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2005 Fiscal Year Final Research Report Summary

Study on the dehydration processes in the tropical tropopause layer

Research Project

Project/Area Number 15204043
Research Category

Grant-in-Aid for Scientific Research (A)

Allocation TypeSingle-year Grants
Section一般
Research Field Meteorology/Physical oceanography/Hydrology
Research InstitutionHOKKAIDO UNIVERSITY

Principal Investigator

HASEBE Fumio  Hokkaido Univ., Fac. of Env. Earth Sci., Prof., 大学院地球環境科学研究院, 教授 (00261735)

Co-Investigator(Kenkyū-buntansha) SHIOTANI Masato  Kyoto Univ., Res. Inst. Sustainable Humanosphere, Prof., 生存圏研究所, 教授 (50192604)
FUJIWARA Masatomo  Hokkaido Univ, Fac. Of Env. Earth Sci., Asso. Prof., 大学院地球環境科学研究院, 助教授 (00360941)
NISHI Noriyuki  Kyoto Univ., Fac. of Env. Sci., Inst, 大学院理学研究科, 助手 (00222183)
SHIBATA Takashi  Nagoya Univ., Fac. of Env. Sci., Asso. Prof., 大学院環境学研究科, 助教授 (70167443)
IWASAKI Toshiki  Tohoku Univ., Fac. of Sci., Prof., 大学院理学研究科, 教授 (80302074)
Project Period (FY) 2003 – 2005
Keywordstropics / dehydration / tropical tropopause layer / sonde observation / numerical modeling / water vapor / long-term trend / stratosphere
Research Abstract

Ozone and water vapor sonde observations were conducted in December 2003, December 2004 to January 2005, and December 2005 to January 2006 for the purpose of studying the dehydration processes in the tropical tropopause layer (TTL) and estimating long-term trend of water vapor in the tropical lower stratosphere. Appreciable water vapor trend has not been detected so far. Observational stations were chosen along the air trajectory in the TTL at Tarawa, Biak, Bandung, Kototabang, and Hanoi. The opportunity of "Mirai" cruise was also taken. There found good correspondence between the retained amount of water in the air and the coldness the corresponding air mass experienced prior to observation. Water vapor "match" in which the same air parcel is observed twice or more along the trajectories is useful to make such estimates more reliable. Analyses are currently under way paying special attention to the estimation of observational uncertainty in the sonde data, objective identification of "match" pairs, detection of penetrating convective clouds, and consideration of possible bias in the meteorological field. Lidar observations of subvisible cirrus clouds (SVC) were also made to supplement sonde observations. It will enable us to infer the altitude of SVC in the water vapor profiles and to know the atmospheric condition surrounding the ice particle in SVC. Detailed investigation is under way for the case where the degree of super saturation shows interesting change in the SVC. For the modeling study, on the other hand, a new framework with the use of mass-weighted isentropic zonal mean was established. It was used to study the role of transport in the seasonal variation of total ozone. The impact of changing assimilated meteorological variables on ozone simulations is also investigated. These results will be extended in the successive studies in the future.

  • Research Products

    (36 results)

All 2005 2004 2003

All Journal Article (36 results)

  • [Journal Article] The winter ozone minimum over the subtropical northwestern Pacific2005

    • Author(s)
      Han, J.-Y.
    • Journal Title

      J. Meteor. Soc. Japan 83

      Pages: 57-67

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Diagnosis of meridional ozone transport based on mass weighted isentropic zonal means2005

    • Author(s)
      Miyazaki, K.
    • Journal Title

      J. Atmos. Sci. 62

      Pages: 1192-1208

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] The roles of transports in seasonal variation of total ozone amount2005

    • Author(s)
      Miyazaki, K.
    • Journal Title

      J. Geophys. Res. 110・D18309

      Pages: doi:10.1029/2005JD005900

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] The impact of changing meteorological variables to be assimilated into GCM on ozone simulation with MRI CTM2005

    • Author(s)
      Miyazaki, K.
    • Journal Title

      J. Meteorol. Soc. Japan 83

      Pages: 909-918

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] New characteristics of the tropical tropopause revealed by CHAMP/GPS measurements2005

    • Author(s)
      Ratnam, M. V.
    • Journal Title

      SOLA 1

      Pages: 185-188

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Correlations and emission ratios among bromoform, dibromochloromethane, and dibromomethane in the atmosphere2005

    • Author(s)
      Yokouchi, Y.
    • Journal Title

      J. Geophys. Res. 110・D23309

      Pages: doi:10.1029/2005JD006303

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] The winter ozone minimum over the subtropical northwestern Pacific2005

