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2003 Fiscal Year Final Research Report Summary

Modification of equatorial disturbances over Indonesia maritime continent and its climatological significance

Research Project

Project/Area Number 13440141
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field Meteorology/Physical oceanography/Hydrology
Research InstitutionKobe University

Principal Investigator

YAMANAKA Manabu d.  Kobe University, Graduate School of Science and Technology, Professor, 大学院・自然科学研究科, 教授 (30183982)

Co-Investigator(Kenkyū-buntansha) HASHIGUCHI Hiroyuki  Kyoto University, RASC, Associate Professor, 宙空電波科学研究センター, 助教授 (90293943)
MORI Shuichi  F ORSGC/JAMSTEC, Researcher, PD研究員
OGINO Shinya  Kobe University, Graduate School of Science and Technology, Research Associate, 大学院・自然科学研究科, 助手 (80324937)
IWAYAMA Takahiro  Kobe University, Graduate School of Science and Technology, Associate Professor, 大学院・自然科学研究科, 助教授 (10284598)
Project Period (FY) 2001 – 2003
KeywordsIndonesia maritime continent / intra-seasonal variations / convective cloud activity / inertio-gravity waves / local circulation / monsoon circulation / quasi-biennial oscillations / El Nino-southern oscillation
Research Abstract

The objective of this study was to clarify the modification and re-organization of equatorial convective cloud disturbances over the Indonesia maritime continent between Indian and Pacific Oceans. We did (i) establishment of study infrastructure, (ii) construction of database, (iii) analysis of convective cloud systems and their organization, and (iv) theoretical consideration on convection system organization.
In the first year (FY 2001) we constructed (i) by installing a computer. We collected observational data for (ii), and analyzed them for (iii). We also started to study (iv). In the second year (FY 2002) we compared (ii) with data of satellite observations and objective analysis. Concerning (iii), we found out a giant diurnal cycle of cloud systems over the whole of Sumatera Island : Generation along the central mountain ridge during afternoon and midnight, and movement both westward and eastward until morning. We also found suppression of such a diurnal cycle in a dry phase of infra-seasonal variations (intermediate of super cloud clusters) moving eastward from Indian Ocean. Concerning (iv), we studied the equation system for horizontal convection (or inertio-gravity waves) which describing both local and meridional circulations.
In the final year (FY 2003) we complete the study. As for (iii) we found that the diurnal cycle of westward movement appears more frequently (almost throughout a year over the whole of Sumatera Island), whereas the eastward movement is limited inside the inter-tropical convergence zone (ITCZ) shifting north-southward over Sumatera Island with an annual cycle. Concerning (iv) a numerical calculation was also tried to simulate the diurnal cycle of cloud generation and movement.
These results were presented in international meetings and journals, and summarized in a report booklet.

  • Research Products

    (27 results)

All Other

All Publications (27 results)

