The dynamics of physical and bio‐optical properties on the shelf and the shelf‐slope break areas offshore of the Delaware Bay were investigated. Compared to monthly means, there were elevated daily freshwater outflows. Glider observations demonstrated significant changes in bio‐optical properties before and after sampling fresher water masses. Prior to sampling fresher water masses, the glider observations exhibited a coincidence of high values in bioluminescence (BL) potential, chlorophyll, and optical backscattering. However, as the glider started to sample fresher water masses, there was a gradual decoupling of high values in BL potential with the high values in chlorophyll and optical backscattering. This indicates a shift from an autotrophic and mixotrophic toward a more heterotrophic bioluminescent community between water masses. During the glider survey, a high chlorophyll filament was observed by satellite ocean color imagery along the shelf‐slope break of the Delaware Bay. The high chlorophyll filament had weakened and disappeared in satellite imagery over the next 2 days when upwelling was progressing, and the glider started to sample fresher water masses. The filament was on the dense side of the shelf‐slope front, and the glider observations indicated a subduction of high chlorophyll values into subsurface (below the fresher surface water masses) with high values of BL potential deeper than high values of chlorophyll. The studies presented here are the first BL potential studies on the shelf and the shelf slope areas of the Delaware Bay, as well as the first studies of BL potential resulted from deployments of the glider with BL potential sensor on board.

中文翻译：

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特拉华湾陆架和陆架斜坡上生物发光势和物理，生物光学特性的动力学

研究了特拉华湾近海陆架和陆架倾斜折断区的物理和生物光学特性的动力学。与每月平均值相比，每日淡水流出量有所增加。滑翔机的观测结果表明，在对淡水取样之前和之后，生物光学特性发生了显着变化。在对较新的水团进行采样之前，滑翔机观测结果显示出生物发光（BL）电位，叶绿素和光学反向散射的高值重合。但是，随着滑翔机开始采样较新鲜的水团，BL电位的高值与叶绿素和光学反向散射的高值逐渐退耦。这表明水团之间已从自养和混合营养向更异养的生物发光群落转变。在滑翔机调查期间，沿着特拉华湾架子坡折断处的卫星海洋彩色图像观察到了高叶绿素丝。在上升的过程中，接下来的两天中，高叶绿素细丝在卫星图像中变弱并消失，并且滑翔机开始采样较淡的水团。细丝在架子斜坡前部的密集侧，滑翔机观测表明，高的叶绿素值被俯冲到地下（较新鲜的地表水体以下），而高的BL电位深于高的叶绿素。这里介绍的研究是对德拉湾海湾陆架和陆架斜坡区域的第一批BL潜能研究，也是对在机载BL潜能的滑翔机进行部署而产生的BL潜能的首批研究。