Abstract

Measurements of the methane fluid discharge from bottom sediments and daily monitoring of the main hydrophysical parameters near the site of the bubble gas discharge (seeps) in Laspi Bay have been carried out. Fluid flow values varied by an order of magnitude (1.4–74.3 mmol/(m\({}^{2}\) day)) at points separated by a distance of no more than 10 m. It is assumed that denser carbonate deposits at the seepage site can localize gas flows, thus reducing the volume of fluid discharge. It is shown that the specific fluid discharge in Laspi Bay is comparable with the flow from point seeps; the maximum fluid flow is only 3.5 times lower compared to the minimum recorded seep flow. Changes in hydrological parameters above the gas release point are significantly influenced by waves. The maximum change in salinity during measurements was 0.08%o, which indicates that there is no high-rate freshwater submarine discharge, which often accompanies seeps. Episodes of an abrupt decrease in oxygen content with an amplitude of 0.5 mg/L at night, which are not related to changes in water temperature and meteorological conditions, may be caused by the seepage of hydrogen sulfide in the bubble and fluid gases.

中文翻译：

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用捕集法测量拉斯皮湾（黑海）的甲烷排放量

摘要

已对Laspi湾底部沉积物的甲烷流体排放量进行了测量，并对气泡气体排放（渗漏）部位附近的主要水物理参数进行了日常监测。流体流量值变化一个数量级（1.4–74.3 mmol /（m \（{} ^ {2} \）天）），相距不超过10 m的点。据推测，在渗流部位的碳酸盐沉积物较稠密，可以使气流局部化，从而减少了流体排放量。结果表明，拉斯皮湾的特定流体排放量可与点渗流相媲美。最大流体流量仅比记录的最小渗透流量低3.5倍。瓦斯释放点以上的水文参数变化受到波浪的显着影响。测量过程中盐度的最大变化为0.08％，这表明没有高速率的淡水潜艇排放，通常伴随有渗漏。夜间氧气含量突然下降，幅度为0.5 mg / L，这与水温和气象条件的变化无关，