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Investigating the Horizontal Distribution of Hydrographic Properties of the Texas-Louisiana Shelf Using an Undulating Towed Vehicle

机译:使用起伏的牵引车研究德克萨斯州路易斯安那州架子的水文特性的水平分布

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摘要

Observations of salinity, dissolved oxygen (DO), chlorophyll-a, and CDOM fluorescence were collected using an Acrobat (Sea Sciences Inc.) undulating towed vehicle during an oceanographic survey in June 2012. These observations were analyzed to investigate the horizontal and vertical spatial variability and examine the relationship of physical and biological factors with the distribution of dissolved oxygen concentration. Equipped with a CTD and multiple sensors, the instrument package produced high spatial resolution (~200 m) vertical sections along 16 cross-shelf lines that were distributed along the Texas-Louisiana Shelf from Matagorda Bay, Texas to the Mississippi River Delta at Southwest Pass, Louisiana. Characteristics associated with the freshwater plume of the Mississippi River are confined to small areas of the eastern shelf, which led to a discernible east-to-west gradient between the analyzed properties. As a result of strong salinity-based stratification, the east-shelf contained low surface salinity, near-bottom hypoxia, and maximum chlorophyll-a and CDOM fluorescence values above the halocline. Contrary to this, the west-shelf was characterized by weak stratification, no near-bottom hypoxia, and maximum chlorophyll-a and fluorescence values beneath the main halocline and near the ocean floor. If it is not monitored and remediated, hypoxia can bring about detrimental impacts on aquatic life and can lead to distressing impacts on the ecosystem. This research comprises a portion of the Mechanisms Controlling Hypoxia Project, funded by NOAA since 2003, whose objective is to characterize the principal physical drivers of hypoxia in the northern Gulf of Mexico.
机译:在2012年6月的海洋学调查期间,使用Acrobat(Sea Sciences Inc.)起伏拖曳船收集了盐度,溶解氧(DO),叶绿素-a和CDOM荧光的观测值。对这些观测值进行了分析,以研究水平和垂直空间变异性,并研究物理和生物学因素与溶解氧浓度分布的关系。该仪器套件配备了CTD和多个传感器,沿16条横架线产生了高空间分辨率(〜200 m)的垂直剖面,这些横架线从德克萨斯州的马塔哥达湾沿得克萨斯州路易斯安那州架子分布到西南at口的密西西比河三角洲,路易斯安那州。与密西西比河淡水羽流有关的特征仅限于东部陆架的小区域,这导致了所分析属性之间的可辨认的东西向梯度。由于强烈的基于盐度的分层,东陆架的盐度低,低氧接近底部,叶绿素上方的叶绿素-a和CDOM荧光值最高。与此相反,西架的特征是分层弱,没有近底低氧,主要盐环下方和海底附近的叶绿素-a和荧光值最大。如果不对其进行监控和补救,则缺氧会对水生生物造成不利影响,并可能对生态系统造成不利影响。这项研究包括自2003年以来由NOAA资助的“机制控制缺氧”项目的一部分,其目的是表征墨西哥北部海湾缺氧的主要物理驱动因素。

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    Calbat Kyle;

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