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Studies on oceanic CO2 uptake in and around Kuroshio

Research Project

Project/Area Number 16310001
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field Environmental dynamic analysis
Research InstitutionHokkaido University

Principal Investigator

YOSHIKAWA Hisayuki  Hokkaido Univ., Facility of Environmental Earth Science., Professor, 大学院地球環境科学研究院, 教授 (60344496)

Co-Investigator(Kenkyū-buntansha) NORIKI Shinichiro  Hokkaido Univ., Faculty of Environmental Earth Science, Professor, 大学院地球環境科学研究院, 教授 (80109511)
NAKATSUKA Takeshi  Hokkaido Univ., Low temperature Institute, Associate Professor, 低温科学研究所, 助教授 (60242880)
Project Period (FY) 2004 – 2006
Project Status Completed (Fiscal Year 2006)
Budget Amount *help
¥14,500,000 (Direct Cost: ¥14,500,000)
Fiscal Year 2006: ¥4,500,000 (Direct Cost: ¥4,500,000)
Fiscal Year 2005: ¥4,400,000 (Direct Cost: ¥4,400,000)
Fiscal Year 2004: ¥5,600,000 (Direct Cost: ¥5,600,000)
KeywordsCarbonate system / Kuroshio / subtropical gyre / Seasonal variation / Long-term trend / Net community production / Bioloogical activity / Carbon isotopic ratio / 二酸化炭素分圧 / 群集基礎生産 / 親生物元素 / 亜熱帯
Research Abstract

In order to examine the oceanic CO_2 uptake and factors controlling it in and around Kuroshio, measurements of partial pressure of CO_2 (pCO_2), dissolved inorganic carbon (DIC), stable carbon isotopic ratio (^<13>C/^<12>C) of DIC were made at least four times a year in the western North Pacific Subtropical Gyre (NPSG) over the period from 2004 to 2006. In the NPSG, seasonal variation in pCO_2 was mainly controlled by the temperature and biological activity. The former was caused by the thermodynamic temperature effect on carbonate system. From winter to summer, the net community production was estimated to be in the range from 10 to 26 mmol m^<-2> day^<-1> based on measurements of concentration and ^<13>C/^<12>C of DIC. Dueto the oceanic uptake of anthropogenic CO_2, the pCO_2 in surface seawater has increased at a rate (1.6 μatm yr^<-1>) which is nearly equal to that of the air. In the western North Pacific (5-35°N, 132-142ー°E) the air-sea CO_2 flux over the 1990s was estimated to be in the range from 16 to 52 Mt-C yr^<-1> with a mean value of 32Mt-C yr^<-1>. During winter season, the CO_2 flux south of the Kuroshio was about 3 mole m^<-2> yr^<-1>, which was relatively large as compared with those of the average of the world ocean. We have also examined the relationship between chemical constituents of sinking particles and biological activity in the surface mixed layer. Further, we have developed a eco-system model including nitrogen isotope, and used it to discuss the nitrogen cycle in the equatorial Pacific and the Sea of Okhotsuk. Details of our results are given in scientific journals.

Report

(4 results)
  • 2006 Annual Research Report   Final Research Report Summary
  • 2005 Annual Research Report
  • 2004 Annual Research Report
  • Research Products

    (47 results)

All 2006 2005 2004 Other

All Journal Article (43 results) Book (4 results)

  • [Journal Article] Seasonal variation of partial pressure of carbon dioxide (pCO_2) in the subarctic/subtropical North Pacific utilizing a container ship MS Alligator Liberty, a voluntary observation ship.2006

    • Author(s)
      Ogawa
    • Journal Title

      Papers of Meteorology and Geophysics 57

      Pages: 37-46

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Journal Article] Estimation of basin-scale pCO_2 distribution using satellite SST, Chl a and climatological salinity in the North Pacific.2006

    • Author(s)
      Sarma
    • Journal Title

      Global Biogeochemical Cycles 20

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Journal Article] Interannual variability of winter oceanic CO_2 and air-sea CO_2 flux in the western North Pacific for two decades.2006

