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首页> 外文期刊>Estuarine Coastal and Shelf Science >Extent of Mississippi River water in the Mississippi Bight and Louisiana Shelf based on water isotopes
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Extent of Mississippi River water in the Mississippi Bight and Louisiana Shelf based on water isotopes

机译：基于水同位素的密西西比河水密西西比河水的程度

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摘要

The northern Gulf of Mexico is a complex and very productive coastal river-dominated system that receives freshwater from numerous rivers including the Mississippi River. The dynamics of coastal ecosystems in the northern Gulf of Mexico are greatly influenced by the freshwater discharge but also by the high nutrient loads carried by the Mississippi River that lead to the seasonal development of one of the largest coastal hypoxic areas. Constraining the origin and fate of the freshwater inputs in the northern Gulf of Mexico will help increase understanding the physical and biogeochemical processes occurring in this region. Here, we focus on investigating the extent of the Mississippi River plume on both sides of the Mississippi River Delta: to the east in the Mississippi Bight, and to the west over the Louisiana Shelf. We determined the water isotopic signature (delta O-18 and delta D) along with salinity of the different river plumes and performed a river mixing model on the coastal waters. Our findings provide useful information to better understand the functioning of the northern Gulf of Mexico ecosystem. In particular, the development of hypoxia is often attributed to the nutrient load of the Mississippi River, yet the Mississippi River seemed to have a limited influence on the Mississippi Bight. That is, the dominant source of freshwater in the Bight was supplied by local Mississippi/Alabama rivers. Furthermore, the water isotope mixing model showed that the source of freshwater to the Louisiana Shelf was dominated by the Atchafalaya River in summer, and by the Mississippi River during non-summer seasons. This pattern is consistent with the general shelf circulation that reverses in summer, but could not have been shown solely by the use of salinity.
机译：墨西哥北部湾是一个复杂而非常有需生产的沿海河道主导的系统，从包括密西西比河的众多河流接受淡水。墨西哥湾北部沿海生态系统的动态受到淡水排放的大大影响，也受到密西西比河携带的高营养负荷，这导致了最大的沿海缺氧地区之一的季节性发展。约束墨西哥湾北部淡水投入的起源和命运将有助于增加理解该地区发生的物理和生物地球化学过程。在这里，我们专注于调查密西西比河三角洲两侧的密西西比河羽毛的范围：在密西西比奇的东部，到了路易斯安那州的西部。我们确定水同位素签名（Delta O-18和Delta d）以及不同河流羽毛的盐度，并在沿海水域进行了河流混合模型。我们的调查结果提供了有用的信息，以更好地了解墨西哥北湾生态系统的运作。特别是，缺氧的发展往往归因于密西西比河的营养负荷，但密西西比河似乎对密西西比的偏见有有利影响。也就是说，最喜欢的淡水中淡水的主导来源由当地的密西西比/阿拉巴马河流提供。此外，水同位素混合模型表明，淡水到路易斯安那架子的源泉在夏天的阿特希非亚河上占主导地位，并在非夏季季节的密西西比河。这种模式与夏季逆转的一般货架循环一致，但不能仅通过使用盐度来显示。

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