    • Author(s)
      Han, J., K.Yamazaki, M.Niwano
    • Journal Title

      J. Meteorol. Soc. Japan 83

      Pages: 57-67

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Diagnosis of meridional ozone transport based on mass weighted isentropic zonal means2005

    • Author(s)
      Miyazaki, K., T.Iwasaki
    • Journal Title

      J. Atmos. Sci. 62

      Pages: 1192-1208

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Roles of transport in the seasonal variation of the total ozone amount2005

    • Author(s)
      Miyazaki, K., T.Iwasaki, K.Shibata, M.Deushi
    • Journal Title

      J. Geophys. Res. 110, D18309, doi:10.1029/2005JD005900

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] The impact of changing meteorological variables to be assimilated into GCM on ozone simulation with MRI CTM2005

    • Author(s)
      Miyazaki, K., T.Iwasaki, K.Shibata, M.Deushi, T.T.Sekiyama
    • Journal Title

      J. Meteorol. Soc. Japan 83(5)

      Pages: 909-918

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] New characteristics of the tropical tropopause revealed by CHAMP/GPS measurements2005

    • Author(s)
      Ratnam, M.V., T.Tsuda, M.Shiotani, M.Fujiwara
    • Journal Title

      SOLA 1, 185-188, doi:10.2151/sola.2005-048

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Correlations and emission ratios among bromoform, dibromochloromethane, and dibromomethane in the atmosphere2005

    • Author(s)
      Yokouchi, Y., F.Hasebe, M.Fujiwara, H.Takashima, M.Shiotani, N.Nishi, Y.Kanaya, S.Hashimoto, P.Fraser, D.Toom-Sauntry, H.Mukai, Y.Nojiri
    • Journal Title

      J. Geophys. Res. 110, D23309, doi:10.1029/2005JD006303

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Intraseasonal variations of water vapor and cirrus clouds in the tropical upper troposphere2004

    • Author(s)
      Eguchi, N.
    • Journal Title

      J. Geophys. Res. 109, D12106

      Pages: doi:10.1029/2003JD004314

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Radiation balance of the tropical tropopause layer2004

    • Author(s)
      Gettelman, A.
    • Journal Title

      J. Geophys. Res. 109, D07103

      Pages: doi:10.1029/2003JD004190

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Dynamical properties of the tropical atmosphere derived from radiosonde observations at San Cristobal and Singapore2004

    • Author(s)
      Hasebe, F.
    • Journal Title

      J. Meteor. Soc. Japan 82

      Pages: 1129-1145

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Eliassen-Palm flux diagnosis based on isentropic representation2004

    • Author(s)
      Tanaka, D.
    • Journal Title

      J. Atmos. Sci. 61

      Pages: 2370-2383

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] A Numerical Study on the Development of Tracers by Cumulus Convection in TOGA COARE2004

    • Author(s)
      Yasunaga, K.
    • Journal Title

      J. Meteor. Soc. Japan 82

      Pages: 861-878

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Intraseasonal variations of water vapor and cirrus clouds in the tropical upper Intraseasonal variations of water vapor and cirrus clouds in the tropical upper troposphere2004

    • Author(s)
      Eguchi, N., M.Shiotani
    • Journal Title

      J. Geophys. Res. 109, D12106, doi:10.1029/2003JD004314

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Radiation balance of the tropical tropopause layer2004

    • Author(s)
      Gettelman, A., P.M.de F.Forster, M.Fujiwara, Q.Fu, H.Voemel, L.K.Gohar, C.Johanson, M.Ammerman
    • Journal Title

      J. Geophys. Res. 109, D07103, doi:10.1029/2003JD004190

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Dynamical properties of the tropical atmosphere derived from radiosonde observations at San Cristobal and Singapore2004

    • Author(s)
      Hasebe, F., H.Koyata
    • Journal Title

      J. Meteorol. Soc. Japan 82(4)

      Pages: 1129-1145

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Eliassen-Palm flux diagnosis based on isentropic representation2004

    • Author(s)
      Tanaka, D., T.Iwasaki, S.Uno, M.Ujiie, K.Miyazaki
    • Journal Title

      J. Atmos. Sci. 61

      Pages: 2370-2383

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] A numerical study on the detrainment of tracers by cumulus convection in TOGA COARE2004

    • Author(s)
      Yasunaga, K., H.Kida, T.Satomura, N.Nishi
    • Journal Title

      J. Meteorol. Soc. Japan 82

      Pages: 861-878

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Performance of the Meteolabor "Snow White" chilled-mirror hygrometer in the tropical troposphere2003

