A. 原著論文(レフリーあり)

A165) Nakayama, N., Tokieda, T., Suzuki, A., Kim, T-J., Gamo, T., and Obata, H. (2016): Size fractionation of nanoparticulate metal sulfides in oxic water of Lake Teganuma, Japan. Geochem. J., 50, doi:10.2343/geochemj.2.0408.

A164) Aoyama, M., Kajino, M., Tanaka, T.Y., Sekiyama, T.T., Tsumune, D., Tsubono, T., Hamajima, Y., Inomata, Y., and Gamo, T. (2016): 134Cs and 137Cs in the North Pacific Ocean derived from the March 2011 TEPCO Fukushima Dai-ichi Nuclear Power Plant accident, Japan: Part Two --- Estimation of 134Cs and 137Cs inventories in the North Pacific Ocean. J. Oceanogr., 72, 67-76.

A163) Yamazaki, E., Yamashita, N., Taniyasu, S., Miyazawa, Y., Gamo, T., Ge, H., and Kannan, K. (2015): Emission, Dynamics and Transport of Perfluoroalkyl Substances from Land to Ocean by the Great East Japan Earthquake in 2011. Environ. Sci. Tech., 49, 11421-11428, doi: 10.1021/acs.est.5b01687.

A162) Lee, J-M., Boyle, E. A., Gamo T., Obata, H., Norisuye, K., and Echegoyen, Y. (2015): Impact of anthropogenic Pb and ocean circulation on the recent distribution of Pb isotopes in the Indian Ocean. Geochim. Cosmochim. Acta, 170, 126-144.

A161) Ishibashi, J., Tsunogai, U., Toki, T., Ebina, N., Gamo, T., Sano, Y., Masuda, H., Chiba, H. (2015): Chemical composition of hydrothermal fluids in the central and southern Mariana Trough backarac basin. Deep-Sea Res. II., 121, 126-136.

A160) Gamo, T., Okamura, K., Hatanaka, H., Hasumoto, H., Komatsu, D., Chinen, M., Mori, M., Tanaka, J., Hirota, A., Tsunogai, U., Tamaki, K. (2015): Hydrothermal plumes in the Gulf of Aden, as characterized by light transmission, Mn, Fe, CH4 and d13C-CH4 anomalies. Deep-Sea Res. II., 121, 62-70.

A159) The GEOTRACES Group (Mawji, E. et al., total 136 authors) (2015): The GEOTRACES Intermediate Data Product 2014. Mar. Chem., 177, 1-8.

A158) Kim, T-J., Obata, H., and Gamo, T. (2015): Dissolved Zn and its speciation in the northeastern Indian Ocean and the Andaman Sea. Frontiers Mar. Sci., 2, doi: 10.3389/fmars.2015.00060.

A157) Kim, T-J., Obata, H., Kondo, Y., Ogawa, H., Gamo, T. (2015): Distribution and speciation of dissolved zinc in the western North Pacific and its adjacent seas. Mar. Chem., 173, 330-341.

A156) Nakayama, H., Shirai, K., Sano, Y., Gamo, T., Obata, H. (2015): Sulfides in oxic seawater over the submarine hydrothermal area of Kikai Caldera south of Kyushu Island, Japan. Geochem. J., 49, e1-e7.

A155) Kim, T-J., Obata, H., Gamo, T., Nishioka, J. (2015): Sampling and onboard analytical methods for determining subnanomolar concentrations of zinc in seawater. Limnol. Oceanogr. Methods, 13, 30-39.

A154) Yamaoka, K., Hong, E., Ishikawa, T., Gamo, T., Kawahata, H. (2015): Boron isotopic geochemistry of vent fluids from arc/back-arc seafloor hydrothermal systems in the western Pacific. Chem. Geol., 392, 9-18.

A153) Suzuki, A., Obata, H., Okubo, A., Gamo, T. (2014): Precise determination of dissolved platinum in seawater of the Japan Sea, the Sea of Okhotsk, and the western North Pacific. Mar. Chem., 166, 114-121.

A152) Echegoyen, Y., Boyle, E.A., Lee, J.M., Gamo, T., Obata, H., Norisuye, K. (2014): Recent distribution of lead in the Indian Ocean reflects the impact of regional emissions. PNAS, 111, 15328-15331.

A151) Kawagucci, S., Narita, T., Obata, H., Ogawa, H., and Gamo, T. (2014): Molecular hydrogen and carbon monoxide in seawater in an area adjacent to Kuroshio and Honshu Island in Japan. Mar. Chem., 164, 75-83.

A150) Gamo, T., Nakayama, N., Takahata, N., Sano, Y., Zhang, J., Yamazaki, E., Taniyasu. S., and Yamashita, N. (2014): The Sea of Japan and its Unique Chemistry Revealed by Time-Series Observations over the Last 30 Years. Monogr. Environ. Earth Planets, 2(1), 1-22.

A149) Gamo, T. (2014): Excess 222Rn in the bottom layer of the Japan Sea and their implication for bottom water dynamics. Prog. Oceanogr., 121, 94-97.

A148) Amakawa, H., Tazoe, H., Obata, H., Gamo, T., Sano, Y., and Shen, C-C. (2013): Neodymium isotopic composition and concentration in the Southwest Pacific Ocean. Geochem. J., 47, 409-422.

A147) Kawagucci, S., Ueno, Y., Takai, K., Toki, T., Ito, M., Inoue, K., Makabe, A., Yoshida, N., Muramatsu, Y., Takahata, N., Sano, Y., Narita, T., Teranishi, G., Obata, H., Nakagawa, S., Nunoura, T., and Gamo, T. (2013): Geochemical origin of hydrothermal fluid methane in sediment-associated fields and its relevance to the geographical distribution of whole hydrothermal circulation. Chem. Geol., 339, 213-225.

A146) Okubo, A., Obata, H., Gamo, T., and Yamada, M. (2012): 230Th and 232Th distributions in the mid-latitudes of the North Pacific Ocean: Effect of bottom scavenging. Earth Planet. Sci. Lett., 339/340, 139-150.

