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1993 Fiscal Year Final Research Report Summary

A new type research on hydrographic state using satellite-derived sea surface temperature, sea surface height, and solar insulation

Research Project

Project/Area Number 04640408
Research Category

Grant-in-Aid for General Scientific Research (C)

Allocation TypeSingle-year Grants
Research Field 気象・海洋・陸水学
Research InstitutionTOHOKU UNIVERSITY

Principal Investigator

KAWAMURA Hiroshi  Tohoku University, Faculty of Science, professor, 理学部, 教授 (40169769)

Project Period (FY) 1992 – 1993
KeywordsOceanic Variation / Satellite-derived sea surface temperature / Satellite altimeter / Satellite-derived sea surface height / Satellite-estimated solar insulation / Tohoku Area
Research Abstract

Using satellite-derived Sea Surface Temperature (SST), Sea Surface Height (SSH), and Solar Insulation, hydrographic state around Japan is investigated.
Main results of the research is ;
1.Derivation systems of the SST from AVHRR data and the SSH from the Topex altimeter data have been established.
2.The sea surface cooling event caused by the passage of typhoons is found in the Tohoku area. The reason of the event is examined using the satellite SST,hydrographic observation data, and the numerical model, and is proved to be related to the vertical mixing of the strong wind and the stratification condition in the Tohoku Area.
3.The SSHs derived from the Topex altimeter data are compared with the hydrographic observation data in the Tohoku Area. The satellite SSH has an rms error of about 13cm. The comparison with the SST images is also made, and good agreement is proved.
4.A derivation method of the daily solar insulation over the ocean is developed, and one year estimation of the insulation is made. The validation of the estimated insulation using ship-observed insulation data shows an rms error of about 20W/m^2.
5.The hydrographic state in the Pacific ocean off the Hokkaido is investigated using the Topex SST and the hydrographic observation data. The geostrophic velocities estimated from the SSH agrees well with those measured by moored current meter. The correlation coefficient is 0.55 and the rms error is 7.6cm/s. The combination of the satellite SSH,SST,and the hydrographic data is proved to contribute to detailed analyzes of the hydrographic state in this area.
6.Using the satellite SST and SSH,wavy patterns propagating toward west at around the Subtropical front is found. The pattern has a wavelength of 800-1000km, and the phase speed of 7-8cm/s, and a characteristic period of 3-6months.

  • Research Products

    (12 results)

All Other

All Publications (12 results)

  • [Publications] 川村宏・境田太樹: "東北海圧における台風通過時の海面水温急変と海面フラックスに関する考察" 月刊海洋. 24(6). 385-388 (1992)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Kawamura,H.,S.Kizu,F.Sakaida and N.Ebuchi.: "Validation results of the satellite-derived parameters for the oceanography in the north western pacific ocean." ENVIRONMENT'93,eds. A.Liu and M.Fung,Hong Kong University of Science and Technology.231-244 (1993)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Kawamura,H.and S.Kizu.: "Distribution of the solar radiation in Japan estimated from VISSR/GMS3 in 1987-1988" IGARSS'93,by IEEE,Kogakuin University.4. 2147-2149 (1993)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 磯口治・川村宏・河野時廣・川崎庸寛: "海面高度計と海洋観測データを用いた北海道南沖合域の海況変動-1992年10〜11月の事例解析" 海の研究. (1995)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Sakaida,F.,H.Kawamura and Y.Toba: "Sea Surface Cooling caused by typhoons in the Tohoku AREA In August 1989" J.Geophys.Res. (1995)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 川村寛・澤庸介・境田太樹: "衛星観測による亜熱帯前線の3-6カ月変動の検出" 海と空.

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Kawamura, H.and F.Sakaida: "Consideration on Sea surface cooling and sea surface fluxes during typhoon passage in the Tohoku Area" Gekkan-Kaiyo. VOL.24, No.6. 389-391 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Kawamura, H., S.Kizu, F.Sakaida and N.Ebuchi: "Validation results of the satellite-derived parameters for the oceanography in the north western Pacific ocean" ENVIRONMENT'93, eds.A.Liu and M.Fung, Hong Kong University of Science and Technology. 231-244 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Kawamura, H.and S.Kizu: "Distribution of the solar radiation in Japan estimated from VISSR/GMS3 in 1987-1988" IGARSS'93, Spons.by IEEE,Kogakuin Univ., Tokyo, AUG.18-21,1993. Vol.4. 2147-2149 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Isoguchi, O., H.Kawamura, T.Kono, and Y.Kawasaki: "Variation of the hydrographic conditions as seen by an altimeter and hydrographic data in the srea aouth of Hokkaido ISLAND---A case study in October-November, 1992" Umino-Kenkyuu. (in press). (1995)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Sakaida, F., H.Kawamura and Y.Toba: "Sea Surface Cooling caused by typhoons in the Tohoku AREA In August 1989" J.Geophys.Res.(submitted). (1995)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Kawamura.H., Y.Sawa, and F.Sakaida: "Satellite observations of 3-6months variation in the Kuroshio and the Subtropical front" Umi-to-sora. 8195 (in press).

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

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Published: 1999-03-09  

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