Toki, T., D. Iwata, U. Tsunogai, D.D Komatsu, Y. Sano, N. Takahata, H. Hamasaki, and J. Ishibashi (2017) Formation of gas discharging from Taketomi submarine hot spring off Ishigaki Island in the southern Ryukyu Islands, Japan. Journal of Volcanology and Geothermal Research, 330, 24-35.

Miyakawa, K., E. Ishii, A. Hirota, D.D Komatsu, K. Ikeya, U. Tsunogai (2017) The role of low-temperature organic matter diagenesis in carbonate precipitation within a marine deposit. Applied Geochemistry, 76, 218-231.


Tsunogai, U., L. Cheng, M. Ito, D. D. Komatsu, F. Nakagawa, and H. Shinoara (2016) Remote determinations on fumarole outlet temperatures in an eruptive volcano. Geophysical Research Letters, 43, 22, 11620-11627.

Toki, T., A. Hamamoto, M. Tawata, J. Miyazaki, K. Nakamura, M. Abe, K. Takai, Y. Sano, N. Takahata, U. Tsunogai, J. Ishibashi (2016) Methanogens in H2-rich hydrothermal fluids resulting from phase separation in a sediment-starved, basalt-hosted hydrothermal system. Chemical Geology, 447, 30, 208-218.

Nobuhara, T., D. Onda, T. Sato, H. Aosawa, T. Ishimura, A. Ijiri, U. Tsunogai, N. Kikuchi, Y. Kondo, and S. Kiel (2016) Mass occurrence of the enigmatic gastropod Elmira in the Late Cretaceous Sada Limestone seep deposit in southwestern Shikoku, Japan. Paläontologische Zeitschrift, 90, 4, 701–722.

Sadekov, A., K. Darling, T. Ishimura, C. Wade, K. Kimoto, A. Singh, P. Anand, D. Kroon, S. Jung, G. Ganssen, R. Ganneshram, U. Tsunogai, and H. Elderfield (2016) Geochemical imprints of genotypic variants of Globigerina bulloides in the Arabian Sea. Paleoceanography, 31, 10, 1440-1452.

Toki, T., M. Itoh, D. Iwata, S. Ohshima, R. Shinjo, J. Ishibashi, U. Tsunogai, N. Takahata, Y. Sano, T. Yamanaka, A. Ijiri, N. Okabe, T. Gamo, Y. Muramatsu, Y. Ueno, S. Kawagucci, and K. Takai (2016) Geochemical characteristics of hydrothermal fluids at Hatoma Knoll in the southern Okinawa Trough. Geochemical Journal, 50, 6, 493-525.

Wen, H.-Y., Y. Sano, N. Takahata, Y. Tomonaga, A. Ishida, K. Tanaka, T. Kagoshima, K. Shirai, J. Ishibashi, H. Yokose, U. Tsunogai, and T.F. Yang (2016) Helium and methane sources and fluxes of shallow submarine hydrothermal plumes near the Tokara Islands, Southern Japan. Scientific Reports, 6, Article number 34126, doi:10.1038/srep34126.

Kagoshima, T., Y. Sano, N. Takahata, A. Ishida, Y. Tomonaga, E. Roulleau, D. L. Pinti, T. P. Fischer, T. Lan, Y. Nishio and U. Tsunogai (2016) Spatial and temporal variations of gas geochemistry at Mt. Ontake, Japan. Journal of Volcanology and Geothermal Research, 325, 179-188.

Yamazaki, A., T. Watanabe, U. Tsunogai, F. Iwase, H. Yamano (2016) A 150-year variation of the Kuroshio transport inferred from coral nitrogen isotope signature. Paleoceanography, 31, 6, 838-846.

Tsunogai, U., T. Miyauchi, T. Ohyama, D.D. Komatsu, F. Nakagawa, Y. Obata, K. Sato, and T. Ohizumi (2016) Accurate and precise quantification of atmospheric nitrate in streams draining land of various uses by using triple oxygen isotopes as tracers. Biogeosciences, 13, 3441-3459.
[abstract] [pdf] [doi:10.5194/bg-13-3441-2016]

Ino, K., U. Konno, M. Kouduka, A. Hirota, Y. Togo, A. Fukuda, D. Komatsu, U. Tsunogai, A.S. Tanabe, S. Yamamoto, T. Iwatsuki, T. Mizuno, K. Ito, Y. Suzuki (2016) Deep Microbial Life in High-Quality Granitic Groundwater from Geochemically and Geographically Distinct Underground Boreholes. Environmental Microbiology Reports, 8, 2, 285-94.

Tsunogai, U., and F. Nakagawa (2016) Tracing the origin and fate of atmospheric nitrate by using stable isotopes. Earozoru Kenkyu, Vol.31, No.1, p.5-14.角皆 潤, 中川 書子 (2016) 安定同位体組成を指標に用いた窒素酸化物の起源解析と窒素循環定量への応用. エアロゾル研究, 第31巻, 1号, p.5-14

角皆 潤・蒲生俊敬「10.4 間隙水の採取と分析」(日本地質学会「海洋底科学の基礎」編集委員会編「海洋底科学の基礎」p.233-241)(共立出版)


The GEOTRACES Group (2015) The GEOTRACES Intermediate Data Product 2014. Marine Chemistry, 177, 1-8.

Ishibashi, J. U. Tsunogai, T. Toki, N. Ebina, T. Gamo, Y. Sano, H. Masuda, H. Chiba (2015) Chemical composition of Hydrothermal fluids in the central and southern Mariana trough backarc basin. Deep-Sea Research Part II, 121, 126-136.

Gamo, T., K. Okamura, H. Hatanaka, H. Hasumoto, D. Komatsu, M. Chinen, M. Mori, J. Tanaka, A. Hirota, U. Tsunogai, K. Tamaki (2015) Hydrothermal plumes in the Gulf of Aden, as characterized from light transmission, Mn, Fe, CH4 and δ13C-CH4 anomalies. Deep-Sea Research Part II, 121, 62-70.

Yamanaka, T., H. Nagashio, R. Nishio, K. Kondo, T. Noguchi, K. Okamura, T. Nunoura, H. Makita, K. Nakamura, H. Watanabe, K. Inoue, T. Toki, K. Iguchi, U. Tsunogai, R. Nakada, S. Ohshima, S. Toyoda, J. Kawai, N. Yoshida, A. Ijiri, and M. Sunamura (2015) Tarama Knoll: Geochemical and Biological Profiles of Hydrothermal Activity. In: Subseafloor Biosphere Linked to Hydrothermal Systems: TAIGA Concept, Ishibashi, J., Okino, K., Sunamura, M. (Eds.), pp.497-504, Springer Japan, DOI: 10.1007/978-4-431-54865-2_40.

Toki, T., J. Ishibashi, T. Noguchi, M. Tawata, U. Tsunogai, T. Yamanaka, and K. Nakamura (2015) Chemical and Isotopic Compositions of Hydrothermal Fluids at Snail, Archaean, Pika, and Urashima Sites in the Southern Mariana Trough. In: Subseafloor Biosphere Linked to Hydrothermal Systems: TAIGA Concept, Ishibashi, J., Okino, K., Sunamura, M. (Eds.), pp.587-602, Springer Japan, DOI: 10.1007/978-4-431-54865-2_45.

Yamazaki, A., T. Watanabe, U. Tsunogai, H. Hasegawa, H. Yamano (2015) The coral δ15N record of terrestrial nitrate loading varies with river catchment land use. Coral Reefs, 34, 1, 353-362.