A145) Gamo, T., Tsunogai, U., Hirota, A., Nakayama, N., Kang, D-J., and Kim, K-R. (2012): First measurements of methane and its carbon isotope ratio in the Japan Sea (East Sea). Mar. Chem., 128/129, 92-99.

A144) Gamo, T. (2011): Dissolved oxygen in the bottom water of the Sea of Japan as a sensitive alarm for the global climate change. TrAC Trends Anal. Chem., 30, 1308-1319.

A143) Toki, T., Maegawa, K., Tsunogai, U., Kawagucci, A., Takahata, N., Sano, Y., Ashi, J., Kinoshita, M. and Gamo, T. (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 (Yujiro Ogawa, Ryo Anma, and Yildirim Dilek eds.), Modern Approaches in Solid Earth Sciences, Vol. 8, Springer, 247-262.

A142) Kawagucci, S., H. Chiba, J. Ishibashi, T. Yamanaka, T. Toki, Y. Muramatsu, Y. Ueno, A. Makabe, K. Inoue, N. Yoshida, S. Nakagawa, T. Nunoura, K. Takai, N. Takahata, Y. Sano, T. Narita, G. Teranishi, H. Obata, T. Gamo (2011): Hydrothermal fluid geochemistry at the Iheya North field in the mid-Okinawa Trough: Implication for origin of methane in subseafloor fluid circulation systems. Geochem. J., 45, 109-124.

A141) Tazoe, H., Obata, H., Amakawa, H. & Gamo, T. (2011): Surface cerium isotopic composition in the Pacific and Southern Oceans. Geochem. Geophys. Geosyst.,  12, Q04004, doi: 10.1029/2010GC003342.

A140) Saito, T., Stein, O., Tsunogai, U., Kawamura, K., Nakatsuka, T., Gamo, T., and Yoshida, N. (2011): Stable carbon isotope ratios of ethane over the north Pacific: shipboard measurements and global chemical transport modeling. J. Geophys. Res., 116, D02308, doi: 10.1029/2010JD014602.

A139) Nakayama, N., Ashi, J., Tsunogai, U., Gamo, T., Tanahashi, M. (2010): Sources of pore water in a Tanegashima mud volcano inferred from chemical and stable isotope studies. Geochem. J., 44, 561-569.

A138) Kawagucci, S., Shirai, K., Lan, T-F., Takahata, N., Tsunogai, U., Sano, Y., and Gamo, T. (2010): Gas geochemical characteristics of hydrothermal plumes at the HAKUREI and JADE vent sites, the Izena Cauldron, Okinawa Trough. Geochem. J., 44, 507-518.

A137) Gamo, T., Tsunogai, U., Ichibayashi, S., Chiba, H., Obata, H., Oomori, T., Noguchi, T., Baker, E.T., Doi, T., Maruo, M., and Sano, Y. (2010): Microbial carbon isotope fractionation to produce extraordinarily heavy methane in aging hydrothermal plumes over the southwestern Okinawa Trough. Geochem. J., 44, 477-487.

A136) Kawagucci, S., T. Toki, J. Ishibashi, K. Takai, M. Ito, T. Oomori, and T. Gamo (2010): Isotopic variation of molecular hydrogen in 20º-375ºC hydrothermal fluids as detected by a new analytical method. J. Geophys. Res., 115, G03021, doi:10.1029/2009JG001203.

A135) Ijiri, A., Tsunogai, U., Gamo, T., Nakagawa, F., Sakamoto, T., Saito, S. (2009): Enrichment of adsorbed methane in authigenic carbonate concretions of the Japan Trench. Geo-Mar. Lett., 29, 301-308, doi: 10.1007/s00367-009-0143-9.

A134) Oka, A., Hasumi, H., Obata, H., Gamo, T. & Yamanaka, Y. (2009): Study on vertical profiles of rare earth elements by using an ocean general circulation model. Global Biogeochem. Cycles, 23, GB4025, doi:10.1029/2008GB003353.

A133) Hara, Y., Obata, H., Doi, T., Hongo, Y., Gamo, T., Takeda, S. and Tsuda, A. (2009): Rare earth elements in seawater during an iron-induced phytoplankton bloom of the western subarctic Pacific (SEEDS-II). Deep-Sea Res. II., 56, 2839-2851.

A132) Saito, T., K. Kawamura, U. Tsunogai, T.-Y. Chen, H. Matzueda, 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, J. Geophys. Res., 114, D11303, doi: 10.1029/2008JD011388.

A131) Ozaki, H., Obata, H., Naganobu, M. & Gamo, T. (2009): Long-term bottom water warming in the north Ross Sea. J. Oceanogr., 65, 235-244.

A130) Kumagai, H., Nakamura, K., Toki, T., Morishita, T., Okino, K., Ishibashi, J., Tsunogai, U., Kawagucci, S., Gamo, T., Shibuya, T., Sawaguchi, T., Neo, N., Joshima, M., Sato, T. and Takai, K. (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.

A129) Kawagucci, S., Okamura, K., Kiyota, K., Tsunogai, U., Sano, Y., Tamaki, K., & Gamo, T. (2008): Methane, manganese, and helium-3 in newly discovered hydrothermal plumes over the Central Indian Ridge, 18°–20°S, Geochem. Geophys. Geosyst., 9, Q10002, doi:10.1029/2008GC002082.

A128) Toki, T., U. Tsunogai, J. Ishibashi, M. Utsumi, and T. Gamo (2008): Methane enrichment in low-temperature hydrothermal fluids from the Suiyo Seamount in the Izu-Bonin Arc of the western Pacific Ocean, J. Geophys. Res., 113, B08S13, doi:10.1029/2007JB005476.

A127) Takai, K., T. Nunoura, J. Ishibashi, J. E. Lupton, R. Suzuki, H. Hamasaki, Y. Ueno, S. Kawagucci, T. Gamo, Y. Suzuki, H. Hirayama, and K. Horikoshi (2008), Variability in the microbial communities and hydrothermal fluid chemistry at the newly-discovered Mariner hydrothermal field, southern Lau Basin, J. Geophys. Res., 113, G02031, doi:10.1029/2007JG000636.

