Establishing the foundation of blue carbon studies by developing the methodology for the measurement of carbon stable isotopes in gases, liquids, and solids

• Project/Area Number: 26630251
• Research Category: Grant-in-Aid for Challenging Exploratory Research
• Allocation Type: Multi-year Fund
• Research Field: Civil and environmental engineering
• Research Institution: National Institute of Maritime, Port and Aviation Technology (2016); Port and Airport Research Institute (2014-2015)
• Principal Investigator: Kuwae Tomohiro 国立研究開発法人海上・港湾・航空技術研究所, 港湾空港技術研究所, グループ長 (40359229)
• Co-Investigator(Kenkyū-buntansha): 渡辺 謙太 国立研究開発法人海上・港湾・航空技術研究所, 港湾空港技術研究所, 研究官 (20725618)
• Project Period (FY): 2014-04-01 – 2017-03-31
• Project Status: Completed (Fiscal Year 2016)
• Budget Amount: ¥3,900,000 (Direct Cost: ¥3,000,000、Indirect Cost: ¥900,000); Fiscal Year 2015: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000); Fiscal Year 2014: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
• Keywords: 気候変動 / 二酸化炭素 / 生態系サービス / 環境計測 / 同位体 / 二酸化炭素吸収 / 安定同位体

Outline of Final Research Achievements

“Blue carbon”, which is carbon captured by marine living organisms, has recently been highlighted as significant carbon stocks due to the high burial rates and long-term sequestration. However, how much the atmospheric CO2 taken up through air-sea gas exchange is sequestered, as organic blue carbon in shallow coastal ecosystems, is unclear. Moreover, linkages between the dynamics of the organic carbon derived from multiple sources and the carbon sequestration are poorly understood. We developed the methodology for the measurement of carbon stable isotopes in gases, liquids, and solids to quantify the relative abundance of multiple carbon sources and establish the foundation of blue carbon studies.

Research Products

• [Int'l Joint Research] KAUST(Saudi Arabia)
• [Int'l Joint Research] KAUST(サウジアラビア)
• [Journal Article] A comparison of CO2 dynamics and air-water fluxes in a river-dominated estuary and a mangrove-dominated marine estuary (2016)
  • Author(s): Akhand, A., Chanda, A., Manna, S., Das, S., Hazra, S., Roy, R., Choudhury, S. B., Rao, K. H., Dadhwal, V. K., Chakraborty, K., Mostofa, K. M. G., Tokoro, T., Kuwae, T., Wanninkhof, R.
  • Journal Title: Geophysical Research Letters Volume: 43 Issue: 22 Pages: 11726-11735
  • DOI: 10.1002/2016gl070716
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] 渦相関法を用いた堆積物-海水境界面における酸素フラックスの直接測定 (2016)
  • Author(s): 桑江朝比呂
  • Journal Title: 海洋理工学会誌 Volume: 22 Pages: 47-56
  • NAID: 130005162861
  • Peer Reviewed
• [Journal Article] 春季出水期におけるコムケ湖の水質変動解析と大気－海水間CO2フラックスの推定 (2016)
  • Author(s): 田多一史・中山恵介・所立樹・渡辺謙太・桑江朝比呂
  • Journal Title: 土木学会論文集B3（海洋開発） Volume: 72
  • NAID: 130005263430
  • Peer Reviewed / Acknowledgement Compliant
• [Journal Article] 湧水に着目したコムケ湖の水質変動特性の把握 (2016)
  • Author(s): 田多一史・中山恵介・所立樹・渡辺謙太・桑江朝比呂
  • Journal Title: 土木学会論文集B2（海岸工学） Volume: 72
  • NAID: 130005282255
  • Peer Reviewed / Acknowledgement Compliant
• [Journal Article] 植生が浅海域の流動場にもたらす影響に関する現地調査と流動モデルによる数値解析 (2016)
  • Author(s): 茂木博匡・中川康之・渡辺謙太・所立樹・門谷茂・桑江朝比呂
