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2009 Fiscal Year Final Research Report

Study of transport and photochemistry around the tropical tropopause using Chemistry Climate Models

Research Project

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Project/Area Number 19740283
Research Category

Grant-in-Aid for Young Scientists (B)

Allocation TypeSingle-year Grants
Research Field Meteorology/Physical oceanography/Hydrology
Research InstitutionHokkaido University

Principal Investigator

FUJIWARA Masatomo  Hokkaido University, 大学院・地球環境科学研究院, 准教授 (00360941)

Project Period (FY) 2007 – 2009
Keywords熱帯 / 対流圏界面 / 輸送 / 光化学 / 数値モデル
Research Abstract

There exists significant sub-seasonal variability in temperature and other parameters around the tropical troomuse. This is due to equatorial waves, intra-seasonal oscillations (ISOs), and other disturbances that are generated by tropical organized convection. Therefore, appropriate representation of tropical convection and tropical disturbances is crucial even for the Chemistry Climate Models (CCMs) that simulate and project stratospheric ozone, since these waves significantly influence the stratosphere-troposphere transport processes and help determine the coldest temperatures, affecting the dehydration processes in the tropical tropopause region. In this study, the wave activity in temperature and zonal and meridional winds at 100hPa in the tropics is analyzed for four CCMs that produced high time frequency winds and temperatures (CCSRNIES, CMAM, MRI, and WACCM) and for five reanalysis data sets (ERA40, ERA-Interim, JRA25, NCEP/NCAR (NCEP1), and NCEP-DEO AMIP-II (NCEP2)), using a zo … More nal-wavenumber-frequency spectral analysis method with a equatorially symmetric-antisymmetric decomposition.
Features commonly observed in all data sets are equatorial Kelvin waves and mixed RossbY gravity OMRG) waves. ISOs, at frequencies smaller than O. 05 cycle per day, are mostly not statistically significant with respect to the background spectra estimated here; however, largest power is found in these regions. The activity for equatorial Kelvin waves, MRG waves, and symmetric eastward-moving ISO is defined as the integration of power spectral density in the respective zonal-wavenumber-frequency region for each wave/disturbance. The statistical significance is considered only for Kelvin and MRG waves. The ISO activity here is the upper limit. Results indicate that five reanalysis data sets have very different wave activities. The Kelvin and MRG wave activities in ERAs are 2-3 times greater than those in NCEPs; those in JRA25 are close to the average. The ISO activity (the upper limit) is rather similar for the five reanalysis data sets. The wave activities in the four CCMs are generally within the range of those in the reanalysis data. WACCM shows the greatest Kelvin and MRG wave activities, which are comparable to those in ERAs. CCSRNIES shows the smallest Kelvin wave activity, and MRI shows the smallest MRG activity. The ISO activity (the upper limit) in the CCMs is greater than that in the five reanalysis data sets except for CCSRNIES.
The above results indicate that the reanalysis data currently available do not give the actual wave activities due to their large discrepancy. Analysis of radiosonde data and GPS occultation temperature data is necessary to investigate the actual wave activities. Less

  • Research Products

    (22 results)

All 2010 2009 2008 2007

All Journal Article (9 results) Presentation (13 results)

  • [Journal Article] Analysis of the tropical tropopause layer using the Nonhydrostatic ICosahedral Atmospheric Model (NICAM): Aqua-planet experiments, Journal of Geophysical Research2010

    • Author(s)
      Kubokawa, H., M. Fujiwara, T. Nasuno, M. Satoh
    • Journal Title

      (in press)

  • [Journal Article] SPARC CCMVal Report on the Evaluation of Chemistry-Climate Models, V. Eyring, T.G. Shepherd, D.W. Waugh (Eds. ), SPARC Report No. 5, WCRP-X, WMO/TD-No. X, available online at2010

    • Author(s)
      SPARC CCMVal
    • Journal Title

      藤原はChapter 7のco-authorのひとり

  • [Journal Article] Cirrus observations in the tropical tropopause layer over the western Pacific, Journal of Geophysical Research2009

    • Author(s)
      Fujiwara, M., S. Iwasaki, A. Shimizu, Y. Inai, M. Shiotani, F. Hasebe, I. Matsui, N. Sugimoto, H. Okamoto, N. Nishi, A. Hamada, T. Sakazaki, K. Yoneyama
    • Journal Title

      114

      Pages: D09304

  • [Journal Article] Correction of radiosonde pressure and temperature measurements using simultaneous GPS height data, Scientific Online Letters on the Atmosphere2009

    • Author(s)
      Inai, Y., F. Hasebe, K. Shimizu, M. Fujiwara
    • Journal Title

      5

      Pages: 109-112

  • [Journal Article] Multi-model assessment of the upper troposphere and lower stratosphere: Tropics and trends, Journal of Geophysical Research, submitted2009

    • Author(s)
      Gettekman, A., M. I. Hegglin, S-W. Son, J. Kim, M. Fujiwara, T. Birner, S. Kremser, M. Rex, J. A. Anel, J. Austin, J. F. Lamarque, H. Akiyoshi, D. Plummer, T. G. Shepherd, J. Scinocca, M. Michou, H. Teyssedre, M. Dameris, H. Garny, C. Bruhl, P. Jockel. S. Pawson, S. Bekki, K. Shibata, D. Smale, E. Rozanov, E. Mancini, G. Pitari, O. Morgenstern, M. Chipperfield, S. Dhomse, W. Tian, N. Butchart, S. C. Hardiman, P. Braesike, J. A. Pyle, D. E. Kinnison
  • [Journal Article] Correction for radiation dry bias found in RS92 radiosonde data during the MISMO field experiment, Scientific Online Letters on the Atmosphere2008