    • Author(s)
      Midorikawa
    • Journal Title

      Journal of Geophysical Research 111

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Journal Article] Temporal and spatial variations of oceanic pCO_2 and air-sea CO_2 flux in the Greenland and Barents Seas based on observations from 1992 to 2001.2006

    • Author(s)
      Nakaoka
    • Journal Title

      Tellus 58B

      Pages: 148-161

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Journal Article] Nitrate-nitrogen isotopic patterns in surface waters of the western and central equatorial Pacific.2006

    • Author(s)
      Yoshikawa
    • Journal Title

      Journal of Oceanography 62

      Pages: 511-525

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Journal Article] Distribution of N^* in the Sea of Okhotsk and its use as a biogeochemical tracer of Okhotsk Sea Intermediate Water formation process.2006

    • Author(s)
      Yoshikawa
    • Journal Title

      Journal of Marine Systems 63

      Pages: 49-62

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Journal Article] Global Climate Change and Response of Carbon Cycle in the equatorial Pacific and Indian Oceans and Adjacent Landmasses.2006

    • Author(s)
      Inoue-Yoshikawa et al.
    • Journal Title

      Elsevier

      Pages: 470-470

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Journal Article] Seasonal variation of partial pressure of carbon dioxide (pCO_2) in the subarctic/subtropical North Pacific utilizing a container ship MS Alligator Liberty, a voluntary observation ship2006

    • Author(s)
      Ogawa et al.
    • Journal Title

      Papers of Meteorology and Geophysics 57

      Pages: 37-46

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Journal Article] Estimation of basin-scale pCO_2 distribution using satellite SST, Chl a and climatological salinity in the North Pacific.2006

    • Author(s)
      Sarma et al.
    • Journal Title

      Global Biogeochemical Cycles 20, GB3005, doi:10.1029/2005GB002594

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Journal Article] Interannual variability of winter oceanic CO_2 and air-sea CO_2 flux in the western North Pacific for two decades.2006

    • Author(s)
      Midorikawa et al.
    • Journal Title

      Journal of Geophysical Research 111, C07S02, doi: 10.1029/2005JC003095

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Journal Article] Temporal and spatial variations of oceanic pCO_2 and air-sea CO_2 flux in the Greenland and Barents Seas based on observations from 1992 to 2001.2006

    • Author(s)
      Nakaoka et al.
    • Journal Title

      Tellus 58B

      Pages: 148-161

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Journal Article] Nitrate-nitrogen isotopic patterns in surface waters of the western and central equatorial Pacific.2006

    • Author(s)
      Yoshikawa et al.
    • Journal Title

      Journal of Oceanography 62

      Pages: 511-525

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Journal Article] Distribution of N^* in the Sea o Okhotsk and its use as a biogeochemical tracer o Okhotsk Sea Intermediate Water formation process.2006

    • Author(s)
      Yoshikawa et al.
    • Journal Title

      Journal of Marine Systems 63

      Pages: 49-62

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Journal Article] Seasonal variation of partial pressure of carbon dioxide (pCO_2) in the subarctic/subtropical North Pacific utilizing a container ship MS Alligator Liberty, a voluntary observation ship.2006

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

      Pap. Met. Geophys 57

      Pages: 37-46

    • Related Report
      2006 Annual Research Report
  • [Journal Article] Estimation of basin-scale pCO_2 distribution using satellite SST, Chl a and climatological salinity in the North Pacific.2006

    • Author(s)
      Sarma, V.V.S.S.
    • Journal Title

      Global Biogeochem. Cycles 20

    • Related Report
      2006 Annual Research Report
  • [Journal Article] Interannual variability of winter oceanic CO_2 and air-sea CO_2 flux in the western North Pacific for two decades.2006

    • Author(s)
      Midorikawa, T.
    • Journal Title

      J. Geophys. Res. 111

    • Related Report
      2006 Annual Research Report
  • [Journal Article] Temporal and spatial variations of oceanic pCO_2 and air-sea CO_2 flux in the Greenland and Barents Seas based on observations from 1992 to 2001.2006