  • Journal Title: 港湾空港技術研究所報告 Volume: 55(2) Pages: 35-60
  • NAID: 40020947985
  • Peer Reviewed
• [Journal Article] 河口浅海域におけるブルーカーボン-二酸化炭素の吸収および炭素隔離- (2016)
  • Author(s): 桑江朝比呂
  • Journal Title: 用水と廃水 Volume: 58 Pages: 60-66
• [Journal Article] Blue carbon in human-dominated estuarine and shallow coastal systems (2016)
  • Author(s): Kuwae T., J. Kanda, A. Kubo, F. Nakajima, H. Ogawa, A. Sohma, and M. Suzumura
  • Journal Title: Ambio Volume: 45 Pages: 290-301
  • Peer Reviewed / Open Access / Acknowledgement Compliant
• [Journal Article] How organic carbon derived from multiple sources contributes to carbon sequestration processes in a shallow coastal system? (2015)
  • Author(s): Watanabe, K., and T. Kuwae
  • Journal Title: Global Change Biology Volume: 21 Pages: 2612-2623
  • Peer Reviewed / Open Access / Acknowledgement Compliant
• [Journal Article] Radiocarbon isotopic evidence for assimilation of atmospheric CO2 by the seagrass Zostera marina (2015)
  • Author(s): Watanabe, K., and T. Kuwae
  • Journal Title: Biogeosciences Volume: 12 Pages: 6251-6258
  • Peer Reviewed / Open Access / Acknowledgement Compliant
• [Journal Article] 干潟における調整サービスの現況・持続可能性の定量評価 (2015)
  • Author(s): 渡辺謙太・桑江朝比呂・三戸勇吾・高橋俊之・大西晃輝・井芹絵里菜・秋山吉寛・吉田稔・鳥羽光晴・岡田知也
  • Journal Title: 土木学会論文集B2（海岸工学） Volume: 71
  • NAID: 130005109374
  • Peer Reviewed / Acknowledgement Compliant
• [Journal Article] 国内の様々な浅海域における海水中CO2分圧の実測と統計モデルによる予測 (2015)
  • Author(s): 田多一史・所立樹・渡辺謙太・茂木博匡・桑江朝比呂
  • Journal Title: 土木学会論文集B2（海岸工学） Volume: 71
  • NAID: 130005109484
  • Peer Reviewed / Acknowledgement Compliant
• [Journal Article] 渦相関法による沿岸域の大気中CO2吸収・放出量のデータ品質管理 (2015)
  • Author(s): 所立樹・桑江朝比呂
  • Journal Title: 土木学会論文集B2（海岸工学） Volume: 71
  • NAID: 130005109330
  • Peer Reviewed / Acknowledgement Compliant
• [Journal Article] 港湾におけるブルーカーボン（CO2吸収と炭素隔離）の計測手法のガイドライン (2015)
  • Author(s): 所立樹・渡辺謙太・田多一史・桑江朝比呂
  • Journal Title: 港湾空港技術研究所資料 Volume: 1309 Pages: 1-29
  • Peer Reviewed / Acknowledgement Compliant
• [Presentation] Projecting global value of climate change mitigation and adaptation by coastal ecosystems (2017)
  • Author(s): Kuwae, T.
  • Organizer: Blue Carbon Workshop- the role of coastal ecosystems in climate change mitigation and adaptation
  • Place of Presentation: KAUST, Saudi Arabia
  • Int'l Joint Research / Invited
• [Presentation] 北海道東部の潟湖における有機炭素貯留特性 (2017)
  • Author(s): 渡辺謙太・清家弘治・安達寛・柴沼成一郎・長坂洋光・所立樹・田多一史・門谷茂・桑江朝比呂
  • Organizer: 日本生態学会第64回大会
  • Place of Presentation: 早稲田大学
• [Presentation] Evaluation of the contribution of coral-derived organic matter to total sedimentary organic matter by elemental and isotopic analysis (2016)
  • Author(s): Tanaya, T., K. Watanabe, and T. Kuwae
  • Organizer: 13th International Coral Reef Symposium
  • Place of Presentation: Honolulu
  • Year and Date: 2016-06-17
  • Int'l Joint Research
• [Presentation] Dissolution of carbonate sediment at seagrass meadow estimated by total alkalinity flux and pore water profiles (2016)
  • Author(s): Yamamoto, S., Hajime Kayanne, Chuki Hongo, Toko Tanaya, Kenta Watanabe, Tomohiro Kuwae.