    • Author(s)
      Fujiwara, M.
    • Journal Title

      J. Atmos. Oceanic Technol 20・11

      Pages: 1534-1542

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Upper-tropospheric inversion and easterly jet in the tropics2003

    • Author(s)
      Fujiwara, M.
    • Journal Title

      J. Geophys. Res. 108・D24

      Pages: 4796, doi:10.1029/2003JD003928

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Turbulence at the tropopause due to breaking Kelvin waves observed by the Equatorial Atmosphere Rader2003

    • Author(s)
      Fujiwara, M.
    • Journal Title

      Geophys. Res. Lett. 30・4

      Pages: 1171, doi:10.1029/2002GL016278

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Seasonal and QBO variations of ascent rate in the tropical lower stratosphere as inferred from UARS HALOE trace gas data2003

    • Author(s)
      Niwano, M.
    • Journal Title

      J. Geophys. Res. 108・D24

      Pages: 4794, doi:10.1029/2003JD003871

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] The behavior of the Snow White chilled-mirror hygrometer in extremely dry conditions2003

    • Author(s)
      Voemel, H.
    • Journal Title

      J. Atmos. Oceanic Technol. 20・11

      Pages: 1560-1567

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Xelvin-Helmholtz instability around the tropical tropopause observed with the Equatorial Atmosphere Radar2003

    • Author(s)
      Yamamoto, M. K.
    • Journal Title

      Geophys. Res. Lett. 30・9

      Pages: 1476, doi:10.1029/2002GL016685

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Correction to "Kelvin-Helmholtz instability around the tropical tropopause observed with the Equatorial Atmosphere Radar"2003

    • Author(s)
      Yamamoto, M. K.
    • Journal Title

      Geophys. Res. Lett. 30・13

      Pages: 1716, doi:10.1029/2002GL017791

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Performance of the Meteolabor "Snow White" chilled- mirror hygrometer in the tropical troposphere : Comparisons with the Vaisala RS80 A/H-Humicap sensors2003

    • Author(s)
      Fujiwara, M., M.Shiotani, F.Hasebe, H.Voemel, S.J.Oltmans, P.W.Ruppert, T.Horinouchi, T.Tsuda
    • Journal Title

      J. Atmos. Oceanic Technol. 20

      Pages: 1534-1542

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Upper-tropospheric inversion and easterly jet in the tropics2003

    • Author(s)
      Fujiwara, M., S.-P.Xie, M.Shiotani, H.Hashizume, F.Hasebe, H.Voemel, S.J.Oltmans, T.Watanabe
    • Journal Title

      J. Geophys. Res. 108(D24), 4796, doi:10.1029/2003JD003928

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Turbulence at the tropopause due to breaking Kelvin waves observed by the Equatorial Atmosphere Radar2003

    • Author(s)
      Fujiwara, M., M.K.Yamamoto, H.Hashiguchi, T.Horinouchi, S.Fukao
    • Journal Title

      Geophys. Res. Lett. 30(4), 1171, doi:10.1029/2002GL016278

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Seasonal and QBO variation of ascent rate in the tropical lower stratosphere as inferred from UARS HALOE trace gas data2003

    • Author(s)
      Niwano, M., K.Yamazaki, M.Shiotani
    • Journal Title

      J. Geophys. Res. 108(D24), 4794, doi:10.1029/2003JD003871

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] The behavior of the Snow White chilled-mirror hygrometer in extremely dry conditions2003

    • Author(s)
      Voemel, H., M.Fujiwara, M.Shiotani, F.Hasebe, S.J.Oltmans, J.E.Barnes
    • Journal Title

      J. Atmos. Oceanic Technol. 20

      Pages: 1560-1567

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Kelvin-Helmholtz instability around the tropical tropopause observed with the Equatorial Atmosphere Radar2003

    • Author(s)
      Yamamoto, M.K., M.Fujiwara, T.Horinouchi, H.Hashiguchi, S.Fukao
    • Journal Title

      Geophys. Res. Lett. 30(9), 1476, doi:10.1020/2002GL016685

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Correction to "Kelvin- Helmholtz instability around the tropical tropopause observed with the Equatorial Atmosphere Radar"2003

    • Author(s)
      Yamamoto, M.K., M.Fujiwara, T.Horinouchi, H.Hashiguchi, S.Fukao
    • Journal Title

      Geophys. Res. Lett. 30(13), 1716, doi:10.1020/2002GL017791

    • Description
      「研究成果報告書概要(欧文)」より

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Published: 2008-05-27  

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