1997 Fiscal Year Annual Research Report

北方圏における地球環境変動に関する共同研究

Research Project

Project/Area Number	08045020
Research Institution	Tohoku University
Principal Investigator	田中正之東北大学, 理学部, 教授 (90004340)
Co-Investigator(Kenkyū-buntansha)	吉本和生東北大学, 大学院・理学研究科, 助手 (10281966) 長谷川昭東北大学, 理学部, 教授 (40004460) 大竹政和東北大学, 大学院・理学研究科, 教授 (60203816) 高橋幸弘東北大学, 大学院・理学研究科, 助手 (50236329) 福西浩東北大学, 大学院・理学研究科, 教授 (90099937)
Keywords	北極圏 / 地球環境 / オーロラ / オゾン層 / 地震観測 / アラスカ
Research Abstract	東北大学理学部・同理学研究科とアラスカ大学フェアバンクス校との部局間協定にもとづき、本年度の北方圏における地球環境変動に関する共同研究は、(1)オーロラと超高層大気の研究、(2)成層圏オゾン層の研究、(3)地震・火山の研究を中心に行なった。まず、(1)オーロラと超高層大気の研究では、東北大学で開発したプロトンオーロライメージャーを昨年度にアラスカ大学地球物理学研究所ポーカーフラットリサーチレンジに設置し観測を行ったが、本年度は得られたデータの共同解析を実施するとともに、昼側カスプ領域のオーロラを観測するために本装置をスバールバルに移設する作業を共同で行った。スバールバルでの観測は1997年11月からアラスカ大学側によって行われており、得られたデータの共同解析は来年度に行う予定である。(2)成層圏オゾン層の研究では、我が国が打ち上げたADEOS衛星(みどり)との同時観測のために東北大学のレーザーヘテロダイン分光計をポーカーフラットリサーチレンジに設置し、1997年2月〜5月の間、オゾン、一酸化二窒素、メタンの観測を実施した。得られたデータの共同解析を行い、北極域の極渦内で、冬季から春季にかけてオゾン破壊が進行し、南極オゾンホールに類似した大規模なオゾン減少域が出現することを明らかにした。(3)地震・火山の研究では、アラスカ、アリューシャン、日本列島で発生する大規模地震の関係を明らかにするために、アラスカ大学地震観測ネットワークで得られたデータと東北大学などの日本の地震観測ネットワークで得られたデータの共同解析を実施し、発震メカニズムの検討を行った。さらに今後の共同観測と共同解析に関する詳細な検討を行った。

Research Products

(19 results)

All Other

All Publications (19 results)