  • Organizer: 13th International Coral Reef Symposium
  • Place of Presentation: Honolulu
  • Year and Date: 2016-06-17
  • Int'l Joint Research
• [Presentation] Carbon Sequestration Processes in a Shallow Seagrass Meadow: Isotopic Approaches (2016)
  • Author(s): Watanabe K. and T. Kuwae
  • Organizer: The 2016 Ocean Science Meeting
  • Place of Presentation: New Orleans
  • Year and Date: 2016-02-21
  • Int'l Joint Research
• [Presentation] Evaluation of the eddy covariance method for the assesment of coastal CO2 flux (2016)
  • Author(s): Tokoro T. and T. Kuwae
  • Organizer: The 2016 Ocean Science Meeting
  • Place of Presentation: New Orleans
  • Year and Date: 2016-02-21
  • Int'l Joint Research
• [Presentation] Characteristics of organic carbon accumulation in subtropical seagrass meadows (2016)
  • Author(s): Tanaya, T., K. Watanabe, S. Yamamoto, C. Hongo, H. Kayanne, and T. Kuwae
  • Organizer: The 2016 Ocean Science Meeting
  • Place of Presentation: New Orleans
  • Year and Date: 2016-02-21
  • Int'l Joint Research
• [Presentation] Estimation of the Physical Environments Influenced by Seagrasses in a Shallow Coastal Water Using a Numerical Model (2016)
  • Author(s): Moki, H., K. Taguchi, Y. Nakagawa, K. Hata, and T. Kuwae
  • Organizer: The 2016 Ocean Science Meeting
  • Place of Presentation: New Orleans
  • Year and Date: 2016-02-21
  • Int'l Joint Research
• [Presentation] Ecological and biogeochemical impacts of internal waves on mesophotic coral ecosystems: testing eddy covariance and isotope approaches, Iriomote, Japan (2016)
  • Author(s): Wyatt, A., T. Miyajima, J. Leichter, T. Naruse, T. Kuwae, S. Yamamoto, N. Satoh, T. Nagata
  • Organizer: The 2016 Ocean Science Meeting
  • Place of Presentation: New Orleans
  • Year and Date: 2016-02-21
  • Int'l Joint Research
• [Presentation] Temporal Variability (Diurnal, Seasonal and Decadal Scale) of CO2 Dynamics and Air-Water CO2 Flux in a Tropical Macro-Tidal Estuary, East Coast of India (2016)
  • Author(s): Akhand, A., Chanda, A., Manna, S., Hazra, S. Kuwae, T.
