Presentations (International)

2006

AGU 2006 Fall Meeting, San Francisco, 11-15 December 2006
Tsunogai, U., Kido, T., Hirota, A., Ohkubo, S., Komatsu, D D,Nakagawa, F., Chemical Conversion of PON to Nitrous Oxide for Nitrogen Isotopic Analysis : High-Sensitivity Tracer Assay for Nitrogen Fixation, OS53A-1094, AGU 2006 Fall Meeting, San Francisco, 11-15 December 2006.

Komatsu, D.D., Ohkubo, S., Ishimura, T., Nakagawa, F., Tsunogai, U., Determination of triple oxygen isotopic compositions of nitrate by using continuous-flow isotope ratio MS. H13C-1409, AGU 2006 Fall Meeting, San Francisco, 11-15 December 2006.


Konno, U., Tsunogai, U., Nakagawa, F., Nakaseama, M., Ishibashi, J., Nunoura, T., Nakamura, K., Liquid CO2 venting on the seafloor: Yonaguni Knoll IV hydrothermal system, Okinawa Trough, V23B-0606, AGU 2006 Fall Meeting, San Francisco, 11-15 December 2006.


Kameyama, S., Nakagawa, F Sasakawa, M., Sasakawa, M., Yamaguchi, J., Komatsu, D.D., Ijiri, A., Tsunogai, U., Horiguchi, T., Kawamura, H., Tsuda, A., Responses of dissolved trace gases (CH4, N2O, CO, NMHCs, CH3Cl) to phytoplankton bloom during in situ iron enrichment (SEEDII) in the western subarctic Pacific, A53A-0166, AGU 2006 Fall Meeting, San Francisco, 11-15 December 2006.

2005

AGU 2005 Fall Meeting,, 5-9, Dec., 2005.
Kawagucci, S., U. Tsunogai, F. Nakagawa, S. Aoki, T. Nakazawa, H. Honda, and T. Gamo, Investigation into the stratosphere by long-term observations of the triple isotopic compositions of stratospheric CO2. A33B-0909, AGU 2005 Fall Meeting, 5-9, Dec., 2005.

Toki, T., K. Maegawa, U. Tsunogai, J. Ashi, M. Kinoshita, and T. Gamo, Distribution of Dissolved Hydrogen in Pore Water at Cold Seep Site. OS33C-1485, AGU 2005 Fall Meeting, 5-9, Dec., 2005.

The Asian SOLAS Meeting in Tokyo, Univ Tokyo., 1-3, June, 2005.
Tsunogai, U., F. Nakagawa, M. Sasakawa, A. Ijiri, S. Kawaguchi, S. Kameyama, J. Yamaguchi, and D.D. Komatsu, Biogeochemical production and consumption of trace gases in sea water during SEEDS II experiment: An evaluation based on stable isotopic compositions. The Asian SOLAS Meeting in Tokyo, Univ Tokyo., 1-3, June, 2005.

2004

AGU 2004 Fall Meeting, 13-17, Dec., 2004.
Kawagucci, S., Tsunogai, U., Nakagawa, F., Honda, H., Aoki, S., Nakazawa, T., Gamo, T., Rapid and simple quantifying system for 17O anomaly in CO2 by using CF/IRMS, A21B-0726, AGU 2004 Fall Meeting, 13-17, Dec., 2004.

Ishimura, T., Tsunogai, U., Gamo, T., Stable carbon and oxygen isotopic analysis of sub-microgram quantities of CaCO3 and the application to the analysis of single small foraminiferal shells, PP23B-1439, AGU 2004 Fall Meeting, 13-17, Dec., 2004.

Komatsu, D.D., Tsunogai, U., Yamaguchi, J., Nakagawa, F., Yokouchi, Y., Nojiri, Y., The budget of atmospheric methyl chloride using stable carbon isotopic mass-balance approach, A51C-0784, 2004 AGU 2004 Fall Meeting, 13-17, Dec., 2004.