Suzuki, Y., U. Konno, A. Fukuda, D.D. Komatsu, A. Hirota, Y. Togo, N. Morikawa, H. Hagiwara, D. Aosai, T. Iwatsuki, U. Tsunogai, S. Nagao, K. Ito, T. Mizuno (2014) Biogeochemical Signals from Deep Microbial Life in Terrestrial Crust, PLoS ONE, 9(12), e113063, doi:10.1371/journal.pone.0113063.

Toki, T., R. Higa, A. Ijiri, U. Tsunogai and J. Ashi (2014) Origin and transport of pore fluids in the Nankai accretionary prism inferred from chemical and isotopic compositions of pore water at cold seep sites off Kumano. Earth Planets and Space, 66, 137, doi:10.1186/s40623-014-0137-3.
[abstract] [PDF link: 1.1 MB] [doi:10.1186/s40623-014-0137-3]

Tsunogai, U. and F. Nakagawa (2014) Isotopes in Environmental Sciences No. 3, Applying stable isotopes for studying behavior of trace components. J. Jpn. Soc. Atmos. Environ., 49 No. 5, A63-A72 (in Japanese).角皆 潤, 中川 書子, 同位体環境科学第3講:安定同位体比によるプロセス解析. 大気環境学会誌, 第49巻, 5号, A63-A72
[doi:10.11298/taiki.49.A63] [PDF link (J-stage): 1.5 MB]

Tsunogai, U., Komatsu, D. D., Ohyama, T., Suzuki, A., Nakagawa, F., Noguchi, I., Takagi, K., Nomura, M., Fukuzawa, K., and Shibata, H. (2014) Quantifying the effects of clear-cutting and strip-cutting on nitrate dynamics in a forested watershed using triple oxygen isotopes as tracers. Biogeosciences, 11, 5411–5424.
[abstract] [PDF link: 2.1 MB] [doi:10.5194/bg-11-5411-2014]

Zhang, D., C. Zhang, Z. Li, D. Suzuki, D.D Komatsu, U. Tsunogai, and A. Katayama (2014) Electrochemical Stimulation of Microbial Reductive Dechlorination of Pentachlorophenol Using Solid-State Redox Mediator (Humin) Immobilization. Bioresource Technology, 164, 232–240.

Tanimoto, H., S. Kameyama, Y. Omori, S. Inomata and U. Tsunogai (2014) High-Resolution Measurement of Volatile Organic Compounds Dissolved in Seawater Using Equilibrator Inlet-Proton Transfer Reaction-Mass Spectrometry (EI-PTR-MS). In: Western Pacific Air-Sea Interaction Study (Eds. M. Uematsu, Y. Yokouchi, Y. W. Watanabe, S. Takeda, and Y. Yamanaka), pp. 89-115, doi:10.5047/w-pass.a02.001, TERRAPUB.

Kawada, Y., T. Toki, M. Kinoshita, M. Joshima, R. Higa, T. Kasaya, U. Tsunogai, K. Nishimura, K. Kisimoto (2014) Tracing geologically constrained fluid flow pathways using a combination of heat flow measurements, pore water chemistry, and acoustic imaging near the deformation front of the Nankai Trough off the Muroto Peninsula, Japan. Tectonophysics, 618, 121-137.

Notsu, K., R. Sohrin, H. Wada, T. Tsuboi, H. Sumino, T. Mori, U. Tsunogai, P.A. Hernandez, Y. Suzuki, R. Ikuta, K. Oorui, M. Koyama, T. Masuda, N. Fujii (2014) Leakage of magmatic-hydrothermal volatiles from a crater bottom formed by a submarine eruption in 1989 at Teishi Knoll, Japan. Journal of Volcanology and Geothermal Research, 270, 90-98.


Katsuyama, C., Nashimoto, H., Nagaosa, K., Ishibashi, T., Kinoshita, T., Yoshikawa, H., Aoki, K., Asano, T., Sasaki, Y., Sohrin, R., Komatsu, D., Tsunogai, U., Kimura, H., Suwa, Y., Kato, K. (2013) Occurrence and potential activity of denitrifiers and methanogens in groundwater at 140 m depth in Pliocene diatomaceous mudstone of northern Japan. FEMS Microbiology Ecology, 86, 532–543.

Kameyama, S., H. Tanimoto, S. Inomata, H. Y. Inoue, U. Tsunogai, A. Tsuda, M. Uematsu, M. Ishii, and D. Sasano (2013) Strong relationship between dimethyl sulfide and net community production in the western subarctic Pacific. Geophysical Research Letters, 40, 3986–3990.

Yamazaki, A., T. Watanabe, N. Takahata, Y. Sano, and U. Tsunogai (2013) Nitrogen isotopes in intra-crystal coralline aragonites. Chemical Geology, 351, 276–280.

Nakagawa, F., A. Suzuki, S. Daita, T. Ohyama, D.D. Komatsu and  U. Tsunogai (2013) Tracing atmospheric nitrate in groundwater using triple oxygen isotopes: Evaluation based on bottled drinking water. Biogeosciences, 10, 3547-3558.
[abstract] [PDF link: 1680 kB] [doi:10.5194/bg-10-3547-2013]

Yamanaka, T., K. Maeto, H. Akashi, J. Ishibashi, Y. Miyoshi, K. Okamura, T. Noguchi, Y. Kuwahara, T. Toki, U. Tsunogai, T. Ura, T. Nakatani, T. Maki, K. Kubokawa, H. Chiba (2013) Shallow submarine hydrothermal activity with abundant magmatic water producing talc chimneys in the Wakamiko Crater of Kagoshima Bay, southern Kyushu, Japan. Journal of Volcanology and Geothermal Research, 258, 74–84.

Issa, T. Ohba, F. Wilson, Y. Yoshida, F. Alain, M. Kusakabe, U. Tsunogai, Y. Oginuma, C. T. Boris, G. Tanyileke, S. Nkamdjou, H. Satake and J.V. Hell (2013) Contribution of methane to total gas pressure in deep waters at lakes Nyos and Monoun (Cameroon, West Africa). Geochemical Journal, 47, 3, 349-362.

Konno, U., M. Kouduka, D.D. Komatsu, K. Ishii, A. Fukuda, U. Tsunogai, K. Ito, and Y. Suzuki (2013) Novel microbial populations colonized in deep granitic groundwater from Grimsel Test Site, Switzerland. Microbial Ecology, 65, 626-637.

Kitagawa, T., T. Ishimura, R. Uozato, K. Shirai, Y. Amano, A. Shinoda, T. Otake, U. Tsunogai, and S. Kimura (2013) Otolith δ18O of Pacific bluefin tuna (Thunnus orientalis) as an indicator of ambient water temperature. Marine Ecology Progress Series, 481, 199-209.

von Glasow, R., T. Jickells, A. Baklanov, G.R. Carmichael, T. Church, L. Gallardo, C. Hughes, M. Kanakidou, P. Liss, L. Mee, R. Raine, P. Ramachandran, R. Ramesh, K. Sundseth, U. Tsunogai, M. Uematsu, and T. Zhu (2013) Megacities and large urban agglomerations in the Coastal Zone: Interactions between atmosphere, land and marine ecosystems. AMBIO, 42, 13-28.