A126) Nakayama, N., Yamanaka, Y. & Gamo, T. (2008): The O2 utilization rate and isotopic fractionation in the deep water of the Philippine Sea. J. Oceanogr., 64, 451-457.

A125) Doi, T., Takano, M., Okamura, K., Ura, T., and Gamo, T. (2008): In-situ survey of nanomolar manganese in seawater around a volcanic crator at Teishi Knoll using an autonomous underwater vehicle. J. Oceanogr., 64, 471-477.

A124) Zhang, Y., Obata, H. & Gamo, T. (2008): Silver in the Tokyo Bay estuarine waters and Japanese rivers. J. Oceanogr., 64, 259-265.

A123) Takahata, N., Sano, Y., Horiguchi, K., Shirai, K. & Gamo, T. (2008): Helium isotopes of seawater in the Japan Sea. J. Oceanogr., 64, 293-301.

A122) Yamashita, N., Taniyasu, S., Petrick, G., Wei, S., Gamo, T., Lam, P.K.S., Kannan, K. (2008): Perfluorinated acids as novel chemical tracers of global circulation of ocean waters, Chemosphere, 70, 1247-1255.

A121) Henderson, G., Anderson, R.F. and 21 co-authors (2007): GEOTRACES --- An international study of the global marine biogeochemical cycles of trace elements and their isotopes. Chemie der Erde Geochemistry, 67, 85-131.

A120) Okubo, A., Obata, H., Luo, S., Gamo, T., Yamamoto, Y., Minami, H., and Yamada, M. (2007): Particle flux in the twilight zone of the eastern Indian Ocean: A constraint from 234U-230Th and 228Ra-228Th disequilibria. Deep-Sea Res. I, 54, 1758-1772.

A119) Kawagucci, S., U. Tsunogai, S. Kudo, F. Nakagawa, H.Honda, S.Aoki, T.Nakazawa, Makoto Tsutsumi, and T.Gamo (2007): Long-term observation of mass-independent oxygen isotope anomaly in stratospheric CO2. Atmospheric Chemistry and Physics - Discussion, 7, 15723-15737.

A118) Nakayama, N., Obata, H. & Gamo, T. (2007): Consumption of dissolved oxygen in the deep Sea of Japan, giving a precise isotopic fractionation factor. Geophys. Res. Lett., 34, L20604, doi: 10.1029/2007GL029917.

A117) Toki, T., Tsunogai, U., Gamo, T., Tanahashi, M. (2007): Geochemical study of pore fluid in surface sediment at the Daini-Atsumi Knoll. J. Geochem. Explorat., 95, 29-39.

A116) Gamo, T., Okamura, K., Mitsuzawa, K., Asakawa, K. (2007): Tectonic pumping: earthquake-induced chemical flux detected in situ by a submarine cable experiment in Sagami Bay, Japan. Proc. Japan Acad. Ser B., 83, 199-204.

A115) Goto, S., Gamo, T., Chiba, H., Fujioka, K. & Mitsuzawa K. (2007): Contribution of heat outputs from high- and low-temperature hydrothermal sources to the neutrally buoyant plume at the TAG hydrothermal mound, Mid-Atlantic Ridge. Earth, Planets and Space, 59, 1141-1146.

A114) Tazoe, H., Obata, H. & Gamo, T. (2007): Determination of cerium isotope ratios in geochemical samples using oxidative extraction technique with chelating resin. Journal of Analytical Atomic Spectrometry, 22, 616-622.

A113) Hongo, Y., Obata, H., Gamo, T., Nakashima, M., Ishibashi, J., Konno, U., Saegusa, S., Ohkubo, S. and Tsunogai, U. (2007): Rare earth elements in the hydrothermal system at Okinawa Trough back-arc basin. Geochem. J., 41, 1-15.

A112) Nishida, S. & Gamo, T. (2007): Biogeochemistry and biodiversity in the Sulu Sea. Deep Sea Res. II, 54, 1-3.

A111) Gamo, T., Kato, Y., Hasumoto, H., Kakiuchi, H., Momoshima, N., Takahata, N., and Sano, Y. (2007): Geochemical implications for the mechanism of deep convection in a semi-closed marginal basin: Sulu Sea. Deep Sea Res. II, 54, 4-13.

A110) Okubo, A., Obata, H., Gamo, T., Minami, H., and Yamada, M. (2007): Thorium isotopes in the Sulu Sea. Deep-Sea Res. II, 54, 50-59.

A109) Tazoe, H., Otaba, H., Amakawa, H., Nozaki, Y., & Gamo, T. (2007): Precise determination of the Ce isotopic compositions of surface seawater in the Northwest Pacific Ocean and Tokyo Bay. Mar. Chem., 103, 1-14.

A108) Gamo, T., J. Ishibashi, U. Tsunogai, K. Okamura, 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. M. Christie, C. R. Fisher, S-M. Lee, and S. Givens), American Geophysical Union, 147-161.

A107) Toki, T., Gamo, T., Tsunogai, U.: Origins of hydrocarbons at Sagara oil field, central Japan. The Island Arc, 15, 285-291 (2006).

A106) Arakawa, S., T. Sato, R. Sato, J. Zhang, T. Gamo, U. Tsunogai, A. Hirota, Y. Yoshida, R. Usami, F. Inagaki, and C. Kato: Molecular phylogenetic and chemical analyses of the microbial mats in deep-sea cold seep sediments at the northeastern Japan Sea. Extremophiles, 10, 311-319 (2006).

A105) Chen, C-T. A., W-P. Hou1, T. Gamo and S. L. Wang: Carbonate related parameters of subsurface waters in the West Philippine, South China and Sulu Seas. Mar. Chem., 99, 151-161 (2006).