    • Author(s)
      Yoneyama, K., M. Fuj i ta, N. Sato, M. Fuj iwara, Y. Inai, F. Hasebe
    • Journal Title

      4

      Pages: 13-16

  • [Journal Article] Ozonesonde observations at Christmas Island (2N, 157W) in the equatorial central Pacific, Journal of Geophysical Research2008

    • Author(s)
      Takashima, H., M. Shiotani, M. Fujiwara, N. Nishi, F. Hasebe
    • Journal Title

      113

      Pages: D10112

  • [Journal Article] Correlation between equatorial Kelvin waves and the occurrence of extremely thin ice clouds at the tropical tropopause, Atmospheric Chemistry and Physics2008

    • Author(s)
      Immler, F., K. Kruger, M. Fujiwara, G. Verver, M. Rex, O. Schrems
    • Journal Title

      8

      Pages: 4019-4026

  • [Journal Article] 成層圏対流圏結合2007

    • Author(s)
      藤原正智, 山崎孝治
    • Journal Title

      天気 54

      Pages: 597-600

  • [Presentation] Seasonal to decadal variations of water vapor in the tropical lower stratosphere observed with balloon-borne frost-point hygrometers2009

    • Author(s)
      M. Fujiwara, 他11名
    • Organizer
      IGAC-SPARC Joint Workshop
    • Place of Presentation
      京都市
    • Year and Date
      20091025-20091026
  • [Presentation] Seasonal to long-term variations of water vapor in the tropical lower stratosphere observed with balloon傭orne hygrometers2009

    • Author(s)
      M. Fujiwara, 他11名
    • Organizer
      17th Conference on Atmospheric and Oceanic Fluid Dynamics and 15th Conference on Middle Atmosphere
    • Place of Presentation
      Stowe, VT, USA
    • Year and Date
      20090608-20090612
  • [Presentation] 気球搭載水蒸気計により観測された熱帯下部成層圏の水蒸気の季節~長期変動2009

    • Author(s)
      藤原正智, 他12名
    • Organizer
      第3回赤道大気レーダーシンポジウム・第129回生存圏シンポジウム
    • Place of Presentation
      京都大学宇治
    • Year and Date
      2009-09-11
  • [Presentation] Observations of ozone, water vapor, and cirrus in the tropical tropopause layer over the Pacific2009

    • Author(s)
      Fuiiwara, M.
    • Organizer
      SPARC 4th General Assembly
    • Place of Presentation
      ボローニャ、イタリア
    • Year and Date
      2009-09-04
  • [Presentation] 気球搭載水蒸気計により観測された熱帯下部成層圏の水蒸気の季節~長期変動2009

    • Author(s)
      藤原正智, 他11名
    • Organizer
      日本地球惑星科学連合2009年大会
    • Place of Presentation
      千葉市幕張メッセ
    • Year and Date
      2009-05-21
  • [Presentation] 熱帯下部成層圏における水蒸気の長期変動(1)2008

    • Author(s)
      藤原正智, 他8名
    • Organizer
      日本気象学会2008年度秋季大会
    • Place of Presentation
      仙台国際センター(仙台市青葉区青葉山)
    • Year and Date
      20081119-20081121
  • [Presentation] 西太平洋の熱帯対流圏界層(TTL)におけるcirrusの観測2008

    • Author(s)
      藤原正智, 他12名
    • Organizer
      第2回赤道大気レーダーシンポジウム・第105回生存圏シンポジウム
    • Place of Presentation
      宇治市
    • Year and Date
      20080925-20080926
  • [Presentation] 熱帯西太平洋域における水蒸気・オゾンゾンデ観測キャンペーン(2007年1月・2008年1月)2008

    • Author(s)
      藤原正智, 他8名
    • Organizer
      日本地球惑星科学連舎2008年大会
    • Place of Presentation
      千葉市幕張メッセ
    • Year and Date
      20080525-20080530
  • [Presentation] SHADOZデータによる熱帯オゾンの季節変動と年々変動2008

    • Author(s)
      森岡浩・藤原正智, 他4名
    • Organizer
      日本地球惑星科学連合2008年大会
    • Place of Presentation
      千葉市
    • Year and Date
      20080525-20080530
  • [Presentation] 熱帯西太平洋の対流圏界面領域におけるCirrusの観測2007

    • Author(s)
      藤原正智, 他13名
    • Organizer
      日本気象学会秋季大会
    • Place of Presentation
      北海道大学
    • Year and Date
      20071014-20071016
  • [Presentation] Cirrus observations in the tropical tropopause layer over the western Pacific2007

    • Author(s)
      Fujiwara, M., 他13名
    • Organizer
      14th Conference on the Middle Atmosphere
    • Place of Presentation
      Portland, USA
    • Year and Date
      20070820-20080824
  • [Presentation] Cirrus observations in the tropical tropopause layer over the western Pacific2007

    • Author(s)
      Fujiwara, M., 他13名
    • Organizer
      AGU fall meeting
    • Place of Presentation
      San Francisco, USA
    • Year and Date
      2007-12-12
  • [Presentation] Cirrus observations in the troPical troPoPause layer over the western Pacific2007

    • Author(s)
      Fujiwara, M., 他14名
    • Organizer
      日本地球惑星科学連合2007年大会
    • Place of Presentation
      千葉市幕張メッセ
    • Year and Date
      2007-05-30

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Published: 2011-06-18   Modified: 2016-04-21  

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