Saito, H., Suzuki, N., and Tsunogai, U. (2013) Data report: carbon isotope compositions of methane in void gas samples from IODP
Expedition 315 Site C0001, Nankai Trough, offshore Japan. In Kinoshita, M., Tobin, H., Ashi, J., Kimura, G., Lallemant, S., Screaton, E.J., Curewitz, D., Masago, H., Moe, K.T., and the Expedition 314/315/316 Scientists, Proc. IODP, 314/315/316: Tokyo (Integrated Ocean Drilling Program Management International, Inc.)

Tsunogai, U., D.D. Komatsu, and F. Nakagawa (2013) Remote temperature sensing on volcanic fumaroles using HIReTS: Applications to Satsuma-Iwojima volcano, Japan. Bulltein of the Volcanological Society of Japan, 58, 3, 443-459 (in Japanese with English abstract).〈角皆 潤, 小松大祐, 中川書子 (2013) HIReTS法を用いた火山噴気の遠隔温度測定:薩摩硫黄島における検証. 火山, Vol. 58, No.3, 443-459.
[abstract (Nagoya Repository)] [PDF link
(Nagoya Repository): 1.2MB]

Toki, T., R. Higa, A. Tanahara, A. Ijiri, U. Tsunogai, J. Ashi (2013) Origin of pore water in Kumano mud volcanoes. Chikyukagaku (Geochemistry), Vol.47, No.4, 221-236 (in Japanese with English abstract).土岐知弘, 比嘉良作, 棚原朗, 井尻暁, 角皆潤, 芦寿一郎 (2013) 熊野泥火山における間隙水の起源. 地球化学 Vol.47, No.4, 221-236.


Tsunogai, U., K. Maegawa, S. Sato, D.D. Komatsu, F. Nakagawa, T. Toki, and J. Ashi (2012) Coseimic massive methane release from a submarine mud volcano. Earth and Planetary Science Letters, 341-344, 79-85.

Ishimura, T., U. Tsunogai, S. Hasegawa, F. Nakagawa, T. Oi, H. Kitazato, H. Suga, and T. Toyofuku (2012) Variation in stable carbon and oxygen isotopes of individual benthic foraminifera: tracers for quantifying the magnitude of isotopic disequilibrium. Biogeosciences, 9, 4353-4367.
[abstract] [PDF link: 3321 kB]

Ijiri, A., N. Harada, A. Hirota, U. Tsunogai, N.O. Ogawa, T. Itaki, B.-K. Khim, M. Uchida (2012) Biogeochemical processes involving acetate in sub-seafloor sediments from the Bering Sea shelf break. Organic Geochemistry, 48, 47-55.
[abstract] [doi:10.1016/j.orggeochem.2012.04.004]

Kato, S., K. Nakamura, T. Toki, J. Ishibashi, U. Tsunogai, A. Hirota, M. Ohkuma, and A. Yamagishi (2012) Iron-based microbial ecosystem on and below the seafloor: a case study of hydrothermal fields of the Southern Mariana Trough. Frontiers in Microbiology, 3, 89, doi: 10.3389/fmicb.2012.00089.
[abstract] [doi:10.3389/fmicb.2012.00089]

Kawagucci, S., Y.T. Yoshida, T. Noguchi, M.C. Honda, H. Uchida, H. Ishibashi, F. Nakagawa, U. Tsunogai, K. Okamura, Y. Takaki, T. Nunoura, J. Miyazaki, W. Lin, H. Kitazato, and K. Takai (2012) Disturbance of deep-sea environments induced by the M9.0 Tohoku Earthquake. Scientific Reports, 2, 270, doi:10.1038/srep00270.
[abstract] [doi:10.1038/srep00270]

Toki, T., Y. Uehara, K. Kinjo, A. Ijiri, U. Tsunogai, H. Tomaru, J. Ashi (2012) Methane production and accumulation in the Nankai accretionary prism: Results from IODP Expeditions 315 and 316. Geochemical Journal, 46, 89-106.

Gamo, T., U. Tsunogai, A. Hirota, N. Nakayama, D.-J. Kang, and K.-R. Kim (2012) First measurements of methane and its carbon isotope ratio in the Japan Sea (East Sea). Marine Chemistry, 128-129, 92-99.
[abstract] [doi:10.1016/j.marchem.2011.10.006]


Toki, T., R. Honda, K. Oomine, D. Iwata, U. Tsunogai, D.D. Komatsu, Y. Sano, N. Takahata, J. Ishibashi, M. Kinoshita, H. Yamashiro (2012) The origin of methane in crustal fluids around the Ryukyu Islands. Chikyukagaku (Geochemistry), Vol.46, No.4, 257-274 (in Japanese with English abstract).土岐 知弘,本田 龍太郎,大嶺 一希,岩田 大吾,角皆 潤小松 大祐,佐野 有司,高畑 直人,石橋 純一郎,木下 正高,山城 秀之(2012)「琉球諸島周辺の地殻内部流体中のメタンの起源」地球化学, Vol.46, No.4, 257-274.


Yamazaki, A., T. Watanabe and U. Tsunogai (2011) Nitrogen isotopes of organic nitrogen in reef coral skeletons as a proxy of tropical nutrient dynamics. Geophys. Res. Lett., 38, L19605, doi:10.1029/2011GL049053.
[abstract] [doi:10.1029/2011GL049053]

Komatsu, D.D., U. Tsunogai, K. Kamimura, U. Konno, T. Ishimura, and F. Nakagawa (2011) Stable hydrogen isotopic analysis of nanomolar molecular hydrogen by automatic multi-step gas chromatographic separation. Rapid Communications in Mass Spectrometry, 25, 3351-3359.
[abstract] [doi:10.1002/rcm.5231]

Tsunogai, U., K. Kamimura, S. Anzai, F. Nakagawa, and D.D. Komatsu (2011) Hydrogen isotopes in volcanic plumes: Tracers for remote temperature sensing of fumaroles. Geochimica et Cosmochimica Acta, 75, 4531-4546.

Kameyama, S., H. Tanimoto, S. Inomata, K. Suzuki, D.D. Komatsu, A. Hirota, U. Konno, and U. Tsunogai (2011) Application of PTR-MS to incubation experiments of the marine diatom Thalassiosira pseudonana. Geochemical Journal, 45, 355-363.
[PDF link: 448 kB] [doi:10.2343/geochemj.1.0127]

Nakada, R., Y. Takahashi, U. Tsunogai, G. Zheng, H. Shimizu, and K.H. Hattori (2011) A geochemical study on mud volcanoes in the Junggar Basin, China. Applied Geochemistry, 26, 1065-1076.
[abstract] [doi: 10.1016/j.apgeochem.2011.03.011]

Tsunogai, U., S. Daita, D.D. Komatsu, F. Nakagawa, and A. Tanaka (2011) Quantifying nitrate dynamics in an oligotrophic lake using Δ17O. Biogeosciences, 8, 687-702.
[abstract] [PDF link: 1068 kB] [HUSCAP link]

Toki, T., K. Maegawa, U. Tsunogai, S. Kawagucci, N. Takahata, Y. Sano, J. Ashi, M. Kinoshita, and T. Gamo (2011) Gas chemistry of pore fluids from Oomine Ridge on the Nankai accretionary prism. in: Accretionary Prisms and Convergent Margin Tectonics in the Northwest Pacific Basin (eds. Y. Ogawa, R. Anma and Y. Dilek), Springer, 247-262.
[doi link (book)] [doi link (article)]

