Shallow gas seeps offshore Crimea (Black Sea): Mapping, bubble flow quantification and geochemical study

Malakhova, T.V.; Makarov, M.M.; Khurchak, A.I.; Stetsiuk, A.P.; Kucher, K.M.; Syrbu, N.S.; Legkodimov, A.A.; Ivanov, M.V.; Budnikov, A.A.

Авторы: Malakhova T.V., Makarov M.M., Khurchak A.I., Stetsiuk A.P., Kucher K.M., Syrbu N.S., Legkodimov A.A., Ivanov M.V., Budnikov A.A.
Журнал: Regional Studies in Marine Science
Том: 89
Год издания: 2025
Первая страница: 1
Последняя страница: 25
Номер статьи: 104290
DOI: 10.1016/j.rsma.2025.104290
Аннотация: This paper is the first focused study of gas bubble emissions at the Crimean shelf in the northern Black Sea. During R/V Professor Vodianickiy 125/1 Сruise in November 2022 hydroacoustic and geochemical studies were carried out to detect gas seepage along Crimean coastline to assess methane-related processes taking place in the local hydrosphere. More than 200 bubble-induced hydroacoustic anomalies in the water column were found at 7.1 km2. We allocated 4 seepage areas which are arranged in the west of the study area and included most of the identified flares located primarily along 35 – 45 m isobaths. Vertical profiles of temperature, salinity, dissolved oxygen content were measured, and a video survey of the seafloor was conducted. The spatial and temporal variability of the flares was examined at Martyan seep site by multiple hydroacoustic surveys on a hours- and days-scales. The observations of the flare appearance showed that most flares are temporally variable. Calculated gas flow rate from individual flare ranged from 4.1 (0.04) to 88.6 (0.101) L·day−1 (t·year−1), while the average value was 38 (0.07) L·day−1 (t·year−1). Distinct methane transport from the seep sites into the hydrosphere was observed only for Martyan seep area by relative enrichments of dissolved methane in near-bottom waters. Sediments from the active seep area were significantly enriched in mercury (87 ± 21 ng g−1) compared to the reference sites (26 ± 7 ng g−1). Our analyses provide one of the first interdisciplinary descriptions of shallow gas seeps sites within the Black Sea seep system.
Добавил в систему: Будников Андрей Александрович

	ИСТИНА	Войти в систему Регистрация
	ИСТИНА ПсковГУ
	Главная Поиск Статистика О проекте Помощь

ИСТИНА

ИСТИНА ПсковГУ

Shallow gas seeps offshore Crimea (Black Sea): Mapping, bubble flow quantification and geochemical studyстатья

Прикрепленные файлы