Abstract The bathymetry in the region of the Tubarao Bight is complex. When associated with the morphological variations in the continental shelf and the presence of the Vitoria-Trindade Chain, peculiar physical characteristics capable of modifying the hydrodynamic flow and the distribution of water masses on the continental shelf appear. Moreover, the presence of cyclonic eddies and the upwelling process reinforce the importance of this region from a physical and biological perspective, especially related to the input of nutrients to the euphotic zone. This study aimed to analyze the spatial distribution of nutrients and its relationship with water masses (Coastal Water (CW), Tropical Water (TW), South Atlantic Central Water (SACW), Antarctic Intermediate Water (AAIW), and Upper Circumpolar Deep Water (UCDW)). The spatial distribution of nutrients was calculated via extended optimum multiparameter analysis using conservative (temperature and salinity) and nonconservative (dissolved oxygen (O2), nitrate (NO3−), silicate (SiO2), and phosphate (PO43−)) parameters. In this region, the presence and distribution of water masses are conditioned by the dynamics and variability associated with continental discharge, the Brazil Current, and local hydrodynamics. The spatial-temporal distribution of nutrient concentrations was strongly related to the distribution of water masses and the processes related to regeneration, coastal upwelling, erosion of the upper thermocline, and cyclonic eddy presence. As a result, on the continental shelf, the highest concentrations of SiO2 and dissolved O2 occurred in the water column portion occupied by CW and TW, whereas NO3− was associated with SACW. Offshore, the highest nutrient concentrations (SiO2, NO3−, and PO43−) were related to intermediate water masses (AAIW and UCDW). Furthermore, the highest concentrations of dissolved O2 were associated with TW and AAIW as a result of ocean-atmosphere interactions and formation processes.

中文翻译：

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巴西图巴朗湾 (20°s – 22°s) 中与水团相关的营养物质的空间分布

摘要 图巴劳湾地区的水深测量是复杂的。当与大陆架的形态变化和维多利亚-特林达德链的存在相关联时，会出现能够改变大陆架上的水动力流动和水团分布的特殊物理特征。此外，气旋涡旋的存在和上升流过程从物理和生物学的角度加强了该区域的重要性，尤其是与向透光区输入营养物质有关的重要性。本研究旨在分析养分的空间分布及其与水团（沿海水（CW）、热带水（TW）、南大西洋中部水（SACW）、南极中水（AAIW）和上环极深水）的关系。 UCDW))。使用保守（温度和盐度）和非保守（溶解氧 (O2)、硝酸盐 (NO3−)、硅酸盐 (SiO2) 和磷酸盐 (PO43−)）参数，通过扩展的最佳多参数分析计算养分的空间分布。在该地区，水团的存在和分布受与大陆流量、巴西洋流和当地流体动力学相关的动力学和可变性的制约。养分浓度的时空分布与水团的分布以及与再生、沿海上升流、上温跃层侵蚀和气旋涡流存在相关的过程密切相关。因此，在大陆架上，SiO2 和溶解 O2 的浓度最高出现在 CW 和 TW 占据的水柱部分，而 NO3− 与 SACW 相关。在海上，最高的养分浓度（SiO2、NO3- 和 PO43-）与中间水团（AAIW 和 UCDW）有关。此外，由于海洋-大气相互作用和形成过程，溶解氧的最高浓度与 TW 和 AAIW 相关。