Saito, T., O. Stein, U. Tsunogai, K. Kawamura, T. Nakatsuka, T. Gamo, and N. Yoshida (2011) Stable carbon isotope ratios of ethane over the North Pacific: atmospheric measurements and global chemical transport modeling. Journal of Geophysical Research, 116, D02308, doi:10.1029/2010JD014602.
[abstract] [doi link]

Gay, A., Y. Takano, K.W.P. Gilhooly III, C. Berndt, Heeschen, N. Suzuki, S. Saegusa, F. Nakagawa, U. Tsunogai, S.Y. Jiang, M. Lopez (2011) Geophysical and geochemical evidence of large scale fluid flow within shallow sediments in the eastern Gulf of Mexico, offshore Louisiana. Geofluids, 11, 34-47.
[abstract] [doi link]


Watsuji, T., S. Nakagawa, S. Nemoto, M. Kitada, S. Tsuchida, J. Kakuta, T. Toki, A. Hirota, U. Tsunogai and K. Takai (2010) Diversity and Function of Epibiotic Microbial Communities on the Galatheid Crab, Shinkaia crosnieri. Microbes and Environments 25, 288-294.
[abstract] [doi link]

Kameyama, S. H. Tanimoto, S. Inomata, U. Tsunogai, A. Ooki, S. Takeda, H. Obata, M. Uematsu (2010) High-resolution measurement of multiple volatile organic compounds dissolved in seawater using equilibrator inlet-proton transfer reaction-mass spectrometry (EI-PTR-MS). Marine Chemistry, 122, 59-73.
[doi link]

Nakayama, N., J. Ashi, U. Tsunogai, T. Gamo, M. Tanahashi (2010) Sources of pore water in a Tanegashima mud volcano inferred from chemical and stable isotopic studies. Geochemical Journal, 44, 561-569.
[PDF link: 296kB] [doi:10.2343/geochemj.1.0094]

Tsunogai, U., A. Kosaka, N. Nakayama, D.D. Komatsu, U. Konno, S. Kameyama, F. Nakagawa, H. Sumino, K. Nagao, K. Fujikura, and H. Machiyama (2010) Origin and fate of deep-sea seeping methane bubbles at Kuroshima knoll, Ryukyu forearc region, Japan. Geochemical Journal, 44, 477-487.
[PDF link: 1.4MB] [doi:/10.2343/geochemj.1.0096] [abstract (HUSCAP)] [PDF link (HUSCAP)]

Kawagucci, S., K. Shirai, T.F. Lan, N. Takahata, U. Tsunogai, Y. Sano, and T. Gamo (2010) Gas geochemical characteristics of hydrothermal plumes at the HAKUREI and JADE vent sites, the Izena Cauldron, the Okinawa Trough. Geochemical Journal, 44, 507-518.
[PDF link: 580kB] [doi:10.2343/geochemj.1.0100]

Gamo, T., U. Tsunogai, S. Ichibayashi, H. Chiba, H. Obata, T. Oomori, T. Noguchi, E. T. Baker, T. Doi, M. Maruo and Y. Sano (2010) Microbial carbon isotope fractionation to produce extraordinarily heavy methane in aging hydrothermal plumes over the southwestern Okinawa Trough. Geochemical Journal, 44, 477-487.
[PDF link: 2.6MB] [doi:10.2343/geochemj.1.0097]

Fukuda, A., H. Hagiwara, T. Ishimura, M. Kouduka, Y. Amano, U. Tsunogai, Y. Suzuki, T. Mizuno (2010) Geomicrobiological Properties of Ultra-Deep Granitic Groundwater from the Mizunami Underground Research Laboratory (MIU), Central Japan. Microbial Ecology, 60, 214-225.
[abstract] [doi link]

Hirota, A., U. Tsunogai, D. D. Komatsu, and F. Nakagawa (2010) Simultaneous determination of δ15N and δ18O of N2O and δ13C of CH4 in nanomolar quantities from a single water sample. Rapid Communications in Mass Spectrometry, 24, 1085-1092.
[abstract] [doi link]

Konno, U., U. Tsunogai, D.D. Komatsu, S. Daita, F. Nakagawa, A.Tsuda, T. Matsui, Y.-J. Eum and K. Suzuki (2010) Determination of total N2 fixation rates in the ocean taking into account both the particulate and filtrate fractions. Biogeosciences, 7, 2369-2377.
[abstract] [PDF link: 1388 kB] [abstract

Tsunogai, U., D.D. Komatsu, S. Daita, G.A. Kazemi, F. Nakagawa, I. Noguchi, and J. Zhang (2010) Tracing the fate of atmospheric nitrate deposited onto a forest ecosystem in eastern Asia using Δ17O. Atmospheric Chemistry and Physics, 10, 1809-1820.
[abstract] [PDF link: 1598 kB] [HUSCAP abstract]

Nunoura, T., H. Oida, M. Nakaseama, A. Kosaka, S.B. Ohkubo, T. Kikuchi, H. Kazama, S.H. Tanabe, K. Nakamura, M. Kinoshita, H. Hirayama, F. Inagaki, U. Tsunogai, J. Ishibashi, and K. Takai (2010) Archaeal diversity and distribution along thermal and geochemical gradients in hydrothermal sediments at the Yonaguni Knoll IV, the Southern Okinawa Trough. Applied and Environmental Microbiology, 76, 4, 1198-1211.
[doi link]

角皆 潤小松 大祐代田 里子中川 書子・野口 泉・張 勁 (2010)「三酸素同位体組成を指標に用いた大気沈着窒素ー森林生態系間相互作用の定量的評価法(総説)」低温科学、第68巻, 107-120.
[abstract] [PDF: 1.3 MB]

野口泉・林健太郎・加藤拓紀・山口高志・秋山雅行・大塚英幸・酒井茂克・高木健太郎・深澤達矢・柴田英昭・藤沼康実・三枝信子・下鳥稔・遠藤朋美・家合浩明・松田和秀・角皆潤・原宏(2010)「北日本における亜硝酸ガス濃度と窒素酸化物由来成分の挙動」大気環境学会誌, 45, 153-165.
[abstract (ciNii)]

角皆 潤ほか42名 (2010)「地球惑星科学入門」(在田一則・竹下徹・見延庄士郎・渡部重十編)(北海道大学出版)[contents]

角皆 潤ほか著者多数 (2010)「生物学辞典」(石川 統・黒岩常祥・塩見正衞・松本忠夫・守 隆夫・八杉貞雄・山本正幸編)(東京化学同人)[contents]


Kato, K., K. Nagaosa, H. Kimura, C. Katsuyama, K. Hama, T. Kunimaru, U. Tsunogai and K. Aoki (2009) Unique distribution of deep groundwater bacteria constrained by geological setting. Environmental Microbiology Reports, 1, 569-574.

