格局及其与相关水文、生态过程的关系,为阐释该海域营养盐的控制机制和生态影响等提供了科学依据。

     

    Abstract: Based on multidisciplinary data of temperature, salinity, nutrient and chlorophyll a (Chl a) in the East China Sea (ECS) during May 2017, this paper analyzed the spatial patterns of nutrients and relations to hydrodynamics, discussing the influences of Kuroshio Subsurface Water (KSSW) related-upwelling and cross-shelf transport on the distributions of nutrients and Chl a. The results show that two high-nutrient regions existed off Zhejiang coast and in the northeastern ECS. Moreover, Chl a was maintained at a high level off Zhejiang coast. The upper-layer waters in the southeastern ECS were characterized by low nutrient and low Chl a, while the bottom waters in this area exhibited high phosphate (PO4-P) concentrations. The water mass structure largely regulated the concentrations and distributions of nutrients in the ECS. The Zhe-Min Coastal Water and the southward Yellow Sea Coastal Current corresponded to the two high-nutrient regions. Influenced by the KSSW intrusion, the bottom waters in the southeastern ECS showed high PO4-P concentrations. The intrusion and upwelling of KSSW from northeast Taiwan to the ECS shelf not only significantly affected the temperature, salinity andcurrent patterns in the studied area, but also was an important channel or pathway for the cross-shelf transport of nutrients. The nutrient transport associated with the Zhe-Min Coastal Water and KSSW contributed to high Chl a from the southeastern region off Hangzhou Bay to Zhejiang coast. The upwelling of KSSW with an appropriate N/P ratio and rich PO4-P played a potentially important role in maintaining the primary production in nearshore region. Overall, this study revealed the spatial patterns of nutrients and relationships with hydrological and ecological processes in the ECS during spring, laying a foundation for unraveling controlling mechanisms and ecological effects of nutrients in this marginal sea.

     

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