Article
Environmental Sciences
Andrey Fedotov, Ruslan Gnatovsky, Vadim Blinov, Maria Sakirko, Valentina Domysheva, Olga Stepanova
Summary: This study revised the delta O-18 and delta H-2 status of Lake Baikal, finding that the lake's isotopic composition is lighter compared to regional precipitation and river inflows. The isotopic composition of the lake has begun to change since 1920, and it is expected to reach a steady state in approximately 226 years.
Article
Thermodynamics
Tao Liu, Haoran Tang, Peng Wu, Haijun Wang, Yuanxin Song, Yanghui Li
Summary: Acoustic wave propagation is effective in detecting hydrate reservoirs due to their unique characteristics. This study measured the wave velocity of sediments using two orthogonal S-waves for the first time and characterized the sediment anisotropy based on the differences in S-wave velocities. The study also proposed a new hydrate growth model and established an empirical formula to estimate hydrate saturation under different effective confining pressures.
Review
Environmental Sciences
Yuanyuan Li, Jingyi Chang, Hailong Lu
Summary: With the increase in natural gas hydrate samples and research approaches, there has been a significant increase in data concerning the geochemical characteristics of hydrate-associated gases in the past decades. This study discusses the primary origins and secondary processes that affect the geochemical characteristics of these gases, and introduces traditional and novel geochemical approaches used to identify their origins and sources.
FRONTIERS IN MARINE SCIENCE
(2022)
Article
Green & Sustainable Science & Technology
Amin Hosseini Zadeh, Ijung Kim, Seunghee Kim
Summary: Hydrate-based CO2 sequestration (HBCS) is a new method to store large amounts of CO2 in geological sediments as crystalline solids. This study investigates the characteristics and kinetics of CO2 hydrate formation and dissociation under different conditions. The results suggest that hydrate nucleation and growth are limited in a porous medium due to solid particles, limited CO2 mass transfer, and heat transfer. Limited CO2 diffusion, hydrate nucleation, and better protection of hydrates are key factors for successful formation in the porous medium.
INTERNATIONAL JOURNAL OF GREENHOUSE GAS CONTROL
(2023)
Article
Biodiversity Conservation
Elena B. Fefilova, Tatyana Y. Sitnikova, Aleksandr A. Novikov
Summary: Based on samples collected in Lake Baikal from 2010 to 2017, the composition and species diversity of harpacticoids in the deep-water zone were analyzed. Nineteen endemic species belonging to the genera Bryocamptus, Attheyella, and Moraria were found. The taxonomic diversity of harpacticoid copepods in the deep-water zone of Lake Baikal is lower than in its littoral zone, but it is expected to increase by 1.5 times.
Article
Thermodynamics
Tao Liu, Peng Wu, Zeshao You, Tao Yu, Qi Song, Yuanxin Song, Yanghui Li
Summary: Natural gas hydrate is a new energy source with enormous reserves and high carbon content. However, its exploitation can involve potentially hazardous solid-liquid-gas phase changes. Understanding the deformation behavior of sediment during hydrate dissociation is crucial for predicting the long-term stability of hydrate reservoirs. This study investigated the deformation behavior of remolded cores during thermal dissociation under anisotropic stress states. The results showed that hydrate dissociation can cause significant sediment deformation, with a deformation rate three orders of magnitude larger than before dissociation.
Review
Energy & Fuels
Saeid Sinehbaghizadeh, Agus Saptoro, Sepideh Amjad-Iranagh, Parisa Naeiji, Angnes Ngieng Tze Tiong, Amir H. Mohammadi
Summary: Clathrate hydrates, or gas hydrates, have gained global attention for their potential use in sustainable technologies. Understanding the phenomena associated with gas hydrates is crucial for their industrial applications and the development of green technologies. Molecular dynamics simulations have been widely used to analyze the physical movements of molecules and the evolution of atomic positions in gas hydrates.
Article
Microbiology
Svetlana M. Chernitsyna, Ivan A. Khalzov, Tatyana Ya Sitnikova, Tatyana Naumova, Andrey Khabuev, Tamara Zemskaya
Summary: The study presented the initial results of microbiomes of benthic invertebrates found in sites with seeps and low-temperature vent of Lake Baikal. Microorganisms were detected in the intestine of an oligochaete from the cold methane seep using microscopy. The analysis revealed high diversity of microorganisms among nematodes, with members identified from 11 phyla, including methanogens, nitrifiers, and nitrogen fixators, as well as those involved in the sulfur cycle.