Kameyama, S., H. Tanimoto, S. Inomata, U. Tsunogai, A. Ooki, Y. Yokouchi, S. Takeda, H. Obata, and M. Uematsu (2009) Equilibrator inlet-proton transfer reaction-mass spectrometry (EI-PTR-MS) for fast and sensitive measurements of dimethyl sulfide in seawater. Analytical Chemistry, 81, 9021-9026.
[doi link]

Miyazaki, J., R. Higa, T. Toki, J. Ashi, U. Tsunogai, T. Nunoura, H. Imachi, and K. Takai (2009) Molecular characterization of potential nitrogen fixation by anaerobic methane oxidizing archaea in the methane-seep sediments at the No. 8 Kumano Knoll in the Kumano Basin, off shore of Japan. Applied and Environmental Microbiology, 75, 7153-7162.
[doi link]

Hirota, A., A. Ijiri, D.D. Komatsu, S.B. Ohkubo, F. Nakagawa, and U. Tsunogai (2009) Enrichment of nitrous oxide in a water column in the Bering and Chukchi Sea area. Marine Chemistry, 116, 47-53.
[doi link]

Ijiri, A., U. Tsunogai, T. Gamo, F. Nakagawa, T. Sakamoto, and S. Saito (2009) Enrichment of adsorbed methane in authigenic carbonate concretions. Geo-Marine Letters 29, 301-308.
[doi link]

Kameyama, S., U. Tsunogai, F. Nakagawa, M. Sasakawa, D.D. Komatsu, A. Ijiri, J. Yamaguchi, T. Horiguchi, H. Kawamura, A. Yamaguchi, and A. Tsuda (2009) Enrichment of alkanes within a phytoplankton bloom during an in situ iron enrichment experiment in the western subarctic Pacific. Marine Chemistry, 115, 92-101.
[doi link]

Tohjima, Y., K. Katsumata, I. Morino, H. Mukai, T. Machida, I. Akama, T. Amari, and U. Tsunogai (2009) Theoretical and experimental evaluation of the isotope effect of NDIR analyzer on atmospheric CO2 measurement. Journal of Geophysical Research, 114, D13302, doi:10.1029/2009JD011734.
[abstract] [doi link]

Saito, T., K. Kawamura, U. Tsunogai, T.-Y. Chen, H. Matsueda, T. Nakatsuka, T. Gamo, M. Uematsu, and B.J. Huebert (2009) Photochemical histories of non-methane hydrocarbons inferred from their stable carbon isotope ratio measurements over East Asia. Journal of Geophysical Research, 114, D11303, doi:10.1029/2008JD011388.
[abstract] [doi link]

Suzuki, R., T. Suko, H. Yoshioka, M. Takahashi, K. Nanba, U. Tsunogai, N. Takeno, K. Ito (2009) Biogeochemical profiles in deep sedimentary rocks in an inland fore-arc basin, Central Japan. Chemical Geology, 259, 107-119.

Kimoto, K., T. Ishimura, U. Tsunogai, T. Itaki, Y. Ujiie (2009) Living triserial planktic foraminifera Gallitellia vivans (Cushman): distribution, stable isotopes, and paleoecological implications. Marine Micropaleontology, 71, 71-79.

[doi link]

石村豊穂・角皆 潤 (2009)「高感度安定同位体組成定量法を用いた生物源炭酸塩の微小領域における安定同位体比分散の解明とその応用」月刊地球 31(11), p.604-609.


Kumagai, H., K. Nakamura, T. Toki, T. Morishita, K. Okino, J. Ishibashi, U. Tsunogai, S. Kawagucci, T. Gamo, T. Shibuya, T. Sawaguchi, N. Neo, M. Joshima, T. Sato, and K. Takai (2008) Geological background of the Kairei and Edmond hydrothermal fields along the Central Indian Ridge: Implications of their vent fluids' distinct chemistry. Geofluids, 8, 239-251.

Suzuki, R., Ishibashi J., Nakaseama M., Konno, U., Tsunogai, U., Gena, K., Chiba, H. (2008) Diverse range of mineralization induced by phase separation of hydrothermal fluid: Case study of the Yonaguni Knoll IV hydrothermal field in the Okinawa Trough back-arc basin. Resource Geology, 58, 267-288.

Kawagucci, S., K. Okamura, K. Kiyota, U. Tsunogai, Y. Sano, K. Tamaki, and T. Gamo (2008) Methane, manganese, and helium-3 in newly discovered hydrothermal plumes over the Central Indian Ridge, 18-20°S. Geochemistry, Geophysics, Geosystems., 9, Q10002, doi:10.1029/2008GC002082.
[abstract] [doi]

Toki, T., U. Tsunogai, J. Ishibashi, M. Utsumi, and T. Gamo (2008) Methane enrichment in low-temperature hydrothermal fluid from the Suiyo Seamount in the Izu-Bonin Arc of the western Pacific Ocean. Journal of Geophysical Research, 13, B08S13, doi:10.1029/2007JB005476.
[abstract] [doi:10.1029/2007JB005476]

Naraoka, H., T. Naito, T. Yamanaka, U. Tsunogai, and K. Fujikura (2008) A multi-isotope study of deep-sea mussels at three different hydrothermal vent sites in the northwestern Pacific. Chemical Geology, 255, 25-32.

Kawagucci, S., U. Tsunogai, S. Kudo, F. Nakagawa, H. Honda, S. Aoki, T. Nakazawa, M. Tsutsumi, and T. Gamo (2008), Long-term observation of mass-independent oxygen isotope anomaly in stratospheric CO2. Atmos. Chem. Phys., 8, 6189-6197.
[abstract] [PDF: 664 kB]

Takai, K., K. Nakamura, T. Toki, U. Tsunogai, M. Miyazaki, H. Hirayama, S. Nakagawa, T. Nunoura and K. Horikoshi (2008) Highest temperature limit for growth and isotopically heavy CH4 by a hyperthermophilic methanogen under high pressures cultivation. Proc. Nat. Acad. Sci. U.S.A., 105, 10949-10954.

Ishimura, T., U. Tsunogai, and F. Nakagawa (2008) Grain-scale heterogeneities in the stable carbon and oxygen isotopic compositions of the international standard calcite materials (NBS19, NBS18, IAEA-CO-1, and IAEA-CO-8). Rapid Communications in Mass Spectrometry, 22, 1925-1932.
[abstract] [doi:10.1002/rcm.3571]

Komatsu, D.D., T. Ishimura, F. Nakagawa, and U. Tsunogai (2008) Determination of the 15N/14N, 17O/16O, and 18O/16O ratios of nitrous oxide by using continuous-flow isotope ratio mass spectrometry. Rapid Communications in Mass Spectrometry, 22, 1587-1596.
[abstract] [doi:10.1002/rcm.3493]

Uchida, M., K. Ohkushi, K. Kimoto, F. Inagaki, T. Ishimura, U. Tsunogai, T. TuZino, Y. Shibata (2008) Radiocarbon-based carbon source quantification of anomalous isotopic foraminifera in glacial sediments in the western North Pacific. Geochemistry, Geophysics and Geosystems, 9, Q04N14, doi:10.1029/2006GC001558.

Tsunogai, U., T. Kido, A. Hirota, S.B. Ohkubo, D.D. Komatsu, and F. Nakagawa (2008) Sensitive determinations of stable nitrogen isotopic composition of organic nitrogen through chemical conversion to N2O. Rapid Communications in Mass Spectrometry, 22, 345-354.
[abstract] [doi:10.1002/rcm.3368]

Sasakawa, M., U. Tsunogai, S. Kameyama, F. Nakagawa, Y. Nojiri, A. Tsuda (2008) Carbon isotopic characterization for the origin of excess methane in subsurface seawater. Journal of Geophysical Research, 113, C03012, doi: 10.1029/ 2007JC004217.