Nakayama, N., Tsunogai, U., Ashi, J., Gamo, T., Stable isotope anomalies and low chloride concentrations in pore water of CH4-rich sediments at the Tanegashima Mud Volcano, Japan, OS23B-1309, AGU 2004 Fall Meeting, 13-17, Dec., 2004.

Kameyama, S., Tsunogai, U., Gamo, T., Zhang, J., Suzuki, M., Koyama, Y., Methane and nitrous oxide in submarine groundwater discharges: Toyama Bay, northwestern Japan, H43D-0393, AGU 2004 Fall Meeting, 13-17, Dec., 2004.

Nakagawa, F., Tsunogai, U., Komatsu, D.D., Kim, Y., Tanaka, N.,18O-depleted CO emission from boreal forest fire in Alaska, A51C-0785, AGU 2004 Fall Meeting, 13-17, Dec., 2004.

Toki, T., Hirota, A., Tsunogai, U., Gamo, T., Nakamura, K., Noguchi, T., Taira, N., Oomori, T., Ishibashi, J., Utsumi, M., Methane distribution in plumes of the south Mariana back-arc spreading center, V41B-1392, AGU 2004 Fall Meeting, 13-17, Dec., 2004.

Tsunogai, U., Nakagawa, F., Konno, U., Maegawa, K., Gamo, T., Ishibashi, J., Microbially Produced enrichment of CO and N2O in hydrothermal plumes, V43F-04, AGU 2004 Fall Meeting, 13-17, Dec., 2004.

SOLAS Science 2004, Halifax, CANADA, Oct., 2004
Nakagawa,F., U. Tsunogai, S. Kameyama, M. Sasakawa, D.D. Komatsu, J. Yamaguchi, S. Kawagucci, M. Uematsu, and A. Tsuda, Stable isotopic studies of trace gases in seawater: Constraints on their production and fate mechanisms. SOLAS (surface ocean - lower atmosphere study) Science 2004, Halifax, CANADA, Oct., 2004

2003

2003 American Geophysical Union Fall Meeting, San Fransisco, 8-12 December 2003

Ijiri, A., Tsunogai, U., Gamo, T., Ashi, J., Kinoshita, M., Origin of Low Salinity Pore Fluids: Kumano Forearc Mud Volcanoes, Nankai Trough (T52C-0288), 2003 American Geophysical Union Fall Meeting, San Fransisco, 8-12 December 2003.

Toki, T., Tsunogai, U., Gamo, T., Kuramoto, S., Ashi, J., Sources of Low-Chloride Fluids in Sediments beneath Biological Communities on the Nankai Accretionary Wedge off Kumano,San Fransisco (T52C-0298), 2003 American Geophysical Union Fall Meeting, San Fransisco, 8-12 December 2003.


Goldschmidt Conference 2003, Kurashiki, Japan, 7-12 September, 2003.

Komatsu, D.D., U. Tsunogai, F. Nakagawa, and T. Gamo, Carbon and oxygen kinetic isotope effects during oxidation of atmospheric carbon monoxide in secondary sink soil, Goldschmidt Conference 2003, Kurashiki, Japan, 7-12 September, 2003.

Nakagawa, F., D.D. Komatsu, U. Tsunogai, T. Gamo, K. Yamada and H. Nara, Carbon Isotopic Composition of CH4 and CO Emitted during Biomass Burning Experiments, Goldschmidt Conference 2003, Kurashiki, Japan, 7-12 September, 2003.

Yamaguchi, J., Tsunogai U., Komatsu D., Tsunogai U, Nakagawa F& Akiyama K.: Origin of Atmospheric Benzen using its Stable Carbon Isotopic Composition as a Tracer, Goldschmidt Conference 2003, Kurashiki, Japan, 7-12 September, 2003.