CURRENT MICROBIOLOGY
(2021)
Article
Multidisciplinary Sciences
Akihiro Hachikubo, Hirotsugu Minami, Hirotoshi Sakagami, Satoshi Yamashita, Alexey Krylov, Gennadiy Kalmychkov, Jeffrey Poort, Marc De Batist, Andrey Manakov, Oleg Khlystov
Summary: The study reports the molecular and stable isotope compositions of hydrate-bound gases collected from 59 sites in Lake Baikal between 2005 to 2019. The hydrate-bound methane has a δD distribution lower than in the marine environment due to the difference in δD between lake water and seawater. Hydrate-bound gases originate from microbial, thermogenic, and mixed gas sources. Microbial ethane was found at approximately one-third of the sites with lower stable isotope compositions compared to thermogenic ethane. The formation process of microbial ethane and methane is affected by the low hydrogen isotope ratios in lake water.
SCIENTIFIC REPORTS
(2023)
Article
Chemistry, Organic
O. M. Khlystov, O. N. Izosimova, A. Hachikubo, H. Minami, M. M. Makarov, A. G. Gorshkov
Summary: A new oil show called Zelenseep was discovered on the eastern shore of Middle Baikal. It is characterized by natural gas discharge from the lake floor and the presence of oil and gas hydrates in the sediments. The gas composition is primarily thermogenic methane. The oil does not enter the water column. The oil contains polycyclic aromatic hydrocarbons and biomarkers indicative of its continental origin and similarity to Baikal naphthenic-aromatic oils. The sediments in the Baikal Basin are considered the source of organic matter.
PETROLEUM CHEMISTRY
(2022)
Article
Forestry
Cheima Barhoumi, Marianne Vogel, Lucas Dugerdil, Hanane Limani, Sebastien Joannin, Odile Peyron, Ahmed Adam Ali
Summary: The study reconstructed the fire history of Siberia during the Holocene, showing a trend of frequent and intense fires in the Early Holocene and lower magnitudes after 6500 cal. yr BP. The change in vegetation composition at the same time as indicated by pollen records also influenced the type of fires.
Article
Environmental Sciences
Liudmila Golobokova, Olga Netsvetaeva, Tamara Khodzher, Vladimir Obolkin, Olga Khuriganova
Summary: This article presents the results of studying the chemical composition of atmospheric deposition at Listvyanka station in 2020 and compares them with previous years, showing changes in ionic composition of atmospheric aerosols and precipitation. The high acidity of precipitation and seasonal variations in major ion contributions were observed. In 2020, wet deposition of most ions decreased, especially calcium, ammonium and nitrates, with significant reductions in nitrogen and sulfur fluxes.
Article
Engineering, Chemical
Nayla Lozada Garcia, Daniela S. Damaceno, Lucidio C. Fardelone, Adriano Ferreira de Mattos Silvares, Joao Pedro Ferreira Del Pintorc, Afonso Henrique Teixeira Mendes, Marcelo F. Costa, Jose Carlos B. Lopes, Song Won Park, Jose Roberto Nunhez
Summary: A scalable continuous process for obtaining CO2 hydrates with high heat removal capacity is proposed. Experimental results show that the process can rapidly form high-concentration hydrates and has higher gas uptake compared to batch systems. The process has the potential to be an effective alternative for CO2 sequestration due to its superior heat removal and mass transfer capabilities.
CHEMICAL ENGINEERING SCIENCE
(2023)
Article
Geosciences, Multidisciplinary
Haoyi Yao, Giuliana Panieri, Moritz F. Lehmann, Tobias Himmler, Helge Niemann
Summary: Current activities of cold seeps in the ocean can be observed directly through methane emissions from the seafloor, presence of chemosynthetic organisms, and high gas concentrations in sediment pore waters and the water column. Past activities can be reconstructed through proxy records of authigenic seep carbonates, which indicate anaerobic oxidation of methane in the seafloor environment.
FRONTIERS IN EARTH SCIENCE
(2021)
Article
Geosciences, Multidisciplinary
Yunyan Ni, Dazhong Dong, Limiao Yao, Jianping Chen, Jianli Sui, Fei Wang, Fei Liu, Jian Li, Jinhao Guo, Dan Liu, Jinliang Gao
Summary: This study conducted a detailed investigation on the hydrogen isotope characteristics of the Wufeng-Longmaxi shale in the Sichuan Basin, revealing the significant influence of gas wetness and cogenetic water medium on hydrogen isotope values.