Inomata, S., H. Tanimoto, S. Kameyama, U. Tsunogai, H. Irie, Y. Kanaya, and Z. Wang (2008) Technical Note: Determination of formaldehyde mixing ratios in air with PTR-MS: Laboratory experiments and field measurements. Atmospheric Chemistry and Physics, 8, 273-284.
[abstract] [PDF: 1081 kB]

角皆 潤 (2008)「第11章 炭素循環と環境変化」(沢田健・綿貫豊・栃内新・馬渡峻輔編「地球の変動と生物進化」p.239-257)(北海道大学出版)

渡邊 剛、岨 康輝、白井厚太朗、石村豊穂、坂井三郎、横山一己、角皆 潤、佐野有司 (2008)「シャコガイ殻の同位体比、微量元素分析ーシャコガイ殻は日単位の環境変動を記録しているのかー」月刊地球、Vol.30,No.7 316-320.


Tsuda, A., S. Takeda, H. Saito, J. Nishioka, I. Kudo, Y. Nojiri, K. Suzuki, M. Uematsu, M.L. Wells, D. Tsumune, T. Yoshimura, T. Aono, T. Aramaki, W.P. Cochlan, M. Hayakawa, K. Imai, T. Isada, Y. Iwamoto, W. K. Johnson, S. Kameyama, S. Kato, H. Kiyosawa, Y. Kondo, M. Levasseur, R.J. Machida, I. Nagao, F. Nakagawa, T. Nakanishi, S. Nakatsuka, A. Narita, Y. Noiri, H. Obata, H. Ogawa, K. Oguma, T. Ono, T. Sakuragi, M. Sasakawa, M. Sato, A. Shimamoto, H. Takata, C.G. Trick, Y.W. Watanabe, C.S. Wong and N. Yoshie (2007) Evidence for the Grazing Hypothesis: Grazing Reduces Phytoplankton Responses of the HNLC Ecosystem to Iron Enrichment in the Western Subarctic Pacific (SEEDS II). Journal of Oceanography, 63, pp. 983-994.

Toki, T., U. Tsunogai, T. Gamo, and M. Tanahashi (2007) Geochemical study of pore fluid in surface sediment at the Daini-Atsumi Knoll. Journal of Geochemical Exploration, 95, 29-39.

Hirono, T., U. Tsunogai, K. Maegawa, T. Toki, M. Tanimizu, W. Soh, W. Lin, E.-C. Yeh, S.-R. Song, and C.-Y. Wang (2007) Chemical and isotopic characteristics of interstitial fluids within the Taiwan Chelungpu fault. Geochem. J., 41, 97-102.

Kim, Y.-S., N. Tanaka, F. Nakagawa, U. Tsunogai, M. Ueyama, and Y. Harazono (2007) Assessment of winter fluxes of CO2 and CH4 in boreal forest soils of central Alaska estimated by the profile method and the chamber method: a diagnosis of methane emission and implications for the regional carbon budget. Tellus, 59B, 223-233.

Hongo, Y., H. Obata, T. Gamo, M. Nakaseama , J. Ishibashi, U. Konno, S. Saegusa, S. Ohkubo and U. Tsunogai (2007) Rare Earth Elements in the hydrothermal system at Okinawa Trough back-arc basin. Geochem. J. 41, 1-15.

Kim, J.-H., M.-H. Park, U. Tsunogai, T.-J. Cheong, B.-J. Ryu, Y.-J. Lee, H.-C. Han, J.-H. Oh and H.-W. Chang (2007) Geochemical characterization of the organic matter, pore water constituents and shallow methane gas in the eastern part of the Ulleung Basin, East Sea (Japan Sea). Island Arc, 16, 93-104.

角皆 潤(2007)「同位体比測定」(日本化学会編「第5版実験化学講座第20-2巻「環境化学」p.256-265」(丸善)

角皆 潤(2007)「第6章:メタンハイドレートと地球環境」(地球化学講座第7巻「環境の地球化学」p.161-182)(倍風館)


Oba M., Sakata S. and Tsunogai U. (2006) Polar and neutral isopranyl glycerol ether lipids as biomarkers of archaea in near-surface sediments from the Nankai Trough. Organic Geochemistry 37, 1643-1654.
[doi link]

Yamada, K., Y. Ozaki, F. Nakagawa, S. Sudo, H. Tsuruta, and N. Yoshida (2006) Hydrogen and carbon isotopic measurements of methane from agricultural combustion: Implications for isotopic signatures of global biomass burning sources. J. Geophys. Res. 111, D16306, doi:10.1029/2005JD006750.

Nara, H., F. Nakagawa, and N. Yoshida (2006) Development of two-dimensional gas chromatography / isotope ratio mass spectrometry for the stable carbon isotopic analysis of C2-C5 non-methane hydrocarbons emitted from biomass burning. Rapid Commun. Mass Spectrom. 20, 241-247.

Inagaki, F., M.M.M. Kuypers, U. Tsunogai, J. Ishibashi, K. Nakamura, T. Treude, S. Ohkubo, M. Nakaseama, K. Gena, H. Chiba, H. Hirayama, T. Nunoura, K. Takai, B.B. J_rgensen, K. Horikoshi and A. Boetius (2006) Microbial community in a sediment-hosted CO2 lake of the southern Okinawa Trough hydrothermal system. Proc. Nat. Acad. Sci. U.S.A., 103, 14164-14169.
[doi: 10.1073/pnas.0606083103]

Konno, U., U. Tsunogai, F. Nakagawa, M. Nakaseama, J. Ishibashi, T. Nunoura, K. Nakamura (2006) Liquid CO2 venting on seafloor: Yonaguni IV Knoll hydrothermal system, Okinawa Trough. Geophys. Res. Lett. 33, L16607, doi:10.1029/2006GL026115.
[abstract] [doi

Toki, T., T. Gamo, and U. Tsunogai (2006) Origins of hydrocarbons at Sagara oil field, Central Japan. Island Arc 15, 285-291.

Gamo, T., J. Ishibashi, U. Tsunogai, K. Okamura, and H. Chiba (2006) Unique geochemistry of submarine hydrothermal fluids from arc-backarc settings of the western Pacific. In: Back-Arc Spreading Systems: Geological, Biological, Chemical and Physical Interactions (ed by D. Christie), Geophysical Monograph Serise 166, Americal Geophysical Union, p.147-161.
[contents] [abstract]

Arakawa, S., T. Sato, R. Sato, J. Zhang, T. Gamo, U. Tsunogai, A. Hirota, Y. Yoshida, R. Usami, F. Inagaki and C. Kato (2006) Molecular phylogenetic and chemical analyses of the microbial mats in deep-sea cold seep sediments at the northeastern Japan Sea. Extremophiles, 10, 311-319.

Saegusa, S., U. Tsunogai, F. Nakagawa, and S. Kaneko (2006) Development of a multi-bottle gas-tight fluid sampler WHATS II for Japanese submersibles/ROVs. Geofluids, 6, 234-240.

Nakagawa, T., K. Takai, Y. Suzuki, H. Hirayama, U. Konno, U. Tsunogai and K. Horikoshi (2006) Geomicrobiological exploration and characterization of a novel deep-sea hydrothermal system at the TOTO caldera in the Mariana Volcanic Arc. Environ. Microbiol. 8, 37-49.

角皆 潤中川書子笹川基樹亀山宗彦 (2006) 「安定同位体組成を指標に用いた大気-海洋間の物質循環解析」山中 勤 (編) : 環境循環系診断のための同位体トレーサー技術電子モノグラフ No. 2, 筑波大学陸域環境研究センター, 47-53
[PDF link: 188 kB]


Shakirov, R.B., A.I. Obzhirov, A.N. Salyuk, N. Biebow,V.E. Terekhova, U. Tsunogai and H. Shoji (2005) Classification of anomalous methane fields in the Sea of Okhotsk. Polar Meteorology and Glaciology 19, 50-66.