A104) Gamo, T.: Oceanographic studies using dissolved gases as chemical tracers. Oceanography in Japan, 15, 127-142 (2006). (in Japanese with English abstract and figures)

A103) Horii, Y., Petrick, G., Okada, M., Amano, K., Katase, T., Gamo, T., and Yamashita, N.: Congerner-specific isotopic analysis of 18 PCB products using two dimensional GC/IRMS. Bunseki Kagaku, 54, 361-372 (2005). (in Japanese with English abstract and figures)

A102) Horii, Y., Kannan, K., Petrick, G., Gamo, T., Falandysz, J., and Yamashita, N.: Congener-specific carbon isotopic analysis of technical PCB and PCN mixtures using two-dimensional gas chromatography-isotope ratio mass spectrometry. Environ. Sci. Technol., 39, 4206-4212 (2005).

A101) Yamashita, N., Kannan, K., Taniyasu, S., Horii, Y., Petrick, G., and Gamo, T.: A global survey of perfluorinated acids in oceans. Marine Pollution Bulletin, 51, 658-668 (2005).

A100) Tsunogai, U., F. Nakagawa, T. Gamo, and J. Ishibashi: 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 (2005).

A99) Kameyama, S., Tsunogai, U., Gamo, T., Zhang, J., Suzuki, M., and Koyama Y. (2005): Geochemical studies on submarine groundwater discharges in Toyama Bay using methane as a tracer. Chikyukagaku, 39, 131-140. (in Japanese with English abstract and figures)

A98) S. Kawagucci, U. Tsunogai, S. Kudo, F. Nakagawa, H. Honda, S. Aoki, T. Nakazawa, T. Gamo (2005): An analytical system for determining d17O in CO2 using continuous flow-isotope ratio MS. Anal. Chem., 77, 4509-4514.

A97) T. Ishimura, 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 Comm. Mass Spectrom., 18, 2883-2888.

A96) K. Okamura, H. Hatanaka, H. Kimoto, M. Suzuki, Y. Sohrin, E. Nakayama, T. Gamo, and J. Ishibalshi (2004): Development of an in situ manganese analyzer using micro-diaphragm pumps and its application to time series observation in a hydrothermal field at Suiyo seamount. Geochem. J., 38, 635-642.

A95) Gamo, T., Masuda, H., Yamanaka, T., Okamura, K., Ishibashi, J., Nakayama, E., Obata, H., Shitashima, K., Nishio, Y., Hasumoto, H., Watanabe, M., Mitsuzawa, K., Seama, N., Tsunogai, U., Kouzuma, F., and Sano, Y. (2004): 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.

A94) T. Toki, U. Tsunogai, T. Gamo, S. Kuramoto, J. Ashi (2004) Detection of low-chloride fluids benearth a cold seep field on the Nankai accretionary wedge off Kumano, south of Japan. Earth Planet. Sci. Lett., 228, 37-47.

A93) Yamashita, N., Kannan, K., Taniyasu, S., Horii, Y., Okazasa, T., Petrick, G., and Gamo, T. (2004) Analysis of perfluorinated acids at parts-per-quadrillion levels in seawater using liquid chromatography-tandem mass spectrometry. Environ. Sci. Technol., 38, 5522-5528.

A92) 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.

A91) 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.

A90) 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.

A89) T. Tokunaga, T. Nakata, K. Mogi, M. Watanabe, J. Shimada, J. Zhang, T. Gamo, M. Taniguchi, K. Asai, & H. Saegusa: Detection of submarine fresh groundwater discharge and its relation to onshore groundwater flow system: An example from offshore Kurobe alluvial fan. J. Groundwater Hydrol., 45, 133-144 (2003).(in Japanese with English abstract)

A88) Y.W. Watanabe, M. Wakita, N. Maeda, T. Ono, T. Gamo: Synchronous bidecadal periodic changes of oxygen, phosphate and temperature between the Japan Sea deep water and the North Pacific intermediate water. Geophys. Res. Lett., 30 (24), 2273, doi: 10.1029/2003GL018338, 2003.

A87) T. Gamo and G. Glasby: Hydrothermal activity in coastal zones. In: Land and Marine Hydrogeology (M. Taniguchi, K. Wang and T. Gamo eds.), Elsevier, 151-163 (2003).

A86) U. Tsunogai, Y. Hachisu, D.D. Komatsu, F. Nakagawa, T. Gamo, K. Akiyama: An updated estimation of the stable carbon and oxygen isotopic compositions of automobile CO emissions. Atmos. Environ., 37, 4901-4910 (2003).

A85) T. Yamanaka, C. Mizota, H. Satake, F. Kouzuma, T. Gamo, U. Tsunogai, T. Misa, and K. Fujioka: Stable isotope evidence for a putative endosymbiont-based lithographic Bathymodiolus sp. mussel community atop a serpentine seamount. Geomicrobiol. J., 20, 185-197 (2003).

A84) T. Yamanaka, C. Mizota, Y. Fujiwara, H. Chiba, J. Hashimoto, T. Gamo, and T. Okudaira: Sulfur-isotopic composition of the deep-sea mussel Bathymodiolus marisindicus from currently active hydrothermal vents in the Indian Ocean. J. Mar. Biol. Ass. U.K., 83, 841-848 (2003).

A83) A. Ijiri, U. Tsunogai. & T. Gamo: A simple method for oxygen-18 determination of milligram quantities of water using NaHCO3 reagent. Rapid Comm. Mass Spectrom., 17, 1472-1478 (2003).

A82) T. Gamo: Geochemical studies of submarine hydrothermal systems of back-arc basins and mid-oceanic ridges. Chikyukagaku (Geochemistry), 37, 111-131 (2003). (in Japanese with English abstract and figures)

A81) U. Tsunogai, T. Toki, N. Nakayama, T. Gamo, H. Kato, and S. Kaneko: WHATS: a new multi-bottle gas-tight sampler for sea-floor vent fluids, Chikyukagaku (Geochemistry), 37, 101-109 (2003). (in Japanese with English abstract and figures)

A80) T. Toki, U. Tsunogai, T. Gamo, & M. Minakawa: Geochemical exploration of volcanaic activity on the sea floor using CH4, as a tracer: Miyakejima Volcano, Izu-Bonin Arc, Japan. Bull. Volcanol. Soc. Jpn., 4863-67 (2003). (in Japanese with English abstract)

A79) Nakayama, E., M. Maruo, H. Obata, K. Isshiki, K. Okamura, T. Gamo, H. Kimoto, T. Kimoto and H. Karatani: Anomalies of dissolvable iron and manganese accompanying seismic activities in the Japan Trench. In: Marine Environment: The Past, Present and Future, ed. by Chen-Tung Arthur Chen, The Fuwen Press, Kaohsiung, Taiwan, p. 345-355 (2002).