[Publications] T.Nakazawa, S.Morimoto, S.Aoki and M.Tanaka: "Temporal and spatial variations of the carbon isotopic ratio of atmospheric carbon dioxide in the western Pacific region" Journal of Geophysical Research. 102. 1271-1285 (1997)
[Publications] Yoshimoto, K., H.Sato and M.ohtake: "Short-wavelength crustal heterogeneities in the Nikko area, central Japan, revealed from the three-component seismogram envelope analysis" Phys. Earth Planet. Inter.104. 63-73 (1997)
[Publications] Yoshimoto, K., H.Sato and M.Ohtake: "Three-component seismogram envelope synthesis in randomly inhomogeneous semi-infinite media based on the single scattering approximation" Phys. Earth Planet. Inter.104. 37-61 (1997)
[Publications] Nakahara, H., T.Nishimura, H.Sato, and M.Ohtake: "Seismogram envelope inversion for the spatial distribution of high-frequency energy radiation on the earthquake fault : Application to the 1994 far east off Sanriku earthquake (Mw=7.7)" J. Geophys. Res.103. 855-867 (1998)
[Publications] Hasegawa, A., A.Yamamoto, M.Umino, S.Miura, S.Horiuchi, D.Zhao, and H.Sato: "Seismic activity and deformation process of the overriding plate in the northeastern Japan subduction zone" Tectonophysics. (subnitted).
[Publications] H.kawamura and P.Wu: "Formation mechanizm of the Japan sea proper water in the flux surface off Vladivostok" Journal of Geophysical Research. (in Press).
[Publications] Suga, T., Y.Takei and K.Hanawa: "Thermostad distribution in the North Pacefic subtropical gyre : the Subtropical Mode Water and the Central Mode Water." J.Phys.Oceanogr.27. 140-152 (1997)
[Publications] Morioka, A., F.Tsuchiyama and H.Misawa: "Modulation of jovian electrons by the solar wind" Adv. Space Res.20. 205-208 (1997)
[Publications] S.-I.Akasofu: "Search for the ″unknown″ quantity in the solar sind : A personal account" Journal of Geophysical Research. 101. 10531-10540 (1996)
[Publications] A.T.Weatherwax, J.LaBelle, M.L.Trimpi, R.A.Trenmann, J.Minow, C.Deehr: "Statisfical and case studies of radio emissions observed near 2fce and 3fce in the auroral zone" Journal of Geophysical Research. 100. 7745-7757 (1995)
[Publications] D.D.Sentman, D.A.Ehring: "Midlatitude defection of ELF whistlers" Journal of Geophysical Research. 99. 2183-2190 (1994)
[Publications] D.Gillard, M.Wyss, P.Okubo: "Type of faulting and orientation of stress and strain as a function of space and time in Kilauea's south flank, Hawaii" Journal of Geophysical Research. 101. 16025-16042 (1996)
[Publications] C.M.Jodwalis, R.L.Benner: "Sulfur gas fluxes and horizontal in homogeneities in the marine boundary layer" Journal of Geophysical Research. 101. 4393-4401 (1996)
[Publications] D.M.Suszcynsky, R.Roussel-Dupre, G.Shaw: "Ground-Based search for X rays generated by thunderstorms and lightning" Journal of Geophysical Research. 101. 23505-23516 (1996)
[Publications] D.M.Suszcynsky, R.Roussel-Dupre, G.Shaw: "Ground-Based search for X rays generated by thunderstorms and lightning" Journal of Geophysical Research. 101. 23505-23516 (1996)J.Slusser, K.Hammond, A.Kylling, K.Stamnes, L.Perliski, A.Dahlback, D.Anderson, R.Demajistre:
[Publications] "Comparison of air mass computations" Journal of Geophysical Research. 101. 24655-24659 (1996)
[Publications] W.Sun, Y.Kamide, S.-I Akasofu: "Substorm current in the equatorial plane of the magnetosphere declared from ground-based magnetometer chain records" Journal of Geophysical Research. 101. 24655-24659 (1996)
[Publications] G.Hernandez, J.M.Forbes, R.W.Smith, Y.Portnyagin, J.F.Booth, N.Makarov: "Simultaneous mesospheric wind measurements near South Pole by optical and meteor redar methods" G.R.L.23. 1079-1082 (1996)
[Publications] P.M.Kintner, J.Bonnell, R.Arnoldy, K.Lyneh, C.Pollock, T.Moore, J.Holtet, C.Deehr, H.Stenbaek-Nielsen, R.Smith J.Olson J.Moen: "The SCIFER experiment" G.R.L.23. 1865-1868 (1996)

1997 Fiscal Year Annual Research Report

北方圏における地球環境変動に関する共同研究

Principal Investigator

田中 正之 東北大学, 理学部, 教授 (90004340)

Research Products

[Publications] T.Nakazawa, S.Morimoto, S.Aoki and M.Tanaka: "Temporal and spatial variations of the carbon isotopic ratio of atmospheric carbon dioxide in the western Pacific region" Journal of Geophysical Research. 102. 1271-1285 (1997)

[Publications] Yoshimoto, K., H.Sato and M.ohtake: "Short-wavelength crustal heterogeneities in the Nikko area, central Japan, revealed from the three-component seismogram envelope analysis" Phys. Earth Planet. Inter.104. 63-73 (1997)