Tsunogai, U., F. Nakagawa, T. Gamo and J. Ishibashi (2005) Stable isotopic compositions of methane and carbon monoxide in the Suiyo hydrothermal plume, Izu-Bonin arc: Tracers for microbial consumption/production. Earth Planet Sci. Lett. 237, 326-340.
[doi link]

Kawagucci, S., U. Tsunogai, S. Kudo, F. Nakagawa, H. Honda, S. Aoki, T. Nakazawa and T. Gamo (2005) An analytical system for determining δ17O in CO2 using continuous flow-isotope ratio MS. Anal. Chem. 77, 4509 -4514.
[abstract] [doi link]

Kameyama, S., U. Tsunogai, T. Gamo, J. Zhang, M. Suzuki, and Y. Koyama (2005) Geochemical studies on submarine groundwater discharges in Toyama Bay using methane as a tracer. Chikyukagaku (Geochemistry) 39, 131-140 (in Japanese with English abstract).
[abstract] [PDF link: 401 kB] [HUSCAP abstract] [HUSCAP PDF link]

Ishibashi, J., K. Nakamura, K. Okamura, K. Shitashima, T. Toki, U. Tsunogai (2005) Development of sampling devices and monitoring systems to study the geochemical environment within active hydrothermal fields. Oceanogr. Japan, 14, 251-266 (in Japanese with English abstract).

Tsunogai, U., F. Nakagawa, and K. Okamura (2005) Geochemical studies on the microbial activities within the Suiyo seamount hydrothermal plume, Izu-Bonin arc. Oceanogr. Japan, 14, 279-295 (in Japanese with English abstract).

Komatsu, D.D., U. Tsunogai, J. Yamaguchi, F. Nakagawa (2005) Stable carbon isotopic analysis of atmospheric methyl chloride using CF-IRMS by using selective removal of unsaturated hydrocarbons. Rapid Commun. Mass Spectrom. 19, 477-483.

Nakagawa, F., U. Tsunogai, D.D. Komatsu, K. Yamada, N. Yoshida, J. Moriizumi, K. Nagamine, T. Iida, Y. Ikebe (2005) Automobile exhaust as a 13C- and D-enriched source of atmospheric methane in urban areas. Organic Geochem. 36, 727-738.
[doi link]

石村豊穂・井尻 暁・阿部恒平・角皆 潤 (2005)「北海道,中新統望来層におけるシロウリガイ属化石をともなう石灰質団塊の特徴(和文口絵)」地質学雑誌 第111巻、第3号、7-8.
Ishimura, T., A. Ijiri, K. Abe, and U. Tsunogai (2005) Characteristics of calcareous concretions with Calyptogena sp. in the Miocene Morai Formation, Hokkaido, Journal of Geological Society of Japan 111, 3, VII-VIII (in Japanese).


Ishimura, T., U. Tsunogai, and T. Gamo (2004) Stable carbon and oxygen isotopic determination of sub-microgram quantities of CaCO3 to analyze each individual foraminiferal shell. Rapid Commun. Mass Spec., 18, 2883-2888.
[abstract] [doi link]

Inagaki, F., U. Tsunogai, M. Suzuki, A. Kosaka, H. Machiyama, K. Takai, T. Nunoura, K.H. Nealson, and K. Horikoshi (2004) Characterization of C1-metabolizing Prokaryotic Communities by pmoA, mmoX, mxaF, mcrA and 16S rRNA Genes in Methane Seep Habitats at the Kuroshima Knoll, the Southern Ryukyu Arc. Appl. Enviorn. Microbiol., 70, 7445-7455.
[abstract] [doi link]

Toki, T., U. Tsunogai, T. Gamo, S. Kuramoto, and J. Ashi (2004) Detection of low-chloride fluids beneath a cold seep field on the Nankai accretionary wedge off Kumano, south of Japan. Earth Planet. Sci. Lett., 228, 37-47.
[doi link]

Gamo, T., H. Masuda, T. Yamanaka, K. Okamura, J. Ishibashi, E. Nakayama, H. Obata, K. Shitashima, Y. Nishio,H. Hasumoto,M. Watanabe, K. Mitsuzawa, N. Seama, U. Tunogai, F. Kouzuma and Y. Sano, Discovery of a new hydrothermal venting site in the southernmost Mariana Arc:Al−rich hydrothermal plumes and white smoker activity associated with biogenic methane. Geochem. J., 38, 527-534.
[abstract] [PDF link: 137 kB] [doi:10.2343/geochemj.38.527]

Takai, K., T. Gamo, U. Tsunogai, N. Nakayama, H. Hirayama, K. Nealson, and K. Horikoshi (2004) Evidence for a hydrogen-based hyperthermophilic subsurface lithoautotrophic microbial ecosystem (HyperSLiME) beneath an active deep-sea hydrothermal field. Extremophiles, 8, 269-282.
[doi link]

Nakagawa, F., U. Tsunogai, N. Yoshida, and T. Gamo (2004) Stable isotopic compositions and fractionations of carbon monoxide at coastal and open ocean stations in the Pacific. J. Geophys. Res., 109, C06016, doi:10.1029/2001JC001108.
[abstract] [doi: 10.1029/2001JC001108]

Jeong, K.S., J.H. Cho, S.R. Kim, S. Hyun and U. Tsunogai (2004) Geophysical and geochemical observations on actively seeping hydrocarbon gases on the south-eastern Yellow Sea continental shelf. Geo-Marine Letters, 24, 53-62 .
[doi link]


Shinohara, M., E. Araki, M. Kamata, M. Kinoshita, M. Kyo, K. Kuroki, Y. Kosuge, S. Kobayashi, S. Konno, T. Goto, S. Saito, M. Suzuki, T. Takahashi, K. Tadokoro, U. Tsunogai, K. Tezuka, K. Namba, S. Nishi, R. Hino, H. Mikada, N. Morita, C. Yoshida and H. Ito (2003) Long-term monitoring using deep seafloor boreholes in seismogenic zone. Bull. Earthquake Res. Inst. 78, 205-218.
[PDF link: 6.1 MB]

Tsunogai, U., Y. Hachisu, D.D. Komatsu, F. Nakagawa, T. Gamo and K. Akiyama (2003) An updated estimation of the stable carbon and oxygen isotopic compositions of automobile CO emissions. Atmospheric Environ., 37, 4901-4910.
[doi link]

Toki, T., U. Tsunogai, T. Gamo, and M. Minakawa (2003) Geochemical exploration of volcanic activity on the sea floor using CH4 as a tracer: Miyakejima volcano, Japan. Bull. Volcano. Soc. Japan, 48, 63-67 (in Japanese with English abstract).

Hikida, Y., S. Suzuki, Y. Togo, A. Ijiri (2003) An exceptionally well-preserved seep community from the Cretaceous Yezo forearc basin in Hokkaido, northern Japan, Paleontological Research, 7, 329-342 .