A78) J. Ishibashi, M. Sato, Y. Sano, H. Wakita, T. Gamo and W.C. Shanks III: Helium and carbon gas geochemistry of pore fluid from sediment-rich hydrothermal system in Escanaba Trough. Appl. Geochem., 17, 1457-1466 (2002).

A77) U. Tsunogai, F. Nakagawa, D. Komatsu, and T. Gamo: Stable carbon and oxygen isotope analysis of atmospheric carbon monoxide using CF-IRMS by isotope-ratio monitoring of CO. Anal . Chem., 74 (22), 5695-5700 (2002).

A76) U. Tsunogai, N. Yoshida, and T. Gamo: Carbon isotopic evidense of methane oxidation through sulfate reduction in sediment beneath cold seep vents on the seafloor at Nankai Trough. Mar. Geol., 187, 145-160 (2002).

A75) K. Fujioka, T. Yamanaka, T. Gamo, F. Inagaki, T. Miwa & H. Sato: An introduction to serpentinite biosphere in the Mariana forearc ----- Capsule of the deep subsurface biosphere from the Chamorro Seamount ---- , Bull. Earthq. Res. Inst., Univ. Tokyo, 76, 417-424 (2001).

A74) T. Gamo, H. Chiba, T. Yamanaka, T. Okudaira, J. Hashimoto, S. Tsuchida, J. Ishibashi, S. Kataoka, U. Tsunogai, K. Okamura, Y. Sano, and R. Shinjyo, Chemical charactersitics of newly discovered black-smoker fluids and associated hydrothermal plumes at the Rodriguez Triple Junction, Central Indian Ridge. Earth Planet. Sci. Lett., 193, 371-379 (2001).

A73) T. Gamo, N. Momoshima, S. Tolmachyov: Recent upward shift of the deep convection system in the Japan Sea, as inferred from the geochemical tracers tritium, oxygen, and nutrients. Geophys. Res. Lett., 28, 4143-4146 (2001).

A72) K. Okamura, H. Kimoto, K. Saeki, J. Ishibashi, H. Obata, M. Maruo, T. Gamo, E. Nakayama, Y. Nozaki: Development of a deep-sea in situ Mn analyzer and its application for hydrothermal plume observation. Mar. Chem, 76, 17-26 (2001).

A71) J. Hashimoto, S. Ohta, T. Gamo, H. Chiba, T. Yamaguchi, S. Tsuchida, T. Okudaira, H. Watabe, T. Yamanaka, and M. Kitazawa: First hydrothermal vent communities from the Indian Ocean discovered. Zoological Science, 18, 717-721 (2001).

A70) M. Numata, N. Nakamura, and T. Gamo: Precise measurement of chlorine stable isotopic ratios by thermal ionization mass spectrometry. Geochem. J., 35, 89-100 (2001).

A69) U. Tsunogai, N. Yoshida, J. Ishibashi, T. Gamo: 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 (14), 2439-2452 (2000).

A68) T. Gamo: Global warming may have slowed down the deep conveyor belt of a marginal sea of the northwestern Pacific: Japan Sea. Geophys. Res. Lett., 26, 3137-3140 (1999).

A67) T. Gamo: Looking into the earth interior through windows of the deep seafloor---methane seepage from the Nankai Trough. Journal of the Japanese Association for Petroleum Technology, 64, 173-183 (1999).  (in Japanese with English abstract)

A66) Y. Nozaki, D-S. Alibo, H. Amakawa, T. Gamo, & H. Hasumoto: Dissolved rare earth elements and hydrography in the Sulu Sea. Geochim. Cosmochim. Acta, 63, 2171-2181 (1999).

A65) E. Douville, P. Bienvenu, J-L. Charlou, J-P. Donval, Y. Fouquet, P. Appriou, and T. Gamo: Yttrium and rare earth elements in fluids from various deep-sea hydrothermal systems. Geochim. Cosmochim. Acta, 63, 627-643 (1999).

A64) U. Tsunogai, N. Yoshida, & T. Gamo: Carbon isotopic compositions of C2-C5 hydrocarhons and methyl chloride in urban, coastal and maritime atmosphere over western-North Pacific. J. Geophys. Res., 104 (D13), 16033-16039 (1999).

A63) Y. Nishio, T. Ishii, T. Gamo, Y. Sano: Carbon-nitrogen-helium-argon isotope systematics of mid-ocean ridge basalt glasses from Rodriguez Triple Junction, Indian Ocean: Mantle heterogeneity of volatile. Earth Planet. Sci. Lett., 170, 241-253 (1999).

A62) P. Fryer, H. Fujimoto, M. Sekine, L. Johnson, J. Kasahara, H. Masuda, T. Gamo, T. Ishii, M. Ariyoshi, and K. Fujioka: Volcanoes of the southwestern extension of the active Mariana island arc: New swath-mapping and geochemical studies, The Island Arc, 7, 596-607 (1998).

A61) K. Okamura, T. Gamo, H. Obata, E. Nakayama, H. Karatani, Y. Nozaki, Selective and sensitive determination of trace manganese in seawater by flow through technique using luminol-hydrogen peroxide chemiluminescence detection. Analytica Chimica Acta, 377, 125-131 (1998).

A60) Y. Sano, Y. Nishio, S. Sasaki, T. Gamo and K. Nagao: Helium and carbon isotope systematics at Ontake volcano, J. Geophys, Res., 103(10), 23863-23873 (1998).