    • Author(s)
      Nakaoka, S.
    • Journal Title

      Tellus 58B

      Pages: 148-161

    • Related Report
      2006 Annual Research Report
  • [Journal Article] Nitrate-nitrogen isotopic patterns in surface waters of the western and central equatorial Pacific.2006

    • Author(s)
      Yoshikawa, C.
    • Journal Title

      Journal of Oceanography 62

      Pages: 511-525

    • Related Report
      2006 Annual Research Report
  • [Journal Article] Distribution of N in the Sea of Okhotsk and its use as a biogeochemical tracer of Okhotsk Sea Intermediate Water formation process.2006

    • Author(s)
      Yoshikawa, C.
    • Journal Title

      Journal of Marine Systems 63

      Pages: 49-62

    • Related Report
      2006 Annual Research Report
  • [Journal Article] 海洋環境変化と化学物質の移動フラックス2006

    • Author(s)
      乗木新一郎
    • Journal Title

      月刊海洋 38

      Pages: 376-381

    • Related Report
      2006 Annual Research Report
  • [Journal Article] Nitrogen isotopic patterns of nitrate in surface waters of the western and central equatorial Pacific2006

    • Author(s)
      Yoshikawa, C., Y.Yamanaka, T.Nakatsuka
    • Journal Title

      Journal of Oceanography 62(in press)

    • Related Report
      2005 Annual Research Report
  • [Journal Article] Variations and trends of CO_2 in the surface seawater in the Southern Ocean south of Australia between 1969 and 2002.2005

    • Author(s)
      Inoue-Yoshikawa
    • Journal Title

      Tellus 57B

      Pages: 58-69

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Journal Article] Persistently strong oceanic CO_2 sink in the western subtropical North Pacific.2005

    • Author(s)
      Midorikawa
    • Journal Title

      Geophysical Research Letter 32

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Journal Article] Relationship between composition of settling particles and organic carbon flux in the western North Pacific and the Japan Sea.2005

    • Author(s)
      Otosaka, S.
    • Journal Title

      Journal of Oceanography 61

      Pages: 25-40

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Journal Article] An ecosystem model including nitrogen isotopes : Perspectives on a study of the marine nitrogen cycle.2005

    • Author(s)
      Yoshikawa
    • Journal Title

      Journal of Oceanography 61

      Pages: 921-942

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Journal Article] Transition of low-salinity water in the Western Pacific Warm Pool recorded in the nitrogen isotopic ratios of settling particles.2005

    • Author(s)
      Yoshikawa
    • Journal Title

      Geophysical Research Letter 32

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Journal Article] Variations and trends of CO_2 in the surface seawater in the Southern Ocean south of Australia between 1969 and 2002.2005

    • Author(s)
      Inoue-Yoshikawa et al.
    • Journal Title

      Tellus 57B

      Pages: 58-69

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Journal Article] Persistently strong oceanic CO_2 sink in the western subtropical North Pacific.2005

    • Author(s)
      Midorikawa et al.
    • Journal Title

      Geophysical Research Letter 32, L05612, doi:10.1029/2004GL021952

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Journal Article] Relationship between composition of settling particles and organic carbon flux in the western North Pacific and the Japan Sea.2005

    • Author(s)
      Otosaka, S., S.Noriki
    • Journal Title

      Journal of Oceanography 61

      Pages: 25-40

    • NAID

      10014273248

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Journal Article] An ecosystem model including nitrogen isotopes : Perspectives on a study of the marine nitrogen cycle.2005

    • Author(s)
      Yoshikawa et al.
    • Journal Title

      Journal of Oceanography 61

      Pages: 921-942

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Journal Article] Transition of low-salinity water in the Western Pacific Warm Pool recorded in the nitrogen isotopic ratios of settling particles.2005

    • Author(s)
      Yoshikawa et al.
    • Journal Title

      Geophysical Research Letter 32, L14615, doi:10.1029/2005GL023103

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Journal Article] Persistently strong oceanic CO_2 sink in the western subtropical North Pacific2005

