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首页> 外文期刊>Journal of marine systems: journal of the European Association of Marine Sciences and Techniques >Influence of continental shelf processes in the water mass balance and productivity from stable isotope data on the Southeastern Brazilian coast
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Influence of continental shelf processes in the water mass balance and productivity from stable isotope data on the Southeastern Brazilian coast

机译：来自巴西东南沿海稳定同位素数据的大陆架过程对水量平衡和生产率的影响

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摘要

Stable isotopic composition (delta O-18 and delta D of water, delta C-13(DIC)) of the water column in the open ocean is related to the origin of water masses. Due to the recent increase of paleoceanographic studies on continental shelves, it is also important to understand their distribution and variability in those systems. To examine the influence of continental shelves internal processes on isotopic composition of water masses, we present data of stable isotopes and phosphate content from a western boundary upwelling system located on the Southeastern Brazilian coast and compare them with offshore observations. High mixing of the main water masses (SSW, TW and SACW) was observed in the majority of the samples collected during different seasons in 2011 and 2012. A mixing triangle approach was used to separate the water masses contribution and characterize their isotopic composition. In addition, an isotopic three end-member model was established, proposing it as a paleoceanographic tool to reconstruct relative contribution of these water masses in sediment records. Variations of delta O-18 values are linked to oceanographic dynamics, mixing, continental runoff and upwelling processes on the shelf. Differently the delta C-13(DIC) variations in the middle and inner parts of the shelf are related to the productivity of the upwelling system. Seasonal variability of the delta C-13(DIC) values may be also related to changes in the upwelling intensity. (C) 2014 Elsevier B.V. All rights reserved.
机译：公海中水柱的稳定同位素组成（水的δO-18和δD，δC-13（DIC））与水团的起源有关。由于近来大陆架古海洋学研究的增加，了解它们在这些系统中的分布和变化也很重要。为了检查大陆架内部过程对水团同位素组成的影响，我们提供了来自巴西东南沿海西部边界上升系统的稳定同位素和磷酸盐含量的数据，并将其与近海观测资料进行了比较。在2011年和2012年不同季节收集的大多数样本中，都观察到主要水团（SSW，TW和SACW）的高度混合。使用混合三角方法来分离水团的贡献并表征其同位素组成。此外，建立了一个同位素三端元模型，将其作为古海洋学工具来重建这些水团在泥沙记录中的相对贡献。三角洲O-18值的变化与海洋动力学，混合，大陆径流和陆架上升过程有关。架子中部和内部的δC-13（DIC）变化与上升流系统的生产率有关。 δC-13（DIC）值的季节性变化也可能与上升流强度的变化有关。 （C）2014 Elsevier B.V.保留所有权利。

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