A59) Y. Sano, Y. Nishio, T. Gamo, A. Jambon and B. Marty: Noble gas and carbon isotopes in Mariana Trough basalt glasses, Appl. Geochem., 13(4), 441-449 (1998).

A58) U. Tsunogai, J. Ishibashi, H. Wakita, & T. Gamo: Methane-rich plumes in Suruga Trough (Japan) and their carbon isotope characterization. Earth Planet. Sci. Lett., 160 (1/2), 97-105 (1998).

A57) Y. Nishio, S. Sasaki, T. Gamo, H. Hiyagon, and Y. Sano: Carbon and helium isotope systematics in North Fiji Basin basalt glasses. Earth Planet. Sci. Lett., 154, 127-128 (1998).

A56) M. Kohara, T. Gamo, H. Yanagawa, and K. Kobayashi: Stability of amino acids in simulated hydrothermal vent environment. Chem. Lett., 1997, 1053-1054 (1997).

A55) Y. Sano, T. Gamo and S.N. Williams: Secular variations of helium and carbon isotopes at Galeras Volcano, Columbia, J. Volcanol. Geotherm. Res., 77, 255-265 (1997).

A54) T. Gamo, K. Okamura, J-L. Charlou, T. Urabe, J-M. Auzende, and shipboard scientific party of the ManusFlux Cruise, J. Ishibashi, K. Shitashima and Y. Kodama: Acidic and sulfate-rich hydrothermal fluid from the Manus basin, Papua New Guinea, Geology, 25, 139-142 (1997).

A53) T. Gamo, J. Ishibashi and K. Shitashima: Unique hydrothermal fluid from the DESMOS caldera, Manus Basin: reply to comments by J.A. Resing and F.J. Sansone: Deep-Sea Res., 43, 1873-1875 (1996).

A52) H.N. Edmonds, C.R. German, D.R.H. Green, Y. Huh, T. Gamo, and J.M. Edmond: Continuation of the hydrothermal fluid chemistry time series at TAG, and the effects of ODP drilling. Geophys. Res. Lett., 23, 3487-3489 (1996).

A51) T. Gamo, H. Chiba, H. Masuda, H.N. Edmonds, K. Fujioka, Y. Kodama, H. Nanba, Y. Sano: Chemical characteristeics of hydrothermal fluids from the TAG mound of the mid-Atlantic Ridge in August 1994: implications for spatial and temporal variability of hydrothermal activity. Geophys. Res. Lett., 23, 3483-3486 (1996).

A50) T. Gamo, E. Nakayama, K. Shitashima, K. Isshiki, H. Obata, K. Okamura, S. Kanayama, T. Oomori, T. Koizumi, S. Matsumoto, and H. Hasumoto: Hydrothermal plumes at the Rodriguez Triple Junction, Indian Ridge. Earth Planet. Sci. Lett., 142, 261-270 (1996).

A49) U. Tsunogai, J. Ishibashi, H. Wakita, T. Gamo, T. Masuzawa, T. Nakatsuka, Y. Nojiri, and T. Nakamura: Fresh water seepage and pore water recycling on the seafloor: Sagami Trough subduction zone, Japan. Earth Planet. Sci. Lett., 138, 157-168 (1996).

A48) Y. Sano, N. Takahata, and T. Gamo: Helium isotopes in south Pacific deep seawater. Geochem. J., 29, 377-384 (1995).

A47) K. Kobayashi, M. Kohara, T. Gamo, and H. Yanagawa: Formation and alteration of organic compounds in submarine hydrothermal vent environments. In: Biogeocheimical Processes and Ocean Flux in the Western Pacific (ed by H. Sakai and Y. Nozaki), Terra Scientific Publishing Company (TERRAPUB), Tokyo, 523-535 (1995).

A46) T. Gamo: Wide variation of chemical characteristics of submarine hydrothermal fluids due to the secondary modification processes after high temperature water-rock interaction: a review. In: Biogeocheimical Processes and Ocean Flux in the Western Pacific (ed by H. Sakai and Y. Nozaki), Terra Scientific Publishing Company (TERRAPUB), Tokyo, 425-451 (1995).

A45) K. Nakashima, H. Sakai, H. Yoshida, H. Chiba, Y. Tanaka, T. Gamo, J. Ishibashi, and U. Tsunogai: Hydrothermal mineralization in the Mid-Okinawa Trough. In: Biogeocheimical Processes and Ocean Flux in the Western Pacific (ed by H. Sakai and Y. Nozaki), Terra Scientific Publishing Company (TERRAPUB), Tokyo, 487-508 (1995).

A44) J. Ishibashi, Y. Sano, H. Wakita, T. Gamo, M. Tsutsumi and H. Sakai: Helium and carbon geochemistry of hydrothermal fluids from the mid-Okinawa Trough, back arc basin. Chem. Geol., 123, 1-15 (1995).

A43) T. Gamo, M. Tsutsumi, H. Sakai, T. Nakazawa, T. Machida, H. Honda and T. Itoh: Long-term monitoring of carbon and oxygen isotope ratios of stratospheric CO2 over Japan. Geophys. Res. Lett., 22(4), 397-400 (1995).

A42) Y. Sano, T. Gamo, K. Notsu, and H. Wakita: Secular variations of carbon and helium isotopes at active volcano. J. Volcanol. Geotherm. Res., 64, 83-94 (1995).

A41) Y. Nishio, M. Tsutsumi, T. Gamo and Y. Sano: Hydrogen affects dC value of CO2 measured by mass spectrometry with electron-impact ionization. Anal. Sci., 11, 9-12 (1995).

A40) J. Ishibashi, H. Wakita, Y. Nojiri, D. Grimaud, P.Jean-Baptiste, T. Gamo, J-M. Auzende, and T. Urabe: Helium and carbon geochemistry of hydrothermal fluids from the North Fiji Basin spreading ridge (southwest Pacific). Earth Planet. Sci. Lett., 128, 183-197 (1994).

