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Atmospheric chemistry

机译：大气化学

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This study investigated sources and sinks of methane (CH_4) and nitrous oxide (N_2O) in the Brisbane River estuary, Australia. Field measurements and laboratory incubation experiments were performed to determine the contribution of the water column, sediments, influent creeks and discharge from a wastewater treatment plant, to greenhouse gas levels occurring in the estuary. Sampling was conducted at 16 sites along the estuary with more detailed studies at three of these sites, located in the lower, middle and upper estuarine reaches, respectively. The estuary is a source of CH_4 and N_2O with their saturation in the surface water ranging between 2160 and 26,900% for CH_4, and between 140 and 230% for N_2O, relative to their respective atmospheric concentrations. Estuarine sediments were identified as sources for both CH_4 and N_2O, as concentrations for both dissolved gases were higher in the pore water at the sediment surfaces in comparison to the water column samples at all sites. Methane and N_2O were produced in silty sediments as shown in sediment-water incubations. Creeks were detected to be a source of CH_4 and N_2O, as their concentrations were higher in the creek in comparison to those measured at the confluence of the creek and the estuary. The estuarine water column was identified as a CH_4 sink; however, the water column was neither a sink nor a source for N_2O. A wastewater treatment plant discharging effluent into the tributary did not contribute significantly to the creek CH_4 levels, but may have elevated N_2O at the direct point of discharge. A budget estimate of the Brisbane River estuary showed that sediments are not the sole source of CH_4, as the sediment-water fluxes are far less (1%) than what is consumed, emitted or transported to the ocean. An unknown CH_4 source is therefore likely present, which is yet to be revealed. In contrast, most of N_2O produced in the estuarine sediments was emitted to the atmosphere.
机译：这项研究调查了澳大利亚布里斯班河河口的甲烷（CH_4）和一氧化二氮（N_2O）的源和汇。进行了现场测量和实验室孵化实验，以确定水柱，沉积物，入水小溪和废水处理厂的排放对河口温室气体含量的影响。在河口的16个地点进行了采样，分别在河口下部，中部和上部河口的三个地点进行了更详细的研究。河口是CH_4和N_2O的来源，相对于它们各自的大气浓度，CH_4和N_2O在地表水中的饱和度在CH_4的范围为2160％至26,900％，在N_2O的范围为140％至230％。河口沉积物被确定为CH_4和N_2O的来源，因为与所有位置的水柱样品相比，沉积物表面孔隙水中两种溶解气体的浓度都较高。如沉积物-水温育所示，在粉质沉积物中产生甲烷和N_2O。小溪被发现是CH_4和N_2O的来源，因为小溪中的浓度高于小溪和河口汇合处测得的浓度。河口水柱被确定为CH_4水槽；但是，水柱既不是N_2O的吸收器，也不是其来源。废水处理厂将废水排放到支流中并没有明显影响小河CH_4的水平，但在排放的直接点处N_2O可能升高。布里斯班河河口的一项预算估计表明，沉积物并不是CH_4的唯一来源，因为沉积物-水通量远小于（消耗或排放）或输送到海洋的水通量（1％）。因此，可能存在未知的CH_4源，有待发现。相反，河口沉积物中产生的大多数N_2O排放到大气中。

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    《Oceanographic Literature Review》 |2016年第2期|269-270|共2页
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