Methane in water columns and sediments of the north western Sea of Japan

Vereshchagina, O. F.; Korovitskaya, E V; Mishukova, G. I.

doi:10.1016/j.dsr2.2012.08.017

Cited by 32 publications

(8 citation statements)

References 17 publications

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“…The atmospheric flux observed in 2019 for plumes LV85-seepC5 and LV85-seepC6 (4.41 and 5.18 μmol/m 2 /day, respectively) is essentially the same as that of the reference site LV85-C2ref. located on the opposite side of Tatar Trough (5.18 μmol/m 2 /day), yet is significantly higher than values previously measured in the southernmost part of Tatar Strait (0.1-0.6 μmol/m 2 /day Vereshchagina et al, 2013). The atmospheric flux that accompanied warm, saline surface and subsurface waters above the plumes in 2015 was greater at between 20.68 μmol/m 2 /day observed at LV70-seepC6 (this study) and 684 μmol/m 2 /day at LV70-20 (Shakirov et al, 2020).…”

Section: Discussioncontrasting

confidence: 65%

“…It could be that some the methane fluxes are variable from year to year as noted by Mishukova et al (2015), in part as a result of sporadic releases of gas following local seismic activity (Shakirov et al, 2020). Although there was no significant difference between plume and reference sites in sampled during LV85 in 2019, all of the calculated fluxes are higher than those of non-plume sites to the south of Tatar Strait which were shown to range from 0.1 μmol/m 2 /day to 0.6 μmol/m 2 /day using a similar method of calculation (Vereshchagina et al, 2013). Aoki et al (2020) demonstrated that methane concentrations in the air just above the sea surface in Umitaka Spur were significantly greater than background atmospheric values in other parts of Japan Sea.…”

Section: Presence and Fate Of Methane At Plume Sitesmentioning

confidence: 88%

“…The samples were then analyzed onboard the R/V Akademik M.A. Lavrentyev for dissolved gases (methane, hydrocarbon gases, carbon dioxide, nitrogen, and oxygen) using shipboard gas chromatographic instrumentation as described in Vereshchagina et al (2013) and Shakirov et al (2019). In order to create headspace gas in the 68 ml bottles, 12 ml high-purity helium was injected through the rubber septum.…”

Section: Sampling and Analysesmentioning

confidence: 99%

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Ocean Dynamics and Methane Plume Activity in Tatar Strait, Far Eastern Federal District, Russia as Revealed by Seawater Chemistry, Hydroacoustics, and Noble Gas Isotopes

et al. 2022

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This investigation presents methane, noble gas isotopes, CTD, and stable isotopic data for water samples collected in Niskin bottles at Tatar Strait during the spring seasons of 2015 and 2019 onboard the Russian R/V Akademik M.A. Lavrentyev. The results are compared to previous research carried out in 1999 in a nearby portion of the Strait and demonstrate that salinity and temperature can change appreciably. The CTD data from 1999 shows warm surface waters underlain by cold subsurface waters. In contrast, the 2015 data show the CTD data that show warm temperatures and high salinity extending down from the surface well into intermediate waters, while the 2019 data show cold surface waters underlain by even colder subsurface waters. CTD data collected above active gas plume sites along Sakhalin Island’s western shore show no substantial difference in temperature or salinity from the non-plume sites, and the methane concentrations at all of the measured sites are significantly above saturation, even in the shallow waters. Hydroacoustic data also suggest the presence of free gas and gas hydrate–coated methane bubbles from the seafloor at least to the base of upper intermediate waters. All of the intermediate and deep Japan Sea Proper waters in Tatar Strait still retain tritiogenic 3He, similar to that observed throughout much of the Japan Sea, indicating limited vertical exchange between these layers and surface waters. An analysis of the δ13C of dissolved inorganic carbon in the seawater shows that positive values are limited to surface waters and that the waters become progressively more depleted in 13C with depth. The results are consistent with research over the past several decades which has shown that ventilation of intermediate and deep Japan Sea Proper water is somewhat limited, while both the temperature and salinity of surface and subsurface water layers within the strait are sensitive to the balance between cold, less saline waters contributed by the Amur River/Primorye Current from the north and warm, saline waters contributed by the Tsushima Current from the south.

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Section: Discussioncontrasting

confidence: 65%

Section: Presence and Fate Of Methane At Plume Sitesmentioning

confidence: 88%

Section: Sampling and Analysesmentioning

confidence: 99%

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Ocean Dynamics and Methane Plume Activity in Tatar Strait, Far Eastern Federal District, Russia as Revealed by Seawater Chemistry, Hydroacoustics, and Noble Gas Isotopes

et al. 2022

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“…The methane concentration in the water column was measured by taking water samples at different depths and subjecting them to chromatographic gas analysis on board the ship [23].…”

Section: Methodsmentioning

confidence: 99%

An acoustic estimate of methane concentration in a water column in regions of methane bubble release

et al. 2014

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A remote acoustic method is presented for estimating the methane flux into water from rising bub bles. With the proposed method and data of hydroacoustic measurements in the Sea of Okhotsk, the dissolved methane concentration profile that forms in the water column in regions of methane bubble release is esti mated. Comparison of the aforementioned methane concentration profile with results of direct measure ments shows good quantitative and qualitative agreement. This testifies to the fair accuracy of the proposed acoustic method and is indicative of the dominant role of bubble transport in the formation of the concentra tion of dissolved methane in the water column in such regions.

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“…Непрерывные метеорологические измерения проводились в течение всех рейсов на портативной метеостанции Davis Vantage Pro2 (USA). Расчет проводился по методу, описанному в работах [Мишукова и др., 2007;Vereshchagina et al, 2013]. Использовалась формула F=ΔC*K общ (1), где: ΔС = Сизм -Сравнразность концентраций метана в морской воде, рассчитывается как разность между измеренной концентрацией метана и равновесной концентрацией, которую имел бы атмосферный метан в морской воде при данной температуре, солености и при атмосферном давлении; К общ = Kт + Ko + Kp, 2 [Мишукова, и др., 2011; Обжиров, и др., 2016; Мишукова, и др., 2017,Мишукова, Шакиров, 2017] [Яницкий, 1979].…”

Section: методика расчета потоков метана на границе «вода-атмосфера»unclassified

Потоки Метана На Границе Вода-Атмосфера В Южной Части Татарского Пролива Японского Моря: Особенности Распределения И Изменчивости

2019

GiG

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Methane in water columns and sediments of the north western Sea of Japan

Cited by 32 publications

References 17 publications

Ocean Dynamics and Methane Plume Activity in Tatar Strait, Far Eastern Federal District, Russia as Revealed by Seawater Chemistry, Hydroacoustics, and Noble Gas Isotopes

Ocean Dynamics and Methane Plume Activity in Tatar Strait, Far Eastern Federal District, Russia as Revealed by Seawater Chemistry, Hydroacoustics, and Noble Gas Isotopes

An acoustic estimate of methane concentration in a water column in regions of methane bubble release

Потоки Метана На Границе Вода-Атмосфера В Южной Части Татарского Пролива Японского Моря: Особенности Распределения И Изменчивости

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