A39) A.C. Campbell, C.R. German, M.R. Palmer, T. Gamo, and J. Edmond: Chemistry of hydrothermal fluids from Escanaba Trough, Gorda Ridge. U.S.G.S. Bull. 2022 (Geologic, Hydrothermal, and Biologic Studies at Escanaba Trough, Gorda Ridge, Offshore Northern California), 201-221 (1994).

A38) T. Gamo, H. Sakai, E. Nakayama, K. Ishida and H. Kimoto: A submersible flow through analyzer for in situ colorimetric measurement down to 2000 m depth in the ocean. Anal. Sci., 10, 843-848 (1994).

A37) U. Tsunogai, J. Ishibashi, H. Wakita, T. Gamo, K. Watanabe, T. Kajimura, S. Kanayama, and H. Sakai: Peculiar features of Suiyo seamount hydrothermal fluids, Izu-Bonin Arc: Differences from subaerial volcanism. Earth Planet. Sci. Lett., 126, 289-302 (1994).

A36) Y. Sano, J. Hirabayashi, T. Oba and T. Gamo: Helium and carbon isotope systematics at Kusatsu-Shirane Volcano, Japan. Appl. Geochem., 9, 371-377 (1994).

A35) C.-F. You, D.A. Butterfield, A.J. Spivack, J.M.Gieskes, T. Gamo and A.J. Campbell: Boron and halide systematics in submarine hydrothermal systems: effects of phase separation and sedimentary contributions. Earth Planet. Sci. Lett., 123, 227-238 (1994).

A34) T. Gamo, H. Sakai, J. Ishibashi, E. Nakayama, K. Isshiki, H. Matsuura, K. Shitashima, K. Takeuchi and S. Ohta: Hydrothermal plumes in the eastern Manus Basin, Bismarck Sea: CH4, Mn, Al and pH anomalies. Deep-Sea Res., 40 (11/12), 2335-2349 (1993).

A33) M. Kastner, H. Elderfield, W.J. Jenkins, J.M. Gieskes, and T. Gamo: Geochemical and isotopic evidence for fluid flow in the western Nankai subduction zone, Japan. Proc. ODP, Sci. Results, 131, 397-413 (1993).

A32) J.M. Gieskes, T. Gamo and M. Kastner: Major and minor elements geochemistry of interstitial waters of Site 808 - Nankai Trough: an overview. Proc. ODP, Sci. Results, 131, 387-396 (1993).

A31) H. Masuda, H. Tanaka, T. Gamo, W. Soh, and A. Taira: Major element chemistry and alteration mineralogy of volcanic ash, Site 808 in the Nankai Trough, ODP Leg 131. Proc. ODP, Sci. Results, 131, 175-183 (1993).

A30) C.-F. You, J.M. Gieskes, R.F. Chen, A. Spivack and T. Gamo: I, Br, B, Mn and dissolved organic carbon in intersititial waters of organic carbon rich marine sediments: observations in the Nankai accretionary prism. Proc. ODP, Sci. Results, 131, 165-173 (1993).

A29) T. Gamo, M. Kastner, U. Berner, and J. Gieskes:  Carbon isotope ratio of total inorganic carbon in pore waters associated with diagenesis of organic material at the ODP Site 808, Nankai Trough. Proc. ODP, Sci. Results, 131, 159-163 (1993).

A28) T. Gamo:  Philippine Sea abyssal waters in the northwestern Pacific: characterization from tracer-tracer diagrams. In Deep Ocean Circulation, Physical and Chemical aspects, ed by T. Teramoto, Elsevior Science Publishers, p. 91-104 (1993).

A27) A. Taira, I. Hill, J. Firth, U. Berner, W. Bruckmann, T. Byrne, T. Chabernaud, A. Fisher, J-P. Foucher, T. Gamo, J. Gieskes, R. Hyndman, D. Karig, M. Kastner, Y. Kato, S. Lallemant, R. Lu, A. Maltman, G. Moore, K. Moran, G. Olaffson, W. Owens, K. Pickering, F. Siena, E. Taylor, M. Underwood, C. Wilkinson, M. Yamano and J. Zhang: Sediment deformation and hydrogeology of the Nankai Trough accretionary prism: synthesis of shipboard results of ODP Leg 131. Earth Planet. Sci. Lett., 109, 431-450 (1992).

A26) N. Chamot-Rooke, S.J. Lallemant, X. LePichon, P. Henry, M. Sibuet, J. Boulegue, J.-P. Foucher, T. Furuta, T. Gamo, G. Glacon, K. Kobayashi, S. Kuramoto, Y. Ogawa, P. Schultheiss, J. Segawa, A. Takeuchi, P. Tarits and H. Tokuyama: Tectonic context of fluid venting at the toe of the eastern Nankai accretionary prism: evidence for a shallow detachment fault. Earth Planet. Sci. Lett., 109, 319-332 (1992).

A25) H. Sakai, T. Gamo, Y. Ogawa and J. Boulegue: Stable isotopic ratios and origins of the carbonate crust collected from the subduction-induced cold seepage at the eastern Nankai Trough. Earth Planet. Sci. Lett., 109, 391-404 (1992).

A24) T. Gamo, H. Sakai, J. Ishibashi, K. Shitashima, and J. Boulegue: Methane, ethane and total inorganic carbon in pore fluids taken during the 1989 KAIKO-NANKAI project. Earth Planet. Sci. Lett., 109, 383-390 (1992).

A23) G. Igarashi, M. Ozima, J. Ishibashi, T. Gamo, H. Sakai, Y. Nojiri, and T. Kawai: Mantle helium injection from the bottom of Lake Mashu, Japan. Earth Planet. Sci. Lett., 108, 11-18 (1992).

A22) T. Gamo, H. Sakai, E.-S. Kim, K. Shitashima, and J. Ishibashi: High alkalinity due to sulfate reduction in the CLAM hydrothermal field, Okinawa Trough. Earth Planet. Sci. Lett., 107, 328-338 (1991).

A21) K. Fujioka, T. Gamo, M. Kinoshita, K. Koga, K. Kaiho, M. Yamano and H. Tokuyama: Seismo-volcanic catastrophe happened in western Sagami Bay, central Japan. J. Phys. Earth, 39, 267-297 (1991).