JOURNAL OF ASIAN EARTH SCIENCES
(2023)
Article
Chemistry, Multidisciplinary
Satoshi Takeya, Akihiro Hachikubo
Summary: Research and development of control technology for N2O greenhouse gas is crucial for sustainable development. The crystallographic structure of N2O hydrate was obtained using powder X-ray diffraction data, showing similar features to CO2 hydrate. The distribution of N2O molecules in different water cages was explored, with an increase in cage occupancy observed with higher formation pressure. The composition and dissociation kinetics of N2O hydrate were discussed in relation to gas storage.
CRYSTAL GROWTH & DESIGN
(2022)
Article
Chemistry, Physical
Yusuke Jin, Masato Kida, Jiro Nagao
Summary: This study reports the conformation selectivity of cyclohexanol in a clathrate hydrate and the effect of hydrogen bonds on lattice shrinkage. The results show that cyclohexanol prefers the equatorial conformation over the axial conformation and that the hydrogen bond between cyclohexanol and the water framework causes a reduction in the lattice constant.
JOURNAL OF PHYSICAL CHEMISTRY C
(2022)
Article
Chemistry, Organic
O. M. Khlystov, O. N. Izosimova, A. Hachikubo, H. Minami, M. M. Makarov, A. G. Gorshkov
Summary: A new oil show called Zelenseep was discovered on the eastern shore of Middle Baikal. It is characterized by natural gas discharge from the lake floor and the presence of oil and gas hydrates in the sediments. The gas composition is primarily thermogenic methane. The oil does not enter the water column. The oil contains polycyclic aromatic hydrocarbons and biomarkers indicative of its continental origin and similarity to Baikal naphthenic-aromatic oils. The sediments in the Baikal Basin are considered the source of organic matter.
PETROLEUM CHEMISTRY
(2022)
Article
Environmental Sciences
Ji-Hoon Kim, Myong-Ho Park, Dong-Hun Lee, Hirotsugu Minami, Young-Keun Jin, Akihiro Hachikubo, Jin Hur, Jong-Sik Ryu, Moo-Hee Kang, Kwangchul Jang, Masato Kida, Yongwon Seo, Meilian Chen, Jong Kuk Hong, Yungoo Song, Sanghee Park
Summary: We investigated the impact of methane seepage on the pore fluid and methane-derived authigenic carbonate (MDAC) chemistry in the ARAON Mounds in the Chukchi Sea. Our findings show that the high methane flux and related byproducts significantly alter the fluid chemistry and physical properties of the sediment columns. This research improves our understanding and prediction of pore fluid and MDAC chemistry in the Arctic Ocean, particularly in relation to methane seepage caused by global climate change.
FRONTIERS IN MARINE SCIENCE
(2022)
Article
Chemistry, Physical
Akinori Hoshikawa, Akihiro Hachikubo
Summary: Hydrogen sulfide hydrate has a lower synthesis pressure due to interactions with water stabilizing its clathrate structure. The hydrogen bonding network in hydrogen sulfide hydrate was investigated using powder neutron diffraction. The distribution of hydrogen atoms of water molecules showed variation from a straight line between oxygen atoms and changed with temperature.
CHEMICAL PHYSICS LETTERS
(2023)
Article
Energy & Fuels
Yusuke Jin, Masato Kida, Jiro Nagao
Summary: In this study, a novel hydrate former with the ability to act as a structure II former and a thermodynamic inhibitor is reported. Thiazole, an aromatic five-ringed molecule, forms an sII hydrate crystal with small CH4 and CO2 molecules. The thiazole molecule exhibits guest-host interactions with water frameworks through hydrogen bonding. This molecule, however, cannot form an sII hydrate with the C2H6 molecule and instead functions as a thermodynamic inhibitor for the sI C2H6 hydrate.
Article
Geochemistry & Geophysics
Shusaku Goto, Makoto Yamano, Manabu Tanahashi, Osamu Matsubayashi, Masataka Kinoshita, Hideaki Machiyama, Sumito Morita, Toshiya Kanamatsu, Akihiro Hachikubo, Satsuki Kataoka, Ryo Matsumoto
Summary: To obtain accurate surface heat flow data in marine areas with large-amplitude bottom-water temperature (BWT) fluctuations, it is important to consider the depth range at which BWT fluctuations affect sediment temperature. This study monitored BWT in the Joetsu Basin of the Japan Sea and determined that BWT fluctuations can disturb sediment temperatures up to a depth of 2 m. Heat flow values of 81-88 mW m(-2) were obtained by measuring sediment temperatures at depths >2 m using a 15 m long geothermal probe.
