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2003 Fiscal Year Final Research Report Summary

New development of gas and energy flux measurement system over sea surface

Research Project

Project/Area Number 13554014
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section展開研究
Research Field Meteorology/Physical oceanography/Hydrology
Research InstitutionOKAYAMA UNIVERSITY

Principal Investigator

TSUKAMOTO Osamu  Okayama University, Faculty of Science, Professor, 理学部, 教授 (40027298)

Co-Investigator(Kenkyū-buntansha) IWATA Toru  Okayama University, Faculty of Environmental Science and Technology, Research Assistant, 環境理工学部, 助手 (10304338)
MAITANI Toshihiko  Okayama University, Research Institute for Bioresearches, Professor, 資源生物科学研究所, 教授 (00025412)
OHTAKI Eiji  Okayama University, Faculty of Environmental Science and Technology, Professor, 環境理工学部, 教授 (40033120)
ISHIDA Hiroshi  Okayama University, Faculty of Maritime Sciences, Kobe University, Professor, 海事科学部, 教授 (60031473)
Project Period (FY) 2001 – 2003
KeywordsSea surface flux / Air-sea interaction / Sea surface heat balance / Carbon dioxide / Gas exchange / Eddy-covariance method / Eddy flux / On-board measurement
Research Abstract

On-board eddy flux measurement system were developed into a real-time data processing system with a new program on a laptop computer. The new system were setup on the R/V MIRAI, JAMSTEC since 2002. In addition to the energy flux measurement, new infrared gas analyzer were installed for the measurement of CO2 flux over the ocean. This is a unique system as a tool for the direct CO2 flux measurement without empirical transfer velocity. Her cruise extends from tropics to the Arctic areas, and her cruise extended to the round trip in southern hemisphere during 2003.
A large amount of turbulence data were accumulated and quality control of the raw data is the most important after the cruise. A various kinds of trials were experienced to select a good datasets. Finally, a suitable algorithm of the quality control are established.
Based on the selected data, surface flux distributions were analyzed for the energy, water vapor and carbon dioxide. Comparing the surface fluxes of heat and water vapor, the results were almost consistent with the bulk estimates. However, the magnitude of the CO2 eddy flux were much larger than the traditional bulk estimates. And in some cases, the direction of the CO2 transport conflict between the two method. This is a new finding of the present project for the solution of the "missing sink" of CO2.
In the present project, we have developed a new automated measurement system including energy and gas flux over ocean. The conflict of the CO2 flux should be solved as the next project by careful examinations of eddy-covariance method and the bulk method as the cooperation between ocean chemist group.

  • Research Products

    (16 results)

All Other

All Publications (16 results)

  • [Publications] Tsukamoto Osamu: "Automatic eddy flux measurement system on-board"Proc.WCRP/SCOR Workshop on Intercomparison and Validation of Ocean-Atmosphere Flux Field, Potomac, USA,2001. WCRP-115. 342-345 (2001)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 塚本 修: "航行する船舶上での海面乱流フラックスの自動観測"第5回みらいシンポジウム予稿集,海洋科学技術センター. 93-94 (2001)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 河野 雄彦: "西部北太平洋におけるpCO2の水平・鉛直分布の観測"海と空. 78. 7-18 (2002)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Tsukamoto Osamu: "On-board eddy flux measurement of CO2 over Arctic Ocean"Proc.4th International Workshop on Global Change : Connection to the Arctic 2003 (GCCA4). 43-47 (2003)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Tsukamoto Osamu: "CO2 eddy flux measurement over sea surface"Proc.of International Workshop on Flux Observation and Research in Asia. 46-47 (2003)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 谷口 大介: "クローズドパス法による地表面CO2フラックスの評価"日本気象学会関西支部例会講演要旨集. 102. 9-12 (2004)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 塚本 修: "地表面フラックス測定法(気象研究ノート 第199号)"日本気象学会. 242 (2001)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Osamu Tsukamoto: "Automatic eddy flux measurement system on-board"Proc.WCRP/SCOR Workshop on Intercomparison and Validation of Ocean-Atmosphere Flux Field, (Potomac, USA). WCRP-115. 342-345 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Osamu Tsukamoto: "Automated measurement of sea surface eddy fluxes on a cruising ship"Proc.5th MIRAI symposium, JAMSTEC (Yokohama, Japan). 93-94 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Takehiko Kono: "Observations of horizontal and vertical distributions of pCO2 in the western north Pacific (in Japanese with English abstract)"Umi to Sora (Sky and Sea). 78. 7-18 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Satoshi Takahashi: "Automated real-tune eddy flux measurement system on a cruising ship"Proc.INMARTEC 2002 (Yokosuka, Japan). 40-40 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Osamu Tsukamoto: "On-board direct CO2 flux measurement with eddy covariance method over open ocean"Proc.International Union of Geodesy and Geophysics(IUGG) 2003 (Sapporo, Japan). A.62-A.62 (2003)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Osamu Tsukamoto: "Real-time on-board sir-sea flux measurement system with eddy covariance method"Proc.International Union of Geodesy and Geophysics(IUGG) 2003 (Sapporo, Japan). B.103-B.103 (2003)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Osamu Tsukamoto: "On-board eddy flux measurement of CO2 over Arctic Ocean"Proc.4th International Workshop on Global Change : Connection to the Arctic 2003 (Toyokawa, Japan). 43-47 (2003)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Osamu Tsukamoto: "CO2 eddy flux measurement over sea surface"Proc.of International Workshop on Flux Observation and Research in Asia (Beijing, China). 46-47 (2003)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Daisuke Taniguchi: "Surface CO2 flux measurement with the closed-path eddy-covariance method"Proc.Kansai-meeting of the Meteorological Society of Japan (Kobe, Japan). 102. 9-12 (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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