Dissolved Methane in Coastal Waters of the Northeastern Black Sea

Water

Osmar O. Möller¹  Elena S. Izhitskaya²  Alexander S. Izhitskiy²  Peter O. Zavialov²  Alexander V. Egorov² 

[1] Instituto de Oceanografia, Universidade Federal do Rio Grande (FURG) CP 474, Rio Grande 96201-900, RS, Brazil;Shirshov Institute of Oceanology, Russian Academy of Sciences, 36, Nahimovskiy Prospekt, 117997 Moscow, Russia;

关键词: greenhouse gas;    Black Sea;    aerobic conditions;    continental discharge;    river plume;    shelf area;   

DOI  :  10.3390/w14050732

来源: DOAJ

【 摘 要 】

As the largest methane reservoir in the world, the Black Sea is characterized by significant variability in its dissolved methane distribution patterns. Aerobic waters in the coastal regions are influenced by various factors governing the biogeochemical processes in the water column; however, their impact on the distribution pattern of dissolved methane is not always well studied, especially in the shallow areas of the northeastern Black Sea, which have hitherto not been thoroughly covered by observations. Here, we consider the measurements of methane content in several regions of the northeastern Black Sea carried out from 2013–2017 with large and detailed spatial coverage in order to identify the key factors determining the dissolved methane pattern in each region of the study area. The CH₄ pattern in the region of Sochi is dominated by the impact of river flow. The increased methane saturation in surface waters of the southeastern Crimean shelf (up to 40 nM) is caused by the influence of the Azov Sea outflow. The waters of the Feodosia Bay and to the south of it are mainly characterized by an increase in methane content towards the bottom (up to 100 nM), which is associated with water–sediment interactions and gas emission from the bottom.

【 授权许可】

Unknown