[Publications] Yoshimoto, K., H.Sato and M.Ohtake: "Three-component seismogram envelope synthesis in randomly inhomogeneous semi-infinite media based on the single scattering approximation" Phys. Earth Planet. Inter.104. 37-61 (1997)

[Publications] Nakahara, H., T.Nishimura, H.Sato, and M.Ohtake: "Seismogram envelope inversion for the spatial distribution of high-frequency energy radiation on the earthquake fault : Application to the 1994 far east off Sanriku earthquake (Mw=7.7)" J. Geophys. Res.103. 855-867 (1998)

[Publications] Hasegawa, A., A.Yamamoto, M.Umino, S.Miura, S.Horiuchi, D.Zhao, and H.Sato: "Seismic activity and deformation process of the overriding plate in the northeastern Japan subduction zone" Tectonophysics. (subnitted).

[Publications] H.kawamura and P.Wu: "Formation mechanizm of the Japan sea proper water in the flux surface off Vladivostok" Journal of Geophysical Research. (in Press).

[Publications] Suga, T., Y.Takei and K.Hanawa: "Thermostad distribution in the North Pacefic subtropical gyre : the Subtropical Mode Water and the Central Mode Water." J.Phys.Oceanogr.27. 140-152 (1997)

[Publications] Morioka, A., F.Tsuchiyama and H.Misawa: "Modulation of jovian electrons by the solar wind" Adv. Space Res.20. 205-208 (1997)

[Publications] S.-I.Akasofu: "Search for the ″unknown″ quantity in the solar sind : A personal account" Journal of Geophysical Research. 101. 10531-10540 (1996)

[Publications] A.T.Weatherwax, J.LaBelle, M.L.Trimpi, R.A.Trenmann, J.Minow, C.Deehr: "Statisfical and case studies of radio emissions observed near 2fce and 3fce in the auroral zone" Journal of Geophysical Research. 100. 7745-7757 (1995)

[Publications] D.D.Sentman, D.A.Ehring: "Midlatitude defection of ELF whistlers" Journal of Geophysical Research. 99. 2183-2190 (1994)

[Publications] D.Gillard, M.Wyss, P.Okubo: "Type of faulting and orientation of stress and strain as a function of space and time in Kilauea's south flank, Hawaii" Journal of Geophysical Research. 101. 16025-16042 (1996)

[Publications] C.M.Jodwalis, R.L.Benner: "Sulfur gas fluxes and horizontal in homogeneities in the marine boundary layer" Journal of Geophysical Research. 101. 4393-4401 (1996)

[Publications] D.M.Suszcynsky, R.Roussel-Dupre, G.Shaw: "Ground-Based search for X rays generated by thunderstorms and lightning" Journal of Geophysical Research. 101. 23505-23516 (1996)

[Publications] D.M.Suszcynsky, R.Roussel-Dupre, G.Shaw: "Ground-Based search for X rays generated by thunderstorms and lightning" Journal of Geophysical Research. 101. 23505-23516 (1996)J.Slusser, K.Hammond, A.Kylling, K.Stamnes, L.Perliski, A.Dahlback, D.Anderson, R.Demajistre:

[Publications] "Comparison of air mass computations" Journal of Geophysical Research. 101. 24655-24659 (1996)

[Publications] W.Sun, Y.Kamide, S.-I Akasofu: "Substorm current in the equatorial plane of the magnetosphere declared from ground-based magnetometer chain records" Journal of Geophysical Research. 101. 24655-24659 (1996)

[Publications] G.Hernandez, J.M.Forbes, R.W.Smith, Y.Portnyagin, J.F.Booth, N.Makarov: "Simultaneous mesospheric wind measurements near South Pole by optical and meteor redar methods" G.R.L.23. 1079-1082 (1996)

[Publications] P.M.Kintner, J.Bonnell, R.Arnoldy, K.Lyneh, C.Pollock, T.Moore, J.Holtet, C.Deehr, H.Stenbaek-Nielsen, R.Smith J.Olson J.Moen: "The SCIFER experiment" G.R.L.23. 1865-1868 (1996)

田中正之東北大学, 理学部, 教授 (90004340)