Abstract Groundwater discharge represents a potentially important source of dissolved nutrients to the coastal ocean. The barrier complex along the coast of southern Brazil separates the Patos Lagoon (PL) from the South Atlantic Ocean and supports the formation of the adjacent surficial aquifers which are connected to both water bodies. Due to the high hydraulic head of the PL regarding the ocean, groundwater flows toward the coastal waters. In this study fresh groundwater nutrient fluxes to the coastal ocean were estimated considering high and low PL water level scenarios. The groundwater fluxes were estimated applying Darcy's Law and the result was 0.043 m3 km−1 day−1. Different low and high PL water level scenarios showed a change in the nutrient availability along barrier. In the lowest PL water level scenario, the nutrient flux concentrations became more significant, which may have had an increase of approximately 25%. In the highest PL water level scenario, concentrations had a decrease of up to 78%. In the molar ratio (106C: 16 N: 1P), P resulted as a potentially limiting nutrient, providing a high primary productive potential to the environment (2735 gC m−2 y−1).

中文翻译：

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沿海泻湖水位对巴西南部沿海地区地下水养分通量的影响

摘要 地下水排放是沿海海洋溶解养分的潜在重要来源。沿巴西南部海岸的屏障复合体将帕托斯泻湖 (PL) 与南大西洋隔开，并支持形成与两个水体相连的相邻表层含水层。由于 PL 对海洋的高水头，地下水流向沿海水域。在这项研究中，考虑到高和低 PL 水位情景，估算了流入沿海海洋的淡水地下水养分通量。应用达西定律估算地下水通量，结果为 0.043 m3 km-1 day-1。不同的低和高 PL 水位情景显示沿屏障的养分有效性发生了变化。在最低 PL 水位情况下，养分通量浓度变得更加显着，可能增加了约 25%。在最高 PL 水位情景中，浓度下降了 78%。在摩尔比 (106C: 16 N: 1P) 中，P 作为一种潜在的限制性营养物质，为环境提供了很高的初级生产潜力 (2735 gC m-2 y-1)。