Quantitative evaluation of effect of subsurface warming on production and consumption of greenhouse gases

• Project/Area Number: 26889015
• Research Category: Grant-in-Aid for Research Activity Start-up
• Allocation Type: Single-year Grants
• Research Field: Geotechnical engineering
• Research Institution: Saitama University
• Principal Investigator: SAITO Takeshi 埼玉大学, 理工学研究科, 助教 (30735668)
• Project Period (FY): 2014-08-29 – 2016-03-31
• Project Status: Completed (Fiscal Year 2015)
• Budget Amount: ¥2,730,000 (Direct Cost: ¥2,100,000、Indirect Cost: ¥630,000); Fiscal Year 2015: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000); Fiscal Year 2014: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
• Keywords: 地下温暖化 / 温室効果ガス / 二酸化炭素 / フラックス / 定量的評価

Outline of Final Research Achievements

The objective of this study was to evaluate quantitatively effect of subsurface temperature increase on production and consumption of carbon dioxide (CO2) as one of greenhouse gases. The CO2 fluxes from soil surface and in soil were monitored by using combined techniques of a closed-chamber method and measurement of soil gas concentration in the unsaturated zone with laboratory experiment of gas diffusivity for soil core samples. Results show that approximately 90% of the soil surface CO2 flux was produced at the shallow part of soil. The CO2 flux might also have a moderate positive correlation with the subsurface temperature near the soil surface.

Research Products

• [Journal Article] Temperature change affected groundwater quality in a confined marine aquifer during long-term heating and cooling (2016)
  • Author(s): Takeshi Saito, Shoichiro Hamamoto, Takashi Ueki, Satoshi Ohkubo, Per Moldrup, Ken Kawamoto, Toshiko Komatsu
  • Journal Title: Water Research Volume: 94 Pages: 120-127
  • DOI: 10.1016/j.watres.2016.01.043
  • Peer Reviewed / Open Access / Int'l Joint Research / Acknowledgement Compliant
• [Journal Article] In-situ thermal disturbance affected groundwater quality in a marine sediment aquifer (Saitama, Japan) (2015)
  • Author(s): Takeshi Saito, Takashi Ueki, Satoshi Ohkubo, Shoichiro Hamamoto, Ken Kawamoto, Per Moldrup, Toshiko Komatsu
  • Journal Title: Proceedings of the Third International Symposium on Advances in Civil and Environmental Engineering Practices for Sustainable Development Volume: なし Pages: 201-205
  • Peer Reviewed / Acknowledgement Compliant
• [Presentation] 長期的な地下温度変化が地下水質に与える影響の定量的評価 (2016)
  • Author(s): 斎藤健志・上島雅人・川本健・小松登志子
  • Organizer: 第50回日本水環境学会年会（2015年度）
  • Place of Presentation: アスティとくしま（徳島県徳島市）
  • Year and Date: 2016-03-16
• [Presentation] In-situ thermal disturbance affected groundwater quality in a marine sediment aquifer (Saitama, Japan) (2015)
  • Author(s): Takeshi Saito, Takashi Ueki, Satoshi Ohkubo, Shoichiro Hamamoto, Ken Kawamoto, Per Moldrup, Toshiko Komatsu
  • Organizer: Third International Symposium on Advances in Civil and Environmental Engineering Practices for Sustainable Development
  • Place of Presentation: Galle, Sri Lanka
  • Year and Date: 2015-03-09