Studies on the air-sea CO2 exchange in the Southern Ocean

2010 Fiscal Year Final Research Report

• Project/Area Number: 20310002
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: Environmental dynamic analysis
• Research Institution: Hokkaido University
• Principal Investigator: YOSHIKAWA Hisayuki (井上 久幸) Hokkaido University, 大学院・地球環境科学研究院, 教授 (60344496)
• Co-Investigator(Kenkyū-buntansha): MIDORIKAWA Takashi 気象庁気象研究所, 地球化学研究部, 部長 (10414517) ; HASHIDA Gen 国立極地研究所, 気水圏研究グループ, 助教 (00280537)
• Co-Investigator(Renkei-kenkyūsha): ISHII Masao 気象庁気象研究所, 地球化学研究部, 室長 (70354553) ; SASANO Daisuke 気象庁気象研究所, 地球化学研究部, 研究官 (10462524)
• Project Period (FY): 2008 – 2010
• Keywords: 物質循環

Research Abstract

We have conducted observational studies with the main objective of clarifying air-sea CO_2 flux and factors controlling it in the Southern Ocean. Measurements of partial pressure of CO_2, dissolved inorganic carbon, pH, and dissolved oxygen were made in the Southern Ocean over the period from December to January in FY2009 and FY2010. Observed results indicate that biological activity plays an important role in determining temporal/spatial distribution of air-sea CO_2 flux. By combining historical data, we determined the long-term increase of partial pressure of CO_2 in surface seawater and decrease of pH, mainly due to the oceanic CO_2 uptake.

