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Oxygen dynamics in a well mixed estuary, the lower Delaware Bay, USA

机译：充分混合的河口，美国特拉华湾下游的氧气动力学

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摘要

Dissolved oxygen (O_2) and other physical and biological factors were monitored in the lower Delaware Bay using an autonomous buoy. Six weeks of data from the summer of 2007 provide insight into the processes occurring in the lower bay. O_2 concentrations varied at both tidal and diel periodicities and were supersaturated for most of the summer, with day time maxima of up to 390 μM (140% saturation). Extended periods of high wind speed reduced the O_2 concentration to saturation, after which it took up to 4 days for the system to return to a super-saturated state. Air-sea gas exchange rates and net O_2 production rates (primary productivity and respiration) were calculated using the measured O_2 concentrations, wind speed, and tidal currents. O_2 production was modeled using the Delta method and a primary productivity and respiration model. Based on these calculations, the lower Delaware Bay was net autotrophic during the summer of 2007, producing O_2 at a rate of 2.8 μM d~(-1) over the well-mixed 15 m water column. Additionally, this study provides insight into the complexities present at the interface between estuaries and the coastal ocean.
机译：使用自主浮标在特拉华湾下部监测溶解氧（O_2）和其他物理和生物因素。从2007年夏季开始的六周数据可以深入了解下海湾发生的过程。 O_2的浓度在潮汐和diel周期都变化，并且在整个夏季的大部分时间都过饱和，白天最大最大值为390μM（饱和度为140％）。延长的高风速将O_2的浓度降低到饱和状态，此后，系统最多需要4天才能恢复到超饱和状态。使用测得的O_2浓度，风速和潮流计算出海气交换率和O_2净产生率（主要生产力和呼吸作用）。使用Delta方法以及主要的生产力和呼吸模型对O_2的产量进行了建模。根据这些计算，较低的特拉华湾在2007年夏季是自养净的，在充分混合的15 m水柱上以2.8μMd〜（-1）的速率产生O_2。此外，这项研究提供了对河口和沿海海洋之间界面复杂性的见解。

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