  • [Publications] Ogino, S.-Y.: "Meridional and temporal variations of lower-stratospheric gravity-wave activity over Japan, west Pacific Ocean and east Indian Ocean"Advances in Space Research. 27(8). 1475-1478 (2001)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Widiyatmi, I.: "Examination of 3-6 day disturbances over equatorial Indonesia based on boundary layer radar observations during 1996-1999 at Serpong, Biak and Bukittinggi"J.Meteor.Soc.Japan. 79. 317-331 (2001)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Renggono, F.: "Precipitating clouds observed by 1.3-GHz L-band boundary layer radars in equatorial Indonesia"Annales Geophysicae. 19. 889-897 (2001)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Hamada, J.-I.: "Spatial and temporal variations of the rainy season over Indonesia and their link to ENSO"J.Meteor.Soc.Japan. 80. 285-310 (2002)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Murata, F.: "Relationship between wind and precipitation observed with a UHF radar, GPS rawinsonde and surface meteorological instruments at Kototabang, West Sumatera during September-October 1998"J.Meteor.Soc.Japan. 80. 347-360 (2002)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Dhaka, S.K.: "Observable signatures of a convectively generated wave field over the tropics using Indian MST Radar at Gadanki(13.5N,79.2E)"Geophys.Res.Lett.. 29. 1872-1875 (2002)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Fujiwara, M.: "Ozonesonde soundings in the Indonesian maritime continent in September-October 1998 and in August-September 1999"Atmos.Environ.. 37. 353-362 (2003)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Shibagaki, Y.: "Meso-alpha-scale wind field and precipitating clouds in Typhoon 9426(Orchid) observed by the MU radar"J.Meteor.Soc.Japan. 81. 211-228 (2003)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Wu, P.-M.: "Diurnal variation of precipitable water over a mountaneous area in Sumatera Island"J.Appl.Meteor.. 42. 1107-1115 (2003)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Okamoto, N.: "Seasonal variation of tropospheric wind over Indonesia : Comparison between collected operational rawinsonde data and NCEP reanalaysis for 1992-99"J.Meteor.Soc.Japan. 81. 829-850 (2003)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Dhaka, S.K.: "Gravity wave generation in the lower stratosphere due to passage of the typhoon 9426(Orchid) observed by the MU radar at Shigaraki(34.85N,136.10E)"J.Geophys.Res.. 108(D19). 4595,doi:10.1029 2003JD003489 (2003)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Mori, S.: "Diurnal rainfall peak migrations around Sumatera Island, Indonesian maritime continent observed by TRMM satellite and intensive rawinsonde soundings"Mon.Wea.Rev.. 132(印刷中). (2004)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 松本 淳, 山中大学, 他: "東南アジアのモンスーン気候学"日本気象学会. 320 (2002)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Fukao, S.: "Middle atmosphere response to forcing from above and below. Advances in Solar-Terrestrial Physics"TERRAPUB/D.Reidel(印刷中). (2004)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Ogino, S.-Y.: "Meridional and temporal variations of lower-stratospheric gravity-wave activity over Japan, west Pacific Ocean and east Indian Ocean"Advances in Space Research. 27(8). 1475-1478 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Widjyatmi, I.: "Examination of 3-6 day disturbances over equatorial Indonesia based on boundary layer radar observations during 1996-1999 at Serpong, Biak and Bukittinggi"J.Meteor.Soc.Japan. 79. 317-331 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Renggono, F.: "Precipitating clouds observed by 1.3-GHz L-band boundary layer radars in equatorial Indonesia"Annales Geophysicae. 19. 889-897 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Hamada, J.-I.: "Spatial and temporal variations of the rainy season over Indonesia and their link to ENSO"J.Meteor.Soc.Japan. 80. 285-310 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Murata, F.: "Relationship between wind and precipitation observed with a UHF radar, GPS rawinsonde and surface meteorological instruments at Kototabang, West Sumatera during September-October 1998"J.Meteor.Soc.Japan. 80. 347-360 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Dhaka, S.K.: "Observable signatures of a convectively generated wave field over the tropics using Indian MST Radar at Gadanki (13.5N, 79.2E)."Geophvs.Res.Lett.. 29. 1872-1875 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Fujiwara, M.: "Ozonesonde soundings in the Indonesian maritime continent in September-October 1998 and in August-September 1999"Atmos.Environ.. 37. 353-362 (2003)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Shibagaki, Y.: "Meso-alpha-scale wind field and precipitating clouds in Typhoon 9426 (Orchid) observed by the MU radar."J.Meteor.Soc.Japan. 81. 211-228 (2003)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Wu, -M.: "Diurnal variation of precipitable water over a mountaneous area in Sumatera Island"J.Appl.Meteor.. 42. 1107-1115 (2003)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Okamoto, N.: "Seasonal variation of tropospheric wind over Indonesia : Comparison between collected operational rawinsonde data and NCEP reanalysis for 1992-99"J.Meteor.Soc.Japan. 81. 829-850 (2003)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Dhaka, S.K.: "Gravity wave generation in the lower stratosphere due to passage of the typhoon 9426 (Orchid) observed by the at Shigaraki (34.85N, 136.IOE)"J.Geophys.Res.. 108(D). 4595,doi:10.10292003JD003489 (2003)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Mori, S.: "Diurnal rainfall peak migrations around Sumatera Island, Indonesian maritime continent observed by TRIMM satellite and intensive rawinsonde soundings."Mon.Wea.Rev.. 132(in press). (2004)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Fukao, S.: "Middle atmosphere response to forcing from above and below."Advances in Solar-Terrestrial Physics (TERRAPUB/D.Reidel). (in press). (2004)

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

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Published: 2005-04-19  

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