A20) H. Sakai, T. Gamo, J. Ishibashi, K. Shitashima, E.-S. Kim, F. Yanagisawa, M. Tsutsumi, T. Tanaka, T. Matsumoto, T. Naganuma and K. Mitsuzawa: Unique chemistry of the backarc basin hydrothermal solution at the mid-Okinawa Trough, Japan. Geophys. Res. Lett., 17, 2133-2136 (1990).

A19) H. Sakai, T. Gamo, E.-S. Kim, M. Tsutsumi, T. Tanaka, J. Ishibashi, H. Wakita, M. Yamano, and T. Oomori: Venting of carbon dioxide-rich fluid and hydrate formation in the mid-Okinawa Trough backarc basin. Science, 248, 1093-1096 (1990).

A18) P. Sedwick, T. Gamo and G.M. McMurtry: Manganese and methane anomalies in the north Fiji Basin. Deep-Sea Res., 37, 891-896 (1990).

A17) Y. Sano, H. Wakita, J. Ishibashi, T. Gamo, and H. Sakai: Helium isotopes in the Japan Sea water. Chikyuukagaku, 23, 61-67 (in Japanese with English abst.) (1989).

A16) T. Gamo, M. Tsutsumi, H. Sakai, T. Nakazawa, M. Tanaka, H. Honda, H. Kubo and T. Itoh:  Carbon and oxygen isotopic ratios of carbon dioxide of a stratospheric profile over Japan. Tellus, 41B, 127-133 (1989).

A15) T. Gamo, J. Ishibashi, K. Shitashima, M. Kinoshita, M. Watanabe, E. Nakayama, Y. Sohrin, E.-S.Kim, T. Masuzawa and K. Fujioka: Anomalies of bottom CH4 and trace metal concentrations associated with high heat flow at the Calyptogena community off Hatsushima Island, Sagami Bay, Japan: preliminary report of Tansei Maru KT-88-1 cruise Leg-1. Geochem. J., 22, 215-230 (1988).

A14) J. Ishibashi, T. Gamo, H. Sakai, Y. Nojiri, G.Igarashi, K.Shitashima and H.Tsubota: Geochemical evidence for Hydrothermal activity in the Okinawa Trough. Geochem. J., 22, 107-114 (1988).

A13) M. Fukasawa and T. Gamo:  Behavior of a hydrothermal plume. Chikyuukagaku, 22, 114-122  (1988) (in Japanese with English abst.) .

A12) M. Kimura, S. Uyeda, Y. Kato, T. Tanaka, M. Yamano, T. Gamo, H. Sakai, S. Kato, E. Izawa and T. Oomori:  Active hydrothermal mounds in the Okinawa Trough backarc basin, Japan. Tectonophys., 145, 319-324 (1988).

A11) H. Sakai, T. Gamo, K. Endow, J. Ishibashi, T.Ishizuka, F.Yanagisawa, M. Kusakabe, T. Akagi, G. Igarashi and S. Ohta: Geochemical study of the abyssal seep communities at the Hatsushima site, Sagami Bay, Central Japan. Geochem. J., 21, 227-236 (1987).

A10) T. Gamo, J. Ishibashi, H. Sakai and B. Tilbrook:  Methane anomalies in seawater above the Loihi submarine summit area, Hawaii. Geochim. Cosmochim. Acta, 51, 2857-2864 (1987).

A9) K. Fujioka, M. Kinoshita, J.-H. Choi, K. Fuse, T. Gamo, K. Hasumoto, J. Ishibashi, K. Koga, H. Miyata, E. Nishiyama, K. Sayanagi, K. Shitashima, K. Suzuki, Y. Tanaka, H. Tokuyama and M. Watanabe:  Preliminary Report of the KT86-10 Cruise for the Mikura and Hachijo Basin. Bull. Earthq. Res. Inst., University of Tokyo, 62, 61-132 (1987).

A8) H. Sakai, H. Tsubota, T. Nakai, J. Ishibashi, T. Akagi, T. Gamo, B. Tilbrook, G. Igarashi, M. Kodera, K. Shitashima, S. Nakamura, K. Fujioka, G. McMurtry, A. Malahoff and M. Ozima: Hydrothermal plumes on the summit of Loihi Seamount, Hawaii. Geochem. J., 21, 11-21 (1987).

A7) T. Gamo, Y. Horibe and H. Kobayashi: Comparison of oceanic D14C data with those of GEOSECS: vertical profiles in 1973 (GEOSECS) and in 1980 at (30°N, 170°E) in the northwestern Pacific Ocean. Radiocarbon, 29, 53-56 (1987).

A6) T. Gamo, Y. Nozaki, H. Sakai, T. Nakai and H. Tsubota: Spacial and temporal variations of water characteristics in the Japan Sea bottom layer. J. Mar. Res., 44, 781-793 (1986).

A5) T. Gamo and Y. Horibe: Gas chromatographic separation of CO2 and N2O for measurement of d13C in atmospheric CO2. Geochem. J., 19, 171-174 (1985).

A4) T. Gamo and Y. Horibe: Excess bottom Rn-222 profiles and their implications in the northwestern Pacific Ocean. Earth Planet. Sci. Lett., 71, 215-228 (1984).

A3) T. Gamo and Y. Horibe: Abyssal circulation in the Japan Sea. J. Oceanogr. Soc. Jpn., 39, 209-219 (1983).

A2) T. Gamo and Y. Horibe:  Precise determination of dissolved gases in sea water by shipboard gas chromatography. Bull. Chem. Soc. Jpn, 53, 2839-2842 (1980).

A1) Y. Horibe, T. Gamo and Y. Baba: Estimation of carbon dioxide flux from submarine volcano in Kagoshima Bay, Japan. In Isotope Marine Chemistry, ed by E.D. Goldberg, Y. Horibe and K. Saruhashi, Uchida Rokakuho Pub. Co. Ltd., Tokyo, Chap.16, p.327-337 (1980).