2006 Fiscal Year Final Research Report Summary
Dynamics of the antarctic Ozone Hole
| Project/Area Number |
17540417
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Meteorology/Physical oceanography/Hydrology
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| Research Institution | The University of Tokyo |
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Principal Investigator |
SATO Kaoru The University of Tokyo, Graduate School of Science, Professor, 大学院理学系研究科, 教授 (90251496)
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| Co-Investigator(Kenkyū-buntansha) |
YAMAMORI Miho Tsuru University, Faculty of Letters, Lecture, Lecturer, 文学部, 講師 (80392728)
TOMIKAWA Yoshihiro The University of Tokyo, National Institute of Polar Research, Project Researcher, 国立極地研究所, プロジェクト研究員 (20435499)
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| Project Period (FY) |
2005 – 2006
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| Keywords | Ozone hole / Transport / Planetary waves / Gravity waves / Polar vortex / Soywa Station / ILAS-II |
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| Research Abstract |
Using data from intensive ozonesonde observation at Syowa Station in the Antarctic and from satellite onboard Improved Limb Atmospheric Spectrometer-II (ILAS-II) in 2003, detailed analysis was made to elucidate the dissipation mechanism of the Antarctic ozone hole. It was shown from the tracer-tracer correlation analysis and backward trajectory analysis that the ozone recovery started before the polar vortex breaking, by the Brewer-Dobson circulation and lateral mixing between inside and outside the polar vortex.
Using intensive radiosonde observation data at Syowa Station in 2002, seasonal variation of gravity wave characteristics were analyzed. It was shown that significant amount of gravity waves propagate energy downward in the periods when the polar vortex was stable and when the polar vortex breaking proceeded. Local Rossby number and the parameters estimated by the hodograph analysis indicated that the gravity waves were generated by the spontaneous adjustment mechanism around th
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e polar vortex.
Ozone lamina observed inside the Antarctic ozone hole observed were examined in terms of their characteristics and causes. Based on ozonesonde data at Syowa Station and Neumayer Station, it was shown that ozone lamina with a vertical depth of 0.4 to 1.4 km frequently appear in the height region of 14-19km where the ozone mixing ratio is quite low. Using backward trajectory analysis, it was revealed that these lamina were originated from the boundary region of the polar vortex.
We analyzed ozone mixing ratio, temperature and horizontal wind velocities in the height region up to 30 km from ozonesonde observations at Fairbanks, Alaska in August, 2003. First, dominant vertical scales observed in the ozone fluctuations were examined using vertical wavenumber spectra. Next, the contribution from atmospheric gravity waves to the fine structure of ozone in the lower stratosphere was quantitatively estimated. About 20% of ozone variance was explained by the vertical displacement mostly due to gravity waves. Less
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[Journal Article] Ozone profiles in the high-latitude stratosphere and lower mesosphere measured by the Improved Limb Atmospheric Spectrometer (ILAS)-II Comparison with other satellite sensors and ozonesondes2006
Author(s)
T.Sugita, H.Nakajima, T.Yokota, H.Kanzawa, H.Gernandt, A.Herber, P.von der Gathen, G.Konig-Langlo, K.Sato, 他30名
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Journal Title
J. Geophys. Res. 111
Pages: D11S02, doi:10.1029/2005JD006439
Description
「研究成果報告書概要(和文)」より
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[Journal Article] Ozone profiles in the high-latitude stratosphere and lower mesosphere measured by the Improved Limb Atmospheric Spectrometer (ILAS)-II : Comparison with other satellite sensors and ozonesondes.2006
Author(s)
T.Sugita, H.Nakajima, T.Yokota, H.Kanzawa, H.Gernandt, A.Herber, P.von der Gathen, G.Konig-Langlo, K.Sato, V.Dorokhov, V.Yushkov, Y.Murayama, M.Yamamori, S.Godin-Beekmann, F.Goutail, H.Roscoe, T.Deshler, M.Yela, P.Taalas E.Kyro, S.Oltmans, B.Johnson, M.Allaart, Z.Litynska, A.Klekociuk, S.B.Andersen, G.braathen, H.D.Backer, C.Randall, R.Bevilacqua, G.Taha, L.Thompson, H.Irie, M.Ejiri, N.Saitoh, T.Tanaka.Y.Terao, H.Kobayashi, Y.Sasano
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Journal Title
J.Geophys.Res. 111(doi:10.1029/2005JD006439)
Pages: D11S02
Description
「研究成果報告書概要(欧文)」より
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[Journal Article] Arctic Study of Tropospheric Aerosol and Radiation (ASTAR) 2000:Arctic haze case study.2005
Author(s)
T.Yamanouchi, R.Treffeisen, A.Herber, M.Shiobara, S.Yamagata, K.Hara, K.Sato, M.Yabuki, Y.Tomikawa, A.Rinke, R.Neuber, R.Schumachter, M.Kriews, J.Strom, O.Schrems, H.Gernandt
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Journal Title
Tellus 57B
Pages: 141-152
Description
「研究成果報告書概要(欧文)」より
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