Ijiri, A., U. Tsunogai and T. Gamo (2003) Simple method for oxygen-18 determination of milligram quantities of water using NaHCO3 reagent, Rapid Commun. Mass Spectrom. 17, 1472-1478.
[abstract] [doi link]

Yamanaka, T., C. Mizota, H. Satake, F. Kouzuma, T. Gamo, U. Tsunogai, T. Miwa, K. Fujioka (2003) Lithotrophic animal community atop of the serpentine seamount: a deep-sea mussel Bathymodiolus sp. with both methanotrophic and thiotrophic endosymbionts, Geomicrobiology J. 20, 3, 185-197.

Tsunogai, U., T. Toki, N. Nakayama, T. Gamo, H. Kato and S. Kaneko (2003) WHATS: a new multi-bottle gas-tight sampler for sea-floor vent fluids. Chikyukagaku (Geochemistry) 37, 3, p.101-109 (in Japanese with English abstract).
[contents] [abstract (ciNii)] [PDF link (ciNii)] [abstract (HUSCAP)] [PDF link (HUSCAP)]

Nakagawa, F., U. Tsunogai, N. Yoshida, and D.D. Adams (2003) Stable isotopic compositions of bacterial light hydrocarbons in marginal marine sediments, In: Land and marine hydrogeology (eds. M. Taniguchi, K. Wang, T. Gamo), Elsevier Science, 141-150.
[doi link]

Ijiri, A., T. Sakamoto, U.Tsunogai, T. Gamo, S. Saito, and K. Suehiro (2003) Authigenic carbonates at sites 1150 and 1151, In: Proc. ODP Scientific Results, Vol. 186 (eds. Suehiro K., I.S. Sackes, I.S. Acton, and M. Oda), Ms. 186SR-109.
[PDF link (113 kB)]

Yamada, K., Y., Ozaki, F. Nakagawa, M. Tanaka, N. Yoshida (2003) An improved method for measurement of the hydrogen isotope ratio of atmospheric methane and its application to a Japanese urban atmosphere, Atmospheric Environment, 37, 1975-1982.


Tsunogai, U., F. Nakagawa, D.D. Komatsu, and T. Gamo (2002) Stable carbon and oxygen isotopic analysis of atmospheric carbon monoxide using CF-IRMS by isotope-ratio monitoring of CO, Anal. Chem., 74, 5695-5700.
[abstract] [doi link]

Nakagawa, F., N. Yoshida, A. Sugimoto, E. Wada, T. Yoshioka, S. Ueda, P. Vijarnsorn (2002) Stable isotope and radiocarbon compositions of methane emitted from tropical rice paddies and swamps in southern Thailand, Biogeochemistry, 61, 1-19.
[doi link]

Nakagawa, F., N. Yoshida, Y. Nojiri, V.N. Makarov (2002) Production of methane from alasses in eastern Siberia; Implications from its 14C and stable isotopic compositions, Global Biogeochemical Cycles, 16, NO. 3, 1041, doi:10.1029/2000GB001384.
[doi link]

Yamada, K., M. Tanaka, F. Nakagawa, N. Yoshida (2002) On-line measurement of intramolecular carbon isotope distribution of acetic acid by continuous-flow isotope ratio mass spectrometry, Rapid Communications in Mass Spectrometry, 16, 1059-1064
[doi link]

Saito, T., U. Tsunogai, K. Kawamura, T. Nakatsuka, and N. Yoshida (2002) Stable carbon isotopic compositions of light hydrocarbons over the western North Pacific and implication for their photochemical ages, J. Geophys. Res., 107, D4, doi: 10.1029/2000JD000127.
[abstract] [doi link]

Toyoda, S., N. Yoshida, T. Miwa, Y. Matsui, H. Yamagishi, U. Tsunogai, Y. Nojiri, N. Tsurushima (2002) Production mechanism and global budget of N2O inferred from its isotopomers in the western North Pacific, Geophys. Res. Lett., 29, 3, 10.1029/2001GL014311.
[doi link]

Tsunogai, U., N. Yoshida and T. Gamo (2002) Carbon isotopic evidence for methane using sulfate reduction in sediment beneath seafloor cold seep vents at Nankai Trough, Marine Geol., 187, 145-160.
[abstract] [doi link]

Henry, P., S. Lallemant, K. Nakamura, U. Tsunogai, S. Mazzotti, and K. Kobayashi (2002) Surface expression of fluid venting at the toe of the Nanakai wedge and implication for flow paths. Marine Geol. 187, 119-143.
[doi link]

Tsunogai, U.(2002) Stable carbon isotopic studies of volatile components in seafloor venting hydrothermal and cold seep fluids, using CF-IRMS, Chikyukagaku (Geochemistry) 36, 51-63 (in Japanese with English abstract).
[contents] [abstract (ciNii)] [PDF link (ciNii)] [abstract (HUSCAP)] [PDF link (HUSCAP)]

Fujioka, K., T. Yamanaka, T. Gamo, F. Inagaki, T. Miwa & H. Sato (2002) An introduction to serpentinite biosphere in the Mariana forearc - Capsule of the deep subsurface biosphere from the Chamorro Seamount - , Bull. Earthquake Res. Inst., 76, No. 3, 417-424.


Hashimoto, J. , S. Ohta,T. Gamo, H. Chiba, T. Yamaguchi, S. Tsuchida, T. Okudaira, H. Watabe, T. Yamanaka, and M. Kitazawa( 2001) First hydrothermal vent communities from the Indian Ocean discovered. Zoological Science, 18, 717-721 .

Numata, M. , N. Nakamura, and T. Gamo (2001) Precise measurement of chlorine stable isotopic ratios by thermal ionization mass spectrometry. Geochem. J., 35, 89-100 .

K. Okamura, H. Kimoto, K. Saeki, J. Ishibashi, H. Obata, M. Maruo, T. Gamo, E. Nakayama, Y. Nozaki (2001) Development of a deep-sea in situ Mn analyzer and its application for hydrothermal plume observation. Mar. Chem, 76, 17-26 .

Gamo, T., H. Chiba, T. Yamanaka, T. Okudaira, J. Hashimoto, S. Tsuchida, J. Ishibashi, S. Kataoka, U. Tsunogai, F. Kouzuma, K. Okamura, Y. Sano, R. Shinjo (2001), Chemical characteristics of newly discovered black-smoker fluid venting and its effluent dispersion at the Rodriguez Triple Junction, Indian Ridge, Earth Planetary Science Letters, 193, 371-379.
[doi link]

Toki, T., T. Gamo, T. Yamanaka, J. Ishibashi, U. Tsunogai, and O. Matsubayashi (2001) Methane migration from the Nankai Trough accretionary prism. Bull. Geol. Surv. Japan, 52, p. 1-8 (in Japanese with English abstract).
[PDF link (900 kB)]

Gamo, T., N. Momoshima, S. Tolmachyov (2001) Recent upward shift of the deep convection system in the Japan Sea, as inferred from the geochemical tracers tririum, oxygen, and nutrients. Geophys. Res. Lett., 28, 4143-4146.


Tsunogai, U., F. Nakagawa, Y. Hachisu and N. Yoshida (2000) Stable carbon and oxygen isotopic analysis of carbon monoxide in natural waters, Rapid Commun. Mass Spectrom. 14, 1507-1512.

Tsunogai, U., N. Yoshida, J. Ishibashi and T. Gamo (2000) Carbon isotopic distribution of methane in deep-sea hydrothermal plume, Myojin Knoll Caldera, Izu-Bonin arc: Implications for microbial methane oxidation in ocean and applications to heat flux estimation, Geochim. Cosmochim. Acta 64, 2439-2452.
[doi: 10.1016/S0016-7037(00)00374-4]

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