MARINE GEOPHYSICAL RESEARCH
(2023)
Article
Energy & Fuels
Masato Kida, Reiji Fujiwara, Hayato Goda, Hirotoshi Sakagami, Hirotsugu Minami
Summary: This report investigates the separation characteristics of stoichiometric quaternary ammonium salt (QAS) hydrates for methane and carbon dioxide with simulated biogas. The tests were conducted using different QAS hydrates as solid phases at various temperatures and pressures. The results show that the QAS hydrates have selective incorporation of carbon dioxide into the hydrate phase, with tetra-n-butylammonium chloride (TBAC) hydrate exhibiting the highest separation factor. Lowering the initial pressure improves the separation performance of the QAS hydrates, indicating that they can achieve effective separation even at lower pressures.
Article
Thermodynamics
Akihiro Hachikubo, Kaede Takizawa, Satoshi Takeya
Summary: The stable isotope fractionation between nitrogen gas and hydrate phases during nitrogen hydrate formation was investigated. It was found that nitrogen hydrate was slightly more susceptible to 14N15N inclusion, indicating a slightly lower equilibrium pressure for 14N15N hydrate compared to 14N2 hydrate.
JOURNAL OF CHEMICAL AND ENGINEERING DATA
(2023)
Article
Thermodynamics
Akihiro Hachikubo, Kaede Takizawa, Satoshi Takeya
Summary: Stable isotope ratios of nitrogen gas in ice core air samples are important for studying past climate change. This study investigated the stable isotope fractionation of nitrogen during hydrate formation, finding that the nitrogen hydrate was slightly more susceptible to (NN)-N-14-N-15 inclusion. The results suggest that the equilibrium pressure of (NN)-N-14-N-15 hydrate is slightly lower than that of N-14(2) hydrate.
JOURNAL OF CHEMICAL AND ENGINEERING DATA
(2023)
Article
Energy & Fuels
Yusuke Jin, Masato Kida, Jiro Nagao
Summary: In this study, a novel hydrate former was discovered to act as a structure II (sII) former and thermodynamic inhibitor. Thiazole, an aromatic five-ringed molecule with two heteroatoms, was found to form sII hydrate crystals with small CH4 and CO2 molecules. The guest-host interactions between thiazole and the water frameworks were analyzed, and it was found that thiazole functions as a thermodynamic inhibitor for the structure I (sI) C2H6 hydrate.
Article
Geosciences, Multidisciplinary
E. A. Logvina, A. A. Krylov, T. Matveeva, F. E. Maksimov, V. Yu Kuznetsov
Summary: This paper presents the characteristics and formation mechanisms of authigenic carbonates in the CHAOS structure located in the Deryugin Basin on the western slope of the Sea of Okhotsk. The study reveals that the formation of carbonates is influenced by organic matter and microbial methane, occurring at low temperatures.
VESTNIK OF SAINT PETERSBURG UNIVERSITY EARTH SCIENCES
(2022)
Article
Chemistry, Physical
Sanehiro Muromachi, Masato Kida, Masato Morimoto, Shogo Yamane, Satoshi Takeya
Summary: This paper investigates the manipulation of the structure and properties of semiclathrate hydrates. By adjusting the alkyl side chain length of quaternary ammonium salts, the structure and relevant properties of the hydrates can be modified.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2022)
Article
Geochemistry & Geophysics
E. A. Korago, G. N. Kovaleva, R. A. Schekoldin, V. F. Il'in, E. A. Gusev, A. A. Krylov, D. A. Gorbunov
Summary: Our study focuses on the structure, tectonics, and geological history of the Novaya Zemlya archipelago in the Russian Arctic. We examine the age, causes, and relationships of various geological phenomena, including sedimentation conditions, tectogenesis, orogeny, and the formation of relief. We also provide evidence of active movements of the surrounding seas. The research highlights the importance of understanding the tectonic and geological processes in the region.
Article
Geosciences, Multidisciplinary
Inna Morgunova, Petr Semenov, Anna Kursheva, Ivan Litvinenko, Sergey Malyshev, Sergey Bukin, Oleg Khlystov, Olga Pavlova, Tamara Zemskaya, Alexey A. Krylov
Summary: This paper presents a detailed study on the organic-geochemical proxies in sediment cores from different basins of Lake Baikal. It reveals the variability of organic matter composition and molecular markers for different areas with focused fluid discharge. The analysis suggests the input of both terrestrial and microbial sources in the sediments, and identifies specific biomarkers that reflect changes in microbial activity and the development of methanogenic and methanotrophic microbial communities.