    • Author(s)
      Midorikawa T. et al.
    • Journal Title

      Geophysical Research Letter 32,No5

    • Related Report
      2005 Annual Research Report
  • [Journal Article] Variations and trends of CO_2 in the surface seawater in the Southern Ocean south of Australia between 1969 and 20022005

    • Author(s)
      Yoshikawa-Inoue, H., M.Ishii
    • Journal Title

      Tellus 57B

      Pages: 58-69

    • Related Report
      2005 Annual Research Report
  • [Journal Article] Transition of low-salinity water in the Western Pacific Warm Pool recorded in the nitrogen isotopic ratios of settling particles2005

    • Author(s)
      Yoshikawa, C., T.Nakatsuka, H.Kawahata
    • Journal Title

      Geophysical Research Letter 32

    • Related Report
      2005 Annual Research Report
  • [Journal Article] Relationship between composition of settling particles and organic carbon flux in the western North Pacific and Japan Sea.2005

    • Author(s)
      Otosaka, Noriki
    • Journal Title

      J.Ocenography 61

      Pages: 25-40

    • NAID

      10014273248

    • Related Report
      2004 Annual Research Report
  • [Journal Article] La/Yb and Th/Sc in settling particles : vertical and horizontal transport of lithogenic material in the western North Pacific.2004

    • Author(s)
      Otosaka
    • Journal Title

      Geochemical Journal 38

      Pages: 515-525

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Journal Article] Methane standard gases for atmospheric measurements at the MRI and JMA and intercomparison experiments2004

    • Author(s)
      Matsueda
    • Journal Title

      Papers of Meteorology and Geophysics 54

      Pages: 91-104

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Journal Article] Methane in the western part of the Sea of Okhotsk in 1998-2000.2004

    • Author(s)
      Yoshida
    • Journal Title

      Journal of Geophysical Research 109

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Journal Article] La/Yb and Th/Sc in settling particles : vertical and horizontal transport of lithogenic material in the western North Pacific.2004

    • Author(s)
      Otosaka et al.
    • Journal Title

      Geochemical Journal 38

      Pages: 515-525

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Journal Article] Global Environmental Change in the Ocean and Land.2004

    • Author(s)
      Ishii et al.
    • Journal Title

      TERRAPUB 560

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Journal Article] Methane standard gases for atmospheric measurements at the MRI and JMA and intercomparison experiments.2004

    • Author(s)
      Matsueda et al.
    • Journal Title

      Papers of Meteorology and Geophysics 54

      Pages: 91-104

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Journal Article] Methane in the western part of the Sea of Okhotsk in 1998-2000.2004

    • Author(s)
      Yoshida et al.
    • Journal Title

      Journal of Geophysical. Research 109,C09S12,doi:10.1029/2003JC001910

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Journal Article] Persistently strong oceanic CO_2 sink in the western subtropical North Pacific

    • Author(s)
      Midorikawa et al.
    • Journal Title

      Geophys.Res.Lett. (印刷中)

    • Related Report
      2004 Annual Research Report
  • [Book] Global Climate Change and Response of Carbon Cycle in the equatorial Pacific and Indian Oceans and Adjacent Landmasses2006

    • Author(s)
      Inoue-Yoshikawa
    • Total Pages
      470
    • Publisher
      Elsevier
    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Book] Long-term trend of the partial pressure of CO_2 in surface waters and sea-air CO_2 flux in the equatorial Pacific. In "Global Climate Change and Response of Carbon Cycle in the equatorial Pacific and Indian Oceans and Adjacent Landmasses"2006

    • Author(s)
      Inoue H.Y., et al.
    • Total Pages
      470
    • Publisher
      Elsevier
    • Related Report
      2006 Annual Research Report
  • [Book] Global Environmental Change in the Ocean and Land2004

    • Author(s)
      Ishii
    • Total Pages
      560
    • Publisher
      TERRAPUB
    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Book] Variability of surface layer CO_2 parameters in the western and central Equatorial Pacific. In "Global Environmental Change in the Ocean and Land"2004

    • Author(s)
      Ishii et al.
    • Publisher
      TERRAPUB
    • Related Report
      2004 Annual Research Report

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Published: 2004-04-01   Modified: 2016-04-21  

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