Research Products

• [Journal Article] Ocean acidification in the coastal zone off the south coast of Honshu, Japan. (2011)
  • Author(s): Ishii M., Kosugi N., Sasano D., Saito S., Midorikawa T., Inoue H.Y.
  • Journal Title: J.Geophys.Res. accepted.
  • Peer Reviewed
• [Journal Article] Biogenic methane distribution in the South Pacific and the Southern Ocean in austral summer, 2001-2002 (2011)
  • Author(s): Yoshida O., Inoue H.Y., Suzuki K., Watanabe S., Noriki D.
  • Journal Title: J.Geophys.Res. accepted.
  • Peer Reviewed
• [Journal Article] Decreasing trend of pH estimated from the time series of carbonate parameters observed in the western North Pacific for a quarter century (2010)
  • Author(s): Midorikawa T., Ishii M., Saito S., Sasano D., Kosugi N., Motoi T., Kamiya H., Nakadate A., Nemoto K., Inoue H.Y.
  • Journal Title: Tellus 62B Pages: 649-659
  • Peer Reviewed
• [Journal Article] Air-sea CO_2 flux in the mid-latitude western and eastern North Pacific (2010)
  • Author(s): Takamura T., Inoue H.Y., Midorikawa T., Ishii M., Nojiri Y.
  • Journal Title: J.Met.Soc.Jpn. 88, No6 Pages: 899-914
  • Peer Reviewed
• [Journal Article] Effect of snow, snow melting, and re-freezing processes on air-sea ice CO_2 flux,. (2010)
  • Author(s): Nomura D., Inoue H.Y., Toyota T., Shirasawa K.
  • Journal Title: J.Glaciol. 56, No196 Pages: 262-270
  • Peer Reviewed
• [Journal Article] Seasonal and interannual variation of oceanic carbon cycling in the western and eastern tropical-subtropical North Pacific: a physical-biological modeling study. (2009)
  • Author(s): Fujii M., Chai F., Shi L., Inoue H.Y., Ishii M.
  • Journal Title: J.Oceanogr. 65, No5 Pages: 689-701
  • Peer Reviewed
• [Journal Article] Variations of oceanic pCO_2 and air-sea O_2 flux in the eastern Indian sector of the Southern Ocean for the austral summer of 2001-2002 (2009)
  • Author(s): Nakaoka S., Nakazawa T., Inoue H.Y., Aoki S., Hashida G., Ishii M., Yamanouchi T., Odate T., Fukuchi M.
  • Journal Title: Geophys.Res.Lett. 36 Pages: L14610, doi:10.1029/2009GL038467
  • Peer Reviewed
• [Journal Article] Photosynthetic features and primary productivity of phytoplankton in the Oyashio and Kuroshio-Oyashio transition regions of the northwest Pacific (2009)
  • Author(s): Isada T., Kuwata A., Saito. H., Ono T., Ishii M., Inoue H.Y., Suzuki K.
  • Journal Title: J.Plankton Res. 31 Pages: 1009-1025
  • Peer Reviewed
• [Journal Article] Spatial variability and decadal trend of the oceanic CO_2 in the western equatorial Pacific warm/fresh water. (2009)
  • Author(s): Ishii M., Inoue H.Y., Saito S., Tokieda T., Sasano D., Midorikawa T., Nakadate A., Nemoto K., Metzl N., Sabine C.R., Feely R., Wanninkhof R., Wong C.S.
  • Journal Title: Deep-Sea Res., II 56 Pages: 591-606
  • Peer Reviewed
• [Journal Article] Continuous observations of atmospheric and oceanic CO_2 using the moored buoy in the East China Sea : Variations during the passage typhoons. (2009)
  • Author(s): Nemoto K., Midorikawa T., Ogawa K., Takatani S., Wada A., Ishii M., Inoue H.Y.
  • Journal Title: Deep-Sea Research II 56 Pages: 542-553
  • Peer Reviewed
• [Journal Article] Transport of chemical components in sea ice and under-ice water during melting in the seasonally ice-covered Saroma-ko Lagoon, Hokkaido, Japan. (2009)
  • Author(s): Nomura D., Ishikawa M., Takatsuka T., Kawamura T., Shirasawa K., Inoue H.Y.
  • Journal Title: Estuarine, Coastal and Shelf Science 81 Pages: 201-209
  • Peer Reviewed
• [Journal Article] Climatological Mean and Decadal Change in Surface Ocean pCO_2, and Net Sea-air CO_2 Flux over the Global Oceans (2009)
  • Author(s): Takahashi T., Sutherland S.C., Inoue H.Y., 他, Ishii M., 他, Midorikawa T., 他
  • Journal Title: Deep-Sea Res., II 56 Pages: 554-577
  • Peer Reviewed
• [Presentation] Ocean Acidification States in the Indian Sector of the Southern Ocean relating to the secular trend and seasonal variation of Oceanic Carbon Dioxide. (2010)
  • Author(s): Hashida G., Nakazawa T., Aoki S., Nakaoka S., Inoue H.Y., Yamanouchi T., Odate T., Fukuchi M.
  • Organizer: IPY Oslo Science Conference
  • Place of Presentation: Oslo, Norway.
  • Year and Date: 20100608-20100612
• [Presentation] Temporal and Spatial Variations of Oceanic Inorganic Carbonates and Biological Activities in the Southern Ocean at Umitaka-maru cruises from 2005/06 to 2008/09. (2010)
  • Author(s): Nakaoka S., Inoue H.Y., Nakazawa T., Hashida G., Koitabashi M., Ishimaru T., Nojiri Y., Fukuchi M.
  • Organizer: IPY Oslo Science Conference
  • Place of Presentation: Oslo, Norway.
  • Year and Date: 20100608-20100612
• [Presentation] Long-term trends of surface ocean acidification in the Southern Ocean. (2010)
  • Author(s): Midorikawa T., Inoue H.Y., Ishii M., Sasano D., Hashida G., Nakaoka S., Kosugi N., Suzuki T.
  • Organizer: IPY Oslo Science Conference
  • Place of Presentation: Oslo, Norway.
  • Year and Date: 20100608-20100612
• [Presentation] Seasonal variation of dissolved inorganic carbon based on repeat observations in marginal ice zone along 140°E during austral spring 2001/02 (2009)
  • Author(s): Hashida G., Ono H., Inoue H.Y., Nakaoka S., Nakazawa T., Aoki S., Ishii M., Fukuchi M., Odate T., Yamanouchi T.
  • Organizer: 9th International Carbon Dioxide Conference
  • Place of Presentation: Jena, Germany.
  • Year and Date: 20090913-20090919
• [Presentation] Trend of carbon increase and oxygen decrease in the interior of the western North Pacific subtropical gyre. (2009)
  • Author(s): Ishii M., Sasano D., Kosugi N., Midorikawa T., Takatani Y., Tokieda T., Nakano T., Inoue H.Y.
  • Organizer: 9th International Carbon Dioxide Conference
  • Place of Presentation: Jena, Germany.
  • Year and Date: 20090913-20090919
• [Presentation] Trend of Acidification in the western North Pacific. (2008)
  • Author(s): Ishii M., Midorikawa T., Saito S., Tokieda T., Sasano D., Nakadate A., Inoue H.Y.
  • Organizer: 2^<nd> Symposium on the Ocean in High-CO_2 world
  • Place of Presentation: Monaco
  • Year and Date: 20081006-20081009
• [Book] 南極資料(南大洋オーストラリア区における表層海洋中の二酸化炭素分圧の経年変化と季節変化) (2011)
  • Author(s): 橋田元、中岡慎一郎、小野恒、中澤高清、吉川久幸、青木周司、森本真司、山内恭、小達恒夫、福地光男
  • Publisher: (印刷中)
• [Book] 地球変動研究の最前線を訪ねる(人間と大気・生物・土壌の環境) (2009)
  • Author(s): 吉川久幸
  • Total Pages: 439
  • Publisher: 清水弘文堂書房
• [Remarks] ホームページ等
  • URL: http://geos.ees.hokudai.ac.jp/hyoshika/index.html
• [Remarks]
  • URL: http://www.mri-jma.go.jp/Dep/ge/ge-sjis.html
• [Remarks]
  • URL: http://www.nipr.ac.jp/group/glaciology.html