  • Organizer: 2016 AGU Fall meeting
  • Place of Presentation: San Francisco
  • Int'l Joint Research
• [Presentation] The Development of a Hydrodynamic Model to Investigate the Effects of Submerged Aquatic Vegetation (SAV) Drag Force on the Current Field (2016)
  • Author(s): Moki, H., K. Taguchi, Y. Nakagawa, K. Hata, and T. Kuwae
  • Organizer: 7th India-Japan Symposium on Science and Technology for Sustainability (ISAJ Symposium-2016)
  • Place of Presentation: Tokyo
  • Int'l Joint Research / Invited
• [Presentation] Characteristics of coastal CO2 flux estimated from comparison of eddy covariance method with conventional methods (2016)
  • Author(s): Tokoro, T, and T. Kuwae
  • Organizer: Oceanflux Greenhouse Gases Evolution
  • Place of Presentation: Brest, France
  • Int'l Joint Research
• [Presentation] ブルーカーボン研究の将来：気候変動の緩和と適応の両得 (2015)
  • Author(s): 桑江朝比呂・伴野雅之・中川康之・相馬明郎・茂木博匡・渡辺謙太・所立樹・栗山善昭
  • Organizer: 海岸工学講演会
  • Place of Presentation: 東京
  • Year and Date: 2015-11-11
  • Invited
• [Presentation] 堆積物－水界面における渦相関法を用いた酸素フラックスの直接測定 (2015)
  • Author(s): 桑江朝比呂
  • Organizer: 海洋理工学会平成27年度秋季大会
  • Place of Presentation: 京都
  • Year and Date: 2015-10-29
  • Invited
• [Presentation] Estimation of carbon accumulation rate in shallow coastal waters using a numerical model (2015)
  • Author(s): Moki, H., K. Watanabe, K. Taguchi, Y. Tsuji, T. Tokoro, S. Montani, and T. Kuwae
  • Organizer: Meeting of Asia Oceania Geophysical Society (AOGS)
  • Place of Presentation: Singapore
  • Year and Date: 2015-08-02
  • Int'l Joint Research
• [Presentation] Evaluation of the Eddy Covariance Method for the Assessment of the Blue Carbon (2015)
  • Author(s): Tokoro T. and T. Kuwae
  • Organizer: 7th International Symposium on Gas Transfer at Water Surfaces
  • Place of Presentation: Seattle
  • Year and Date: 2015-05-18
  • Int'l Joint Research
• [Presentation] 沿岸海洋炭素循環モデルの基本構造について (2014)
  • Author(s): 茂木博匡・渡辺謙太・所立樹・桑江朝比呂
  • Organizer: 平成26年度海洋理工学会
  • Place of Presentation: 清水
  • Year and Date: 2014-11-14 – 2014-11-15
• [Presentation] 北海道風蓮湖における海草場起源のPOM輸送解析 (2014)
  • Author(s): 茂木博匡・渡辺謙太・所立樹・門谷茂・桑江朝比呂
  • Organizer: 平成26年度日本海洋秋季大会
  • Place of Presentation: 長崎
  • Year and Date: 2014-09-12 – 2014-09-17
• [Presentation] 沿岸生態系における炭素フロー：ブルーカーボン研究 (2014)
  • Author(s): 桑江朝比呂・所立樹・渡辺謙太・渡辺謙太・三好英一・茂木博匡・田多一史
  • Organizer: 日本地球惑星科学連合2014年大会
  • Place of Presentation: 幕張
  • Year and Date: 2014-05-01
  • Invited
• [Presentation] 河口域－海草場の堆積物に埋没する有機物の時空間的分布 (2014)
  • Author(s): 渡辺謙太・門谷茂・桑江朝比呂
  • Organizer: 日本地球惑星科学連合2014年大会
  • Place of Presentation: 幕張
  • Year and Date: 2014-04-28
• [Remarks] ブルーカーボン:海草や陸上由来の炭素は海底に貯留されやすい
  • URL: http://www.pari.go.jp/unit/ekanky/member/kuwae/bluecarbon_selective_storage.html
• [Remarks] アマモは海中からだけでなく大気中のCO2も直接吸収している
  • URL: http://www.pari.go.jp/unit/ekanky/member/kuwae/assimilation_of_atmospheric_co2_by_seagrasses.html
• [Remarks] ブルーカーボン:海草場は大気中CO2を正味で吸収している
  • URL: http://www.pari.go.jp/unit/ekanky/member/kuwae/bluecarbon_co2sink.html
• [Remarks] seagrass as a direct sink for atmospheric CO2
  • URL: http://www.pari.go.jp/unit/ekanky/en/member/kuwae/blue_carbon_sink.html
• [Remarks] seagrass function as carbon sequestration filters
  • URL: http://www.pari.go.jp/unit/ekanky/en/member/watanabe/carbon_sequestration.html
• [Remarks] ルーカーボン:海草や陸上由来の炭素は海底に貯留されやすい
  • URL: http://www.pari.go.jp/unit/ekanky/member/kuwae/bluecarbon_selective_storage.html
• [Remarks] ブルーカーボン:海草場はCO2を大気から吸収している
  • URL: http://www.pari.go.jp/unit/ekanky/member/kuwae/bluecarbon_co2sink.html