Gamo T, Tsunogai U, Ichibayashi S & Hirota A: 'Microbial Plumes' as Inferred from the Increase of Stable Carbon Isotope Composition of Methane Originated from Submarine Hydrothermal Activity, Goldschmidt Conference 2003, Kurashiki, Japan, 7-12 September, 2003."

IjiriA, Tsunogai U, Gamo T & Hikida Y: Highly Isotopically Depleted Hydrocarbon Gases in Methane-derived Carbonate of the Cretaceous Age, Goldschmidt Conference 2003, Kurashiki, Japan, 7-12 September, 2003.

Kameyama S, Tsunogai U, Gamo T, Zhang J & Suzuki M: Geochemical Studies of the Submarine Ground Water Discharge by using Methane Concentration and its Carbon Isotope Ratio as a Tracer; Toyama Bay, Japan, Goldschmidt Conference 2003, Kurashiki, Japan, 7-12 September, 2003.

Toki T, Tsunogai U, Gamo T & Kuramoto S: Geochemical Study of Cold Seeps on the Seafloor off Kumano in Nankai Trough, Goldschmidt Conference 2003, Kurashiki, Japan, 7-12 September, 2003.


KosakaA, Tsunogai U, Nakayama N, Gamo T, Sumino H & Nagao K: Gas Geochemistry of Seafloor Seeping Bubbles at Kuroshima Knoll, Goldschmidt Conference 2003, Kurashiki, Japan, 7-12 September, 2003.


8th International Conference on ASAAQ, Tsukuba International Congress Center (EPOCHAL TSUKUBA), Tsukuba Science City, March 11-13, 2003.

Nakagawa, F., J. Moriizumi, U. Tsunogai, K. Yamada and N. Yoshida, Stable hydrogen and carbon isotopic compositions of atmospheric methane and its sources in urban area: identification of anthropogenic sources 8th International Conference on ASAAQ, Tsukuba International Congress Center (EPOCHAL TSUKUBA), Tsukuba Science City, March 11-13, 2003.

Nakagawa, F., D. D. Komatsu, U. Tsunogai, T. Gamo, K. Yamada, Y. Ozaki, H. Nara, M. Ogawa, N. Yoshida, S. Sudo, S. Yonemura, and H. Tsuruta, Stable carbon and oxygen isotopic compositions of CO2, CO and CH4 emitted from biomass burning, 8th International Conference on ASAAQ, Tsukuba International Congress Center (EPOCHAL TSUKUBA), Tsukuba Science City, March 11-13, 2003.

2002

AGU 2002 Fall Meeting, San Francisco, 6-10 Dec. 2002
Nakagawa, F., Tsunogai, U., Gamo, T., Ishibashi, J., CO enrichment in hydrothermal plumes: Suiyo seamount, Izu-Bonin arc, V72A-1298, AGU 2002 Fall Meeting, San Francisco, 6-10 Dec. 2002.

Tsunogai, U., Nakagawa, F., Komatsu, D.D., Gamo, T., Stable carbon and oxygen isotopic analysis of carbon monoxide in soil gas using CF-IRMS by isotope-ratio monitoring of CO, B71A-0715, AGU 2002 Fall Meeting, San Francisco, 6-10 Dec. 2002.

2002 Ocean Sciences Meeting, Hawaii Convention Center, Honolulu, Hawaii, 11-15 February 2002.
Nakagawa, F., Tsunogai, U., Gamo, T., Yoshida, N., Stable Isotopic Compositions and Fractionations of Carbon Monoxide in Seawater, 2002 Ocean Sciences Meeting, Hawaii Convention Center, Honolulu, Hawaii, 11-15 February 2002.

Tsunogai, U., Kouzuma, F., Toki, T., Gamo, T., Ishibashi, J., Stable isotopic compositions of CO in hydrothermal fluids: signature of sub-seafloor biosphere?, 2002 Ocean Sciences Meeting, Hawaii Convention Center, Honolulu, Hawaii, 11-15 February 2002.